[iOS] Software keyboard is shown too frequently on some websites
[WebKit-https.git] / Source / WebKit / UIProcess / API / Cocoa / WKWebView.mm
1 /*
2  * Copyright (C) 2014-2018 Apple Inc. All rights reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions
6  * are met:
7  * 1. Redistributions of source code must retain the above copyright
8  *    notice, this list of conditions and the following disclaimer.
9  * 2. Redistributions in binary form must reproduce the above copyright
10  *    notice, this list of conditions and the following disclaimer in the
11  *    documentation and/or other materials provided with the distribution.
12  *
13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23  * THE POSSIBILITY OF SUCH DAMAGE.
24  */
25
26 #import "config.h"
27 #import "WKWebViewInternal.h"
28
29 #import "APIFormClient.h"
30 #import "APIPageConfiguration.h"
31 #import "APISerializedScriptValue.h"
32 #import "AttributedString.h"
33 #import "CompletionHandlerCallChecker.h"
34 #import "DiagnosticLoggingClient.h"
35 #import "DynamicViewportSizeUpdate.h"
36 #import "FindClient.h"
37 #import "FrontBoardServicesSPI.h"
38 #import "FullscreenClient.h"
39 #import "GlobalFindInPageState.h"
40 #import "IconLoadingDelegate.h"
41 #import "LegacySessionStateCoding.h"
42 #import "Logging.h"
43 #import "MediaCaptureUtilities.h"
44 #import "NavigationState.h"
45 #import "ObjCObjectGraph.h"
46 #import "PageClient.h"
47 #import "ProvisionalPageProxy.h"
48 #import "RemoteLayerTreeScrollingPerformanceData.h"
49 #import "RemoteLayerTreeTransaction.h"
50 #import "RemoteObjectRegistry.h"
51 #import "RemoteObjectRegistryMessages.h"
52 #import "SafeBrowsingWarning.h"
53 #import "TextInputContext.h"
54 #import "UIDelegate.h"
55 #import "UserMediaProcessManager.h"
56 #import "VersionChecks.h"
57 #import "ViewGestureController.h"
58 #import "ViewSnapshotStore.h"
59 #import "WKBackForwardListInternal.h"
60 #import "WKBackForwardListItemInternal.h"
61 #import "WKBrowsingContextHandleInternal.h"
62 #import "WKDragDestinationAction.h"
63 #import "WKErrorInternal.h"
64 #import "WKHistoryDelegatePrivate.h"
65 #import "WKLayoutMode.h"
66 #import "WKNSData.h"
67 #import "WKNSURLExtras.h"
68 #import "WKNavigationDelegate.h"
69 #import "WKNavigationInternal.h"
70 #import "WKPreferencesInternal.h"
71 #import "WKProcessPoolInternal.h"
72 #import "WKSafeBrowsingWarning.h"
73 #import "WKSharedAPICast.h"
74 #import "WKSnapshotConfiguration.h"
75 #import "WKUIDelegate.h"
76 #import "WKUIDelegatePrivate.h"
77 #import "WKUserContentControllerInternal.h"
78 #import "WKWebViewConfigurationInternal.h"
79 #import "WKWebViewContentProvider.h"
80 #import "WKWebpagePreferencesInternal.h"
81 #import "WKWebsiteDataStoreInternal.h"
82 #import "WebBackForwardList.h"
83 #import "WebCertificateInfo.h"
84 #import "WebFullScreenManagerProxy.h"
85 #import "WebPageGroup.h"
86 #import "WebPageProxy.h"
87 #import "WebPreferencesKeys.h"
88 #import "WebProcessPool.h"
89 #import "WebProcessProxy.h"
90 #import "WebURLSchemeHandlerCocoa.h"
91 #import "WebViewImpl.h"
92 #import "_WKActivatedElementInfoInternal.h"
93 #import "_WKDiagnosticLoggingDelegate.h"
94 #import "_WKFindDelegate.h"
95 #import "_WKFrameHandleInternal.h"
96 #import "_WKFullscreenDelegate.h"
97 #import "_WKHitTestResultInternal.h"
98 #import "_WKInputDelegate.h"
99 #import "_WKInspectorInternal.h"
100 #import "_WKRemoteObjectRegistryInternal.h"
101 #import "_WKSessionStateInternal.h"
102 #import "_WKTextInputContextInternal.h"
103 #import "_WKVisitedLinkStoreInternal.h"
104 #import "_WKWebsitePoliciesInternal.h"
105 #import <WebCore/GraphicsContextCG.h>
106 #import <WebCore/IOSurface.h>
107 #import <WebCore/JSDOMBinding.h>
108 #import <WebCore/JSDOMExceptionHandling.h>
109 #import <WebCore/MIMETypeRegistry.h>
110 #import <WebCore/PlatformScreen.h>
111 #import <WebCore/RuntimeApplicationChecks.h>
112 #import <WebCore/SQLiteDatabaseTracker.h>
113 #import <WebCore/SchemeRegistry.h>
114 #import <WebCore/Settings.h>
115 #import <WebCore/SharedBuffer.h>
116 #import <WebCore/StringUtilities.h>
117 #import <WebCore/ValidationBubble.h>
118 #import <WebCore/ViewportArguments.h>
119 #import <WebCore/WritingMode.h>
120 #import <pal/spi/cocoa/NSKeyedArchiverSPI.h>
121 #import <pal/spi/mac/NSTextFinderSPI.h>
122 #import <wtf/BlockPtr.h>
123 #import <wtf/HashMap.h>
124 #import <wtf/MathExtras.h>
125 #import <wtf/NeverDestroyed.h>
126 #import <wtf/Optional.h>
127 #import <wtf/RetainPtr.h>
128 #import <wtf/SetForScope.h>
129 #import <wtf/UUID.h>
130 #import <wtf/spi/darwin/dyldSPI.h>
131 #import <wtf/text/TextStream.h>
132
133 #if ENABLE(APPLICATION_MANIFEST)
134 #import "_WKApplicationManifestInternal.h"
135 #endif
136
137 #if ENABLE(DATA_DETECTION)
138 #import "WKDataDetectorTypesInternal.h"
139 #endif
140
141 #if PLATFORM(IOS_FAMILY)
142 #import "InteractionInformationAtPosition.h"
143 #import "InteractionInformationRequest.h"
144 #import "ProcessThrottler.h"
145 #import "RemoteLayerTreeDrawingAreaProxy.h"
146 #import "RemoteScrollingCoordinatorProxy.h"
147 #import "UIKitSPI.h"
148 #import "VideoFullscreenManagerProxy.h"
149 #import "WKContentViewInteraction.h"
150 #import "WKPasswordView.h"
151 #import "WKScrollView.h"
152 #import "WKWebViewContentProviderRegistry.h"
153 #import "_WKWebViewPrintFormatter.h"
154 #import <MobileCoreServices/MobileCoreServices.h>
155 #import <UIKit/UIApplication.h>
156 #import <WebCore/FrameLoaderTypes.h>
157 #import <WebCore/InspectorOverlay.h>
158 #import <WebCore/ScrollableArea.h>
159 #import <WebCore/WebBackgroundTaskController.h>
160 #import <WebCore/WebSQLiteDatabaseTrackerClient.h>
161 #import <pal/spi/cg/CoreGraphicsSPI.h>
162 #import <pal/spi/cocoa/QuartzCoreSPI.h>
163 #import <pal/spi/ios/GraphicsServicesSPI.h>
164 #import <wtf/cocoa/Entitlements.h>
165
166 #define RELEASE_LOG_IF_ALLOWED(...) RELEASE_LOG_IF(_page && _page->isAlwaysOnLoggingAllowed(), ViewState, __VA_ARGS__)
167
168 @interface UIView (UIViewInternal)
169 - (UIViewController *)_viewControllerForAncestor;
170 @end
171
172 @interface UIWindow (UIWindowInternal)
173 - (BOOL)_isHostedInAnotherProcess;
174 @end
175
176 @interface UIViewController (UIViewControllerInternal)
177 - (UIViewController *)_rootAncestorViewController;
178 - (UIViewController *)_viewControllerForSupportedInterfaceOrientations;
179 @end
180
181 #endif // PLATFORM(IOS_FAMILY)
182
183 #if PLATFORM(IOS_FAMILY)
184 static const uint32_t firstSDKVersionWithLinkPreviewEnabledByDefault = 0xA0000;
185 static const Seconds delayBeforeNoVisibleContentsRectsLogging = 1_s;
186 #endif
187
188 #if PLATFORM(MAC)
189 #import "AppKitSPI.h"
190 #import "WKTextFinderClient.h"
191 #import "WKViewInternal.h"
192 #import <WebCore/ColorMac.h>
193
194 @interface WKWebView () <WebViewImplDelegate, NSTextInputClient, NSTextInputClient_Async>
195 @end
196
197 #if HAVE(TOUCH_BAR)
198 @interface WKWebView () <NSTouchBarProvider>
199 @end
200 #endif // HAVE(TOUCH_BAR)
201 #endif // PLATFORM(MAC)
202
203 #if ENABLE(ACCESSIBILITY_EVENTS)
204 #import "AccessibilitySupportSPI.h"
205 #import <wtf/darwin/WeakLinking.h>
206 #endif
207
208 #if PLATFORM(MAC) && ENABLE(DRAG_SUPPORT)
209
210 @interface WKWebView () <NSFilePromiseProviderDelegate, NSDraggingSource>
211 @end
212
213 #endif
214
215 static HashMap<WebKit::WebPageProxy*, __unsafe_unretained WKWebView *>& pageToViewMap()
216 {
217     static NeverDestroyed<HashMap<WebKit::WebPageProxy*, __unsafe_unretained WKWebView *>> map;
218     return map;
219 }
220
221 WKWebView* fromWebPageProxy(WebKit::WebPageProxy& page)
222 {
223     return pageToViewMap().get(&page);
224 }
225
226 #if PLATFORM(MAC)
227 static _WKOverlayScrollbarStyle toAPIScrollbarStyle(Optional<WebCore::ScrollbarOverlayStyle> coreScrollbarStyle)
228 {
229     if (!coreScrollbarStyle)
230         return _WKOverlayScrollbarStyleAutomatic;
231     
232     switch (coreScrollbarStyle.value()) {
233     case WebCore::ScrollbarOverlayStyleDark:
234         return _WKOverlayScrollbarStyleDark;
235     case WebCore::ScrollbarOverlayStyleLight:
236         return _WKOverlayScrollbarStyleLight;
237     case WebCore::ScrollbarOverlayStyleDefault:
238         return _WKOverlayScrollbarStyleDefault;
239     }
240     ASSERT_NOT_REACHED();
241     return _WKOverlayScrollbarStyleAutomatic;
242 }
243
244 static Optional<WebCore::ScrollbarOverlayStyle> toCoreScrollbarStyle(_WKOverlayScrollbarStyle scrollbarStyle)
245 {
246     switch (scrollbarStyle) {
247     case _WKOverlayScrollbarStyleDark:
248         return WebCore::ScrollbarOverlayStyleDark;
249     case _WKOverlayScrollbarStyleLight:
250         return WebCore::ScrollbarOverlayStyleLight;
251     case _WKOverlayScrollbarStyleDefault:
252         return WebCore::ScrollbarOverlayStyleDefault;
253     case _WKOverlayScrollbarStyleAutomatic:
254         break;
255     }
256     return WTF::nullopt;
257 }
258 #endif
259
260 #define FORWARD_ACTION_TO_WKCONTENTVIEW(_action) \
261     - (void)_action:(id)sender \
262     { \
263         if (self.usesStandardContentView) \
264             [_contentView _action ## ForWebView:sender]; \
265     }
266
267 @implementation WKWebView {
268     std::unique_ptr<WebKit::NavigationState> _navigationState;
269     std::unique_ptr<WebKit::UIDelegate> _uiDelegate;
270     std::unique_ptr<WebKit::IconLoadingDelegate> _iconLoadingDelegate;
271
272     _WKRenderingProgressEvents _observedRenderingProgressEvents;
273
274     WeakObjCPtr<id <_WKInputDelegate>> _inputDelegate;
275
276     Optional<BOOL> _resolutionForShareSheetImmediateCompletionForTesting;
277     RetainPtr<WKSafeBrowsingWarning> _safeBrowsingWarning;
278
279 #if PLATFORM(IOS_FAMILY)
280     RetainPtr<_WKRemoteObjectRegistry> _remoteObjectRegistry;
281
282     RetainPtr<WKScrollView> _scrollView;
283     RetainPtr<WKContentView> _contentView;
284
285 #if ENABLE(FULLSCREEN_API)
286     RetainPtr<WKFullScreenWindowController> _fullScreenWindowController;
287 #endif
288
289     BOOL _overridesViewLayoutSize;
290     CGSize _viewLayoutSizeOverride;
291     Optional<WebCore::FloatSize> _lastSentViewLayoutSize;
292     BOOL _overridesMaximumUnobscuredSize;
293     CGSize _maximumUnobscuredSizeOverride;
294     Optional<WebCore::FloatSize> _lastSentMaximumUnobscuredSize;
295     CGRect _inputViewBounds;
296     CGFloat _viewportMetaTagWidth;
297     BOOL _viewportMetaTagWidthWasExplicit;
298     BOOL _viewportMetaTagCameFromImageDocument;
299     CGFloat _initialScaleFactor;
300     BOOL _fastClickingIsDisabled;
301
302     BOOL _allowsLinkPreview;
303
304     UIEdgeInsets _obscuredInsets;
305     BOOL _haveSetObscuredInsets;
306     BOOL _isChangingObscuredInsetsInteractively;
307
308     UIEdgeInsets _unobscuredSafeAreaInsets;
309     BOOL _haveSetUnobscuredSafeAreaInsets;
310     BOOL _avoidsUnsafeArea;
311     UIRectEdge _obscuredInsetEdgesAffectedBySafeArea;
312
313     UIInterfaceOrientation _interfaceOrientationOverride;
314     BOOL _overridesInterfaceOrientation;
315     Optional<int32_t> _lastSentDeviceOrientation;
316
317     BOOL _allowsViewportShrinkToFit;
318
319     BOOL _hasCommittedLoadForMainFrame;
320     BOOL _needsResetViewStateAfterCommitLoadForMainFrame;
321     uint64_t _firstPaintAfterCommitLoadTransactionID;
322     WebKit::DynamicViewportUpdateMode _dynamicViewportUpdateMode;
323     WebKit::DynamicViewportSizeUpdateID _currentDynamicViewportSizeUpdateID;
324     CATransform3D _resizeAnimationTransformAdjustments;
325     CGFloat _animatedResizeOriginalContentWidth;
326     RetainPtr<UIView> _resizeAnimationView;
327     CGFloat _lastAdjustmentForScroller;
328     Optional<CGRect> _frozenVisibleContentRect;
329     Optional<CGRect> _frozenUnobscuredContentRect;
330
331     BOOL _commitDidRestoreScrollPosition;
332     Optional<WebCore::FloatPoint> _scrollOffsetToRestore;
333     WebCore::FloatBoxExtent _obscuredInsetsWhenSaved;
334
335     Optional<WebCore::FloatPoint> _unobscuredCenterToRestore;
336     Optional<uint64_t> _firstTransactionIDAfterPageRestore;
337     double _scaleToRestore;
338
339     std::unique_ptr<WebKit::ViewGestureController> _gestureController;
340     BOOL _allowsBackForwardNavigationGestures;
341
342     RetainPtr<UIView <WKWebViewContentProvider>> _customContentView;
343     RetainPtr<UIView> _customContentFixedOverlayView;
344
345     RetainPtr<NSTimer> _enclosingScrollViewScrollTimer;
346     BOOL _didScrollSinceLastTimerFire;
347
348     WebCore::Color _scrollViewBackgroundColor;
349
350     // This value tracks the current adjustment added to the bottom inset due to the keyboard sliding out from the bottom
351     // when computing obscured content insets. This is used when updating the visible content rects where we should not
352     // include this adjustment.
353     CGFloat _totalScrollViewBottomInsetAdjustmentForKeyboard;
354     BOOL _currentlyAdjustingScrollViewInsetsForKeyboard;
355
356     BOOL _delayUpdateVisibleContentRects;
357     BOOL _hadDelayedUpdateVisibleContentRects;
358
359     BOOL _waitingForEndAnimatedResize;
360     BOOL _waitingForCommitAfterAnimatedResize;
361
362     Vector<WTF::Function<void ()>> _callbacksDeferredDuringResize;
363     RetainPtr<NSMutableArray> _stableStatePresentationUpdateCallbacks;
364
365     RetainPtr<WKPasswordView> _passwordView;
366
367     BOOL _hasScheduledVisibleRectUpdate;
368     BOOL _visibleContentRectUpdateScheduledFromScrollViewInStableState;
369     Vector<BlockPtr<void ()>> _visibleContentRectUpdateCallbacks;
370
371     _WKDragInteractionPolicy _dragInteractionPolicy;
372
373     // For release-logging for <rdar://problem/39281269>.
374     MonotonicTime _timeOfRequestForVisibleContentRectUpdate;
375     MonotonicTime _timeOfLastVisibleContentRectUpdate;
376
377     NSUInteger _focusPreservationCount;
378     NSUInteger _activeFocusedStateRetainCount;
379 #endif
380 #if PLATFORM(MAC)
381     std::unique_ptr<WebKit::WebViewImpl> _impl;
382     RetainPtr<WKTextFinderClient> _textFinderClient;
383 #endif
384     _WKSelectionAttributes _selectionAttributes;
385 }
386
387 - (instancetype)initWithFrame:(CGRect)frame
388 {
389     return [self initWithFrame:frame configuration:adoptNS([[WKWebViewConfiguration alloc] init]).get()];
390 }
391
392 - (BOOL)_isValid
393 {
394     return _page && _page->hasRunningProcess();
395 }
396
397 #if PLATFORM(IOS_FAMILY)
398 static int32_t deviceOrientationForUIInterfaceOrientation(UIInterfaceOrientation orientation)
399 {
400     switch (orientation) {
401     case UIInterfaceOrientationUnknown:
402     case UIInterfaceOrientationPortrait:
403         return 0;
404     case UIInterfaceOrientationPortraitUpsideDown:
405         return 180;
406     case UIInterfaceOrientationLandscapeLeft:
407         return -90;
408     case UIInterfaceOrientationLandscapeRight:
409         return 90;
410     }
411 }
412
413 static int32_t deviceOrientation()
414 {
415     return deviceOrientationForUIInterfaceOrientation([[UIApplication sharedApplication] statusBarOrientation]);
416 }
417
418 - (BOOL)_isShowingVideoPictureInPicture
419 {
420 #if !HAVE(AVKIT)
421     return false;
422 #else
423     if (!_page || !_page->videoFullscreenManager())
424         return false;
425
426     return _page->videoFullscreenManager()->hasMode(WebCore::HTMLMediaElementEnums::VideoFullscreenModePictureInPicture);
427 #endif
428 }
429
430 - (BOOL)_mayAutomaticallyShowVideoPictureInPicture
431 {
432 #if !HAVE(AVKIT)
433     return false;
434 #else
435     if (!_page || !_page->videoFullscreenManager())
436         return false;
437
438     return _page->videoFullscreenManager()->mayAutomaticallyShowVideoPictureInPicture();
439 #endif
440 }
441
442 static bool shouldAllowPictureInPictureMediaPlayback()
443 {
444     static bool shouldAllowPictureInPictureMediaPlayback = dyld_get_program_sdk_version() >= DYLD_IOS_VERSION_9_0;
445     return shouldAllowPictureInPictureMediaPlayback;
446 }
447
448 static bool shouldAllowSettingAnyXHRHeaderFromFileURLs()
449 {
450     static bool shouldAllowSettingAnyXHRHeaderFromFileURLs = (WebCore::IOSApplication::isCardiogram() || WebCore::IOSApplication::isNike()) && !linkedOnOrAfter(WebKit::SDKVersion::FirstThatDisallowsSettingAnyXHRHeaderFromFileURLs);
451     return shouldAllowSettingAnyXHRHeaderFromFileURLs;
452 }
453
454 - (void)_incrementFocusPreservationCount
455 {
456     ++_focusPreservationCount;
457 }
458
459 - (void)_decrementFocusPreservationCount
460 {
461     if (_focusPreservationCount)
462         --_focusPreservationCount;
463 }
464
465 - (void)_resetFocusPreservationCount
466 {
467     _focusPreservationCount = 0;
468 }
469
470 - (BOOL)_isRetainingActiveFocusedState
471 {
472     // Focus preservation count fulfills the same role as active focus state count.
473     // However, unlike active focus state, it may be reset to 0 without impacting the
474     // behavior of -_retainActiveFocusedState, and it's harmless to invoke
475     // -_decrementFocusPreservationCount after resetting the count to 0.
476     return _focusPreservationCount || _activeFocusedStateRetainCount;
477 }
478
479 #endif
480
481 #if USE(APPLE_INTERNAL_SDK)
482 #include <WebKitAdditions/WKWebViewInternalAdditions.mm>
483 #endif
484
485 static bool shouldRequireUserGestureToLoadVideo()
486 {
487 #if PLATFORM(IOS_FAMILY)
488     static bool shouldRequireUserGestureToLoadVideo = dyld_get_program_sdk_version() >= DYLD_IOS_VERSION_10_0;
489     return shouldRequireUserGestureToLoadVideo;
490 #else
491     return false;
492 #endif
493 }
494
495 #if PLATFORM(MAC)
496 static uint32_t convertUserInterfaceDirectionPolicy(WKUserInterfaceDirectionPolicy policy)
497 {
498     switch (policy) {
499     case WKUserInterfaceDirectionPolicyContent:
500         return static_cast<uint32_t>(WebCore::UserInterfaceDirectionPolicy::Content);
501     case WKUserInterfaceDirectionPolicySystem:
502         return static_cast<uint32_t>(WebCore::UserInterfaceDirectionPolicy::System);
503     }
504     return static_cast<uint32_t>(WebCore::UserInterfaceDirectionPolicy::Content);
505 }
506
507 static uint32_t convertSystemLayoutDirection(NSUserInterfaceLayoutDirection direction)
508 {
509     switch (direction) {
510     case NSUserInterfaceLayoutDirectionLeftToRight:
511         return static_cast<uint32_t>(WebCore::UserInterfaceLayoutDirection::LTR);
512     case NSUserInterfaceLayoutDirectionRightToLeft:
513         return static_cast<uint32_t>(WebCore::UserInterfaceLayoutDirection::RTL);
514     }
515     return static_cast<uint32_t>(WebCore::UserInterfaceLayoutDirection::LTR);
516 }
517
518 #endif // PLATFORM(MAC)
519
520 static void validate(WKWebViewConfiguration *configuration)
521 {
522     if (!configuration.processPool)
523         [NSException raise:NSInvalidArgumentException format:@"configuration.processPool is nil"];
524     
525     if (!configuration.preferences)
526         [NSException raise:NSInvalidArgumentException format:@"configuration.preferences is nil"];
527     
528     if (!configuration.userContentController)
529         [NSException raise:NSInvalidArgumentException format:@"configuration.userContentController is nil"];
530     
531     if (!configuration.websiteDataStore)
532         [NSException raise:NSInvalidArgumentException format:@"configuration.websiteDataStore is nil"];
533     
534     if (!configuration._visitedLinkStore)
535         [NSException raise:NSInvalidArgumentException format:@"configuration._visitedLinkStore is nil"];
536     
537 #if PLATFORM(IOS_FAMILY)
538     if (!configuration._contentProviderRegistry)
539         [NSException raise:NSInvalidArgumentException format:@"configuration._contentProviderRegistry is nil"];
540 #endif
541 }
542
543 - (void)_initializeWithConfiguration:(WKWebViewConfiguration *)configuration
544 {
545     if (!configuration)
546         [NSException raise:NSInvalidArgumentException format:@"Configuration cannot be nil"];
547
548     _configuration = adoptNS([configuration copy]);
549
550     if (WKWebView *relatedWebView = [_configuration _relatedWebView]) {
551         WKProcessPool *processPool = [_configuration processPool];
552         WKProcessPool *relatedWebViewProcessPool = [relatedWebView->_configuration processPool];
553         if (processPool && processPool != relatedWebViewProcessPool)
554             [NSException raise:NSInvalidArgumentException format:@"Related web view %@ has process pool %@ but configuration specifies a different process pool %@", relatedWebView, relatedWebViewProcessPool, configuration.processPool];
555         if ([relatedWebView->_configuration websiteDataStore] != [_configuration websiteDataStore] && linkedOnOrAfter(WebKit::SDKVersion::FirstWithExceptionsForRelatedWebViewsUsingDifferentDataStores, WebKit::AssumeSafariIsAlwaysLinkedOnAfter::No))
556             [NSException raise:NSInvalidArgumentException format:@"Related web view %@ has data store %@ but configuration specifies a different data store %@", relatedWebView, [relatedWebView->_configuration websiteDataStore], [_configuration websiteDataStore]];
557
558         [_configuration setProcessPool:relatedWebViewProcessPool];
559     }
560
561     validate(_configuration.get());
562
563     WebKit::WebProcessPool& processPool = *[_configuration processPool]->_processPool;
564     processPool.setResourceLoadStatisticsEnabled(configuration.websiteDataStore._resourceLoadStatisticsEnabled);
565
566     auto pageConfiguration = [configuration copyPageConfiguration];
567
568     pageConfiguration->setProcessPool(&processPool);
569     pageConfiguration->setPreferences([_configuration preferences]->_preferences.get());
570     if (WKWebView *relatedWebView = [_configuration _relatedWebView])
571         pageConfiguration->setRelatedPage(relatedWebView->_page.get());
572
573     pageConfiguration->setUserContentController([_configuration userContentController]->_userContentControllerProxy.get());
574     pageConfiguration->setVisitedLinkStore([_configuration _visitedLinkStore]->_visitedLinkStore.get());
575     pageConfiguration->setWebsiteDataStore([_configuration websiteDataStore]->_websiteDataStore.get());
576     pageConfiguration->setDefaultWebsitePolicies([_configuration defaultWebpagePreferences]->_websitePolicies.get());
577
578 #if PLATFORM(MAC)
579     if (auto pageGroup = WebKit::toImpl([configuration _pageGroup])) {
580         pageConfiguration->setPageGroup(pageGroup);
581         pageConfiguration->setUserContentController(&pageGroup->userContentController());
582     } else
583 #endif
584     {
585         NSString *groupIdentifier = configuration._groupIdentifier;
586         if (groupIdentifier.length)
587             pageConfiguration->setPageGroup(WebKit::WebPageGroup::create(configuration._groupIdentifier).ptr());
588     }
589
590     pageConfiguration->setAdditionalSupportedImageTypes(WebCore::webCoreStringVectorFromNSStringArray([_configuration _additionalSupportedImageTypes]));
591
592     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::suppressesIncrementalRenderingKey(), WebKit::WebPreferencesStore::Value(!![_configuration suppressesIncrementalRendering]));
593
594     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::shouldRespectImageOrientationKey(), WebKit::WebPreferencesStore::Value(!![_configuration _respectsImageOrientation]));
595 #if !PLATFORM(MAC)
596     // FIXME: Expose WKPreferences._shouldPrintBackgrounds on iOS, adopt it in all iOS clients, and remove this and WKWebViewConfiguration._printsBackgrounds.
597     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::shouldPrintBackgroundsKey(), WebKit::WebPreferencesStore::Value(!![_configuration _printsBackgrounds]));
598 #endif
599     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::incrementalRenderingSuppressionTimeoutKey(), WebKit::WebPreferencesStore::Value([_configuration _incrementalRenderingSuppressionTimeout]));
600     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::javaScriptMarkupEnabledKey(), WebKit::WebPreferencesStore::Value(!![_configuration _allowsJavaScriptMarkup]));
601     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::shouldConvertPositionStyleOnCopyKey(), WebKit::WebPreferencesStore::Value(!![_configuration _convertsPositionStyleOnCopy]));
602     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::httpEquivEnabledKey(), WebKit::WebPreferencesStore::Value(!![_configuration _allowsMetaRefresh]));
603     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::allowUniversalAccessFromFileURLsKey(), WebKit::WebPreferencesStore::Value(!![_configuration _allowUniversalAccessFromFileURLs]));
604     pageConfiguration->setWaitsForPaintAfterViewDidMoveToWindow([_configuration _waitsForPaintAfterViewDidMoveToWindow]);
605     pageConfiguration->setDrawsBackground([_configuration _drawsBackground]);
606     pageConfiguration->setControlledByAutomation([_configuration _isControlledByAutomation]);
607     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::incompleteImageBorderEnabledKey(), WebKit::WebPreferencesStore::Value(!![_configuration _incompleteImageBorderEnabled]));
608     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::shouldDeferAsynchronousScriptsUntilAfterDocumentLoadKey(), WebKit::WebPreferencesStore::Value(!![_configuration _shouldDeferAsynchronousScriptsUntilAfterDocumentLoad]));
609
610 #if PLATFORM(MAC)
611     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::showsURLsInToolTipsEnabledKey(), WebKit::WebPreferencesStore::Value(!![_configuration _showsURLsInToolTips]));
612     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::serviceControlsEnabledKey(), WebKit::WebPreferencesStore::Value(!![_configuration _serviceControlsEnabled]));
613     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::imageControlsEnabledKey(), WebKit::WebPreferencesStore::Value(!![_configuration _imageControlsEnabled]));
614
615     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::userInterfaceDirectionPolicyKey(), WebKit::WebPreferencesStore::Value(convertUserInterfaceDirectionPolicy([_configuration userInterfaceDirectionPolicy])));
616     // We are in the View's initialization routine, so our client hasn't had time to set our user interface direction.
617     // Therefore, according to the docs[1], "this property contains the value reported by the app's userInterfaceLayoutDirection property."
618     // [1] http://developer.apple.com/library/mac/documentation/Cocoa/Reference/ApplicationKit/Classes/NSView_Class/index.html#//apple_ref/doc/uid/20000014-SW222
619     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::systemLayoutDirectionKey(), WebKit::WebPreferencesStore::Value(convertSystemLayoutDirection(self.userInterfaceLayoutDirection)));
620 #endif
621
622 #if PLATFORM(IOS_FAMILY)
623     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::allowsInlineMediaPlaybackKey(), WebKit::WebPreferencesStore::Value(!![_configuration allowsInlineMediaPlayback]));
624     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::allowsInlineMediaPlaybackAfterFullscreenKey(), WebKit::WebPreferencesStore::Value(!![_configuration _allowsInlineMediaPlaybackAfterFullscreen]));
625     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::inlineMediaPlaybackRequiresPlaysInlineAttributeKey(), WebKit::WebPreferencesStore::Value(!![_configuration _inlineMediaPlaybackRequiresPlaysInlineAttribute]));
626     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::allowsPictureInPictureMediaPlaybackKey(), WebKit::WebPreferencesStore::Value(!![_configuration allowsPictureInPictureMediaPlayback] && shouldAllowPictureInPictureMediaPlayback()));
627     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::userInterfaceDirectionPolicyKey(), WebKit::WebPreferencesStore::Value(static_cast<uint32_t>(WebCore::UserInterfaceDirectionPolicy::Content)));
628     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::systemLayoutDirectionKey(), WebKit::WebPreferencesStore::Value(static_cast<uint32_t>(WebCore::TextDirection::LTR)));
629     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::allowSettingAnyXHRHeaderFromFileURLsKey(), WebKit::WebPreferencesStore::Value(shouldAllowSettingAnyXHRHeaderFromFileURLs()));
630     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::shouldDecidePolicyBeforeLoadingQuickLookPreviewKey(), WebKit::WebPreferencesStore::Value(!![_configuration _shouldDecidePolicyBeforeLoadingQuickLookPreview]));
631 #if ENABLE(DEVICE_ORIENTATION)
632     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::deviceOrientationPermissionAPIEnabledKey(), WebKit::WebPreferencesStore::Value(linkedOnOrAfter(WebKit::SDKVersion::FirstWithDeviceOrientationAndMotionPermissionAPI)));
633 #endif
634 #if USE(SYSTEM_PREVIEW)
635     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::systemPreviewEnabledKey(), WebKit::WebPreferencesStore::Value(!![_configuration _systemPreviewEnabled]));
636 #endif
637 #endif
638
639     WKAudiovisualMediaTypes mediaTypesRequiringUserGesture = [_configuration mediaTypesRequiringUserActionForPlayback];
640     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::requiresUserGestureForVideoPlaybackKey(), WebKit::WebPreferencesStore::Value((mediaTypesRequiringUserGesture & WKAudiovisualMediaTypeVideo) == WKAudiovisualMediaTypeVideo));
641     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::requiresUserGestureForAudioPlaybackKey(), WebKit::WebPreferencesStore::Value(((mediaTypesRequiringUserGesture & WKAudiovisualMediaTypeAudio) == WKAudiovisualMediaTypeAudio)));
642     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::requiresUserGestureToLoadVideoKey(), WebKit::WebPreferencesStore::Value(shouldRequireUserGestureToLoadVideo()));
643     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::mainContentUserGestureOverrideEnabledKey(), WebKit::WebPreferencesStore::Value(!![_configuration _mainContentUserGestureOverrideEnabled]));
644     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::invisibleAutoplayNotPermittedKey(), WebKit::WebPreferencesStore::Value(!![_configuration _invisibleAutoplayNotPermitted]));
645     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::mediaDataLoadsAutomaticallyKey(), WebKit::WebPreferencesStore::Value(!![_configuration _mediaDataLoadsAutomatically]));
646     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::attachmentElementEnabledKey(), WebKit::WebPreferencesStore::Value(!![_configuration _attachmentElementEnabled]));
647
648 #if ENABLE(DATA_DETECTION) && PLATFORM(IOS_FAMILY)
649     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::dataDetectorTypesKey(), WebKit::WebPreferencesStore::Value(static_cast<uint32_t>(fromWKDataDetectorTypes([_configuration dataDetectorTypes]))));
650 #endif
651 #if ENABLE(WIRELESS_PLAYBACK_TARGET)
652     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::allowsAirPlayForMediaPlaybackKey(), WebKit::WebPreferencesStore::Value(!![_configuration allowsAirPlayForMediaPlayback]));
653 #endif
654
655 #if ENABLE(APPLE_PAY)
656     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::applePayEnabledKey(), WebKit::WebPreferencesStore::Value(!![_configuration _applePayEnabled]));
657 #endif
658
659     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::needsStorageAccessFromFileURLsQuirkKey(), WebKit::WebPreferencesStore::Value(!![_configuration _needsStorageAccessFromFileURLsQuirk]));
660     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::mediaContentTypesRequiringHardwareSupportKey(), WebKit::WebPreferencesStore::Value(String([_configuration _mediaContentTypesRequiringHardwareSupport])));
661     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::allowMediaContentTypesRequiringHardwareSupportAsFallbackKey(), WebKit::WebPreferencesStore::Value(!![_configuration _allowMediaContentTypesRequiringHardwareSupportAsFallback]));
662
663     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::colorFilterEnabledKey(), WebKit::WebPreferencesStore::Value(!![_configuration _colorFilterEnabled]));
664
665     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::editableImagesEnabledKey(), WebKit::WebPreferencesStore::Value(!![_configuration _editableImagesEnabled]));
666     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::undoManagerAPIEnabledKey(), WebKit::WebPreferencesStore::Value(!![_configuration _undoManagerAPIEnabled]));
667
668 #if ENABLE(LEGACY_ENCRYPTED_MEDIA)
669     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::legacyEncryptedMediaAPIEnabledKey(), WebKit::WebPreferencesStore::Value(!![_configuration _legacyEncryptedMediaAPIEnabled]));
670 #endif
671
672 #if PLATFORM(IOS_FAMILY) && ENABLE(SERVICE_WORKER)
673     if (!WTF::processHasEntitlement("com.apple.developer.WebKit.ServiceWorkers"))
674         pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::serviceWorkersEnabledKey(), WebKit::WebPreferencesStore::Value(false));
675 #endif
676
677 #if PLATFORM(IOS_FAMILY)
678     CGRect bounds = self.bounds;
679     _scrollView = adoptNS([[WKScrollView alloc] initWithFrame:bounds]);
680     [_scrollView setInternalDelegate:self];
681     [_scrollView setBouncesZoom:YES];
682
683     if ([_configuration _editableImagesEnabled])
684         [_scrollView panGestureRecognizer].allowedTouchTypes = @[ @(UITouchTypeDirect) ];
685
686     _avoidsUnsafeArea = YES;
687     [self _updateScrollViewInsetAdjustmentBehavior];
688
689     [self addSubview:_scrollView.get()];
690
691     static uint32_t programSDKVersion = dyld_get_program_sdk_version();
692     _allowsLinkPreview = programSDKVersion >= firstSDKVersionWithLinkPreviewEnabledByDefault;
693
694     _contentView = adoptNS([[WKContentView alloc] initWithFrame:bounds processPool:processPool configuration:pageConfiguration.copyRef() webView:self]);
695
696     _page = [_contentView page];
697     [self _dispatchSetDeviceOrientation:deviceOrientation()];
698     if (!self.opaque)
699         _page->setBackgroundColor(WebCore::Color(WebCore::Color::transparent));
700
701     [_contentView layer].anchorPoint = CGPointZero;
702     [_contentView setFrame:bounds];
703     [_scrollView addSubview:_contentView.get()];
704     [_scrollView addSubview:[_contentView unscaledView]];
705     [self _updateScrollViewBackground];
706     _obscuredInsetEdgesAffectedBySafeArea = UIRectEdgeTop | UIRectEdgeLeft | UIRectEdgeRight;
707
708     _viewportMetaTagWidth = WebCore::ViewportArguments::ValueAuto;
709     _initialScaleFactor = 1;
710
711     if (NSNumber *enabledValue = [[NSUserDefaults standardUserDefaults] objectForKey:@"WebKitFastClickingDisabled"])
712         _fastClickingIsDisabled = enabledValue.boolValue;
713     else {
714 #if PLATFORM(WATCHOS)
715         _fastClickingIsDisabled = YES;
716 #else
717         _fastClickingIsDisabled = NO;
718 #endif
719     }
720
721     [self _frameOrBoundsChanged];
722
723     NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
724     [center addObserver:self selector:@selector(_keyboardWillChangeFrame:) name:UIKeyboardWillChangeFrameNotification object:nil];
725     [center addObserver:self selector:@selector(_keyboardDidChangeFrame:) name:UIKeyboardDidChangeFrameNotification object:nil];
726     [center addObserver:self selector:@selector(_keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
727     [center addObserver:self selector:@selector(_keyboardDidShow:) name:UIKeyboardDidShowNotification object:nil];
728     [center addObserver:self selector:@selector(_keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
729     [center addObserver:self selector:@selector(_windowDidRotate:) name:UIWindowDidRotateNotification object:nil];
730     [center addObserver:self selector:@selector(_contentSizeCategoryDidChange:) name:UIContentSizeCategoryDidChangeNotification object:nil];
731     _page->contentSizeCategoryDidChange([self _contentSizeCategory]);
732
733     [center addObserver:self selector:@selector(_accessibilitySettingsDidChange:) name:UIAccessibilityGrayscaleStatusDidChangeNotification object:nil];
734     [center addObserver:self selector:@selector(_accessibilitySettingsDidChange:) name:UIAccessibilityInvertColorsStatusDidChangeNotification object:nil];
735     [center addObserver:self selector:@selector(_accessibilitySettingsDidChange:) name:UIAccessibilityReduceMotionStatusDidChangeNotification object:nil];
736
737     [[_configuration _contentProviderRegistry] addPage:*_page];
738     _page->setForceAlwaysUserScalable([_configuration ignoresViewportScaleLimits]);
739
740     CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(), (__bridge const void *)(self), hardwareKeyboardAvailabilityChangedCallback, (CFStringRef)[NSString stringWithUTF8String:kGSEventHardwareKeyboardAvailabilityChangedNotification], nullptr, CFNotificationSuspensionBehaviorCoalesce);
741 #endif
742
743 #if PLATFORM(MAC)
744     _impl = std::make_unique<WebKit::WebViewImpl>(self, self, processPool, pageConfiguration.copyRef());
745     _page = &_impl->page();
746
747     _impl->setAutomaticallyAdjustsContentInsets(true);
748     _impl->setRequiresUserActionForEditingControlsManager([configuration _requiresUserActionForEditingControlsManager]);
749 #endif
750
751 #if ENABLE(ACCESSIBILITY_EVENTS)
752     // Check _AXSWebAccessibilityEventsEnabled here to avoid compiler optimizing
753     // out the null check of kAXSWebAccessibilityEventsEnabledNotification.
754     if (!isNullFunctionPointer(_AXSWebAccessibilityEventsEnabled))
755         CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(), (__bridge const void *)(self), accessibilityEventsEnabledChangedCallback, kAXSWebAccessibilityEventsEnabledNotification, 0, CFNotificationSuspensionBehaviorDeliverImmediately);
756     [self _updateAccessibilityEventsEnabled];
757 #endif
758
759     if (NSString *applicationNameForUserAgent = configuration.applicationNameForUserAgent)
760         _page->setApplicationNameForUserAgent(applicationNameForUserAgent);
761
762     _navigationState = std::make_unique<WebKit::NavigationState>(self);
763     _page->setNavigationClient(_navigationState->createNavigationClient());
764
765     _uiDelegate = std::make_unique<WebKit::UIDelegate>(self);
766     _page->setFindClient(std::make_unique<WebKit::FindClient>(self));
767     _page->setDiagnosticLoggingClient(std::make_unique<WebKit::DiagnosticLoggingClient>(self));
768
769     _iconLoadingDelegate = std::make_unique<WebKit::IconLoadingDelegate>(self);
770
771     [self _setUpSQLiteDatabaseTrackerClient];
772
773     for (auto& pair : pageConfiguration->urlSchemeHandlers())
774         _page->setURLSchemeHandlerForScheme(WebKit::WebURLSchemeHandlerCocoa::create(static_cast<WebKit::WebURLSchemeHandlerCocoa&>(pair.value.get()).apiHandler()), pair.key);
775
776     pageToViewMap().add(_page.get(), self);
777
778 #if PLATFORM(IOS_FAMILY)
779     _dragInteractionPolicy = _WKDragInteractionPolicyDefault;
780
781     _timeOfRequestForVisibleContentRectUpdate = MonotonicTime::now();
782     _timeOfLastVisibleContentRectUpdate = MonotonicTime::now();
783 #if PLATFORM(WATCHOS)
784     _allowsViewportShrinkToFit = YES;
785 #else
786     _allowsViewportShrinkToFit = NO;
787 #endif
788 #endif // PLATFORM(IOS_FAMILY)
789 }
790
791 - (void)_setUpSQLiteDatabaseTrackerClient
792 {
793 #if PLATFORM(IOS_FAMILY)
794     WebBackgroundTaskController *controller = [WebBackgroundTaskController sharedController];
795     if (controller.backgroundTaskStartBlock)
796         return;
797
798     controller.backgroundTaskStartBlock = ^NSUInteger (void (^expirationHandler)())
799     {
800         return [[UIApplication sharedApplication] beginBackgroundTaskWithName:@"com.apple.WebKit.DatabaseActivity" expirationHandler:expirationHandler];
801     };
802     controller.backgroundTaskEndBlock = ^(UIBackgroundTaskIdentifier taskIdentifier)
803     {
804         [[UIApplication sharedApplication] endBackgroundTask:taskIdentifier];
805     };
806     controller.invalidBackgroundTaskIdentifier = UIBackgroundTaskInvalid;
807
808     WebCore::SQLiteDatabaseTracker::setClient(&WebCore::WebSQLiteDatabaseTrackerClient::sharedWebSQLiteDatabaseTrackerClient());
809 #endif
810 }
811
812 - (instancetype)initWithFrame:(CGRect)frame configuration:(WKWebViewConfiguration *)configuration
813 {
814     if (!(self = [super initWithFrame:frame]))
815         return nil;
816
817     [self _initializeWithConfiguration:configuration];
818
819     return self;
820 }
821
822 - (instancetype)initWithCoder:(NSCoder *)coder
823 {
824     if (!(self = [super initWithCoder:coder]))
825         return nil;
826
827     WKWebViewConfiguration *configuration = decodeObjectOfClassForKeyFromCoder([WKWebViewConfiguration class], @"configuration", coder);
828     [self _initializeWithConfiguration:configuration];
829
830     self.allowsBackForwardNavigationGestures = [coder decodeBoolForKey:@"allowsBackForwardNavigationGestures"];
831     self.customUserAgent = decodeObjectOfClassForKeyFromCoder([NSString class], @"customUserAgent", coder);
832     self.allowsLinkPreview = [coder decodeBoolForKey:@"allowsLinkPreview"];
833
834 #if PLATFORM(MAC)
835     self.allowsMagnification = [coder decodeBoolForKey:@"allowsMagnification"];
836     self.magnification = [coder decodeDoubleForKey:@"magnification"];
837 #endif
838
839     return self;
840 }
841
842 - (void)encodeWithCoder:(NSCoder *)coder
843 {
844     [super encodeWithCoder:coder];
845
846     [coder encodeObject:_configuration.get() forKey:@"configuration"];
847
848     [coder encodeBool:self.allowsBackForwardNavigationGestures forKey:@"allowsBackForwardNavigationGestures"];
849     [coder encodeObject:self.customUserAgent forKey:@"customUserAgent"];
850     [coder encodeBool:self.allowsLinkPreview forKey:@"allowsLinkPreview"];
851
852 #if PLATFORM(MAC)
853     [coder encodeBool:self.allowsMagnification forKey:@"allowsMagnification"];
854     [coder encodeDouble:self.magnification forKey:@"magnification"];
855 #endif
856 }
857
858 - (void)dealloc
859 {
860 #if PLATFORM(MAC)
861     [_textFinderClient willDestroyView:self];
862 #endif
863
864 #if PLATFORM(IOS_FAMILY)
865     [_contentView _webViewDestroyed];
866
867     if (_remoteObjectRegistry)
868         _page->process().processPool().removeMessageReceiver(Messages::RemoteObjectRegistry::messageReceiverName(), _page->pageID());
869 #endif
870
871     _page->close();
872
873 #if PLATFORM(IOS_FAMILY)
874     [_remoteObjectRegistry _invalidate];
875     [[_configuration _contentProviderRegistry] removePage:*_page];
876     [[NSNotificationCenter defaultCenter] removeObserver:self];
877     [_scrollView setInternalDelegate:nil];
878
879     CFNotificationCenterRemoveObserver(CFNotificationCenterGetDarwinNotifyCenter(), (__bridge const void *)(self), (CFStringRef)[NSString stringWithUTF8String:kGSEventHardwareKeyboardAvailabilityChangedNotification], nullptr);
880 #endif
881
882 #if ENABLE(ACCESSIBILITY_EVENTS)
883     CFNotificationCenterRemoveObserver(CFNotificationCenterGetDarwinNotifyCenter(), (__bridge const void *)(self), nullptr, nullptr);
884 #endif
885
886     pageToViewMap().remove(_page.get());
887
888     [super dealloc];
889 }
890
891 - (id)valueForUndefinedKey:(NSString *)key {
892     if ([key isEqualToString:@"serverTrust"])
893         return (__bridge id)[self serverTrust];
894
895     return [super valueForUndefinedKey:key];
896 }
897
898 - (WKWebViewConfiguration *)configuration
899 {
900     return [[_configuration copy] autorelease];
901 }
902
903 - (WKBackForwardList *)backForwardList
904 {
905     return wrapper(_page->backForwardList());
906 }
907
908 - (id <WKNavigationDelegate>)navigationDelegate
909 {
910     return _navigationState->navigationDelegate().autorelease();
911 }
912
913 - (void)setNavigationDelegate:(id <WKNavigationDelegate>)navigationDelegate
914 {
915     _page->setNavigationClient(_navigationState->createNavigationClient());
916     _navigationState->setNavigationDelegate(navigationDelegate);
917 }
918
919 - (id <WKUIDelegate>)UIDelegate
920 {
921     return _uiDelegate->delegate().autorelease();
922 }
923
924 - (void)setUIDelegate:(id<WKUIDelegate>)UIDelegate
925 {
926     _uiDelegate->setDelegate(UIDelegate);
927 #if ENABLE(CONTEXT_MENUS)
928     _page->setContextMenuClient(_uiDelegate->createContextMenuClient());
929 #endif
930     _page->setUIClient(_uiDelegate->createUIClient());
931 }
932
933 - (id <_WKIconLoadingDelegate>)_iconLoadingDelegate
934 {
935     return _iconLoadingDelegate->delegate().autorelease();
936 }
937
938 - (void)_setIconLoadingDelegate:(id<_WKIconLoadingDelegate>)iconLoadingDelegate
939 {
940     _page->setIconLoadingClient(_iconLoadingDelegate->createIconLoadingClient());
941     _iconLoadingDelegate->setDelegate(iconLoadingDelegate);
942 }
943
944 - (WKNavigation *)loadRequest:(NSURLRequest *)request
945 {
946     return wrapper(_page->loadRequest(request));
947 }
948
949 - (WKNavigation *)loadFileURL:(NSURL *)URL allowingReadAccessToURL:(NSURL *)readAccessURL
950 {
951     if (![URL isFileURL])
952         [NSException raise:NSInvalidArgumentException format:@"%@ is not a file URL", URL];
953
954     if (![readAccessURL isFileURL])
955         [NSException raise:NSInvalidArgumentException format:@"%@ is not a file URL", readAccessURL];
956
957     return wrapper(_page->loadFile([URL _web_originalDataAsWTFString], [readAccessURL _web_originalDataAsWTFString]));
958 }
959
960 - (WKNavigation *)loadHTMLString:(NSString *)string baseURL:(NSURL *)baseURL
961 {
962     NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
963
964     return [self loadData:data MIMEType:@"text/html" characterEncodingName:@"UTF-8" baseURL:baseURL];
965 }
966
967 - (WKNavigation *)loadData:(NSData *)data MIMEType:(NSString *)MIMEType characterEncodingName:(NSString *)characterEncodingName baseURL:(NSURL *)baseURL
968 {
969     return wrapper(_page->loadData({ static_cast<const uint8_t*>(data.bytes), data.length }, MIMEType, characterEncodingName, baseURL.absoluteString));
970 }
971
972 - (WKNavigation *)goToBackForwardListItem:(WKBackForwardListItem *)item
973 {
974     return wrapper(_page->goToBackForwardItem(item._item));
975 }
976
977 - (NSString *)title
978 {
979     return _page->pageLoadState().title();
980 }
981
982 - (NSURL *)URL
983 {
984     return [NSURL _web_URLWithWTFString:_page->pageLoadState().activeURL()];
985 }
986
987 - (BOOL)isLoading
988 {
989     return _page->pageLoadState().isLoading();
990 }
991
992 - (double)estimatedProgress
993 {
994     return _page->pageLoadState().estimatedProgress();
995 }
996
997 - (BOOL)hasOnlySecureContent
998 {
999     return _page->pageLoadState().hasOnlySecureContent();
1000 }
1001
1002 - (SecTrustRef)serverTrust
1003 {
1004 #if HAVE(SEC_TRUST_SERIALIZATION)
1005     auto certificateInfo = _page->pageLoadState().certificateInfo();
1006     if (!certificateInfo)
1007         return nil;
1008
1009     return certificateInfo->certificateInfo().trust();
1010 #else
1011     return nil;
1012 #endif
1013 }
1014
1015 - (BOOL)canGoBack
1016 {
1017     return _page->pageLoadState().canGoBack();
1018 }
1019
1020 - (BOOL)canGoForward
1021 {
1022     return _page->pageLoadState().canGoForward();
1023 }
1024
1025 - (WKNavigation *)goBack
1026 {
1027     if (self._safeBrowsingWarning)
1028         return [self reload];
1029     return wrapper(_page->goBack());
1030 }
1031
1032 - (WKNavigation *)goForward
1033 {
1034     return wrapper(_page->goForward());
1035 }
1036
1037 - (WKNavigation *)reload
1038 {
1039     OptionSet<WebCore::ReloadOption> reloadOptions;
1040     if (linkedOnOrAfter(WebKit::SDKVersion::FirstWithExpiredOnlyReloadBehavior))
1041         reloadOptions.add(WebCore::ReloadOption::ExpiredOnly);
1042
1043     return wrapper(_page->reload(reloadOptions));
1044 }
1045
1046 - (WKNavigation *)reloadFromOrigin
1047 {
1048     return wrapper(_page->reload(WebCore::ReloadOption::FromOrigin));
1049 }
1050
1051 - (void)stopLoading
1052 {
1053     _page->stopLoading();
1054 }
1055
1056 static WKErrorCode callbackErrorCode(WebKit::CallbackBase::Error error)
1057 {
1058     switch (error) {
1059     case WebKit::CallbackBase::Error::None:
1060         ASSERT_NOT_REACHED();
1061         return WKErrorUnknown;
1062
1063     case WebKit::CallbackBase::Error::Unknown:
1064         return WKErrorUnknown;
1065
1066     case WebKit::CallbackBase::Error::ProcessExited:
1067         return WKErrorWebContentProcessTerminated;
1068
1069     case WebKit::CallbackBase::Error::OwnerWasInvalidated:
1070         return WKErrorWebViewInvalidated;
1071     }
1072 }
1073
1074 - (void)evaluateJavaScript:(NSString *)javaScriptString completionHandler:(void (^)(id, NSError *))completionHandler
1075 {
1076     [self _evaluateJavaScript:javaScriptString forceUserGesture:YES completionHandler:completionHandler];
1077 }
1078
1079 - (void)_evaluateJavaScript:(NSString *)javaScriptString forceUserGesture:(BOOL)forceUserGesture completionHandler:(void (^)(id, NSError *))completionHandler
1080 {
1081     auto handler = adoptNS([completionHandler copy]);
1082
1083     _page->runJavaScriptInMainFrame(javaScriptString, forceUserGesture, [handler](API::SerializedScriptValue* serializedScriptValue, bool hadException, const WebCore::ExceptionDetails& details, WebKit::ScriptValueCallback::Error errorCode) {
1084         if (!handler)
1085             return;
1086
1087         if (errorCode != WebKit::ScriptValueCallback::Error::None) {
1088             auto error = createNSError(callbackErrorCode(errorCode));
1089             if (errorCode == WebKit::ScriptValueCallback::Error::OwnerWasInvalidated) {
1090                 // The OwnerWasInvalidated callback is synchronous. We don't want to call the block from within it
1091                 // because that can trigger re-entrancy bugs in WebKit.
1092                 // FIXME: It would be even better if GenericCallback did this for us.
1093                 dispatch_async(dispatch_get_main_queue(), [handler, error] {
1094                     auto rawHandler = (void (^)(id, NSError *))handler.get();
1095                     rawHandler(nil, error.get());
1096                 });
1097                 return;
1098             }
1099
1100             auto rawHandler = (void (^)(id, NSError *))handler.get();
1101             rawHandler(nil, error.get());
1102             return;
1103         }
1104
1105         auto rawHandler = (void (^)(id, NSError *))handler.get();
1106         if (hadException) {
1107             ASSERT(!serializedScriptValue);
1108
1109             RetainPtr<NSMutableDictionary> userInfo = adoptNS([[NSMutableDictionary alloc] init]);
1110
1111             [userInfo setObject:localizedDescriptionForErrorCode(WKErrorJavaScriptExceptionOccurred) forKey:NSLocalizedDescriptionKey];
1112             [userInfo setObject:static_cast<NSString *>(details.message) forKey:_WKJavaScriptExceptionMessageErrorKey];
1113             [userInfo setObject:@(details.lineNumber) forKey:_WKJavaScriptExceptionLineNumberErrorKey];
1114             [userInfo setObject:@(details.columnNumber) forKey:_WKJavaScriptExceptionColumnNumberErrorKey];
1115
1116             if (!details.sourceURL.isEmpty())
1117                 [userInfo setObject:[NSURL _web_URLWithWTFString:details.sourceURL] forKey:_WKJavaScriptExceptionSourceURLErrorKey];
1118
1119             rawHandler(nil, adoptNS([[NSError alloc] initWithDomain:WKErrorDomain code:WKErrorJavaScriptExceptionOccurred userInfo:userInfo.get()]).get());
1120             return;
1121         }
1122
1123         if (!serializedScriptValue) {
1124             rawHandler(nil, createNSError(WKErrorJavaScriptResultTypeIsUnsupported).get());
1125             return;
1126         }
1127
1128         id body = API::SerializedScriptValue::deserialize(serializedScriptValue->internalRepresentation(), 0);
1129         rawHandler(body, nil);
1130     });
1131 }
1132
1133 #if PLATFORM(MAC)
1134 - (void)takeSnapshotWithConfiguration:(WKSnapshotConfiguration *)snapshotConfiguration completionHandler:(void(^)(NSImage *, NSError *))completionHandler
1135 {
1136     CGRect rectInViewCoordinates = snapshotConfiguration && !CGRectIsNull(snapshotConfiguration.rect) ? snapshotConfiguration.rect : self.bounds;
1137     CGFloat snapshotWidth;
1138     if (snapshotConfiguration)
1139         snapshotWidth = snapshotConfiguration.snapshotWidth.doubleValue ?: rectInViewCoordinates.size.width;
1140     else
1141         snapshotWidth = self.bounds.size.width;
1142
1143     auto handler = makeBlockPtr(completionHandler);
1144     CGFloat imageScale = snapshotWidth / rectInViewCoordinates.size.width;
1145     CGFloat imageHeight = imageScale * rectInViewCoordinates.size.height;
1146
1147     // Need to scale by device scale factor or the image will be distorted.
1148     CGFloat deviceScale = _page->deviceScaleFactor();
1149     WebCore::IntSize bitmapSize(snapshotWidth, imageHeight);
1150     bitmapSize.scale(deviceScale, deviceScale);
1151
1152     // Software snapshot will not capture elements rendered with hardware acceleration (WebGL, video, etc).
1153     // This code doesn't consider snapshotConfiguration.afterScreenUpdates since the software snapshot always
1154     // contains recent updates. If we ever have a UI-side snapshot mechanism on macOS, we will need to factor
1155     // in snapshotConfiguration.afterScreenUpdates at that time.
1156     _page->takeSnapshot(WebCore::enclosingIntRect(rectInViewCoordinates), bitmapSize, WebKit::SnapshotOptionsInViewCoordinates, [handler, snapshotWidth, imageHeight](const WebKit::ShareableBitmap::Handle& imageHandle, WebKit::CallbackBase::Error errorCode) {
1157         if (errorCode != WebKit::ScriptValueCallback::Error::None) {
1158             auto error = createNSError(callbackErrorCode(errorCode));
1159             handler(nil, error.get());
1160             return;
1161         }
1162
1163         auto bitmap = WebKit::ShareableBitmap::create(imageHandle, WebKit::SharedMemory::Protection::ReadOnly);
1164         RetainPtr<CGImageRef> cgImage = bitmap ? bitmap->makeCGImage() : nullptr;
1165         RetainPtr<NSImage> nsImage = adoptNS([[NSImage alloc] initWithCGImage:cgImage.get() size:NSMakeSize(snapshotWidth, imageHeight)]);
1166         handler(nsImage.get(), nil);
1167     });
1168 }
1169
1170 #elif PLATFORM(IOS_FAMILY)
1171 - (void)takeSnapshotWithConfiguration:(WKSnapshotConfiguration *)snapshotConfiguration completionHandler:(void(^)(UIImage *, NSError *))completionHandler
1172 {
1173     CGRect rectInViewCoordinates = snapshotConfiguration && !CGRectIsNull(snapshotConfiguration.rect) ? snapshotConfiguration.rect : self.bounds;
1174     CGFloat snapshotWidth;
1175     if (snapshotConfiguration)
1176         snapshotWidth = snapshotConfiguration.snapshotWidth.doubleValue ?: rectInViewCoordinates.size.width;
1177     else
1178         snapshotWidth = self.bounds.size.width;
1179
1180     auto handler = makeBlockPtr(completionHandler);
1181     CGFloat deviceScale = _page->deviceScaleFactor();
1182     RetainPtr<WKWebView> strongSelf = self;
1183     auto callSnapshotRect = [strongSelf, rectInViewCoordinates, snapshotWidth, deviceScale, handler] {
1184         [strongSelf _snapshotRect:rectInViewCoordinates intoImageOfWidth:(snapshotWidth * deviceScale) completionHandler:[strongSelf, handler, deviceScale](CGImageRef snapshotImage) {
1185             RetainPtr<NSError> error;
1186             RetainPtr<UIImage> uiImage;
1187             
1188             if (!snapshotImage)
1189                 error = createNSError(WKErrorUnknown);
1190             else
1191                 uiImage = adoptNS([[UIImage alloc] initWithCGImage:snapshotImage scale:deviceScale orientation:UIImageOrientationUp]);
1192             
1193             handler(uiImage.get(), error.get());
1194         }];
1195     };
1196
1197     if ((snapshotConfiguration && !snapshotConfiguration.afterScreenUpdates) || !linkedOnOrAfter(WebKit::SDKVersion::FirstWithSnapshotAfterScreenUpdates)) {
1198         callSnapshotRect();
1199         return;
1200     }
1201
1202     _page->callAfterNextPresentationUpdate([callSnapshotRect = WTFMove(callSnapshotRect), handler](WebKit::CallbackBase::Error error) {
1203         if (error != WebKit::CallbackBase::Error::None) {
1204             handler(nil, createNSError(WKErrorUnknown).get());
1205             return;
1206         }
1207         callSnapshotRect();
1208     });
1209 }
1210 #endif
1211
1212 - (NSString *)customUserAgent
1213 {
1214     return _page->customUserAgent();
1215 }
1216
1217 - (void)setCustomUserAgent:(NSString *)customUserAgent
1218 {
1219     _page->setCustomUserAgent(customUserAgent);
1220 }
1221
1222 - (WKPageRef)_pageForTesting
1223 {
1224     return toAPI(_page.get());
1225 }
1226
1227 - (WebKit::WebPageProxy *)_page
1228 {
1229     return _page.get();
1230 }
1231
1232 - (BOOL)allowsLinkPreview
1233 {
1234 #if PLATFORM(MAC)
1235     return _impl->allowsLinkPreview();
1236 #elif PLATFORM(IOS_FAMILY)
1237     return _allowsLinkPreview;
1238 #endif
1239 }
1240
1241 - (void)setAllowsLinkPreview:(BOOL)allowsLinkPreview
1242 {
1243 #if PLATFORM(MAC)
1244     _impl->setAllowsLinkPreview(allowsLinkPreview);
1245     return;
1246 #elif PLATFORM(IOS_FAMILY)
1247     if (_allowsLinkPreview == allowsLinkPreview)
1248         return;
1249
1250     _allowsLinkPreview = allowsLinkPreview;
1251
1252 #if HAVE(LINK_PREVIEW)
1253     if (_allowsLinkPreview)
1254         [_contentView _registerPreview];
1255     else
1256         [_contentView _unregisterPreview];
1257 #endif // HAVE(LINK_PREVIEW)
1258 #endif // PLATFORM(IOS_FAMILY)
1259 }
1260
1261 - (CGSize)_viewportSizeForCSSViewportUnits
1262 {
1263     return _page->viewportSizeForCSSViewportUnits();
1264 }
1265
1266 - (void)_setViewportSizeForCSSViewportUnits:(CGSize)viewportSize
1267 {
1268     auto viewportSizeForViewportUnits = WebCore::IntSize(viewportSize);
1269     if (viewportSizeForViewportUnits.isEmpty())
1270         [NSException raise:NSInvalidArgumentException format:@"Viewport size should not be empty"];
1271
1272     _page->setViewportSizeForCSSViewportUnits(viewportSizeForViewportUnits);
1273 }
1274
1275 static NSTextAlignment nsTextAlignment(WebKit::TextAlignment alignment)
1276 {
1277     switch (alignment) {
1278     case WebKit::NoAlignment:
1279         return NSTextAlignmentNatural;
1280     case WebKit::LeftAlignment:
1281         return NSTextAlignmentLeft;
1282     case WebKit::RightAlignment:
1283         return NSTextAlignmentRight;
1284     case WebKit::CenterAlignment:
1285         return NSTextAlignmentCenter;
1286     case WebKit::JustifiedAlignment:
1287         return NSTextAlignmentJustified;
1288     }
1289     ASSERT_NOT_REACHED();
1290     return NSTextAlignmentNatural;
1291 }
1292
1293 static NSDictionary *dictionaryRepresentationForEditorState(const WebKit::EditorState& state)
1294 {
1295     if (state.isMissingPostLayoutData)
1296         return @{ @"post-layout-data" : @NO };
1297
1298     auto& postLayoutData = state.postLayoutData();
1299     return @{
1300         @"post-layout-data" : @YES,
1301         @"bold": postLayoutData.typingAttributes & WebKit::AttributeBold ? @YES : @NO,
1302         @"italic": postLayoutData.typingAttributes & WebKit::AttributeItalics ? @YES : @NO,
1303         @"underline": postLayoutData.typingAttributes & WebKit::AttributeUnderline ? @YES : @NO,
1304         @"text-alignment": @(nsTextAlignment(static_cast<WebKit::TextAlignment>(postLayoutData.textAlignment))),
1305         @"text-color": (NSString *)postLayoutData.textColor.cssText()
1306     };
1307 }
1308
1309 static _WKSelectionAttributes selectionAttributes(const WebKit::EditorState& editorState, _WKSelectionAttributes previousAttributes)
1310 {
1311     _WKSelectionAttributes attributes = _WKSelectionAttributeNoSelection;
1312     if (editorState.selectionIsNone)
1313         return attributes;
1314
1315     if (editorState.selectionIsRange)
1316         attributes |= _WKSelectionAttributeIsRange;
1317     else
1318         attributes |= _WKSelectionAttributeIsCaret;
1319
1320     if (!editorState.isMissingPostLayoutData) {
1321 #if PLATFORM(IOS_FAMILY)
1322         if (editorState.postLayoutData().atStartOfSentence)
1323             attributes |= _WKSelectionAttributeAtStartOfSentence;
1324 #endif
1325     } else if (previousAttributes & _WKSelectionAttributeAtStartOfSentence)
1326         attributes |= _WKSelectionAttributeAtStartOfSentence;
1327
1328     return attributes;
1329 }
1330
1331 - (void)_didChangeEditorState
1332 {
1333     auto newSelectionAttributes = selectionAttributes(_page->editorState(), _selectionAttributes);
1334     if (_selectionAttributes != newSelectionAttributes) {
1335         NSString *selectionAttributesKey = NSStringFromSelector(@selector(_selectionAttributes));
1336         [self willChangeValueForKey:selectionAttributesKey];
1337         _selectionAttributes = newSelectionAttributes;
1338         [self didChangeValueForKey:selectionAttributesKey];
1339     }
1340
1341     // FIXME: We should either rename -_webView:editorStateDidChange: to clarify that it's only intended for use when testing,
1342     // or remove it entirely and use -_webView:didChangeFontAttributes: instead once text alignment is supported in the set of
1343     // font attributes.
1344     id <WKUIDelegatePrivate> uiDelegate = (id <WKUIDelegatePrivate>)self.UIDelegate;
1345     if ([uiDelegate respondsToSelector:@selector(_webView:editorStateDidChange:)])
1346         [uiDelegate _webView:self editorStateDidChange:dictionaryRepresentationForEditorState(_page->editorState())];
1347 }
1348
1349 - (_WKSelectionAttributes)_selectionAttributes
1350 {
1351     return _selectionAttributes;
1352 }
1353
1354 - (void)_showSafeBrowsingWarning:(const WebKit::SafeBrowsingWarning&)warning completionHandler:(CompletionHandler<void(Variant<WebKit::ContinueUnsafeLoad, URL>&&)>&&)completionHandler
1355 {
1356     _safeBrowsingWarning = adoptNS([[WKSafeBrowsingWarning alloc] initWithFrame:self.bounds safeBrowsingWarning:warning completionHandler:[weakSelf = WeakObjCPtr<WKWebView>(self), completionHandler = WTFMove(completionHandler)] (auto&& result) mutable {
1357         completionHandler(WTFMove(result));
1358         auto strongSelf = weakSelf.get();
1359         if (!strongSelf)
1360             return;
1361         bool navigatesFrame = WTF::switchOn(result,
1362             [] (WebKit::ContinueUnsafeLoad continueUnsafeLoad) { return continueUnsafeLoad == WebKit::ContinueUnsafeLoad::Yes; },
1363             [] (const URL&) { return true; }
1364         );
1365         bool forMainFrameNavigation = [strongSelf->_safeBrowsingWarning forMainFrameNavigation];
1366         if (navigatesFrame && forMainFrameNavigation) {
1367             // The safe browsing warning will be hidden once the next page is shown.
1368             return;
1369         }
1370         if (!navigatesFrame && strongSelf->_safeBrowsingWarning && !forMainFrameNavigation) {
1371             strongSelf->_page->goBack();
1372             return;
1373         }
1374         [std::exchange(strongSelf->_safeBrowsingWarning, nullptr) removeFromSuperview];
1375     }]);
1376     [self addSubview:_safeBrowsingWarning.get()];
1377 }
1378
1379 - (void)_clearSafeBrowsingWarning
1380 {
1381     [std::exchange(_safeBrowsingWarning, nullptr) removeFromSuperview];
1382 }
1383
1384 - (void)_clearSafeBrowsingWarningIfForMainFrameNavigation
1385 {
1386     if ([_safeBrowsingWarning forMainFrameNavigation])
1387         [self _clearSafeBrowsingWarning];
1388 }
1389
1390 #if ENABLE(ATTACHMENT_ELEMENT)
1391
1392 - (void)_didInsertAttachment:(API::Attachment&)attachment withSource:(NSString *)source
1393 {
1394     id <WKUIDelegatePrivate> uiDelegate = (id <WKUIDelegatePrivate>)self.UIDelegate;
1395     if ([uiDelegate respondsToSelector:@selector(_webView:didInsertAttachment:withSource:)])
1396         [uiDelegate _webView:self didInsertAttachment:wrapper(attachment) withSource:source];
1397 }
1398
1399 - (void)_didRemoveAttachment:(API::Attachment&)attachment
1400 {
1401     id <WKUIDelegatePrivate> uiDelegate = (id <WKUIDelegatePrivate>)self.UIDelegate;
1402     if ([uiDelegate respondsToSelector:@selector(_webView:didRemoveAttachment:)])
1403         [uiDelegate _webView:self didRemoveAttachment:wrapper(attachment)];
1404 }
1405
1406 - (void)_didInvalidateDataForAttachment:(API::Attachment&)attachment
1407 {
1408     id <WKUIDelegatePrivate> uiDelegate = (id <WKUIDelegatePrivate>)self.UIDelegate;
1409     if ([uiDelegate respondsToSelector:@selector(_webView:didInvalidateDataForAttachment:)])
1410         [uiDelegate _webView:self didInvalidateDataForAttachment:wrapper(attachment)];
1411 }
1412
1413 #endif // ENABLE(ATTACHMENT_ELEMENT)
1414
1415 #pragma mark iOS-specific methods
1416
1417 #if PLATFORM(IOS_FAMILY)
1418
1419 - (BOOL)_contentViewIsFirstResponder
1420 {
1421     return self._currentContentView.isFirstResponder;
1422 }
1423
1424 - (_WKDragInteractionPolicy)_dragInteractionPolicy
1425 {
1426     return _dragInteractionPolicy;
1427 }
1428
1429 - (void)_setDragInteractionPolicy:(_WKDragInteractionPolicy)policy
1430 {
1431     if (_dragInteractionPolicy == policy)
1432         return;
1433
1434     _dragInteractionPolicy = policy;
1435 #if ENABLE(DRAG_SUPPORT)
1436     [_contentView _didChangeDragInteractionPolicy];
1437 #endif
1438 }
1439
1440 - (void)_populateArchivedSubviews:(NSMutableSet *)encodedViews
1441 {
1442     [super _populateArchivedSubviews:encodedViews];
1443
1444     if (_scrollView)
1445         [encodedViews removeObject:_scrollView.get()];
1446     if (_customContentFixedOverlayView)
1447         [encodedViews removeObject:_customContentFixedOverlayView.get()];
1448 }
1449
1450 - (BOOL)_isBackground
1451 {
1452     if ([self _isDisplayingPDF])
1453         return [_customContentView web_isBackground];
1454     return [_contentView isBackground];
1455 }
1456
1457 - (void)setFrame:(CGRect)frame
1458 {
1459     CGRect oldFrame = self.frame;
1460     [super setFrame:frame];
1461
1462     if (!CGSizeEqualToSize(oldFrame.size, frame.size))
1463         [self _frameOrBoundsChanged];
1464 }
1465
1466 - (void)setBounds:(CGRect)bounds
1467 {
1468     CGRect oldBounds = self.bounds;
1469     [super setBounds:bounds];
1470     [_customContentFixedOverlayView setFrame:self.bounds];
1471
1472     if (!CGSizeEqualToSize(oldBounds.size, bounds.size))
1473         [self _frameOrBoundsChanged];
1474 }
1475
1476 - (void)layoutSubviews
1477 {
1478     [_safeBrowsingWarning setFrame:self.bounds];
1479     [super layoutSubviews];
1480     [self _frameOrBoundsChanged];
1481 }
1482
1483 - (UIScrollView *)scrollView
1484 {
1485     return _scrollView.get();
1486 }
1487
1488 ALLOW_DEPRECATED_DECLARATIONS_BEGIN
1489 - (WKBrowsingContextController *)browsingContextController
1490 {
1491     return [_contentView browsingContextController];
1492 }
1493 ALLOW_DEPRECATED_DECLARATIONS_END
1494
1495 - (BOOL)becomeFirstResponder
1496 {
1497     UIView *currentContentView = self._currentContentView;
1498     if (currentContentView == _contentView && [_contentView superview])
1499         return [_contentView becomeFirstResponderForWebView] || [super becomeFirstResponder];
1500
1501     return [currentContentView becomeFirstResponder] || [super becomeFirstResponder];
1502 }
1503
1504 - (BOOL)canBecomeFirstResponder
1505 {
1506     if (self._currentContentView == _contentView)
1507         return [_contentView canBecomeFirstResponderForWebView];
1508
1509     return YES;
1510 }
1511
1512 - (BOOL)resignFirstResponder
1513 {
1514     if ([_contentView isFirstResponder])
1515         return [_contentView resignFirstResponderForWebView];
1516
1517     return [super resignFirstResponder];
1518 }
1519
1520 FOR_EACH_WKCONTENTVIEW_ACTION(FORWARD_ACTION_TO_WKCONTENTVIEW)
1521
1522 - (BOOL)canPerformAction:(SEL)action withSender:(id)sender
1523 {
1524     #define FORWARD_CANPERFORMACTION_TO_WKCONTENTVIEW(_action) \
1525         if (action == @selector(_action:)) \
1526             return self.usesStandardContentView && [_contentView canPerformActionForWebView:action withSender:sender];
1527
1528     FOR_EACH_WKCONTENTVIEW_ACTION(FORWARD_CANPERFORMACTION_TO_WKCONTENTVIEW)
1529     FOR_EACH_PRIVATE_WKCONTENTVIEW_ACTION(FORWARD_CANPERFORMACTION_TO_WKCONTENTVIEW)
1530     FORWARD_CANPERFORMACTION_TO_WKCONTENTVIEW(_setTextColor:sender)
1531     FORWARD_CANPERFORMACTION_TO_WKCONTENTVIEW(_setFontSize:sender)
1532     FORWARD_CANPERFORMACTION_TO_WKCONTENTVIEW(_setFont:sender)
1533
1534     #undef FORWARD_CANPERFORMACTION_TO_WKCONTENTVIEW
1535
1536     return [super canPerformAction:action withSender:sender];
1537 }
1538
1539 - (id)targetForAction:(SEL)action withSender:(id)sender
1540 {
1541     #define FORWARD_TARGETFORACTION_TO_WKCONTENTVIEW(_action) \
1542         if (action == @selector(_action:) && self.usesStandardContentView) \
1543             return [_contentView targetForActionForWebView:action withSender:sender];
1544
1545     FOR_EACH_WKCONTENTVIEW_ACTION(FORWARD_TARGETFORACTION_TO_WKCONTENTVIEW)
1546     FOR_EACH_PRIVATE_WKCONTENTVIEW_ACTION(FORWARD_TARGETFORACTION_TO_WKCONTENTVIEW)
1547     FORWARD_TARGETFORACTION_TO_WKCONTENTVIEW(_setTextColor:sender)
1548     FORWARD_TARGETFORACTION_TO_WKCONTENTVIEW(_setFontSize:sender)
1549     FORWARD_TARGETFORACTION_TO_WKCONTENTVIEW(_setFont:sender)
1550
1551     #undef FORWARD_TARGETFORACTION_TO_WKCONTENTVIEW
1552
1553     return [super targetForAction:action withSender:sender];
1554 }
1555
1556 static inline CGFloat floorToDevicePixel(CGFloat input, float deviceScaleFactor)
1557 {
1558     return CGFloor(input * deviceScaleFactor) / deviceScaleFactor;
1559 }
1560
1561 static inline bool pointsEqualInDevicePixels(CGPoint a, CGPoint b, float deviceScaleFactor)
1562 {
1563     return fabs(a.x * deviceScaleFactor - b.x * deviceScaleFactor) < std::numeric_limits<float>::epsilon()
1564         && fabs(a.y * deviceScaleFactor - b.y * deviceScaleFactor) < std::numeric_limits<float>::epsilon();
1565 }
1566
1567 static CGSize roundScrollViewContentSize(const WebKit::WebPageProxy& page, CGSize contentSize)
1568 {
1569     float deviceScaleFactor = page.deviceScaleFactor();
1570     return CGSizeMake(floorToDevicePixel(contentSize.width, deviceScaleFactor), floorToDevicePixel(contentSize.height, deviceScaleFactor));
1571 }
1572
1573 - (UIView *)_currentContentView
1574 {
1575     return _customContentView ? [_customContentView web_contentView] : _contentView.get();
1576 }
1577
1578 - (WKWebViewContentProviderRegistry *)_contentProviderRegistry
1579 {
1580     return [_configuration _contentProviderRegistry];
1581 }
1582
1583 - (WKSelectionGranularity)_selectionGranularity
1584 {
1585     return [_configuration selectionGranularity];
1586 }
1587
1588 - (void)_setHasCustomContentView:(BOOL)pageHasCustomContentView loadedMIMEType:(const WTF::String&)mimeType
1589 {
1590     if (pageHasCustomContentView) {
1591         [_customContentView removeFromSuperview];
1592         [_customContentFixedOverlayView removeFromSuperview];
1593
1594         Class representationClass = [[_configuration _contentProviderRegistry] providerForMIMEType:mimeType];
1595         ASSERT(representationClass);
1596         _customContentView = adoptNS([[representationClass alloc] web_initWithFrame:self.bounds webView:self mimeType:mimeType]);
1597         _customContentFixedOverlayView = adoptNS([[UIView alloc] initWithFrame:self.bounds]);
1598         [_customContentFixedOverlayView layer].name = @"CustomContentFixedOverlay";
1599         [_customContentFixedOverlayView setUserInteractionEnabled:NO];
1600
1601         [[_contentView unscaledView] removeFromSuperview];
1602         [_contentView removeFromSuperview];
1603         [_scrollView addSubview:_customContentView.get()];
1604         [self addSubview:_customContentFixedOverlayView.get()];
1605
1606         [_customContentView web_setMinimumSize:self.bounds.size];
1607         [_customContentView web_setFixedOverlayView:_customContentFixedOverlayView.get()];
1608
1609         _scrollViewBackgroundColor = WebCore::Color();
1610         [_scrollView setContentOffset:[self _initialContentOffsetForScrollView]];
1611
1612         [self _setAvoidsUnsafeArea:NO];
1613     } else if (_customContentView) {
1614         [_customContentView removeFromSuperview];
1615         _customContentView = nullptr;
1616
1617         [_customContentFixedOverlayView removeFromSuperview];
1618         _customContentFixedOverlayView = nullptr;
1619
1620         [_scrollView addSubview:_contentView.get()];
1621         [_scrollView addSubview:[_contentView unscaledView]];
1622         [_scrollView setContentSize:roundScrollViewContentSize(*_page, [_contentView frame].size)];
1623
1624         [_customContentFixedOverlayView setFrame:self.bounds];
1625         [self addSubview:_customContentFixedOverlayView.get()];
1626     }
1627
1628     if (self.isFirstResponder) {
1629         UIView *currentContentView = self._currentContentView;
1630         if (currentContentView == _contentView ? [_contentView canBecomeFirstResponderForWebView] : currentContentView.canBecomeFirstResponder)
1631             [currentContentView becomeFirstResponder];
1632     }
1633 }
1634
1635 - (void)_didFinishLoadingDataForCustomContentProviderWithSuggestedFilename:(const String&)suggestedFilename data:(NSData *)data
1636 {
1637     ASSERT(_customContentView);
1638     [_customContentView web_setContentProviderData:data suggestedFilename:suggestedFilename];
1639
1640     // FIXME: It may make more sense for custom content providers to invoke this when they're ready,
1641     // because there's no guarantee that all custom content providers will lay out synchronously.
1642     _page->didLayoutForCustomContentProvider();
1643 }
1644
1645 - (void)_handleKeyUIEvent:(::UIEvent *)event
1646 {
1647     // We only want to handle key events from the hardware keyboard when we are
1648     // first responder and a custom content view is installed; otherwise,
1649     // WKContentView will be the first responder and expects to get key events directly.
1650     if ([self isFirstResponder] && event._hidEvent) {
1651         if ([_customContentView respondsToSelector:@selector(web_handleKeyEvent:)]) {
1652             if ([_customContentView web_handleKeyEvent:event])
1653                 return;
1654         }
1655     }
1656
1657     [super _handleKeyUIEvent:event];
1658 }
1659
1660 - (void)_willInvokeUIScrollViewDelegateCallback
1661 {
1662     _delayUpdateVisibleContentRects = YES;
1663 }
1664
1665 - (void)_didInvokeUIScrollViewDelegateCallback
1666 {
1667     _delayUpdateVisibleContentRects = NO;
1668     if (_hadDelayedUpdateVisibleContentRects) {
1669         _hadDelayedUpdateVisibleContentRects = NO;
1670         [self _scheduleVisibleContentRectUpdate];
1671     }
1672 }
1673
1674 static CGFloat contentZoomScale(WKWebView *webView)
1675 {
1676     CGFloat scale = webView._currentContentView.layer.affineTransform.a;
1677     ASSERT(scale == [webView->_scrollView zoomScale]);
1678     return scale;
1679 }
1680
1681 static WebCore::Color baseScrollViewBackgroundColor(WKWebView *webView)
1682 {
1683     if (webView->_customContentView)
1684         return [webView->_customContentView backgroundColor].CGColor;
1685
1686     if (webView->_gestureController) {
1687         WebCore::Color color = webView->_gestureController->backgroundColorForCurrentSnapshot();
1688         if (color.isValid())
1689             return color;
1690     }
1691
1692     return webView->_page->pageExtendedBackgroundColor();
1693 }
1694
1695 static WebCore::Color scrollViewBackgroundColor(WKWebView *webView)
1696 {
1697     if (!webView.opaque)
1698         return WebCore::Color::transparent;
1699
1700     WebCore::Color color = baseScrollViewBackgroundColor(webView);
1701
1702     if (!color.isValid())
1703         color = [webView->_contentView backgroundColor].CGColor;
1704
1705     CGFloat zoomScale = contentZoomScale(webView);
1706     CGFloat minimumZoomScale = [webView->_scrollView minimumZoomScale];
1707     if (zoomScale < minimumZoomScale) {
1708         CGFloat slope = 12;
1709         CGFloat opacity = std::max<CGFloat>(1 - slope * (minimumZoomScale - zoomScale), 0);
1710         color = WebCore::colorWithOverrideAlpha(color.rgb(), opacity);
1711     }
1712
1713     return color;
1714 }
1715
1716 - (void)_updateScrollViewBackground
1717 {
1718     WebCore::Color color = scrollViewBackgroundColor(self);
1719
1720     if (_scrollViewBackgroundColor == color)
1721         return;
1722
1723     _scrollViewBackgroundColor = color;
1724
1725     auto uiBackgroundColor = adoptNS([[UIColor alloc] initWithCGColor:cachedCGColor(color)]);
1726     [_scrollView setBackgroundColor:uiBackgroundColor.get()];
1727
1728     // Update the indicator style based on the lightness/darkness of the background color.
1729     double hue, saturation, lightness;
1730     color.getHSL(hue, saturation, lightness);
1731     if (lightness <= .5 && color.isVisible())
1732         [_scrollView setIndicatorStyle:UIScrollViewIndicatorStyleWhite];
1733     else
1734         [_scrollView setIndicatorStyle:UIScrollViewIndicatorStyleDefault];
1735 }
1736
1737 - (void)_videoControlsManagerDidChange
1738 {
1739 #if ENABLE(FULLSCREEN_API)
1740     if (_fullScreenWindowController)
1741         [_fullScreenWindowController videoControlsManagerDidChange];
1742 #endif
1743 }
1744
1745 - (CGPoint)_initialContentOffsetForScrollView
1746 {
1747     auto combinedUnobscuredAndScrollViewInset = [self _computedContentInset];
1748     return CGPointMake(-combinedUnobscuredAndScrollViewInset.left, -combinedUnobscuredAndScrollViewInset.top);
1749 }
1750
1751 - (CGPoint)_contentOffsetAdjustedForObscuredInset:(CGPoint)point
1752 {
1753     CGPoint result = point;
1754     UIEdgeInsets contentInset = [self _computedObscuredInset];
1755
1756     result.x -= contentInset.left;
1757     result.y -= contentInset.top;
1758
1759     return result;
1760 }
1761
1762 - (UIRectEdge)_effectiveObscuredInsetEdgesAffectedBySafeArea
1763 {
1764     if (![self usesStandardContentView])
1765         return UIRectEdgeAll;
1766     return _obscuredInsetEdgesAffectedBySafeArea;
1767 }
1768
1769 - (UIEdgeInsets)_computedObscuredInset
1770 {
1771     if (!linkedOnOrAfter(WebKit::SDKVersion::FirstWhereScrollViewContentInsetsAreNotObscuringInsets)) {
1772         // For binary compability with third party apps, treat scroll view content insets as obscuring insets when the app is compiled
1773         // against a WebKit version without the fix in r229641.
1774         return [self _computedContentInset];
1775     }
1776
1777     if (_haveSetObscuredInsets)
1778         return _obscuredInsets;
1779
1780 #if PLATFORM(IOS)
1781     if (self._safeAreaShouldAffectObscuredInsets)
1782         return UIEdgeInsetsAdd(UIEdgeInsetsZero, self._scrollViewSystemContentInset, self._effectiveObscuredInsetEdgesAffectedBySafeArea);
1783 #endif
1784
1785     return UIEdgeInsetsZero;
1786 }
1787
1788 - (UIEdgeInsets)_computedContentInset
1789 {
1790     if (_haveSetObscuredInsets)
1791         return _obscuredInsets;
1792
1793     UIEdgeInsets insets = [_scrollView contentInset];
1794
1795 #if PLATFORM(IOS)
1796     if (self._safeAreaShouldAffectObscuredInsets)
1797         insets = UIEdgeInsetsAdd(insets, self._scrollViewSystemContentInset, self._effectiveObscuredInsetEdgesAffectedBySafeArea);
1798 #endif
1799
1800     return insets;
1801 }
1802
1803 - (UIEdgeInsets)_computedUnobscuredSafeAreaInset
1804 {
1805     if (_haveSetUnobscuredSafeAreaInsets)
1806         return _unobscuredSafeAreaInsets;
1807
1808 #if PLATFORM(IOS)
1809     if (!self._safeAreaShouldAffectObscuredInsets)
1810         return self.safeAreaInsets;
1811 #endif
1812
1813     return UIEdgeInsetsZero;
1814 }
1815
1816 - (void)_processWillSwapOrDidExit
1817 {
1818     // FIXME: Which ones of these need to be done in the process swap case and which ones in the exit case?
1819     [self _hidePasswordView];
1820     [self _cancelAnimatedResize];
1821
1822     _viewportMetaTagWidth = WebCore::ViewportArguments::ValueAuto;
1823     _initialScaleFactor = 1;
1824     _hasCommittedLoadForMainFrame = NO;
1825     _needsResetViewStateAfterCommitLoadForMainFrame = NO;
1826     _dynamicViewportUpdateMode = WebKit::DynamicViewportUpdateMode::NotResizing;
1827     _waitingForEndAnimatedResize = NO;
1828     _waitingForCommitAfterAnimatedResize = NO;
1829     _animatedResizeOriginalContentWidth = 0;
1830     [_contentView setHidden:NO];
1831     _scrollOffsetToRestore = WTF::nullopt;
1832     _unobscuredCenterToRestore = WTF::nullopt;
1833     _scrollViewBackgroundColor = WebCore::Color();
1834     _delayUpdateVisibleContentRects = NO;
1835     _hadDelayedUpdateVisibleContentRects = NO;
1836     _currentlyAdjustingScrollViewInsetsForKeyboard = NO;
1837     _lastSentViewLayoutSize = WTF::nullopt;
1838     _lastSentMaximumUnobscuredSize = WTF::nullopt;
1839     _lastSentDeviceOrientation = WTF::nullopt;
1840
1841     _frozenVisibleContentRect = WTF::nullopt;
1842     _frozenUnobscuredContentRect = WTF::nullopt;
1843
1844     _firstPaintAfterCommitLoadTransactionID = 0;
1845     _firstTransactionIDAfterPageRestore = WTF::nullopt;
1846
1847     _hasScheduledVisibleRectUpdate = NO;
1848     _commitDidRestoreScrollPosition = NO;
1849
1850     _avoidsUnsafeArea = YES;
1851 }
1852
1853 - (void)_processWillSwap
1854 {
1855     RELEASE_LOG_IF_ALLOWED("%p -[WKWebView _processWillSwap]", self);
1856     [self _processWillSwapOrDidExit];
1857     if (_gestureController)
1858         _gestureController->disconnectFromProcess();
1859 }
1860
1861 - (void)_processDidExit
1862 {
1863     RELEASE_LOG_IF_ALLOWED("%p -[WKWebView _processDidExit]", self);
1864
1865     [self _processWillSwapOrDidExit];
1866
1867     [_contentView setFrame:self.bounds];
1868     [_scrollView setBackgroundColor:[_contentView backgroundColor]];
1869     [_scrollView setContentOffset:[self _initialContentOffsetForScrollView]];
1870     [_scrollView setZoomScale:1];
1871     _gestureController = nullptr;
1872 }
1873
1874 - (void)_didRelaunchProcess
1875 {
1876     RELEASE_LOG_IF_ALLOWED("%p -[WKWebView _didRelaunchProcess]", self);
1877     _hasScheduledVisibleRectUpdate = NO;
1878     _visibleContentRectUpdateScheduledFromScrollViewInStableState = YES;
1879     if (_gestureController)
1880         _gestureController->connectToProcess();
1881 }
1882
1883 - (void)_didCommitLoadForMainFrame
1884 {
1885     _firstPaintAfterCommitLoadTransactionID = downcast<WebKit::RemoteLayerTreeDrawingAreaProxy>(*_page->drawingArea()).nextLayerTreeTransactionID();
1886
1887     _hasCommittedLoadForMainFrame = YES;
1888     _needsResetViewStateAfterCommitLoadForMainFrame = YES;
1889
1890     [_scrollView _stopScrollingAndZoomingAnimations];
1891 }
1892
1893 static CGPoint contentOffsetBoundedInValidRange(UIScrollView *scrollView, CGPoint contentOffset)
1894 {
1895 #if __IPHONE_OS_VERSION_MIN_REQUIRED >= 110000
1896     UIEdgeInsets contentInsets = scrollView.adjustedContentInset;
1897 #else
1898     UIEdgeInsets contentInsets = scrollView.contentInset;
1899 #endif
1900
1901     CGSize contentSize = scrollView.contentSize;
1902     CGSize scrollViewSize = scrollView.bounds.size;
1903
1904     CGPoint minimumContentOffset = CGPointMake(-contentInsets.left, -contentInsets.top);
1905     CGPoint maximumContentOffset = CGPointMake(std::max(minimumContentOffset.x, contentSize.width + contentInsets.right - scrollViewSize.width), std::max(minimumContentOffset.y, contentSize.height + contentInsets.bottom - scrollViewSize.height));
1906
1907     return CGPointMake(std::max(std::min(contentOffset.x, maximumContentOffset.x), minimumContentOffset.x), std::max(std::min(contentOffset.y, maximumContentOffset.y), minimumContentOffset.y));
1908 }
1909
1910 static void changeContentOffsetBoundedInValidRange(UIScrollView *scrollView, WebCore::FloatPoint contentOffset)
1911 {
1912     scrollView.contentOffset = contentOffsetBoundedInValidRange(scrollView, contentOffset);
1913 }
1914
1915 - (WebCore::FloatRect)visibleRectInViewCoordinates
1916 {
1917     WebCore::FloatRect bounds = self.bounds;
1918     bounds.moveBy([_scrollView contentOffset]);
1919     WebCore::FloatRect contentViewBounds = [_contentView bounds];
1920     bounds.intersect(contentViewBounds);
1921     return bounds;
1922 }
1923
1924 // WebCore stores the page scale factor as float instead of double. When we get a scale from WebCore,
1925 // we need to ignore differences that are within a small rounding error on floats.
1926 static inline bool areEssentiallyEqualAsFloat(float a, float b)
1927 {
1928     return WTF::areEssentiallyEqual(a, b);
1929 }
1930
1931 - (void)_didCommitLayerTreeDuringAnimatedResize:(const WebKit::RemoteLayerTreeTransaction&)layerTreeTransaction
1932 {
1933     auto updateID = layerTreeTransaction.dynamicViewportSizeUpdateID();
1934     if (updateID && *updateID == _currentDynamicViewportSizeUpdateID) {
1935         double pageScale = layerTreeTransaction.pageScaleFactor();
1936         WebCore::IntPoint scrollPosition = layerTreeTransaction.scrollPosition();
1937
1938         CGFloat animatingScaleTarget = [[_resizeAnimationView layer] transform].m11;
1939         double currentTargetScale = animatingScaleTarget * [[_contentView layer] transform].m11;
1940         double scale = pageScale / currentTargetScale;
1941         _resizeAnimationTransformAdjustments = CATransform3DMakeScale(scale, scale, 1);
1942
1943         CGPoint newContentOffset = [self _contentOffsetAdjustedForObscuredInset:CGPointMake(scrollPosition.x() * pageScale, scrollPosition.y() * pageScale)];
1944         CGPoint currentContentOffset = [_scrollView contentOffset];
1945
1946         _resizeAnimationTransformAdjustments.m41 = (currentContentOffset.x - newContentOffset.x) / animatingScaleTarget;
1947         _resizeAnimationTransformAdjustments.m42 = (currentContentOffset.y - newContentOffset.y) / animatingScaleTarget;
1948
1949         [_resizeAnimationView layer].sublayerTransform = _resizeAnimationTransformAdjustments;
1950
1951         // If we've already passed endAnimatedResize, immediately complete
1952         // the resize when we have an up-to-date layer tree. Otherwise,
1953         // we will defer completion until endAnimatedResize.
1954         _waitingForCommitAfterAnimatedResize = NO;
1955         if (!_waitingForEndAnimatedResize)
1956             [self _didCompleteAnimatedResize];
1957
1958         return;
1959     }
1960
1961     // If a commit arrives during the live part of a resize but before the
1962     // layer tree takes the current resize into account, it could change the
1963     // WKContentView's size. Update the resizeAnimationView's scale to ensure
1964     // we continue to fill the width of the resize target.
1965
1966     if (_waitingForEndAnimatedResize)
1967         return;
1968
1969     auto newViewLayoutSize = [self activeViewLayoutSize:self.bounds];
1970     CGFloat resizeAnimationViewScale = _animatedResizeOriginalContentWidth / newViewLayoutSize.width();
1971     [[_resizeAnimationView layer] setSublayerTransform:CATransform3DMakeScale(resizeAnimationViewScale, resizeAnimationViewScale, 1)];
1972 }
1973
1974 - (void)_didCommitLayerTree:(const WebKit::RemoteLayerTreeTransaction&)layerTreeTransaction
1975 {
1976     if (![self usesStandardContentView])
1977         return;
1978
1979     LOG_WITH_STREAM(VisibleRects, stream << "-[WKWebView " << _page->pageID() << " _didCommitLayerTree:] transactionID " <<  layerTreeTransaction.transactionID() << " _dynamicViewportUpdateMode " << (int)_dynamicViewportUpdateMode);
1980
1981     bool needUpdateVisibleContentRects = _page->updateLayoutViewportParameters(layerTreeTransaction);
1982
1983     if (_dynamicViewportUpdateMode != WebKit::DynamicViewportUpdateMode::NotResizing) {
1984         [self _didCommitLayerTreeDuringAnimatedResize:layerTreeTransaction];
1985         return;
1986     }
1987
1988     if (_resizeAnimationView)
1989         RELEASE_LOG_IF_ALLOWED("%p -[WKWebView _didCommitLayerTree:] - dynamicViewportUpdateMode is NotResizing, but still have a live resizeAnimationView (unpaired begin/endAnimatedResize?)", self);
1990
1991     CGSize newContentSize = roundScrollViewContentSize(*_page, [_contentView frame].size);
1992     [_scrollView _setContentSizePreservingContentOffsetDuringRubberband:newContentSize];
1993
1994     [_scrollView setMinimumZoomScale:layerTreeTransaction.minimumScaleFactor()];
1995     [_scrollView setMaximumZoomScale:layerTreeTransaction.maximumScaleFactor()];
1996     [_scrollView setZoomEnabled:layerTreeTransaction.allowsUserScaling()];
1997     if (!layerTreeTransaction.scaleWasSetByUIProcess() && ![_scrollView isZooming] && ![_scrollView isZoomBouncing] && ![_scrollView _isAnimatingZoom] && [_scrollView zoomScale] != layerTreeTransaction.pageScaleFactor()) {
1998         LOG_WITH_STREAM(VisibleRects, stream << " updating scroll view with pageScaleFactor " << layerTreeTransaction.pageScaleFactor());
1999         [_scrollView setZoomScale:layerTreeTransaction.pageScaleFactor()];
2000     }
2001
2002     _viewportMetaTagWidth = layerTreeTransaction.viewportMetaTagWidth();
2003     _viewportMetaTagWidthWasExplicit = layerTreeTransaction.viewportMetaTagWidthWasExplicit();
2004     _viewportMetaTagCameFromImageDocument = layerTreeTransaction.viewportMetaTagCameFromImageDocument();
2005     _initialScaleFactor = layerTreeTransaction.initialScaleFactor();
2006     if (_page->inStableState() && layerTreeTransaction.isInStableState() && [_stableStatePresentationUpdateCallbacks count]) {
2007         for (dispatch_block_t action in _stableStatePresentationUpdateCallbacks.get())
2008             action();
2009
2010         [_stableStatePresentationUpdateCallbacks removeAllObjects];
2011         _stableStatePresentationUpdateCallbacks = nil;
2012     }
2013
2014     if (![_contentView _mayDisableDoubleTapGesturesDuringSingleTap])
2015         [_contentView _setDoubleTapGesturesEnabled:self._allowsDoubleTapGestures];
2016
2017     [self _updateScrollViewBackground];
2018     [self _setAvoidsUnsafeArea:layerTreeTransaction.avoidsUnsafeArea()];
2019
2020     if (_gestureController)
2021         _gestureController->setRenderTreeSize(layerTreeTransaction.renderTreeSize());
2022
2023     if (_needsResetViewStateAfterCommitLoadForMainFrame && layerTreeTransaction.transactionID() >= _firstPaintAfterCommitLoadTransactionID) {
2024         _needsResetViewStateAfterCommitLoadForMainFrame = NO;
2025         [_scrollView setContentOffset:[self _initialContentOffsetForScrollView]];
2026         if (_observedRenderingProgressEvents & _WKRenderingProgressEventFirstPaint)
2027             _navigationState->didFirstPaint();
2028
2029         needUpdateVisibleContentRects = true;
2030     }
2031
2032     if (_firstTransactionIDAfterPageRestore && layerTreeTransaction.transactionID() >= _firstTransactionIDAfterPageRestore.value()) {
2033         if (_scrollOffsetToRestore) {
2034             WebCore::FloatPoint scaledScrollOffset = _scrollOffsetToRestore.value();
2035             _scrollOffsetToRestore = WTF::nullopt;
2036
2037             if (areEssentiallyEqualAsFloat(contentZoomScale(self), _scaleToRestore)) {
2038                 scaledScrollOffset.scale(_scaleToRestore);
2039                 WebCore::FloatPoint contentOffsetInScrollViewCoordinates = scaledScrollOffset - WebCore::FloatSize(_obscuredInsetsWhenSaved.left(), _obscuredInsetsWhenSaved.top());
2040
2041                 changeContentOffsetBoundedInValidRange(_scrollView.get(), contentOffsetInScrollViewCoordinates);
2042                 _commitDidRestoreScrollPosition = YES;
2043             }
2044
2045             needUpdateVisibleContentRects = true;
2046         }
2047
2048         if (_unobscuredCenterToRestore) {
2049             WebCore::FloatPoint unobscuredCenterToRestore = _unobscuredCenterToRestore.value();
2050             _unobscuredCenterToRestore = WTF::nullopt;
2051
2052             if (areEssentiallyEqualAsFloat(contentZoomScale(self), _scaleToRestore)) {
2053                 CGRect unobscuredRect = UIEdgeInsetsInsetRect(self.bounds, _obscuredInsets);
2054                 WebCore::FloatSize unobscuredContentSizeAtNewScale = WebCore::FloatSize(unobscuredRect.size) / _scaleToRestore;
2055                 WebCore::FloatPoint topLeftInDocumentCoordinates = unobscuredCenterToRestore - unobscuredContentSizeAtNewScale / 2;
2056
2057                 topLeftInDocumentCoordinates.scale(_scaleToRestore);
2058                 topLeftInDocumentCoordinates.moveBy(WebCore::FloatPoint(-_obscuredInsets.left, -_obscuredInsets.top));
2059
2060                 changeContentOffsetBoundedInValidRange(_scrollView.get(), topLeftInDocumentCoordinates);
2061             }
2062
2063             needUpdateVisibleContentRects = true;
2064         }
2065
2066         if (_gestureController)
2067             _gestureController->didRestoreScrollPosition();
2068
2069         _firstTransactionIDAfterPageRestore = WTF::nullopt;
2070     }
2071
2072     if (needUpdateVisibleContentRects)
2073         [self _scheduleVisibleContentRectUpdate];
2074
2075     if (WebKit::RemoteLayerTreeScrollingPerformanceData* scrollPerfData = _page->scrollingPerformanceData())
2076         scrollPerfData->didCommitLayerTree([self visibleRectInViewCoordinates]);
2077 }
2078
2079 - (void)_layerTreeCommitComplete
2080 {
2081     _commitDidRestoreScrollPosition = NO;
2082 }
2083
2084 - (void)_couldNotRestorePageState
2085 {
2086     // The gestureController may be waiting for the scroll position to be restored
2087     // in order to remove the swipe snapshot. Since the scroll position could not be
2088     // restored, tell the gestureController it was restored so that it no longer waits
2089     // for it.
2090     if (_gestureController)
2091         _gestureController->didRestoreScrollPosition();
2092 }
2093
2094 - (void)_restorePageScrollPosition:(Optional<WebCore::FloatPoint>)scrollPosition scrollOrigin:(WebCore::FloatPoint)scrollOrigin previousObscuredInset:(WebCore::FloatBoxExtent)obscuredInsets scale:(double)scale
2095 {
2096     if (_dynamicViewportUpdateMode != WebKit::DynamicViewportUpdateMode::NotResizing)
2097         return;
2098
2099     if (![self usesStandardContentView])
2100         return;
2101
2102     _firstTransactionIDAfterPageRestore = downcast<WebKit::RemoteLayerTreeDrawingAreaProxy>(*_page->drawingArea()).nextLayerTreeTransactionID();
2103     if (scrollPosition)
2104         _scrollOffsetToRestore = WebCore::ScrollableArea::scrollOffsetFromPosition(WebCore::FloatPoint(scrollPosition.value()), WebCore::toFloatSize(scrollOrigin));
2105     else
2106         _scrollOffsetToRestore = WTF::nullopt;
2107
2108     _obscuredInsetsWhenSaved = obscuredInsets;
2109     _scaleToRestore = scale;
2110 }
2111
2112 - (void)_restorePageStateToUnobscuredCenter:(Optional<WebCore::FloatPoint>)center scale:(double)scale
2113 {
2114     if (_dynamicViewportUpdateMode != WebKit::DynamicViewportUpdateMode::NotResizing)
2115         return;
2116
2117     if (![self usesStandardContentView])
2118         return;
2119
2120     _firstTransactionIDAfterPageRestore = downcast<WebKit::RemoteLayerTreeDrawingAreaProxy>(*_page->drawingArea()).nextLayerTreeTransactionID();
2121     _unobscuredCenterToRestore = center;
2122
2123     _scaleToRestore = scale;
2124 }
2125
2126 - (RefPtr<WebKit::ViewSnapshot>)_takeViewSnapshot
2127 {
2128 #if HAVE(CORE_ANIMATION_RENDER_SERVER)
2129     float deviceScale = WebCore::screenScaleFactor();
2130     WebCore::FloatSize snapshotSize(self.bounds.size);
2131     snapshotSize.scale(deviceScale);
2132
2133     CATransform3D transform = CATransform3DMakeScale(deviceScale, deviceScale, 1);
2134
2135 #if HAVE(IOSURFACE)
2136     WebCore::IOSurface::Format snapshotFormat = WebCore::screenSupportsExtendedColor() ? WebCore::IOSurface::Format::RGB10 : WebCore::IOSurface::Format::RGBA;
2137     auto surface = WebCore::IOSurface::create(WebCore::expandedIntSize(snapshotSize), WebCore::sRGBColorSpaceRef(), snapshotFormat);
2138     if (!surface)
2139         return nullptr;
2140     CARenderServerRenderLayerWithTransform(MACH_PORT_NULL, self.layer.context.contextId, reinterpret_cast<uint64_t>(self.layer), surface->surface(), 0, 0, &transform);
2141
2142 #if HAVE(IOSURFACE_ACCELERATOR)
2143     WebCore::IOSurface::Format compressedFormat = WebCore::IOSurface::Format::YUV422;
2144     if (WebCore::IOSurface::allowConversionFromFormatToFormat(snapshotFormat, compressedFormat)) {
2145         auto viewSnapshot = WebKit::ViewSnapshot::create(nullptr);
2146         WebCore::IOSurface::convertToFormat(WTFMove(surface), WebCore::IOSurface::Format::YUV422, [viewSnapshot = viewSnapshot.copyRef()](std::unique_ptr<WebCore::IOSurface> convertedSurface) {
2147             if (convertedSurface)
2148                 viewSnapshot->setSurface(WTFMove(convertedSurface));
2149         });
2150
2151         return viewSnapshot;
2152     }
2153 #endif // HAVE(IOSURFACE_ACCELERATOR)
2154
2155     return WebKit::ViewSnapshot::create(WTFMove(surface));
2156 #else // HAVE(IOSURFACE)
2157     uint32_t slotID = [WebKit::ViewSnapshotStore::snapshottingContext() createImageSlot:snapshotSize hasAlpha:YES];
2158
2159     if (!slotID)
2160         return nullptr;
2161
2162     CARenderServerCaptureLayerWithTransform(MACH_PORT_NULL, self.layer.context.contextId, (uint64_t)self.layer, slotID, 0, 0, &transform);
2163     WebCore::IntSize imageSize = WebCore::expandedIntSize(WebCore::FloatSize(snapshotSize));
2164     return WebKit::ViewSnapshot::create(slotID, imageSize, (imageSize.area() * 4).unsafeGet());
2165 #endif // HAVE(IOSURFACE)
2166 #else // HAVE(CORE_ANIMATION_RENDER_SERVER)
2167     return nullptr;
2168 #endif
2169 }
2170
2171 - (void)_zoomToPoint:(WebCore::FloatPoint)point atScale:(double)scale animated:(BOOL)animated
2172 {
2173     CFTimeInterval duration = 0;
2174     CGFloat zoomScale = contentZoomScale(self);
2175
2176     if (animated) {
2177         const double maximumZoomDuration = 0.4;
2178         const double minimumZoomDuration = 0.1;
2179         const double zoomDurationFactor = 0.3;
2180
2181         duration = std::min(fabs(log(zoomScale) - log(scale)) * zoomDurationFactor + minimumZoomDuration, maximumZoomDuration);
2182     }
2183
2184     if (scale != zoomScale)
2185         _page->willStartUserTriggeredZooming();
2186
2187     LOG_WITH_STREAM(VisibleRects, stream << "_zoomToPoint:" << point << " scale: " << scale << " duration:" << duration);
2188
2189     [_scrollView _zoomToCenter:point scale:scale duration:duration];
2190 }
2191
2192 - (void)_zoomToRect:(WebCore::FloatRect)targetRect atScale:(double)scale origin:(WebCore::FloatPoint)origin animated:(BOOL)animated
2193 {
2194     // FIXME: Some of this could be shared with _scrollToRect.
2195     const double visibleRectScaleChange = contentZoomScale(self) / scale;
2196     const WebCore::FloatRect visibleRect([self convertRect:self.bounds toView:self._currentContentView]);
2197     const WebCore::FloatRect unobscuredRect([self _contentRectForUserInteraction]);
2198
2199     const WebCore::FloatSize topLeftObscuredInsetAfterZoom((unobscuredRect.minXMinYCorner() - visibleRect.minXMinYCorner()) * visibleRectScaleChange);
2200     const WebCore::FloatSize bottomRightObscuredInsetAfterZoom((visibleRect.maxXMaxYCorner() - unobscuredRect.maxXMaxYCorner()) * visibleRectScaleChange);
2201
2202     const WebCore::FloatSize unobscuredRectSizeAfterZoom(unobscuredRect.size() * visibleRectScaleChange);
2203
2204     // Center to the target rect.
2205     WebCore::FloatPoint unobscuredRectLocationAfterZoom = targetRect.location() - (unobscuredRectSizeAfterZoom - targetRect.size()) * 0.5;
2206
2207     // Center to the tap point instead in case the target rect won't fit in a direction.
2208     if (targetRect.width() > unobscuredRectSizeAfterZoom.width())
2209         unobscuredRectLocationAfterZoom.setX(origin.x() - unobscuredRectSizeAfterZoom.width() / 2);
2210     if (targetRect.height() > unobscuredRectSizeAfterZoom.height())
2211         unobscuredRectLocationAfterZoom.setY(origin.y() - unobscuredRectSizeAfterZoom.height() / 2);
2212
2213     // We have computed where we want the unobscured rect to be. Now adjust for the obscuring insets.
2214     WebCore::FloatRect visibleRectAfterZoom(unobscuredRectLocationAfterZoom, unobscuredRectSizeAfterZoom);
2215     visibleRectAfterZoom.move(-topLeftObscuredInsetAfterZoom);
2216     visibleRectAfterZoom.expand(topLeftObscuredInsetAfterZoom + bottomRightObscuredInsetAfterZoom);
2217
2218     [self _zoomToPoint:visibleRectAfterZoom.center() atScale:scale animated:animated];
2219 }
2220
2221 static WebCore::FloatPoint constrainContentOffset(WebCore::FloatPoint contentOffset, WebCore::FloatSize contentSize, WebCore::FloatSize unobscuredContentSize)
2222 {
2223     WebCore::FloatSize maximumContentOffset = contentSize - unobscuredContentSize;
2224     return contentOffset.constrainedBetween(WebCore::FloatPoint(), WebCore::FloatPoint(maximumContentOffset));
2225 }
2226
2227 - (void)_scrollToContentScrollPosition:(WebCore::FloatPoint)scrollPosition scrollOrigin:(WebCore::IntPoint)scrollOrigin
2228 {
2229     if (_commitDidRestoreScrollPosition || _dynamicViewportUpdateMode != WebKit::DynamicViewportUpdateMode::NotResizing)
2230         return;
2231
2232     WebCore::FloatPoint contentOffset = WebCore::ScrollableArea::scrollOffsetFromPosition(scrollPosition, toFloatSize(scrollOrigin));
2233
2234     WebCore::FloatPoint scaledOffset = contentOffset;
2235     CGFloat zoomScale = contentZoomScale(self);
2236     scaledOffset.scale(zoomScale);
2237
2238     CGPoint contentOffsetInScrollViewCoordinates = [self _contentOffsetAdjustedForObscuredInset:scaledOffset];
2239     contentOffsetInScrollViewCoordinates = contentOffsetBoundedInValidRange(_scrollView.get(), contentOffsetInScrollViewCoordinates);
2240
2241     [_scrollView _stopScrollingAndZoomingAnimations];
2242
2243     if (!CGPointEqualToPoint(contentOffsetInScrollViewCoordinates, [_scrollView contentOffset]))
2244         [_scrollView setContentOffset:contentOffsetInScrollViewCoordinates];
2245     else {
2246         // If we haven't changed anything, there would not be any VisibleContentRect update sent to the content.
2247         // The WebProcess would keep the invalid contentOffset as its scroll position.
2248         // To synchronize the WebProcess with what is on screen, we send the VisibleContentRect again.
2249         _page->resendLastVisibleContentRects();
2250     }
2251 }
2252
2253 - (BOOL)_scrollToRect:(WebCore::FloatRect)targetRect origin:(WebCore::FloatPoint)origin minimumScrollDistance:(float)minimumScrollDistance
2254 {
2255     WebCore::FloatRect unobscuredContentRect([self _contentRectForUserInteraction]);
2256     WebCore::FloatPoint unobscuredContentOffset = unobscuredContentRect.location();
2257     WebCore::FloatSize contentSize([self._currentContentView bounds].size);
2258
2259     // Center the target rect in the scroll view.
2260     // If the target doesn't fit in the scroll view, center on the gesture location instead.
2261     WebCore::FloatPoint newUnobscuredContentOffset;
2262     if (targetRect.width() <= unobscuredContentRect.width())
2263         newUnobscuredContentOffset.setX(targetRect.x() - (unobscuredContentRect.width() - targetRect.width()) / 2);
2264     else
2265         newUnobscuredContentOffset.setX(origin.x() - unobscuredContentRect.width() / 2);
2266     if (targetRect.height() <= unobscuredContentRect.height())
2267         newUnobscuredContentOffset.setY(targetRect.y() - (unobscuredContentRect.height() - targetRect.height()) / 2);
2268     else
2269         newUnobscuredContentOffset.setY(origin.y() - unobscuredContentRect.height() / 2);
2270     newUnobscuredContentOffset = constrainContentOffset(newUnobscuredContentOffset, contentSize, unobscuredContentRect.size());
2271
2272     if (unobscuredContentOffset == newUnobscuredContentOffset) {
2273         if (targetRect.width() > unobscuredContentRect.width())
2274             newUnobscuredContentOffset.setX(origin.x() - unobscuredContentRect.width() / 2);
2275         if (targetRect.height() > unobscuredContentRect.height())
2276             newUnobscuredContentOffset.setY(origin.y() - unobscuredContentRect.height() / 2);
2277         newUnobscuredContentOffset = constrainContentOffset(newUnobscuredContentOffset, contentSize, unobscuredContentRect.size());
2278     }
2279
2280     WebCore::FloatSize scrollViewOffsetDelta = newUnobscuredContentOffset - unobscuredContentOffset;
2281     scrollViewOffsetDelta.scale(contentZoomScale(self));
2282
2283     float scrollDistance = scrollViewOffsetDelta.diagonalLength();
2284     if (scrollDistance < minimumScrollDistance)
2285         return false;
2286
2287     [_contentView willStartZoomOrScroll];
2288
2289     LOG_WITH_STREAM(VisibleRects, stream << "_scrollToRect: scrolling to " << [_scrollView contentOffset] + scrollViewOffsetDelta);
2290
2291     [_scrollView setContentOffset:([_scrollView contentOffset] + scrollViewOffsetDelta) animated:YES];
2292     return true;
2293 }
2294
2295 - (void)_zoomOutWithOrigin:(WebCore::FloatPoint)origin animated:(BOOL)animated
2296 {
2297     [self _zoomToPoint:origin atScale:[_scrollView minimumZoomScale] animated:animated];
2298 }
2299
2300 - (void)_zoomToInitialScaleWithOrigin:(WebCore::FloatPoint)origin animated:(BOOL)animated
2301 {
2302     ASSERT(_initialScaleFactor > 0);
2303     [self _zoomToPoint:origin atScale:_initialScaleFactor animated:animated];
2304 }
2305
2306 // focusedElementRect and selectionRect are both in document coordinates.
2307 - (void)_zoomToFocusRect:(const WebCore::FloatRect&)focusedElementRectInDocumentCoordinates selectionRect:(const WebCore::FloatRect&)selectionRectInDocumentCoordinates insideFixed:(BOOL)insideFixed
2308     fontSize:(float)fontSize minimumScale:(double)minimumScale maximumScale:(double)maximumScale allowScaling:(BOOL)allowScaling forceScroll:(BOOL)forceScroll
2309 {
2310     LOG_WITH_STREAM(VisibleRects, stream << "_zoomToFocusRect:" << focusedElementRectInDocumentCoordinates << " selectionRect:" << selectionRectInDocumentCoordinates);
2311     UNUSED_PARAM(insideFixed);
2312
2313     const double minimumHeightToShowContentAboveKeyboard = 106;
2314     const CFTimeInterval formControlZoomAnimationDuration = 0.25;
2315     const double caretOffsetFromWindowEdge = 8;
2316
2317     UIWindow *window = [_scrollView window];
2318
2319     // Find the portion of the view that is visible on the screen.
2320     UIViewController *topViewController = [[[_scrollView _viewControllerForAncestor] _rootAncestorViewController] _viewControllerForSupportedInterfaceOrientations];
2321     UIView *fullScreenView = topViewController.view;
2322     if (!fullScreenView)
2323         fullScreenView = window;
2324
2325     CGRect unobscuredScrollViewRectInWebViewCoordinates = UIEdgeInsetsInsetRect([self bounds], _obscuredInsets);
2326     CGRect visibleScrollViewBoundsInWebViewCoordinates = CGRectIntersection(unobscuredScrollViewRectInWebViewCoordinates, [fullScreenView convertRect:[fullScreenView bounds] toView:self]);
2327     CGRect formAssistantFrameInWebViewCoordinates = [window convertRect:_inputViewBounds toView:self];
2328     CGRect intersectionBetweenScrollViewAndFormAssistant = CGRectIntersection(visibleScrollViewBoundsInWebViewCoordinates, formAssistantFrameInWebViewCoordinates);
2329     CGSize visibleSize = visibleScrollViewBoundsInWebViewCoordinates.size;
2330
2331     CGFloat visibleOffsetFromTop = 0;
2332     if (!CGRectIsEmpty(intersectionBetweenScrollViewAndFormAssistant)) {
2333         CGFloat heightVisibleAboveFormAssistant = CGRectGetMinY(intersectionBetweenScrollViewAndFormAssistant) - CGRectGetMinY(visibleScrollViewBoundsInWebViewCoordinates);
2334         CGFloat heightVisibleBelowFormAssistant = CGRectGetMaxY(visibleScrollViewBoundsInWebViewCoordinates) - CGRectGetMaxY(intersectionBetweenScrollViewAndFormAssistant);
2335
2336         if (heightVisibleAboveFormAssistant >= minimumHeightToShowContentAboveKeyboard || heightVisibleBelowFormAssistant < heightVisibleAboveFormAssistant)
2337             visibleSize.height = heightVisibleAboveFormAssistant;
2338         else {
2339             visibleSize.height = heightVisibleBelowFormAssistant;
2340             visibleOffsetFromTop = CGRectGetMaxY(intersectionBetweenScrollViewAndFormAssistant) - CGRectGetMinY(visibleScrollViewBoundsInWebViewCoordinates);
2341         }
2342     }
2343
2344     // Zoom around the element's bounding frame. We use a "standard" size to determine the proper frame.
2345     double currentScale = contentZoomScale(self);
2346     double scale = currentScale;
2347     if (allowScaling) {
2348 #if PLATFORM(WATCHOS)
2349         const CGFloat minimumMarginForZoomingToEntireFocusRectInWebViewCoordinates = 10;
2350         const CGFloat maximumMarginForZoomingToEntireFocusRectInWebViewCoordinates = 35;
2351
2352         CGRect minimumTargetRectInDocumentCoordinates = UIRectInsetEdges(focusedElementRectInDocumentCoordinates, UIRectEdgeAll, -minimumMarginForZoomingToEntireFocusRectInWebViewCoordinates / currentScale);
2353         CGRect maximumTargetRectInDocumentCoordinates = UIRectInsetEdges(focusedElementRectInDocumentCoordinates, UIRectEdgeAll, -maximumMarginForZoomingToEntireFocusRectInWebViewCoordinates / currentScale);
2354
2355         double clampedMaximumTargetScale = clampTo<double>(std::min(visibleSize.width / CGRectGetWidth(minimumTargetRectInDocumentCoordinates), visibleSize.height / CGRectGetHeight(minimumTargetRectInDocumentCoordinates)), minimumScale, maximumScale);
2356         double clampedMinimumTargetScale = clampTo<double>(std::min(visibleSize.width / CGRectGetWidth(maximumTargetRectInDocumentCoordinates), visibleSize.height / CGRectGetHeight(maximumTargetRectInDocumentCoordinates)), minimumScale, maximumScale);
2357         scale = clampTo<double>(currentScale, clampedMinimumTargetScale, clampedMaximumTargetScale);
2358 #else
2359         const double webViewStandardFontSize = 16;
2360         scale = clampTo<double>(webViewStandardFontSize / fontSize, minimumScale, maximumScale);
2361 #endif
2362     }
2363
2364     CGFloat documentWidth = [_contentView bounds].size.width;
2365     scale = CGRound(documentWidth * scale) / documentWidth;
2366
2367     WebCore::FloatRect focusedElementRectInNewScale = focusedElementRectInDocumentCoordinates;
2368     focusedElementRectInNewScale.scale(scale);
2369     focusedElementRectInNewScale.moveBy([_contentView frame].origin);
2370
2371     BOOL selectionRectIsNotNull = !selectionRectInDocumentCoordinates.isZero();
2372     if (!forceScroll) {
2373         CGRect currentlyVisibleRegionInWebViewCoordinates;
2374         currentlyVisibleRegionInWebViewCoordinates.origin = unobscuredScrollViewRectInWebViewCoordinates.origin;
2375         currentlyVisibleRegionInWebViewCoordinates.origin.y += visibleOffsetFromTop;
2376         currentlyVisibleRegionInWebViewCoordinates.size = visibleSize;
2377
2378         // Don't bother scrolling if the entire node is already visible, whether or not we got a selectionRect.
2379         if (CGRectContainsRect(currentlyVisibleRegionInWebViewCoordinates, [self convertRect:focusedElementRectInDocumentCoordinates fromView:_contentView.get()]))
2380             return;
2381
2382         // Don't bother scrolling if we have a valid selectionRect and it is already visible.
2383         if (selectionRectIsNotNull && CGRectContainsRect(currentlyVisibleRegionInWebViewCoordinates, [self convertRect:selectionRectInDocumentCoordinates fromView:_contentView.get()]))
2384             return;
2385     }
2386
2387     // We want to center the focused element within the viewport, with as much spacing on all sides as
2388     // we can get based on the visible area after zooming. The spacing in either dimension is half the
2389     // difference between the size of the DOM node and the size of the visible frame.
2390     // If the element is too wide to be horizontally centered or too tall to be vertically centered, we
2391     // instead scroll such that the left edge or top edge of the element is within the left half or top
2392     // half of the viewport, respectively.
2393     CGFloat horizontalSpaceInWebViewCoordinates = (visibleSize.width - focusedElementRectInNewScale.width()) / 2.0;
2394     CGFloat verticalSpaceInWebViewCoordinates = (visibleSize.height - focusedElementRectInNewScale.height()) / 2.0;
2395
2396     auto topLeft = CGPointZero;
2397     auto scrollViewInsets = [_scrollView _effectiveContentInset];
2398     auto currentTopLeft = [_scrollView contentOffset];
2399
2400     if (_haveSetObscuredInsets) {
2401         currentTopLeft.x += _obscuredInsets.left;
2402         currentTopLeft.y += _obscuredInsets.top;
2403     }
2404
2405     if (horizontalSpaceInWebViewCoordinates > 0)
2406         topLeft.x = focusedElementRectInNewScale.x() - horizontalSpaceInWebViewCoordinates;
2407     else {
2408         auto minimumOffsetToRevealLeftEdge = std::max(-scrollViewInsets.left, focusedElementRectInNewScale.x() - visibleSize.width / 2);
2409         auto maximumOffsetToRevealLeftEdge = focusedElementRectInNewScale.x();
2410         topLeft.x = clampTo<double>(currentTopLeft.x, minimumOffsetToRevealLeftEdge, maximumOffsetToRevealLeftEdge);
2411     }
2412
2413     if (verticalSpaceInWebViewCoordinates > 0)
2414         topLeft.y = focusedElementRectInNewScale.y() - verticalSpaceInWebViewCoordinates;
2415     else {
2416         auto minimumOffsetToRevealTopEdge = std::max(-scrollViewInsets.top, focusedElementRectInNewScale.y() - visibleSize.height / 2);
2417         auto maximumOffsetToRevealTopEdge = focusedElementRectInNewScale.y();
2418         topLeft.y = clampTo<double>(currentTopLeft.y, minimumOffsetToRevealTopEdge, maximumOffsetToRevealTopEdge);
2419     }
2420
2421     topLeft.y -= visibleOffsetFromTop;
2422
2423     WebCore::FloatRect documentBoundsInNewScale = [_contentView bounds];
2424     documentBoundsInNewScale.scale(scale);
2425     documentBoundsInNewScale.moveBy([_contentView frame].origin);
2426
2427     CGFloat minimumAllowableHorizontalOffsetInWebViewCoordinates = -INFINITY;
2428     CGFloat minimumAllowableVerticalOffsetInWebViewCoordinates = -INFINITY;
2429     CGFloat maximumAllowableHorizontalOffsetInWebViewCoordinates = CGRectGetMaxX(documentBoundsInNewScale) - visibleSize.width;
2430     CGFloat maximumAllowableVerticalOffsetInWebViewCoordinates = CGRectGetMaxY(documentBoundsInNewScale) - visibleSize.height;
2431
2432     if (selectionRectIsNotNull) {
2433         WebCore::FloatRect selectionRectInNewScale = selectionRectInDocumentCoordinates;
2434         selectionRectInNewScale.scale(scale);
2435         selectionRectInNewScale.moveBy([_contentView frame].origin);
2436         // Adjust the min and max allowable scroll offsets, such that the selection rect remains visible.
2437         minimumAllowableHorizontalOffsetInWebViewCoordinates = CGRectGetMaxX(selectionRectInNewScale) + caretOffsetFromWindowEdge - visibleSize.width;
2438         minimumAllowableVerticalOffsetInWebViewCoordinates = CGRectGetMaxY(selectionRectInNewScale) + caretOffsetFromWindowEdge - visibleSize.height - visibleOffsetFromTop;
2439         maximumAllowableHorizontalOffsetInWebViewCoordinates = std::min<CGFloat>(maximumAllowableHorizontalOffsetInWebViewCoordinates, CGRectGetMinX(selectionRectInNewScale) - caretOffsetFromWindowEdge);
2440         maximumAllowableVerticalOffsetInWebViewCoordinates = std::min<CGFloat>(maximumAllowableVerticalOffsetInWebViewCoordinates, CGRectGetMinY(selectionRectInNewScale) - caretOffsetFromWindowEdge - visibleOffsetFromTop);
2441     }
2442
2443     // Constrain the left edge in document coordinates so that:
2444     //  - it isn't so small that the scrollVisibleRect isn't visible on the screen
2445     //  - it isn't so great that the document's right edge is less than the right edge of the screen
2446     topLeft.x = clampTo<CGFloat>(topLeft.x, minimumAllowableHorizontalOffsetInWebViewCoordinates, maximumAllowableHorizontalOffsetInWebViewCoordinates);
2447
2448     // Constrain the top edge in document coordinates so that:
2449     //  - it isn't so small that the scrollVisibleRect isn't visible on the screen
2450     //  - it isn't so great that the document's bottom edge is higher than the top of the form assistant
2451     topLeft.y = clampTo<CGFloat>(topLeft.y, minimumAllowableVerticalOffsetInWebViewCoordinates, maximumAllowableVerticalOffsetInWebViewCoordinates);
2452
2453     if (_haveSetObscuredInsets) {
2454         // This looks unintuitive, but is necessary in order to precisely center the focused element in the visible area.
2455         // The top left position already accounts for top and left obscured insets - i.e., a topLeft of (0, 0) corresponds
2456         // to the top- and left-most point below (and to the right of) the top inset area and left inset areas, respectively.
2457         // However, when telling WKScrollView to scroll to a given center position, this center position is computed relative
2458         // to the coordinate space of the scroll view. Thus, to compute our center position from the top left position, we
2459         // need to first move the top left position up and to the left, and then add half the width and height of the content
2460         // area (including obscured insets).
2461         topLeft.x -= _obscuredInsets.left;
2462         topLeft.y -= _obscuredInsets.top;
2463     }
2464
2465     WebCore::FloatPoint newCenter = CGPointMake(topLeft.x + CGRectGetWidth(self.bounds) / 2, topLeft.y + CGRectGetHeight(self.bounds) / 2);
2466
2467     if (scale != currentScale)
2468         _page->willStartUserTriggeredZooming();
2469
2470     LOG_WITH_STREAM(VisibleRects, stream << "_zoomToFocusRect: zooming to " << newCenter << " scale:" << scale);
2471
2472     // The newCenter has been computed in the new scale, but _zoomToCenter expected the center to be in the original scale.
2473     newCenter.scale(1 / scale);
2474     [_scrollView _zoomToCenter:newCenter scale:scale duration:formControlZoomAnimationDuration force:YES];
2475 }
2476
2477 - (double)_initialScaleFactor
2478 {
2479     return _initialScaleFactor;
2480 }
2481
2482 - (double)_contentZoomScale
2483 {
2484     return contentZoomScale(self);
2485 }
2486
2487 - (double)_targetContentZoomScaleForRect:(const WebCore::FloatRect&)targetRect currentScale:(double)currentScale fitEntireRect:(BOOL)fitEntireRect minimumScale:(double)minimumScale maximumScale:(double)maximumScale
2488 {
2489     WebCore::FloatSize unobscuredContentSize([self _contentRectForUserInteraction].size);
2490     double horizontalScale = unobscuredContentSize.width() * currentScale / targetRect.width();
2491     double verticalScale = unobscuredContentSize.height() * currentScale / targetRect.height();
2492
2493     horizontalScale = std::min(std::max(horizontalScale, minimumScale), maximumScale);
2494     verticalScale = std::min(std::max(verticalScale, minimumScale), maximumScale);
2495
2496     return fitEntireRect ? std::min(horizontalScale, verticalScale) : horizontalScale;
2497 }
2498
2499 - (BOOL)_zoomToRect:(WebCore::FloatRect)targetRect withOrigin:(WebCore::FloatPoint)origin fitEntireRect:(BOOL)fitEntireRect minimumScale:(double)minimumScale maximumScale:(double)maximumScale minimumScrollDistance:(float)minimumScrollDistance
2500 {
2501     const float maximumScaleFactorDeltaForPanScroll = 0.02;
2502
2503     double currentScale = contentZoomScale(self);
2504     double targetScale = [self _targetContentZoomScaleForRect:targetRect currentScale:currentScale fitEntireRect:fitEntireRect minimumScale:minimumScale maximumScale:maximumScale];
2505
2506     if (fabs(targetScale - currentScale) < maximumScaleFactorDeltaForPanScroll) {
2507         if ([self _scrollToRect:targetRect origin:origin minimumScrollDistance:minimumScrollDistance])
2508             return true;
2509     } else if (targetScale != currentScale) {
2510         [self _zoomToRect:targetRect atScale:targetScale origin:origin animated:YES];
2511         return true;
2512     }
2513
2514     return false;
2515 }
2516
2517 - (void)didMoveToWindow
2518 {
2519     _page->activityStateDidChange(WebCore::ActivityState::allFlags());
2520     _page->webViewDidMoveToWindow();
2521 }
2522
2523 - (void)setOpaque:(BOOL)opaque
2524 {
2525     BOOL oldOpaque = self.opaque;
2526
2527     [super setOpaque:opaque];
2528     [_contentView setOpaque:opaque];
2529
2530     if (oldOpaque == opaque)
2531         return;
2532
2533     if (!_page)
2534         return;
2535
2536     Optional<WebCore::Color> backgroundColor;
2537     if (!opaque)
2538         backgroundColor = WebCore::Color(WebCore::Color::transparent);
2539     _page->setBackgroundColor(backgroundColor);
2540     [self _updateScrollViewBackground];
2541 }
2542
2543 - (void)setBackgroundColor:(UIColor *)backgroundColor
2544 {
2545     [super setBackgroundColor:backgroundColor];
2546     [_contentView setBackgroundColor:backgroundColor];
2547     [self _updateScrollViewBackground];
2548 }
2549
2550 - (BOOL)_allowsDoubleTapGestures
2551 {
2552     if (_fastClickingIsDisabled)
2553         return YES;
2554
2555     // If the page is not user scalable, we don't allow double tap gestures.
2556     if (![_scrollView isZoomEnabled] || [_scrollView minimumZoomScale] >= [_scrollView maximumZoomScale])
2557         return NO;
2558
2559     // If the viewport width was not explicit, we allow double tap gestures.
2560     if (!_viewportMetaTagWidthWasExplicit || _viewportMetaTagCameFromImageDocument)
2561         return YES;
2562
2563     // If the page set a viewport width that wasn't the device width, then it was
2564     // scaled and thus will probably need to zoom.
2565     if (_viewportMetaTagWidth != WebCore::ViewportArguments::ValueDeviceWidth)
2566         return YES;
2567
2568     // At this point, we have a page that asked for width = device-width. However,
2569     // if the content's width and height were large, we might have had to shrink it.
2570     // We'll enable double tap zoom whenever we're not at the actual initial scale.
2571     return !areEssentiallyEqualAsFloat(contentZoomScale(self), _initialScaleFactor);
2572 }
2573
2574 - (BOOL)_stylusTapGestureShouldCreateEditableImage
2575 {
2576     return [_configuration _editableImagesEnabled];
2577 }
2578
2579 #pragma mark - UIScrollViewDelegate
2580
2581 - (BOOL)usesStandardContentView
2582 {
2583     return !_customContentView && !_passwordView;
2584 }
2585
2586 - (CGSize)scrollView:(UIScrollView*)scrollView contentSizeForZoomScale:(CGFloat)scale withProposedSize:(CGSize)proposedSize
2587 {
2588     return roundScrollViewContentSize(*_page, proposedSize);
2589 }
2590
2591 - (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
2592 {
2593     ASSERT(_scrollView == scrollView);
2594     return self._currentContentView;
2595 }
2596
2597 - (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view
2598 {
2599     if (![self usesStandardContentView]) {
2600         if ([_customContentView respondsToSelector:@selector(web_scrollViewWillBeginZooming:withView:)])
2601             [_customContentView web_scrollViewWillBeginZooming:scrollView withView:view];
2602         return;
2603     }
2604
2605     if (scrollView.pinchGestureRecognizer.state == UIGestureRecognizerStateBegan) {
2606         _page->willStartUserTriggeredZooming();
2607         [_contentView scrollViewWillStartPanOrPinchGesture];
2608     }
2609     [_contentView willStartZoomOrScroll];
2610
2611 #if ENABLE(POINTER_EVENTS)
2612     [_contentView cancelPointersForGestureRecognizer:scrollView.pinchGestureRecognizer];
2613 #endif
2614 }
2615
2616 - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
2617 {
2618     if (![self usesStandardContentView])
2619         return;
2620
2621     if (scrollView.panGestureRecognizer.state == UIGestureRecognizerStateBegan)
2622         [_contentView scrollViewWillStartPanOrPinchGesture];
2623
2624     [_contentView willStartZoomOrScroll];
2625 #if ENABLE(CSS_SCROLL_SNAP) && ENABLE(ASYNC_SCROLLING)
2626     // FIXME: We will want to detect whether snapping will occur before beginning to drag. See WebPageProxy::didCommitLayerTree.
2627     WebKit::RemoteScrollingCoordinatorProxy* coordinator = _page->scrollingCoordinatorProxy();
2628     ASSERT(scrollView == _scrollView.get());
2629     CGFloat scrollDecelerationFactor = (coordinator && coordinator->shouldSetScrollViewDecelerationRateFast()) ? UIScrollViewDecelerationRateFast : UIScrollViewDecelerationRateNormal;
2630     scrollView.horizontalScrollDecelerationFactor = scrollDecelerationFactor;
2631     scrollView.verticalScrollDecelerationFactor = scrollDecelerationFactor;
2632 #endif
2633 }
2634
2635 - (void)_didFinishScrolling
2636 {
2637     if (![self usesStandardContentView])
2638         return;
2639
2640     [self _scheduleVisibleContentRectUpdate];
2641     [_contentView didFinishScrolling];
2642 }
2643
2644 - (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset
2645 {
2646     // Work around <rdar://problem/16374753> by avoiding deceleration while
2647     // zooming. We'll animate to the right place once the zoom finishes.
2648     if ([scrollView isZooming])
2649         *targetContentOffset = [scrollView contentOffset];
2650 #if ENABLE(POINTER_EVENTS)
2651     else {
2652         if ([_contentView preventsPanningInXAxis])
2653             targetContentOffset->x = scrollView.contentOffset.x;
2654         if ([_contentView preventsPanningInYAxis])
2655             targetContentOffset->y = scrollView.contentOffset.y;
2656     }
2657 #endif
2658 #if ENABLE(CSS_SCROLL_SNAP) && ENABLE(ASYNC_SCROLLING)
2659     if (WebKit::RemoteScrollingCoordinatorProxy* coordinator = _page->scrollingCoordinatorProxy()) {
2660         // FIXME: Here, I'm finding the maximum horizontal/vertical scroll offsets. There's probably a better way to do this.
2661         CGSize maxScrollOffsets = CGSizeMake(scrollView.contentSize.width - scrollView.bounds.size.width, scrollView.contentSize.height - scrollView.bounds.size.height);
2662
2663         UIEdgeInsets obscuredInset;
2664
2665         id<WKUIDelegatePrivate> uiDelegatePrivate = static_cast<id <WKUIDelegatePrivate>>([self UIDelegate]);
2666         if ([uiDelegatePrivate respondsToSelector:@selector(_webView:finalObscuredInsetsForScrollView:withVelocity:targetContentOffset:)])
2667             obscuredInset = [uiDelegatePrivate _webView:self finalObscuredInsetsForScrollView:scrollView withVelocity:velocity targetContentOffset:targetContentOffset];
2668         else
2669             obscuredInset = [self _computedObscuredInset];
2670
2671         CGRect unobscuredRect = UIEdgeInsetsInsetRect(self.bounds, obscuredInset);
2672
2673         coordinator->adjustTargetContentOffsetForSnapping(maxScrollOffsets, velocity, unobscuredRect.origin.y, targetContentOffset);
2674     }
2675 #endif
2676 }
2677
2678 - (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
2679 {
2680     // If we're decelerating, scroll offset will be updated when scrollViewDidFinishDecelerating: is called.
2681     if (!decelerate)
2682         [self _didFinishScrolling];
2683 }
2684
2685 - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
2686 {
2687     [self _didFinishScrolling];
2688 }
2689
2690 - (void)scrollViewDidScrollToTop:(UIScrollView *)scrollView
2691 {
2692     [self _didFinishScrolling];
2693 }
2694
2695 #if ENABLE(POINTER_EVENTS)
2696 - (CGPoint)_scrollView:(UIScrollView *)scrollView adjustedOffsetForOffset:(CGPoint)offset translation:(CGPoint)translation startPoint:(CGPoint)start locationInView:(CGPoint)locationInView horizontalVelocity:(inout double *)hv verticalVelocity:(inout double *)vv
2697 {
2698     if (![_contentView preventsPanningInXAxis] && ![_contentView preventsPanningInYAxis]) {
2699         [_contentView cancelPointersForGestureRecognizer:scrollView.panGestureRecognizer];
2700         return offset;
2701     }
2702
2703     CGPoint adjustedContentOffset = CGPointMake(offset.x, offset.y);
2704     if ([_contentView preventsPanningInXAxis])
2705         adjustedContentOffset.x = start.x;
2706     if ([_contentView preventsPanningInYAxis])
2707         adjustedContentOffset.y = start.y;
2708
2709     if ((![_contentView preventsPanningInXAxis] && adjustedContentOffset.x != start.x)
2710         || (![_contentView preventsPanningInYAxis] && adjustedContentOffset.y != start.y)) {
2711         [_contentView cancelPointersForGestureRecognizer:scrollView.panGestureRecognizer];
2712     }
2713
2714     return adjustedContentOffset;
2715 }
2716 #endif
2717
2718 - (void)scrollViewDidScroll:(UIScrollView *)scrollView
2719 {
2720     if (![self usesStandardContentView] && [_customContentView respondsToSelector:@selector(web_scrollViewDidScroll:)])
2721         [_customContentView web_scrollViewDidScroll:(UIScrollView *)scrollView];
2722
2723     [self _scheduleVisibleContentRectUpdateAfterScrollInView:scrollView];
2724
2725     if (WebKit::RemoteLayerTreeScrollingPerformanceData* scrollPerfData = _page->scrollingPerformanceData())
2726         scrollPerfData->didScroll([self visibleRectInViewCoordinates]);
2727 }
2728
2729 - (void)scrollViewDidZoom:(UIScrollView *)scrollView
2730 {
2731     if (![self usesStandardContentView] && [_customContentView respondsToSelector:@selector(web_scrollViewDidZoom:)])
2732         [_customContentView web_scrollViewDidZoom:scrollView];
2733
2734     [self _updateScrollViewBackground];
2735     [self _scheduleVisibleContentRectUpdateAfterScrollInView:scrollView];
2736 }
2737
2738 - (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale
2739 {
2740     if (![self usesStandardContentView] && [_customContentView respondsToSelector:@selector(web_scrollViewDidEndZooming:withView:atScale:)])
2741         [_customContentView web_scrollViewDidEndZooming:scrollView withView:view atScale:scale];
2742
2743     ASSERT(scrollView == _scrollView);
2744     // FIXME: remove when rdar://problem/36065495 is fixed.
2745     // When rotating with two fingers down, UIScrollView can set a bogus content view position.
2746     // "Center" is top left because we set the anchorPoint to 0,0.
2747     [_contentView setCenter:self.bounds.origin];
2748
2749     [self _scheduleVisibleContentRectUpdateAfterScrollInView:scrollView];
2750     [_contentView didZoomToScale:scale];
2751 }
2752
2753 - (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView
2754 {
2755     [self _didFinishScrolling];
2756 }
2757
2758 - (void)_scrollViewDidInterruptDecelerating:(UIScrollView *)scrollView
2759 {
2760     if (![self usesStandardContentView])
2761         return;
2762
2763     [_contentView didInterruptScrolling];
2764     [self _scheduleVisibleContentRectUpdateAfterScrollInView:scrollView];
2765 }
2766
2767 - (UIView *)_enclosingViewForExposedRectComputation
2768 {
2769     return [self _scroller];
2770 }
2771
2772 - (CGRect)_visibleRectInEnclosingView:(UIView *)enclosingView
2773 {
2774     if (!enclosingView)
2775         return self.bounds;
2776
2777     CGRect exposedRect = [enclosingView convertRect:enclosingView.bounds toView:self];
2778     return CGRectIntersectsRect(exposedRect, self.bounds) ? CGRectIntersection(exposedRect, self.bounds) : CGRectZero;
2779 }
2780
2781 - (CGRect)_visibleContentRect
2782 {
2783     if (_frozenVisibleContentRect)
2784         return _frozenVisibleContentRect.value();
2785
2786     CGRect visibleRectInContentCoordinates = [self convertRect:self.bounds toView:_contentView.get()];
2787
2788     if (UIView *enclosingView = [self _enclosingViewForExposedRectComputation]) {
2789         CGRect viewVisibleRect = [self _visibleRectInEnclosingView:enclosingView];
2790         CGRect viewVisibleContentRect = [self convertRect:viewVisibleRect toView:_contentView.get()];
2791         visibleRectInContentCoordinates = CGRectIntersection(visibleRectInContentCoordinates, viewVisibleContentRect);
2792     }
2793
2794     return visibleRectInContentCoordinates;
2795 }
2796
2797 // Called when some ancestor UIScrollView scrolls.
2798 - (void)_didScroll
2799 {
2800     [self _scheduleVisibleContentRectUpdateAfterScrollInView:[self _scroller]];
2801
2802     const NSTimeInterval ScrollingEndedTimerInterval = 0.032;
2803     if (!_enclosingScrollViewScrollTimer) {
2804         _enclosingScrollViewScrollTimer = adoptNS([[NSTimer alloc] initWithFireDate:[NSDate dateWithTimeIntervalSinceNow:ScrollingEndedTimerInterval]
2805             interval:0 target:self selector:@selector(_enclosingScrollerScrollingEnded:) userInfo:nil repeats:YES]);
2806         [[NSRunLoop mainRunLoop] addTimer:_enclosingScrollViewScrollTimer.get() forMode:NSDefaultRunLoopMode];
2807     }
2808     _didScrollSinceLastTimerFire = YES;
2809 }
2810
2811 - (void)_enclosingScrollerScrollingEnded:(NSTimer *)timer
2812 {
2813     if (_didScrollSinceLastTimerFire) {
2814         _didScrollSinceLastTimerFire = NO;
2815         return;
2816     }
2817
2818     [self _scheduleVisibleContentRectUpdate];
2819     [_enclosingScrollViewScrollTimer invalidate];
2820     _enclosingScrollViewScrollTimer = nil;
2821 }
2822
2823 - (UIEdgeInsets)_scrollViewSystemContentInset
2824 {
2825     // It's not safe to access the scroll view's safeAreaInsets or _systemContentInset from
2826     // inside our layoutSubviews implementation, because they aren't updated until afterwards.
2827     // Instead, depend on the fact that the UIScrollView and WKWebView are in the same coordinate
2828     // space, and map the WKWebView's own insets into the scroll view manually.
2829     return UIEdgeInsetsAdd([_scrollView _contentScrollInset], self.safeAreaInsets, [_scrollView _edgesApplyingSafeAreaInsetsToContentInset]);
2830 }
2831
2832 - (WebCore::FloatSize)activeViewLayoutSize:(const CGRect&)bounds
2833 {
2834     if (_overridesViewLayoutSize)
2835         return WebCore::FloatSize(_viewLayoutSizeOverride);
2836
2837 #if __IPHONE_OS_VERSION_MIN_REQUIRED >= 110000
2838     return WebCore::FloatSize(UIEdgeInsetsInsetRect(CGRectMake(0, 0, bounds.size.width, bounds.size.height), self._scrollViewSystemContentInset).size);
2839 #else
2840     return WebCore::FloatSize { bounds.size };
2841 #endif
2842 }
2843
2844 - (void)_dispatchSetViewLayoutSize:(WebCore::FloatSize)viewLayoutSize
2845 {
2846     if (_lastSentViewLayoutSize && CGSizeEqualToSize(_lastSentViewLayoutSize.value(), viewLayoutSize))
2847         return;
2848
2849     LOG_WITH_STREAM(VisibleRects, stream << "-[WKWebView " << _page->pageID() << " _dispatchSetViewLayoutSize:] " << viewLayoutSize << " contentZoomScale " << contentZoomScale(self));
2850     _page->setViewportConfigurationViewLayoutSize(viewLayoutSize, _page->layoutSizeScaleFactor(), _page->minimumEffectiveDeviceWidth());
2851     _lastSentViewLayoutSize = viewLayoutSize;
2852 }
2853
2854 - (void)_dispatchSetMaximumUnobscuredSize:(WebCore::FloatSize)maximumUnobscuredSize
2855 {
2856     if (_lastSentMaximumUnobscuredSize && CGSizeEqualToSize(_lastSentMaximumUnobscuredSize.value(), maximumUnobscuredSize))
2857         return;
2858
2859     _page->setMaximumUnobscuredSize(maximumUnobscuredSize);
2860     _lastSentMaximumUnobscuredSize = maximumUnobscuredSize;
2861 }
2862
2863 - (void)_dispatchSetDeviceOrientation:(int32_t)deviceOrientation
2864 {
2865     if (_lastSentDeviceOrientation && _lastSentDeviceOrientation.value() == deviceOrientation)
2866         return;
2867
2868     _page->setDeviceOrientation(deviceOrientation);
2869     _lastSentDeviceOrientation = deviceOrientation;
2870 }
2871
2872 - (void)_frameOrBoundsChanged
2873 {
2874     CGRect bounds = self.bounds;
2875     [_scrollView setFrame:bounds];
2876
2877     if (_dynamicViewportUpdateMode == WebKit::DynamicViewportUpdateMode::NotResizing) {
2878         if (!_overridesViewLayoutSize)
2879             [self _dispatchSetViewLayoutSize:[self activeViewLayoutSize:self.bounds]];
2880         if (!_overridesMaximumUnobscuredSize)
2881             [self _dispatchSetMaximumUnobscuredSize:WebCore::FloatSize(bounds.size)];
2882
2883         BOOL sizeChanged = NO;
2884         if (auto drawingArea = _page->drawingArea())
2885             sizeChanged = drawingArea->setSize(WebCore::IntSize(bounds.size));
2886
2887         if (sizeChanged & [self usesStandardContentView])
2888             [_contentView setSizeChangedSinceLastVisibleContentRectUpdate:YES];
2889     }
2890
2891     [_customContentView web_setMinimumSize:bounds.size];
2892     [self _scheduleVisibleContentRectUpdate];
2893 }
2894
2895 // Unobscured content rect where the user can interact. When the keyboard is up, this should be the area above or below the keyboard, wherever there is enough space.
2896 - (CGRect)_contentRectForUserInteraction
2897 {
2898     // FIXME: handle split keyboard.
2899     UIEdgeInsets obscuredInsets = _obscuredInsets;
2900     obscuredInsets.bottom = std::max(_obscuredInsets.bottom, _inputViewBounds.size.height);
2901     CGRect unobscuredRect = UIEdgeInsetsInsetRect(self.bounds, obscuredInsets);
2902     return [self convertRect:unobscuredRect toView:self._currentContentView];
2903 }
2904
2905 // Ideally UIScrollView would expose this for us: <rdar://problem/21394567>.
2906 - (BOOL)_scrollViewIsRubberBanding
2907 {
2908     float deviceScaleFactor = _page->deviceScaleFactor();
2909
2910     CGPoint contentOffset = [_scrollView contentOffset];
2911     CGPoint boundedOffset = contentOffsetBoundedInValidRange(_scrollView.get(), contentOffset);
2912     return !pointsEqualInDevicePixels(contentOffset, boundedOffset, deviceScaleFactor);
2913 }
2914
2915 #if __IPHONE_OS_VERSION_MIN_REQUIRED >= 110000
2916 - (void)safeAreaInsetsDidChange
2917 {
2918     [super safeAreaInsetsDidChange];
2919
2920     [self _scheduleVisibleContentRectUpdate];
2921 }
2922 #endif
2923
2924 - (void)_scheduleVisibleContentRectUpdate
2925 {
2926     // For visible rect updates not associated with a specific UIScrollView, just consider our own scroller.
2927     [self _scheduleVisibleContentRectUpdateAfterScrollInView:_scrollView.get()];
2928 }
2929
2930 - (BOOL)_scrollViewIsInStableState:(UIScrollView *)scrollView
2931 {
2932     BOOL isStableState = !([scrollView isDragging] || [scrollView isDecelerating] || [scrollView isZooming] || [scrollView _isAnimatingZoom] || [scrollView _isScrollingToTop]);
2933
2934     if (isStableState && scrollView == _scrollView.get())
2935         isStableState = !_isChangingObscuredInsetsInteractively;
2936
2937     if (isStableState && scrollView == _scrollView.get())
2938         isStableState = ![self _scrollViewIsRubberBanding];
2939
2940     if (isStableState)
2941         isStableState = !scrollView._isInterruptingDeceleration;
2942
2943     if (NSNumber *stableOverride = self._stableStateOverride)
2944         isStableState = stableOverride.boolValue;
2945
2946     return isStableState;
2947 }
2948
2949 - (void)_addUpdateVisibleContentRectPreCommitHandler
2950 {
2951     auto retainedSelf = retainPtr(self);
2952     [CATransaction addCommitHandler:[retainedSelf] {
2953         WKWebView *webView = retainedSelf.get();
2954         if (![webView _isValid]) {
2955             RELEASE_LOG_IF(webView._page && webView._page->isAlwaysOnLoggingAllowed(), ViewState, "In CATransaction preCommitHandler, WKWebView %p is invalid", webView);
2956             return;
2957         }
2958
2959         @try {
2960             [webView _updateVisibleContentRects];
2961         } @catch (NSException *exception) {
2962             RELEASE_LOG_IF(webView._page && webView._page->isAlwaysOnLoggingAllowed(), ViewState, "In CATransaction preCommitHandler, -[WKWebView %p _updateVisibleContentRects] threw an exception", webView);
2963         }
2964         webView->_hasScheduledVisibleRectUpdate = NO;
2965     } forPhase:kCATransactionPhasePreCommit];
2966 }
2967
2968 - (void)_scheduleVisibleContentRectUpdateAfterScrollInView:(UIScrollView *)scrollView
2969 {
2970     _visibleContentRectUpdateScheduledFromScrollViewInStableState = [self _scrollViewIsInStableState:scrollView];
2971
2972     if (_hasScheduledVisibleRectUpdate) {
2973         auto timeNow = MonotonicTime::now();
2974         if ((timeNow - _timeOfRequestForVisibleContentRectUpdate) > delayBeforeNoVisibleContentsRectsLogging) {
2975             RELEASE_LOG_IF_ALLOWED("-[WKWebView %p _scheduleVisibleContentRectUpdateAfterScrollInView]: _hasScheduledVisibleRectUpdate is true but haven't updated visible content rects for %.2fs (last update was %.2fs ago) - valid %d",
2976                 self, (timeNow - _timeOfRequestForVisibleContentRectUpdate).value(), (timeNow - _timeOfLastVisibleContentRectUpdate).value(), [self _isValid]);
2977         }
2978         return;
2979     }
2980
2981     _hasScheduledVisibleRectUpdate = YES;
2982     _timeOfRequestForVisibleContentRectUpdate = MonotonicTime::now();
2983
2984     CATransactionPhase transactionPhase = [CATransaction currentPhase];
2985     if (transactionPhase == kCATransactionPhaseNull || transactionPhase == kCATransactionPhasePreLayout) {
2986         [self _addUpdateVisibleContentRectPreCommitHandler];
2987         return;
2988     }
2989
2990     dispatch_async(dispatch_get_main_queue(), [retainedSelf = retainPtr(self)] {
2991         WKWebView *webView = retainedSelf.get();
2992         if (![webView _isValid])
2993             return;
2994         [webView _addUpdateVisibleContentRectPreCommitHandler];
2995     });
2996 }
2997
2998 static bool scrollViewCanScroll(UIScrollView *scrollView)
2999 {
3000     if (!scrollView)
3001         return NO;
3002
3003     UIEdgeInsets contentInset = scrollView.contentInset;
3004     CGSize contentSize = scrollView.contentSize;
3005     CGSize boundsSize = scrollView.bounds.size;
3006
3007     return (contentSize.width + contentInset.left + contentInset.right) > boundsSize.width
3008         || (contentSize.height + contentInset.top + contentInset.bottom) > boundsSize.height;
3009 }
3010
3011 - (CGRect)_contentBoundsExtendedForRubberbandingWithScale:(CGFloat)scaleFactor
3012 {
3013     CGPoint contentOffset = [_scrollView contentOffset];
3014     CGPoint boundedOffset = contentOffsetBoundedInValidRange(_scrollView.get(), contentOffset);
3015
3016     CGFloat horiontalRubberbandAmountInContentCoordinates = (contentOffset.x - boundedOffset.x) / scaleFactor;
3017     CGFloat verticalRubberbandAmountInContentCoordinates = (contentOffset.y - boundedOffset.y) / scaleFactor;
3018
3019     CGRect extendedBounds = [_contentView bounds];
3020
3021     if (horiontalRubberbandAmountInContentCoordinates < 0) {
3022         extendedBounds.origin.x += horiontalRubberbandAmountInContentCoordinates;
3023         extendedBounds.size.width -= horiontalRubberbandAmountInContentCoordinates;
3024     } else if (horiontalRubberbandAmountInContentCoordinates > 0)
3025         extendedBounds.size.width += horiontalRubberbandAmountInContentCoordinates;
3026
3027     if (verticalRubberbandAmountInContentCoordinates < 0) {
3028         extendedBounds.origin.y += verticalRubberbandAmountInContentCoordinates;
3029         extendedBounds.size.height -= verticalRubberbandAmountInContentCoordinates;
3030     } else if (verticalRubberbandAmountInContentCoordinates > 0)
3031         extendedBounds.size.height += verticalRubberbandAmountInContentCoordinates;
3032
3033     return extendedBounds;
3034 }
3035
3036 - (void)_updateVisibleContentRects
3037 {
3038     BOOL inStableState = _visibleContentRectUpdateScheduledFromScrollViewInStableState;
3039
3040     if (![self usesStandardContentView]) {
3041         [_passwordView setFrame:self.bounds];
3042         [_customContentView web_computedContentInsetDidChange];
3043         RELEASE_LOG_IF_ALLOWED("%p -[WKWebView _updateVisibleContentRects:] - usesStandardContentView is NO, bailing", self);
3044         return;
3045     }
3046
3047     if (_delayUpdateVisibleContentRects) {
3048         _hadDelayedUpdateVisibleContentRects = YES;
3049         RELEASE_LOG_IF_ALLOWED("%p -[WKWebView _updateVisibleContentRects:] - _delayUpdateVisibleContentRects is YES, bailing", self);
3050         return;
3051     }
3052
3053     if (_dynamicViewportUpdateMode != WebKit::DynamicViewportUpdateMode::NotResizing
3054         || (_needsResetViewStateAfterCommitLoadForMainFrame && ![_contentView sizeChangedSinceLastVisibleContentRectUpdate])
3055         || [_scrollView isZoomBouncing]
3056         || _currentlyAdjustingScrollViewInsetsForKeyboard) {
3057         RELEASE_LOG_IF_ALLOWED("%p -[WKWebView _updateVisibleContentRects:] - scroll view state is non-stable, bailing (_dynamicViewportUpdateMode %d, _needsResetViewStateAfterCommitLoadForMainFrame %d, sizeChangedSinceLastVisibleContentRectUpdate %d, [_scrollView isZoomBouncing] %d, _currentlyAdjustingScrollViewInsetsForKeyboard %d)",
3058             self, _dynamicViewportUpdateMode, _needsResetViewStateAfterCommitLoadForMainFrame, [_contentView sizeChangedSinceLastVisibleContentRectUpdate], [_scrollView isZoomBouncing], _currentlyAdjustingScrollViewInsetsForKeyboard);
3059         return;
3060     }
3061
3062     CGRect visibleRectInContentCoordinates = [self _visibleContentRect];
3063
3064     UIEdgeInsets computedContentInsetUnadjustedForKeyboard = [self _computedObscuredInset];
3065     if (!_haveSetObscuredInsets)
3066         computedContentInsetUnadjustedForKeyboard.bottom -= _totalScrollViewBottomInsetAdjustmentForKeyboard;
3067
3068     CGFloat scaleFactor = contentZoomScale(self);
3069
3070     CGRect unobscuredRect = UIEdgeInsetsInsetRect(self.bounds, computedContentInsetUnadjustedForKeyboard);
3071     CGRect unobscuredRectInContentCoordinates = _frozenUnobscuredContentRect ? _frozenUnobscuredContentRect.value() : [self convertRect:unobscuredRect toView:_contentView.get()];
3072     unobscuredRectInContentCoordinates = CGRectIntersection(unobscuredRectInContentCoordinates, [self _contentBoundsExtendedForRubberbandingWithScale:scaleFactor]);
3073
3074     // The following logic computes the extent to which the bottom, top, left and right content insets are visible.
3075     auto scrollViewInsets = [_scrollView contentInset];
3076     auto scrollViewBounds = [_scrollView bounds];
3077     auto scrollViewContentSize = [_scrollView contentSize];
3078     auto scrollViewOriginIncludingInset = UIEdgeInsetsInsetRect(scrollViewBounds, computedContentInsetUnadjustedForKeyboard).origin;
3079     auto maximumVerticalScrollExtentWithoutRevealingBottomContentInset = scrollViewContentSize.height - CGRectGetHeight(scrollViewBounds);
3080     auto maximumHorizontalScrollExtentWithoutRevealingRightContentInset = scrollViewContentSize.width - CGRectGetWidth(scrollViewBounds);
3081     auto contentInsets = UIEdgeInsetsZero;
3082     if (scrollViewInsets.left > 0 && scrollViewOriginIncludingInset.x < 0)
3083         contentInsets.left = std::min(-scrollViewOriginIncludingInset.x, scrollViewInsets.left) / scaleFactor;
3084
3085     if (scrollViewInsets.top > 0 && scrollViewOriginIncludingInset.y < 0)
3086         contentInsets.top = std::min(-scrollViewOriginIncludingInset.y, scrollViewInsets.top) / scaleFactor;
3087
3088     if (scrollViewInsets.right > 0 && scrollViewOriginIncludingInset.x > maximumHorizontalScrollExtentWithoutRevealingRightContentInset)
3089         contentInsets.right = std::min(scrollViewOriginIncludingInset.x - maximumHorizontalScrollExtentWithoutRevealingRightContentInset, scrollViewInsets.right) / scaleFactor;
3090
3091     if (scrollViewInsets.bottom > 0 && scrollViewOriginIncludingInset.y > maximumVerticalScrollExtentWithoutRevealingBottomContentInset)
3092         contentInsets.bottom = std::min(scrollViewOriginIncludingInset.y - maximumVerticalScrollExtentWithoutRevealingBottomContentInset, scrollViewInsets.bottom) / scaleFactor;
3093
3094 #if ENABLE(CSS_SCROLL_SNAP) && ENABLE(ASYNC_SCROLLING)
3095     if (inStableState) {
3096         WebKit::RemoteScrollingCoordinatorProxy* coordinator = _page->scrollingCoordinatorProxy();
3097         if (coordinator && coordinator->hasActiveSnapPoint()) {
3098             CGPoint currentPoint = [_scrollView contentOffset];
3099             CGPoint activePoint = coordinator->nearestActiveContentInsetAdjustedSnapPoint(unobscuredRect.origin.y, currentPoint);
3100
3101             if (!CGPointEqualToPoint(activePoint, currentPoint)) {
3102                 RetainPtr<WKScrollView> strongScrollView = _scrollView;
3103                 dispatch_async(dispatch_get_main_queue(), [strongScrollView, activePoint] {
3104                     [strongScrollView setContentOffset:activePoint animated:NO];
3105                 });
3106             }
3107         }
3108     }
3109 #endif
3110
3111     [_contentView didUpdateVisibleRect:visibleRectInContentCoordinates
3112         unobscuredRect:unobscuredRectInContentCoordinates
3113         contentInsets:contentInsets
3114         unobscuredRectInScrollViewCoordinates:unobscuredRect
3115         obscuredInsets:_obscuredInsets
3116         unobscuredSafeAreaInsets:[self _computedUnobscuredSafeAreaInset]
3117         inputViewBounds:_inputViewBounds
3118         scale:scaleFactor minimumScale:[_scrollView minimumZoomScale]
3119         inStableState:inStableState
3120         isChangingObscuredInsetsInteractively:_isChangingObscuredInsetsInteractively
3121         enclosedInScrollableAncestorView:scrollViewCanScroll([self _scroller])];
3122
3123     while (!_visibleContentRectUpdateCallbacks.isEmpty()) {
3124         auto callback = _visibleContentRectUpdateCallbacks.takeLast();
3125         callback();
3126     }
3127     
3128     auto timeNow = MonotonicTime::now();
3129     if ((timeNow - _timeOfRequestForVisibleContentRectUpdate) > delayBeforeNoVisibleContentsRectsLogging)
3130         RELEASE_LOG_IF_ALLOWED("%p -[WKWebView _updateVisibleContentRects:] finally ran %.2fs after being scheduled", self, (timeNow - _timeOfRequestForVisibleContentRectUpdate).value());
3131
3132     _timeOfLastVisibleContentRectUpdate = timeNow;
3133 }
3134
3135 - (void)_didStartProvisionalLoadForMainFrame
3136 {
3137     if (_gestureController)
3138         _gestureController->didStartProvisionalLoadForMainFrame();
3139 }
3140
3141 static WebCore::FloatSize activeMaximumUnobscuredSize(WKWebView *webView, const CGRect& bounds)
3142 {
3143     return WebCore::FloatSize(webView->_overridesMaximumUnobscuredSize ? webView->_maximumUnobscuredSizeOverride : bounds.size);
3144 }
3145
3146 static int32_t activeOrientation(WKWebView *webView)
3147 {
3148     return webView->_overridesInterfaceOrientation ? deviceOrientationForUIInterfaceOrientation(webView->_interfaceOrientationOverride) : webView->_page->deviceOrientation();
3149 }
3150
3151 - (void)_cancelAnimatedResize
3152 {
3153     LOG_WITH_STREAM(VisibleRects, stream << "-[WKWebView " << _page->pageID() << " _cancelAnimatedResize:] " << " _dynamicViewportUpdateMode " << (int)_dynamicViewportUpdateMode);
3154     if (_dynamicViewportUpdateMode == WebKit::DynamicViewportUpdateMode::NotResizing)
3155         return;
3156
3157     if (!_customContentView) {
3158         if (_resizeAnimationView) {
3159             NSUInteger indexOfResizeAnimationView = [[_scrollView subviews] indexOfObject:_resizeAnimationView.get()];
3160             [_scrollView insertSubview:_contentView.get() atIndex:indexOfResizeAnimationView];
3161             [_scrollView insertSubview:[_contentView unscaledView] atIndex:indexOfResizeAnimationView + 1];
3162             [_resizeAnimationView removeFromSuperview];
3163             _resizeAnimationView = nil;
3164         }
3165
3166         [_contentView setHidden:NO];
3167         _resizeAnimationTransformAdjustments = CATransform3DIdentity;
3168     }
3169
3170     _dynamicViewportUpdateMode = WebKit::DynamicViewportUpdateMode::NotResizing;
3171     [self _scheduleVisibleContentRectUpdate];
3172 }
3173
3174 - (void)_didCompleteAnimatedResize
3175 {
3176     if (_dynamicViewportUpdateMode == WebKit::DynamicViewportUpdateMode::NotResizing)
3177         return;
3178
3179     [_contentView setHidden:NO];
3180
3181     if (!_resizeAnimationView) {
3182         // Paranoia. If _resizeAnimationView is null we'll end up setting a zero scale on the content view.
3183         RELEASE_LOG_IF_ALLOWED("%p -[WKWebView _didCompleteAnimatedResize:] - _resizeAnimationView is nil", self);
3184         [self _cancelAnimatedResize];
3185         return;
3186     }
3187
3188     NSUInteger indexOfResizeAnimationView = [[_scrollView subviews] indexOfObject:_resizeAnimationView.get()];
3189     [_scrollView insertSubview:_contentView.get() atIndex:indexOfResizeAnimationView];
3190     [_scrollView insertSubview:[_contentView unscaledView] atIndex:indexOfResizeAnimationView + 1];
3191
3192     CALayer *contentLayer = [_contentView layer];
3193     CGFloat adjustmentScale = _resizeAnimationTransformAdjustments.m11;
3194     contentLayer.sublayerTransform = CATransform3DIdentity;
3195
3196     CGFloat animatingScaleTarget = [[_resizeAnimationView layer] transform].m11;
3197     CATransform3D contentLayerTransform = contentLayer.transform;
3198     CGFloat currentScale = [[_resizeAnimationView layer] transform].m11 * contentLayerTransform.m11;
3199
3200     // We cannot use [UIScrollView setZoomScale:] directly because the UIScrollView delegate would get a callback with
3201     // an invalid contentOffset. The real content offset is only set below.
3202     // Since there is no public API for setting both the zoomScale and the contentOffset, we set the zoomScale manually
3203     // on the zoom layer and then only change the contentOffset.
3204     CGFloat adjustedScale = adjustmentScale * currentScale;
3205     contentLayerTransform.m11 = adjustedScale;
3206     contentLayerTransform.m22 = adjustedScale;
3207     contentLayer.transform = contentLayerTransform;
3208
3209     CGPoint currentScrollOffset = [_scrollView contentOffset];
3210     double horizontalScrollAdjustement = _resizeAnimationTransformAdjustments.m41 * animatingScaleTarget;
3211     double verticalScrollAdjustment = _resizeAnimationTransformAdjustments.m42 * animatingScaleTarget;
3212
3213     [_scrollView setContentSize:roundScrollViewContentSize(*_page, [_contentView frame].size)];
3214     [_scrollView setContentOffset:CGPointMake(currentScrollOffset.x - horizontalScrollAdjustement, currentScrollOffset.y - verticalScrollAdjustment)];
3215
3216     [_resizeAnimationView removeFromSuperview];
3217     _resizeAnimationView = nil;
3218     _resizeAnimationTransformAdjustments = CATransform3DIdentity;
3219
3220     _dynamicViewportUpdateMode = WebKit::DynamicViewportUpdateMode::NotResizing;
3221     [self _scheduleVisibleContentRectUpdate];
3222
3223     CGRect newBounds = self.bounds;
3224     auto newViewLayoutSize = [self activeViewLayoutSize:newBounds];
3225     auto newMaximumUnobscuredSize = activeMaximumUnobscuredSize(self, newBounds);
3226     int32_t newOrientation = activeOrientation(self);
3227
3228     if (!_lastSentViewLayoutSize || newViewLayoutSize != _lastSentViewLayoutSize.value())
3229         [self _dispatchSetViewLayoutSize:newViewLayoutSize];
3230
3231     if (!_lastSentMaximumUnobscuredSize || newMaximumUnobscuredSize != _lastSentMaximumUnobscuredSize.value())
3232         [self _dispatchSetMaximumUnobscuredSize:WebCore::FloatSize(newMaximumUnobscuredSize)];
3233
3234     if (!_lastSentDeviceOrientation || newOrientation != _lastSentDeviceOrientation.value())
3235         [self _dispatchSetDeviceOrientation:newOrientation];
3236
3237     while (!_callbacksDeferredDuringResize.isEmpty())
3238         _callbacksDeferredDuringResize.takeLast()();
3239 }
3240
3241 - (void)_didFinishLoadForMainFrame
3242 {
3243     if (_gestureController)
3244         _gestureController->didFinishLoadForMainFrame();
3245 }
3246
3247 - (void)_didFailLoadForMainFrame
3248 {
3249     if (_gestureController)
3250         _gestureController->didFailLoadForMainFrame();
3251 }
3252
3253 - (void)_didSameDocumentNavigationForMainFrame:(WebKit::SameDocumentNavigationType)navigationType
3254 {
3255     [_customContentView web_didSameDocumentNavigation:toAPI(navigationType)];
3256
3257     if (_gestureController)
3258         _gestureController->didSameDocumentNavigationForMainFrame(navigationType);
3259 }
3260
3261 - (void)_keyboardChangedWithInfo:(NSDictionary *)keyboardInfo adjustScrollView:(BOOL)adjustScrollView
3262 {
3263     NSValue *endFrameValue = [keyboardInfo objectForKey:UIKeyboardFrameEndUserInfoKey];
3264     if (!endFrameValue)
3265         return;
3266
3267     // The keyboard rect is always in screen coordinates. In the view services case the window does not
3268     // have the interface orientation rotation transformation; its host does. So, it makes no sense to
3269     // clip the keyboard rect against its screen.
3270     if ([[self window] _isHostedInAnotherProcess])
3271         _inputViewBounds = [self.window convertRect:[endFrameValue CGRectValue] fromWindow:nil];
3272     else
3273         _inputViewBounds = [self.window convertRect:CGRectIntersection([endFrameValue CGRectValue], self.window.screen.bounds) fromWindow:nil];
3274
3275     if ([[UIPeripheralHost sharedInstance] isUndocked])
3276         _inputViewBounds = CGRectZero;
3277
3278     if (adjustScrollView) {
3279         CGFloat bottomInsetBeforeAdjustment = [_scrollView contentInset].bottom;
3280         SetForScope<BOOL> insetAdjustmentGuard(_currentlyAdjustingScrollViewInsetsForKeyboard, YES);
3281         [_scrollView _adjustForAutomaticKeyboardInfo:keyboardInfo animated:YES lastAdjustment:&_lastAdjustmentForScroller];
3282         CGFloat bottomInsetAfterAdjustment = [_scrollView contentInset].bottom;
3283         if (bottomInsetBeforeAdjustment != bottomInsetAfterAdjustment)
3284             _totalScrollViewBottomInsetAdjustmentForKeyboard += bottomInsetAfterAdjustment - bottomInsetBeforeAdjustment;
3285     }
3286
3287     [self _scheduleVisibleContentRectUpdate];
3288 }
3289
3290 - (BOOL)_shouldUpdateKeyboardWithInfo:(NSDictionary *)keyboardInfo
3291 {
3292     if ([_contentView isFocusingElement])
3293         return YES;
3294
3295     NSNumber *isLocalKeyboard = [keyboardInfo valueForKey:UIKeyboardIsLocalUserInfoKey];
3296     return isLocalKeyboard && !isLocalKeyboard.boolValue;
3297 }
3298
3299 - (void)_keyboardWillChangeFrame:(NSNotification *)notification
3300 {
3301     if ([self _shouldUpdateKeyboardWithInfo:notification.userInfo])
3302         [self _keyboardChangedWithInfo:notification.userInfo adjustScrollView:YES];
3303 }
3304
3305 - (void)_keyboardDidChangeFrame:(NSNotification *)notification
3306 {
3307     [self _keyboardChangedWithInfo:notification.userInfo adjustScrollView:NO];
3308 }
3309
3310 - (void)_keyboardWillShow:(NSNotification *)notification
3311 {
3312     if ([self _shouldUpdateKeyboardWithInfo:notification.userInfo])
3313         [self _keyboardChangedWithInfo:notification.userInfo adjustScrollView:YES];
3314
3315     _page->setIsKeyboardAnimatingIn(true);
3316 }
3317
3318 - (void)_keyboardDidShow:(NSNotification *)notification
3319 {
3320     _page->setIsKeyboardAnimatingIn(false);
3321 }
3322
3323 - (void)_keyboardWillHide:(NSNotification *)notification
3324 {
3325     // Ignore keyboard will hide notifications sent during rotation. They're just there for
3326     // backwards compatibility reasons and processing the will hide notification would
3327     // temporarily screw up the unobscured view area.
3328     if ([[UIPeripheralHost sharedInstance] rotationState])
3329         return;
3330
3331     [self _keyboardChangedWithInfo:notification.userInfo adjustScrollView:YES];
3332 }
3333
3334 static void hardwareKeyboardAvailabilityChangedCallback(CFNotificationCenterRef, void* observer, CFStringRef, const void*, CFDictionaryRef)
3335 {
3336     ASSERT(observer);
3337     WKWebView *webView = (__bridge WKWebView *)observer;
3338     [webView->_contentView _hardwareKeyboardAvailabilityChanged];
3339     webView._page->hardwareKeyboardAvailabilityChanged(GSEventIsHardwareKeyboardAttached());
3340 }
3341
3342 - (void)_windowDidRotate:(NSNotification *)notification
3343 {
3344     if (!_overridesInterfaceOrientation)
3345         [self _dispatchSetDeviceOrientation:deviceOrientation()];
3346 }
3347
3348 - (void)_contentSizeCategoryDidChange:(NSNotification *)notification
3349 {
3350     _page->contentSizeCategoryDidChange([self _contentSizeCategory]);
3351 }
3352
3353 - (NSString *)_contentSizeCategory
3354 {
3355     return [[UIApplication sharedApplication] preferredContentSizeCategory];
3356 }
3357
3358 - (void)_accessibilitySettingsDidChange:(NSNotification *)notification
3359 {
3360     _page->accessibilitySettingsDidChange();
3361 }
3362
3363 - (void)setAllowsBackForwardNavigationGestures:(BOOL)allowsBackForwardNavigationGestures
3364 {
3365     if (_allowsBackForwardNavigationGestures == allowsBackForwardNavigationGestures)
3366         return;
3367
3368     _allowsBackForwardNavigationGestures = allowsBackForwardNavigationGestures;
3369
3370     if (allowsBackForwardNavigationGestures && !_gestureController) {
3371         _gestureController = std::make_unique<WebKit::ViewGestureController>(*_page);
3372         _gestureController->installSwipeHandler(self, [self scrollView]);
3373         if (WKWebView *alternateWebView = [_configuration _alternateWebViewForNavigationGestures])
3374             _gestureController->setAlternateBackForwardListSourcePage(alternateWebView->_page.get());
3375     }
3376
3377     if (_gestureController)
3378         _gestureController->setSwipeGestureEnabled(allowsBackForwardNavigationGestures);
3379
3380     _page->setShouldRecordNavigationSnapshots(allowsBackForwardNavigationGestures);
3381 }
3382
3383 - (BOOL)allowsBackForwardNavigationGestures
3384 {
3385     return _allowsBackForwardNavigationGestures;
3386 }
3387
3388 - (BOOL)_isNavigationSwipeGestureRecognizer:(UIGestureRecognizer *)recognizer
3389 {
3390     if (!_gestureController)
3391         return NO;
3392     return _gestureController->isNavigationSwipeGestureRecognizer(recognizer);
3393 }
3394
3395 - (void)_navigationGestureDidBegin
3396 {
3397     // During a back/forward swipe, there's a view interposed between this view and the content view that has
3398     // an offset and animation on it, which results in computing incorrect rectangles. Work around by using
3399     // frozen rects during swipes.
3400     CGRect fullViewRect = self.bounds;
3401     CGRect unobscuredRect = UIEdgeInsetsInsetRect(fullViewRect, [self _computedObscuredInset]);
3402
3403     _frozenVisibleContentRect = [self convertRect:fullViewRect toView:_contentView.get()];
3404     _frozenUnobscuredContentRect = [self convertRect:unobscuredRect toView:_contentView.get()];
3405
3406     LOG_WITH_STREAM(VisibleRects, stream << "_navigationGestureDidBegin: freezing visibleContentRect " << WebCore::FloatRect(_frozenVisibleContentRect.value()) << " UnobscuredContentRect " << WebCore::FloatRect(_frozenUnobscuredContentRect.value()));
3407 }
3408
3409 - (void)_navigationGestureDidEnd
3410 {
3411     _frozenVisibleContentRect = WTF::nullopt;
3412     _frozenUnobscuredContentRect = WTF::nullopt;
3413 }
3414
3415 - (void)_showPasswordViewWithDocumentName:(NSString *)documentName passwordHandler:(void (^)(NSString *))passwordHandler
3416 {
3417     ASSERT(!_passwordView);
3418     _passwordView = adoptNS([[WKPasswordView alloc] initWithFrame:self.bounds documentName:documentName]);
3419     [_passwordView setUserDidEnterPassword:passwordHandler];
3420     [_passwordView showInScrollView:_scrollView.get()];
3421     self._currentContentView.hidden = YES;
3422 }
3423
3424 - (void)_hidePasswordView
3425 {
3426     if (!_passwordView)
3427         return;
3428
3429     self._currentContentView.hidden = NO;
3430     [_passwordView hide];
3431     _passwordView = nil;
3432 }
3433
3434 - (WKPasswordView *)_passwordView
3435 {
3436     return _passwordView.get();
3437 }
3438
3439 - (void)_updateScrollViewInsetAdjustmentBehavior
3440 {
3441 #if __IPHONE_OS_VERSION_MIN_REQUIRED >= 110000
3442     if (![_scrollView _contentInsetAdjustmentBehaviorWasExternallyOverridden])
3443         [_scrollView _setContentInsetAdjustmentBehaviorInternal:self._safeAreaShouldAffectObscuredInsets ? UIScrollViewContentInsetAdjustmentAlways : UIScrollViewContentInsetAdjustmentNever];
3444 #endif
3445 }
3446
3447 - (void)_setAvoidsUnsafeArea:(BOOL)avoidsUnsafeArea
3448 {
3449     if (_avoidsUnsafeArea == avoidsUnsafeArea)
3450         return;
3451
3452     _avoidsUnsafeArea = avoidsUnsafeArea;
3453
3454     [self _updateScrollViewInsetAdjustmentBehavior];
3455     [self _scheduleVisibleContentRectUpdate];
3456
3457     id <WKUIDelegatePrivate> uiDelegate = (id <WKUIDelegatePrivate>)[self UIDelegate];
3458     if ([uiDelegate respondsToSelector:@selector(_webView:didChangeSafeAreaShouldAffectObscuredInsets:)])
3459         [uiDelegate _webView:self didChangeSafeAreaShouldAffectObscuredInsets:avoidsUnsafeArea];
3460 }
3461
3462 - (BOOL)_haveSetObscuredInsets
3463 {
3464     return _haveSetObscuredInsets;
3465 }
3466
3467 #endif // PLATFORM(IOS_FAMILY)
3468
3469 #if ENABLE(ACCESSIBILITY_EVENTS)
3470
3471 static void accessibilityEventsEnabledChangedCallback(CFNotificationCenterRef, void* observer, CFStringRef, const void*, CFDictionaryRef)
3472 {
3473     ASSERT(observer);
3474     WKWebView *webview = (__bridge WKWebView *)observer;
3475     [webview _updateAccessibilityEventsEnabled];
3476 }
3477
3478 - (void)_updateAccessibilityEventsEnabled
3479 {
3480     if (!isNullFunctionPointer(_AXSWebAccessibilityEventsEnabled))
3481         _page->updateAccessibilityEventsEnabled(_AXSWebAccessibilityEventsEnabled());
3482 }
3483
3484 #endif
3485
3486 #pragma mark OS X-specific methods
3487
3488 #if PLATFORM(MAC)
3489
3490 - (BOOL)acceptsFirstResponder
3491 {
3492     return _impl->acceptsFirstResponder();
3493 }
3494
3495 - (BOOL)becomeFirstResponder
3496 {
3497     return _impl->becomeFirstResponder();
3498 }
3499
3500 - (BOOL)resignFirstResponder
3501 {
3502     return _impl->resignFirstResponder();
3503 }
3504
3505 - (void)viewWillStartLiveResize
3506 {
3507     _impl->viewWillStartLiveResize();
3508 }
3509
3510 - (void)viewDidEndLiveResize
3511 {
3512     _impl->viewDidEndLiveResize();
3513 }
3514
3515 - (BOOL)isFlipped
3516 {
3517     return YES;
3518 }
3519
3520 - (NSSize)intrinsicContentSize
3521 {
3522     return NSSizeFromCGSize(_impl->intrinsicContentSize());
3523 }
3524
3525 - (void)prepareContentInRect:(NSRect)rect
3526 {
3527     _impl->prepareContentInRect(NSRectToCGRect(rect));
3528 }
3529
3530 - (void)setFrameSize:(NSSize)size
3531 {
3532     [super setFrameSize:size];
3533     [_safeBrowsingWarning setFrame:self.bounds];
3534     _impl->setFrameSize(NSSizeToCGSize(size));
3535 }
3536
3537 IGNORE_WARNINGS_BEGIN("deprecated-implementations")
3538 - (void)renewGState
3539 IGNORE_WARNINGS_END
3540 {
3541     _impl->renewGState();
3542     [super renewGState];
3543 }
3544
3545 #define WEBCORE_COMMAND(command) - (void)command:(id)sender { _impl->executeEditCommandForSelector(_cmd); }
3546
3547 WEBCORE_COMMAND(alignCenter)
3548 WEBCORE_COMMAND(alignJustified)
3549 WEBCORE_COMMAND(alignLeft)
3550 WEBCORE_COMMAND(alignRight)
3551 WEBCORE_COMMAND(copy)
3552 WEBCORE_COMMAND(cut)
3553 WEBCORE_COMMAND(delete)
3554 WEBCORE_COMMAND(deleteBackward)
3555 WEBCORE_COMMAND(deleteBackwardByDecomposingPreviousCharacter)
3556 WEBCORE_COMMAND(deleteForward)
3557 WEBCORE_COMMAND(deleteToBeginningOfLine)
3558 WEBCORE_COMMAND(deleteToBeginningOfParagraph)
3559 WEBCORE_COMMAND(deleteToEndOfLine)
3560 WEBCORE_COMMAND(deleteToEndOfParagraph)
3561 WEBCORE_COMMAND(deleteToMark)
3562 WEBCORE_COMMAND(deleteWordBackward)
3563 WEBCORE_COMMAND(deleteWordForward)
3564 WEBCORE_COMMAND(ignoreSpelling)
3565 WEBCORE_COMMAND(indent)
3566 WEBCORE_COMMAND(insertBacktab)
3567 WEBCORE_COMMAND(insertLineBreak)
3568 WEBCORE_COMMAND(insertNewline)
3569 WEBCORE_COMMAND(insertNewlineIgnoringFieldEditor)
3570 WEBCORE_COMMAND(insertParagraphSeparator)
3571 WEBCORE_COMMAND(insertTab)
3572 WEBCORE_COMMAND(insertTabIgnoringFieldEditor)
3573 WEBCORE_COMMAND(makeTextWritingDirectionLeftToRight)
3574 WEBCORE_COMMAND(makeTextWritingDirectionNatural)
3575 WEBCORE_COMMAND(makeTextWritingDirectionRightToLeft)
3576 WEBCORE_COMMAND(moveBackward)
3577 WEBCORE_COMMAND(moveBackwardAndModifySelection)
3578 WEBCORE_COMMAND(moveDown)
3579 WEBCORE_COMMAND(moveDownAndModifySelection)
3580 WEBCORE_COMMAND(moveForward)
3581 WEBCORE_COMMAND(moveForwardAndModifySelection)
3582 WEBCORE_COMMAND(moveLeft)
3583 WEBCORE_COMMAND(moveLeftAndModifySelection)
3584 WEBCORE_COMMAND(moveParagraphBackwardAndModifySelection)
3585 WEBCORE_COMMAND(moveParagraphForwardAndModifySelection)
3586 WEBCORE_COMMAND(moveRight)
3587 WEBCORE_COMMAND(moveRightAndModifySelection)
3588 WEBCORE_COMMAND(moveToBeginningOfDocument)
3589 WEBCORE_COMMAND(moveToBeginningOfDocumentAndModifySelection)
3590 WEBCORE_COMMAND(moveToBeginningOfLine)
3591 WEBCORE_COMMAND(moveToBeginningOfLineAndModifySelection)
3592 WEBCORE_COMMAND(moveToBeginningOfParagraph)
3593 WEBCORE_COMMAND(moveToBeginningOfParagraphAndModifySelection)
3594 WEBCORE_COMMAND(moveToBeginningOfSentence)
3595 WEBCORE_COMMAND(moveToBeginningOfSentenceAndModifySelection)
3596 WEBCORE_COMMAND(moveToEndOfDocument)
3597 WEBCORE_COMMAND(moveToEndOfDocumentAndModifySelection)
3598 WEBCORE_COMMAND(moveToEndOfLine)
3599 WEBCORE_COMMAND(moveToEndOfLineAndModifySelection)
3600 WEBCORE_COMMAND(moveToEndOfParagraph)
3601 WEBCORE_COMMAND(moveToEndOfParagraphAndModifySelection)
3602 WEBCORE_COMMAND(moveToEndOfSentence)
3603 WEBCORE_COMMAND(moveToEndOfSentenceAndModifySelection)
3604 WEBCORE_COMMAND(moveToLeftEndOfLine)
3605 WEBCORE_COMMAND(moveToLeftEndOfLineAndModifySelection)
3606 WEBCORE_COMMAND(moveToRightEndOfLine)
3607 WEBCORE_COMMAND(moveToRightEndOfLineAndModifySelection)
3608 WEBCORE_COMMAND(moveUp)
3609 WEBCORE_COMMAND(moveUpAndModifySelection)
3610 WEBCORE_COMMAND(moveWordBackward)
3611 WEBCORE_COMMAND(moveWordBackwardAndModifySelection)
3612 WEBCORE_COMMAND(moveWordForward)
3613 WEBCORE_COMMAND(moveWordForwardAndModifySelection)
3614 WEBCORE_COMMAND(moveWordLeft)
3615 WEBCORE_COMMAND(moveWordLeftAndModifySelection)
3616 WEBCORE_COMMAND(moveWordRight)
3617 WEBCORE_COMMAND(moveWordRightAndModifySelection)
3618 WEBCORE_COMMAND(outdent)
3619 WEBCORE_COMMAND(pageDown)
3620 WEBCORE_COMMAND(pageDownAndModifySelection)
3621 WEBCORE_COMMAND(pageUp)
3622 WEBCORE_COMMAND(pageUpAndModifySelection)
3623 WEBCORE_COMMAND(paste)
3624 WEBCORE_COMMAND(pasteAsPlainText)
3625 WEBCORE_COMMAND(scrollPageDown)
3626 WEBCORE_COMMAND(scrollPageUp)
3627 WEBCORE_COMMAND(scrollLineDown)
3628 WEBCORE_COMMAND(scrollLineUp)
3629 WEBCORE_COMMAND(scrollToBeginningOfDocument)
3630 WEBCORE_COMMAND(scrollToEndOfDocument)
3631 WEBCORE_COMMAND(selectAll)
3632 WEBCORE_COMMAND(selectLine)
3633 WEBCORE_COMMAND(selectParagraph)
3634 WEBCORE_COMMAND(selectSentence)
3635 WEBCORE_COMMAND(selectToMark)
3636 WEBCORE_COMMAND(selectWord)
3637 WEBCORE_COMMAND(setMark)
3638 WEBCORE_COMMAND(subscript)
3639 WEBCORE_COMMAND(superscript)
3640 WEBCORE_COMMAND(swapWithMark)
3641 WEBCORE_COMMAND(takeFindStringFromSelection)
3642 WEBCORE_COMMAND(transpose)
3643 WEBCORE_COMMAND(underline)
3644 WEBCORE_COMMAND(unscript)
3645 WEBCORE_COMMAND(yank)
3646 WEBCORE_COMMAND(yankAndSelect)
3647
3648 #undef WEBCORE_COMMAND
3649
3650 - (BOOL)writeSelectionToPasteboard:(NSPasteboard *)pasteboard types:(NSArray *)types
3651 {
3652     return _impl->writeSelectionToPasteboard(pasteboard, types);
3653 }
3654
3655 - (void)centerSelectionInVisibleArea:(id)sender
3656 {
3657     _impl->centerSelectionInVisibleArea();
3658 }
3659
3660 - (id)validRequestorForSendType:(NSString *)sendType returnType:(NSString *)returnType
3661 {
3662     return _impl->validRequestorForSendAndReturnTypes(sendType, returnType);
3663 }
3664
3665 - (BOOL)readSelectionFromPasteboard:(NSPasteboard *)pasteboard
3666 {
3667     return _impl->readSelectionFromPasteboard(pasteboard);
3668 }
3669
3670 - (void)changeFont:(id)sender
3671 {
3672     _impl->changeFontFromFontManager();
3673 }
3674
3675 - (void)changeColor:(id)sender
3676 {
3677     _impl->changeFontColorFromSender(sender);
3678 }
3679
3680 - (void)changeAttributes:(id)sender
3681 {
3682     _impl->changeFontAttributesFromSender(sender);
3683 }
3684
3685 - (IBAction)startSpeaking:(id)sender
3686 {
3687     _impl->startSpeaking();
3688 }
3689
3690 - (IBAction)stopSpeaking:(id)sender
3691 {
3692     _impl->stopSpeaking(sender);
3693 }
3694
3695 - (IBAction)showGuessPanel:(id)sender
3696 {
3697     _impl->showGuessPanel(sender);
3698 }
3699
3700 - (IBAction)checkSpelling:(id)sender
3701 {
3702     _impl->checkSpelling();
3703 }
3704
3705 - (void)changeSpelling:(id)sender
3706 {
3707     _impl->changeSpelling(sender);
3708 }
3709
3710 - (IBAction)toggleContinuousSpellChecking:(id)sender
3711 {
3712     _impl->toggleContinuousSpellChecking();
3713 }
3714
3715 - (BOOL)isGrammarCheckingEnabled
3716 {
3717     return _impl->isGrammarCheckingEnabled();
3718 }
3719
3720 - (void)setGrammarCheckingEnabled:(BOOL)flag
3721 {
3722     _impl->setGrammarCheckingEnabled(flag);
3723 }
3724
3725 - (IBAction)toggleGrammarChecking:(id)sender
3726 {
3727     _impl->toggleGrammarChecking();
3728 }
3729
3730 - (IBAction)toggleAutomaticSpellingCorrection:(id)sender
3731 {
3732     _impl->toggleAutomaticSpellingCorrection();
3733 }
3734
3735 - (void)orderFrontSubstitutionsPanel:(id)sender
3736 {
3737     _impl->orderFrontSubstitutionsPanel(sender);
3738 }
3739
3740 - (IBAction)toggleSmartInsertDelete:(id)sender
3741 {
3742     _impl->toggleSmartInsertDelete();
3743 }
3744
3745 - (BOOL)isAutomaticQuoteSubstitutionEnabled
3746 {
3747     return _impl->isAutomaticQuoteSubstitutionEnabled();
3748 }
3749
3750 - (void)setAutomaticQuoteSubstitutionEnabled:(BOOL)flag
3751 {
3752     _impl->setAutomaticQuoteSubstitutionEnabled(flag);
3753 }
3754
3755 - (void)toggleAutomaticQuoteSubstitution:(id)sender
3756 {
3757     _impl->toggleAutomaticQuoteSubstitution();
3758 }
3759
3760 - (BOOL)isAutomaticDashSubstitutionEnabled
3761 {
3762     return _impl->isAutomaticDashSubstitutionEnabled();
3763 }
3764
3765 - (void)setAutomaticDashSubstitutionEnabled:(BOOL)flag
3766 {
3767     _impl->setAutomaticDashSubstitutionEnabled(flag);
3768 }
3769
3770 - (void)toggleAutomaticDashSubstitution:(id)sender
3771 {
3772     _impl->toggleAutomaticDashSubstitution();
3773 }
3774
3775 - (BOOL)isAutomaticLinkDetectionEnabled
3776 {
3777     return _impl->isAutomaticLinkDetectionEnabled();
3778 }
3779
3780 - (void)setAutomaticLinkDetectionEnabled:(BOOL)flag
3781 {
3782     _impl->setAutomaticLinkDetectionEnabled(flag);
3783 }
3784
3785 - (void)toggleAutomaticLinkDetection:(id)sender
3786 {
3787     _impl->toggleAutomaticLinkDetection();
3788 }
3789
3790 - (BOOL)isAutomaticTextReplacementEnabled
3791 {
3792     return _impl->isAutomaticTextReplacementEnabled();
3793 }
3794
3795 - (void)setAutomaticTextReplacementEnabled:(BOOL)flag
3796 {
3797     _impl->setAutomaticTextReplacementEnabled(flag);
3798 }
3799
3800 - (void)toggleAutomaticTextReplacement:(id)sender
3801 {
3802     _impl->toggleAutomaticTextReplacement();
3803 }
3804
3805 - (void)uppercaseWord:(id)sender
3806 {
3807     _impl->uppercaseWord();
3808 }
3809
3810 - (void)lowercaseWord:(id)sender
3811 {
3812     _impl->lowercaseWord();
3813 }
3814
3815 - (void)capitalizeWord:(id)sender
3816 {
3817     _impl->capitalizeWord();
3818 }
3819
3820 - (BOOL)_wantsKeyDownForEvent:(NSEvent *)event
3821 {
3822     return _impl->wantsKeyDownForEvent(event);
3823 }
3824
3825 - (void)scrollWheel:(NSEvent *)event
3826 {
3827     _impl->scrollWheel(event);
3828 }
3829
3830 - (void)swipeWithEvent:(NSEvent *)event
3831 {
3832     _impl->swipeWithEvent(event);
3833 }
3834
3835 - (void)mouseMoved:(NSEvent *)event
3836 {
3837     _impl->mouseMoved(event);
3838 }
3839
3840 - (void)mouseDown:(NSEvent *)event
3841 {
3842     _impl->mouseDown(event);
3843 }
3844
3845 - (void)mouseUp:(NSEvent *)event
3846 {
3847     _impl->mouseUp(event);
3848 }
3849
3850 - (void)mouseDragged:(NSEvent *)event
3851 {
3852     _impl->mouseDragged(event);
3853 }
3854
3855 - (void)mouseEntered:(NSEvent *)event
3856 {
3857     _impl->mouseEntered(event);
3858 }
3859
3860 - (void)mouseExited:(NSEvent *)event
3861 {
3862     _impl->mouseExited(event);
3863 }
3864
3865 - (void)otherMouseDown:(NSEvent *)event
3866 {
3867     _impl->otherMouseDown(event);
3868 }
3869
3870 - (void)otherMouseDragged:(NSEvent *)event
3871 {
3872     _impl->otherMouseDragged(event);
3873 }
3874
3875 - (void)otherMouseUp:(NSEvent *)event
3876 {
3877     _impl->otherMouseUp(event);
3878 }
3879
3880 - (void)rightMouseDown:(NSEvent *)event
3881 {
3882     _impl->rightMouseDown(event);
3883 }
3884
3885 - (void)rightMouseDragged:(NSEvent *)event
3886 {
3887     _impl->rightMouseDragged(event);
3888 }
3889
3890 - (void)rightMouseUp:(NSEvent *)event
3891 {
3892     _impl->rightMouseUp(event);
3893 }
3894
3895 - (void)pressureChangeWithEvent:(NSEvent *)event
3896 {
3897     _impl->pressureChangeWithEvent(event);
3898 }
3899
3900 - (BOOL)acceptsFirstMouse:(NSEvent *)event
3901 {
3902     return _impl->acceptsFirstMouse(event);
3903 }
3904
3905 - (BOOL)shouldDelayWindowOrderingForEvent:(NSEvent *)event
3906 {
3907     return _impl->shouldDelayWindowOrderingForEvent(event);
3908 }
3909
3910 - (void)doCommandBySelector:(SEL)selector
3911 {
3912     _impl->doCommandBySelector(selector);
3913 }
3914
3915 - (void)insertText:(id)string
3916 {
3917     _impl->insertText(string);
3918 }
3919
3920 - (void)insertText:(id)string replacementRange:(NSRange)replacementRange
3921 {
3922     _impl->insertText(string, replacementRange);
3923 }
3924
3925 - (NSTextInputContext *)inputContext
3926 {
3927     if (!_impl)
3928         return nil;
3929     return _impl->inputContext();
3930 }
3931
3932 - (BOOL)performKeyEquivalent:(NSEvent *)event
3933 {
3934     return _impl->performKeyEquivalent(event);
3935 }
3936
3937 - (void)keyUp:(NSEvent *)theEvent
3938 {
3939     _impl->keyUp(theEvent);
3940 }
3941
3942 - (void)keyDown:(NSEvent *)theEvent
3943 {
3944     _impl->keyDown(theEvent);
3945 }
3946
3947 - (void)flagsChanged:(NSEvent *)theEvent
3948 {
3949     _impl->flagsChanged(theEvent);
3950 }
3951
3952 - (void)setMarkedText:(id)string selectedRange:(NSRange)newSelectedRange replacementRange:(NSRange)replacementRange
3953 {
3954     _impl->setMarkedText(string, newSelectedRange, replacementRange);
3955 }
3956
3957 - (void)unmarkText
3958 {
3959     _impl->unmarkText();
3960 }
3961
3962 - (NSRange)selectedRange
3963 {
3964     return _impl->selectedRange();
3965 }
3966
3967 - (BOOL)hasMarkedText
3968 {
3969     return _impl->hasMarkedText();
3970 }
3971
3972 - (NSRange)markedRange
3973 {
3974     return _impl->markedRange();
3975 }
3976
3977 - (NSAttributedString *)attributedSubstringForProposedRange:(NSRange)nsRange actualRange:(NSRangePointer)actualRange
3978 {
3979     return _impl->attributedSubstringForProposedRange(nsRange, actualRange);
3980 }
3981
3982 - (NSUInteger)characterIndexForPoint:(NSPoint)thePoint
3983 {
3984     return _impl->characterIndexForPoint(thePoint);
3985 }
3986
3987 - (void)typingAttributesWithCompletionHandler:(void(^)(NSDictionary<NSString *, id> *))completion
3988 {
3989     _impl->typingAttributesWithCompletionHandler(completion);
3990 }
3991
3992 - (NSRect)firstRectForCharacterRange:(NSRange)theRange actualRange:(NSRangePointer)actualRange
3993 {
3994     return _impl->firstRectForCharacterRange(theRange, actualRange);
3995 }
3996
3997 - (void)selectedRangeWithCompletionHandler:(void(^)(NSRange selectedRange))completionHandlerPtr
3998 {
3999     _impl->selectedRangeWithCompletionHandler(completionHandlerPtr);
4000 }
4001
4002 - (void)markedRangeWithCompletionHandler:(void(^)(NSRange markedRange))completionHandlerPtr
4003 {
4004     _impl->markedRangeWithCompletionHandler(completionHandlerPtr);
4005 }
4006
4007 - (void)hasMarkedTextWithCompletionHandler:(void(^)(BOOL hasMarkedText))completionHandlerPtr
4008 {
4009     _impl->hasMarkedTextWithCompletionHandler(completionHandlerPtr);
4010 }
4011
4012 - (void)attributedSubstringForProposedRange:(NSRange)nsRange completionHandler:(void(^)(NSAttributedString *attrString, NSRange actualRange))completionHandlerPtr
4013 {
4014     _impl->attributedSubstringForProposedRange(nsRange, completionHandlerPtr);
4015 }
4016
4017 - (void)firstRectForCharacterRange:(NSRange)theRange completionHandler:(void(^)(NSRect firstRect, NSRange actualRange))completionHandlerPtr
4018 {
4019     _impl->firstRectForCharacterRange(theRange, completionHandlerPtr);
4020 }
4021
4022 - (void)characterIndexForPoint:(NSPoint)thePoint completionHandler:(void(^)(NSUInteger))completionHandlerPtr
4023 {
4024     _impl->characterIndexForPoint(thePoint, completionHandlerPtr);
4025 }
4026
4027 - (NSArray *)validAttributesForMarkedText
4028 {
4029     return _impl->validAttributesForMarkedText();
4030 }
4031
4032 #if ENABLE(DRAG_SUPPORT)
4033 IGNORE_WARNINGS_BEGIN("deprecated-implementations")
4034 - (void)draggedImage:(NSImage *)image endedAt:(NSPoint)endPoint operation:(NSDragOperation)operation
4035 IGNORE_WARNINGS_END
4036 {
4037     _impl->draggedImage(image, NSPointToCGPoint(endPoint), operation);
4038 }
4039
4040 - (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)draggingInfo
4041 {
4042     return _impl->d