WKScrollView background color does not match WKWebView before content is loaded.
[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])
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 USE(SYSTEM_PREVIEW)
632     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::systemPreviewEnabledKey(), WebKit::WebPreferencesStore::Value(!![_configuration _systemPreviewEnabled]));
633 #endif
634 #endif
635
636     WKAudiovisualMediaTypes mediaTypesRequiringUserGesture = [_configuration mediaTypesRequiringUserActionForPlayback];
637     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::requiresUserGestureForVideoPlaybackKey(), WebKit::WebPreferencesStore::Value((mediaTypesRequiringUserGesture & WKAudiovisualMediaTypeVideo) == WKAudiovisualMediaTypeVideo));
638     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::requiresUserGestureForAudioPlaybackKey(), WebKit::WebPreferencesStore::Value(((mediaTypesRequiringUserGesture & WKAudiovisualMediaTypeAudio) == WKAudiovisualMediaTypeAudio)));
639     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::requiresUserGestureToLoadVideoKey(), WebKit::WebPreferencesStore::Value(shouldRequireUserGestureToLoadVideo()));
640     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::mainContentUserGestureOverrideEnabledKey(), WebKit::WebPreferencesStore::Value(!![_configuration _mainContentUserGestureOverrideEnabled]));
641     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::invisibleAutoplayNotPermittedKey(), WebKit::WebPreferencesStore::Value(!![_configuration _invisibleAutoplayNotPermitted]));
642     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::mediaDataLoadsAutomaticallyKey(), WebKit::WebPreferencesStore::Value(!![_configuration _mediaDataLoadsAutomatically]));
643     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::attachmentElementEnabledKey(), WebKit::WebPreferencesStore::Value(!![_configuration _attachmentElementEnabled]));
644
645 #if ENABLE(DATA_DETECTION) && PLATFORM(IOS_FAMILY)
646     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::dataDetectorTypesKey(), WebKit::WebPreferencesStore::Value(static_cast<uint32_t>(fromWKDataDetectorTypes([_configuration dataDetectorTypes]))));
647 #endif
648 #if ENABLE(WIRELESS_PLAYBACK_TARGET)
649     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::allowsAirPlayForMediaPlaybackKey(), WebKit::WebPreferencesStore::Value(!![_configuration allowsAirPlayForMediaPlayback]));
650 #endif
651
652 #if ENABLE(APPLE_PAY)
653     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::applePayEnabledKey(), WebKit::WebPreferencesStore::Value(!![_configuration _applePayEnabled]));
654 #endif
655
656     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::needsStorageAccessFromFileURLsQuirkKey(), WebKit::WebPreferencesStore::Value(!![_configuration _needsStorageAccessFromFileURLsQuirk]));
657     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::mediaContentTypesRequiringHardwareSupportKey(), WebKit::WebPreferencesStore::Value(String([_configuration _mediaContentTypesRequiringHardwareSupport])));
658     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::allowMediaContentTypesRequiringHardwareSupportAsFallbackKey(), WebKit::WebPreferencesStore::Value(!![_configuration _allowMediaContentTypesRequiringHardwareSupportAsFallback]));
659
660     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::colorFilterEnabledKey(), WebKit::WebPreferencesStore::Value(!![_configuration _colorFilterEnabled]));
661
662     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::editableImagesEnabledKey(), WebKit::WebPreferencesStore::Value(!![_configuration _editableImagesEnabled]));
663     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::undoManagerAPIEnabledKey(), WebKit::WebPreferencesStore::Value(!![_configuration _undoManagerAPIEnabled]));
664
665 #if ENABLE(LEGACY_ENCRYPTED_MEDIA)
666     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::legacyEncryptedMediaAPIEnabledKey(), WebKit::WebPreferencesStore::Value(!![_configuration _legacyEncryptedMediaAPIEnabled]));
667 #endif
668
669 #if PLATFORM(IOS_FAMILY) && ENABLE(SERVICE_WORKER)
670     if (!WTF::processHasEntitlement("com.apple.developer.WebKit.ServiceWorkers"))
671         pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::serviceWorkersEnabledKey(), WebKit::WebPreferencesStore::Value(false));
672 #endif
673
674 #if PLATFORM(IOS_FAMILY)
675     CGRect bounds = self.bounds;
676     _scrollView = adoptNS([[WKScrollView alloc] initWithFrame:bounds]);
677     [_scrollView setInternalDelegate:self];
678     [_scrollView setBouncesZoom:YES];
679
680     if ([_configuration _editableImagesEnabled])
681         [_scrollView panGestureRecognizer].allowedTouchTypes = @[ @(UITouchTypeDirect) ];
682
683     _avoidsUnsafeArea = YES;
684     [self _updateScrollViewInsetAdjustmentBehavior];
685
686     [self addSubview:_scrollView.get()];
687
688     static uint32_t programSDKVersion = dyld_get_program_sdk_version();
689     _allowsLinkPreview = programSDKVersion >= firstSDKVersionWithLinkPreviewEnabledByDefault;
690
691     _contentView = adoptNS([[WKContentView alloc] initWithFrame:bounds processPool:processPool configuration:pageConfiguration.copyRef() webView:self]);
692
693     _page = [_contentView page];
694     [self _dispatchSetDeviceOrientation:deviceOrientation()];
695     if (!self.opaque)
696         _page->setBackgroundColor(WebCore::Color(WebCore::Color::transparent));
697
698     [_contentView layer].anchorPoint = CGPointZero;
699     [_contentView setFrame:bounds];
700     [_scrollView addSubview:_contentView.get()];
701     [_scrollView addSubview:[_contentView unscaledView]];
702     [self _updateScrollViewBackground];
703     _obscuredInsetEdgesAffectedBySafeArea = UIRectEdgeTop | UIRectEdgeLeft | UIRectEdgeRight;
704
705     _viewportMetaTagWidth = WebCore::ViewportArguments::ValueAuto;
706     _initialScaleFactor = 1;
707
708     if (NSNumber *enabledValue = [[NSUserDefaults standardUserDefaults] objectForKey:@"WebKitFastClickingDisabled"])
709         _fastClickingIsDisabled = enabledValue.boolValue;
710     else {
711 #if PLATFORM(WATCHOS)
712         _fastClickingIsDisabled = YES;
713 #else
714         _fastClickingIsDisabled = NO;
715 #endif
716     }
717
718     [self _frameOrBoundsChanged];
719
720     NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
721     [center addObserver:self selector:@selector(_keyboardWillChangeFrame:) name:UIKeyboardWillChangeFrameNotification object:nil];
722     [center addObserver:self selector:@selector(_keyboardDidChangeFrame:) name:UIKeyboardDidChangeFrameNotification object:nil];
723     [center addObserver:self selector:@selector(_keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
724     [center addObserver:self selector:@selector(_keyboardDidShow:) name:UIKeyboardDidShowNotification object:nil];
725     [center addObserver:self selector:@selector(_keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
726     [center addObserver:self selector:@selector(_windowDidRotate:) name:UIWindowDidRotateNotification object:nil];
727     [center addObserver:self selector:@selector(_contentSizeCategoryDidChange:) name:UIContentSizeCategoryDidChangeNotification object:nil];
728     _page->contentSizeCategoryDidChange([self _contentSizeCategory]);
729
730     [center addObserver:self selector:@selector(_accessibilitySettingsDidChange:) name:UIAccessibilityGrayscaleStatusDidChangeNotification object:nil];
731     [center addObserver:self selector:@selector(_accessibilitySettingsDidChange:) name:UIAccessibilityInvertColorsStatusDidChangeNotification object:nil];
732     [center addObserver:self selector:@selector(_accessibilitySettingsDidChange:) name:UIAccessibilityReduceMotionStatusDidChangeNotification object:nil];
733
734     [[_configuration _contentProviderRegistry] addPage:*_page];
735     _page->setForceAlwaysUserScalable([_configuration ignoresViewportScaleLimits]);
736
737     CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(), (__bridge const void *)(self), hardwareKeyboardAvailabilityChangedCallback, (CFStringRef)[NSString stringWithUTF8String:kGSEventHardwareKeyboardAvailabilityChangedNotification], nullptr, CFNotificationSuspensionBehaviorCoalesce);
738 #endif
739
740 #if PLATFORM(MAC)
741     _impl = std::make_unique<WebKit::WebViewImpl>(self, self, processPool, pageConfiguration.copyRef());
742     _page = &_impl->page();
743
744     _impl->setAutomaticallyAdjustsContentInsets(true);
745     _impl->setRequiresUserActionForEditingControlsManager([configuration _requiresUserActionForEditingControlsManager]);
746 #endif
747
748 #if ENABLE(ACCESSIBILITY_EVENTS)
749     // Check _AXSWebAccessibilityEventsEnabled here to avoid compiler optimizing
750     // out the null check of kAXSWebAccessibilityEventsEnabledNotification.
751     if (!isNullFunctionPointer(_AXSWebAccessibilityEventsEnabled))
752         CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(), (__bridge const void *)(self), accessibilityEventsEnabledChangedCallback, kAXSWebAccessibilityEventsEnabledNotification, 0, CFNotificationSuspensionBehaviorDeliverImmediately);
753     [self _updateAccessibilityEventsEnabled];
754 #endif
755
756     if (NSString *applicationNameForUserAgent = configuration.applicationNameForUserAgent)
757         _page->setApplicationNameForUserAgent(applicationNameForUserAgent);
758
759     _navigationState = std::make_unique<WebKit::NavigationState>(self);
760     _page->setNavigationClient(_navigationState->createNavigationClient());
761
762     _uiDelegate = std::make_unique<WebKit::UIDelegate>(self);
763     _page->setFindClient(std::make_unique<WebKit::FindClient>(self));
764     _page->setDiagnosticLoggingClient(std::make_unique<WebKit::DiagnosticLoggingClient>(self));
765
766     _iconLoadingDelegate = std::make_unique<WebKit::IconLoadingDelegate>(self);
767
768     [self _setUpSQLiteDatabaseTrackerClient];
769
770     for (auto& pair : pageConfiguration->urlSchemeHandlers())
771         _page->setURLSchemeHandlerForScheme(WebKit::WebURLSchemeHandlerCocoa::create(static_cast<WebKit::WebURLSchemeHandlerCocoa&>(pair.value.get()).apiHandler()), pair.key);
772
773     pageToViewMap().add(_page.get(), self);
774
775 #if PLATFORM(IOS_FAMILY)
776     _dragInteractionPolicy = _WKDragInteractionPolicyDefault;
777
778     _timeOfRequestForVisibleContentRectUpdate = MonotonicTime::now();
779     _timeOfLastVisibleContentRectUpdate = MonotonicTime::now();
780 #if PLATFORM(WATCHOS)
781     _allowsViewportShrinkToFit = YES;
782 #else
783     _allowsViewportShrinkToFit = NO;
784 #endif
785 #endif // PLATFORM(IOS_FAMILY)
786 }
787
788 - (void)_setUpSQLiteDatabaseTrackerClient
789 {
790 #if PLATFORM(IOS_FAMILY)
791     WebBackgroundTaskController *controller = [WebBackgroundTaskController sharedController];
792     if (controller.backgroundTaskStartBlock)
793         return;
794
795     controller.backgroundTaskStartBlock = ^NSUInteger (void (^expirationHandler)())
796     {
797         return [[UIApplication sharedApplication] beginBackgroundTaskWithName:@"com.apple.WebKit.DatabaseActivity" expirationHandler:expirationHandler];
798     };
799     controller.backgroundTaskEndBlock = ^(UIBackgroundTaskIdentifier taskIdentifier)
800     {
801         [[UIApplication sharedApplication] endBackgroundTask:taskIdentifier];
802     };
803     controller.invalidBackgroundTaskIdentifier = UIBackgroundTaskInvalid;
804
805     WebCore::SQLiteDatabaseTracker::setClient(&WebCore::WebSQLiteDatabaseTrackerClient::sharedWebSQLiteDatabaseTrackerClient());
806 #endif
807 }
808
809 - (instancetype)initWithFrame:(CGRect)frame configuration:(WKWebViewConfiguration *)configuration
810 {
811     if (!(self = [super initWithFrame:frame]))
812         return nil;
813
814     [self _initializeWithConfiguration:configuration];
815
816     return self;
817 }
818
819 - (instancetype)initWithCoder:(NSCoder *)coder
820 {
821     if (!(self = [super initWithCoder:coder]))
822         return nil;
823
824     WKWebViewConfiguration *configuration = decodeObjectOfClassForKeyFromCoder([WKWebViewConfiguration class], @"configuration", coder);
825     [self _initializeWithConfiguration:configuration];
826
827     self.allowsBackForwardNavigationGestures = [coder decodeBoolForKey:@"allowsBackForwardNavigationGestures"];
828     self.customUserAgent = decodeObjectOfClassForKeyFromCoder([NSString class], @"customUserAgent", coder);
829     self.allowsLinkPreview = [coder decodeBoolForKey:@"allowsLinkPreview"];
830
831 #if PLATFORM(MAC)
832     self.allowsMagnification = [coder decodeBoolForKey:@"allowsMagnification"];
833     self.magnification = [coder decodeDoubleForKey:@"magnification"];
834 #endif
835
836     return self;
837 }
838
839 - (void)encodeWithCoder:(NSCoder *)coder
840 {
841     [super encodeWithCoder:coder];
842
843     [coder encodeObject:_configuration.get() forKey:@"configuration"];
844
845     [coder encodeBool:self.allowsBackForwardNavigationGestures forKey:@"allowsBackForwardNavigationGestures"];
846     [coder encodeObject:self.customUserAgent forKey:@"customUserAgent"];
847     [coder encodeBool:self.allowsLinkPreview forKey:@"allowsLinkPreview"];
848
849 #if PLATFORM(MAC)
850     [coder encodeBool:self.allowsMagnification forKey:@"allowsMagnification"];
851     [coder encodeDouble:self.magnification forKey:@"magnification"];
852 #endif
853 }
854
855 - (void)dealloc
856 {
857 #if PLATFORM(MAC)
858     [_textFinderClient willDestroyView:self];
859 #endif
860
861 #if PLATFORM(IOS_FAMILY)
862     [_contentView _webViewDestroyed];
863
864     if (_remoteObjectRegistry)
865         _page->process().processPool().removeMessageReceiver(Messages::RemoteObjectRegistry::messageReceiverName(), _page->pageID());
866 #endif
867
868     _page->close();
869
870 #if PLATFORM(IOS_FAMILY)
871     [_remoteObjectRegistry _invalidate];
872     [[_configuration _contentProviderRegistry] removePage:*_page];
873     [[NSNotificationCenter defaultCenter] removeObserver:self];
874     [_scrollView setInternalDelegate:nil];
875
876     CFNotificationCenterRemoveObserver(CFNotificationCenterGetDarwinNotifyCenter(), (__bridge const void *)(self), (CFStringRef)[NSString stringWithUTF8String:kGSEventHardwareKeyboardAvailabilityChangedNotification], nullptr);
877 #endif
878
879 #if ENABLE(ACCESSIBILITY_EVENTS)
880     CFNotificationCenterRemoveObserver(CFNotificationCenterGetDarwinNotifyCenter(), (__bridge const void *)(self), nullptr, nullptr);
881 #endif
882
883     pageToViewMap().remove(_page.get());
884
885     [super dealloc];
886 }
887
888 - (id)valueForUndefinedKey:(NSString *)key {
889     if ([key isEqualToString:@"serverTrust"])
890         return (__bridge id)[self serverTrust];
891
892     return [super valueForUndefinedKey:key];
893 }
894
895 - (WKWebViewConfiguration *)configuration
896 {
897     return [[_configuration copy] autorelease];
898 }
899
900 - (WKBackForwardList *)backForwardList
901 {
902     return wrapper(_page->backForwardList());
903 }
904
905 - (id <WKNavigationDelegate>)navigationDelegate
906 {
907     return _navigationState->navigationDelegate().autorelease();
908 }
909
910 - (void)setNavigationDelegate:(id <WKNavigationDelegate>)navigationDelegate
911 {
912     _page->setNavigationClient(_navigationState->createNavigationClient());
913     _navigationState->setNavigationDelegate(navigationDelegate);
914 }
915
916 - (id <WKUIDelegate>)UIDelegate
917 {
918     return _uiDelegate->delegate().autorelease();
919 }
920
921 - (void)setUIDelegate:(id<WKUIDelegate>)UIDelegate
922 {
923     _uiDelegate->setDelegate(UIDelegate);
924 #if ENABLE(CONTEXT_MENUS)
925     _page->setContextMenuClient(_uiDelegate->createContextMenuClient());
926 #endif
927     _page->setUIClient(_uiDelegate->createUIClient());
928 }
929
930 - (id <_WKIconLoadingDelegate>)_iconLoadingDelegate
931 {
932     return _iconLoadingDelegate->delegate().autorelease();
933 }
934
935 - (void)_setIconLoadingDelegate:(id<_WKIconLoadingDelegate>)iconLoadingDelegate
936 {
937     _page->setIconLoadingClient(_iconLoadingDelegate->createIconLoadingClient());
938     _iconLoadingDelegate->setDelegate(iconLoadingDelegate);
939 }
940
941 - (WKNavigation *)loadRequest:(NSURLRequest *)request
942 {
943     return wrapper(_page->loadRequest(request));
944 }
945
946 - (WKNavigation *)loadFileURL:(NSURL *)URL allowingReadAccessToURL:(NSURL *)readAccessURL
947 {
948     if (![URL isFileURL])
949         [NSException raise:NSInvalidArgumentException format:@"%@ is not a file URL", URL];
950
951     if (![readAccessURL isFileURL])
952         [NSException raise:NSInvalidArgumentException format:@"%@ is not a file URL", readAccessURL];
953
954     return wrapper(_page->loadFile([URL _web_originalDataAsWTFString], [readAccessURL _web_originalDataAsWTFString]));
955 }
956
957 - (WKNavigation *)loadHTMLString:(NSString *)string baseURL:(NSURL *)baseURL
958 {
959     NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
960
961     return [self loadData:data MIMEType:@"text/html" characterEncodingName:@"UTF-8" baseURL:baseURL];
962 }
963
964 - (WKNavigation *)loadData:(NSData *)data MIMEType:(NSString *)MIMEType characterEncodingName:(NSString *)characterEncodingName baseURL:(NSURL *)baseURL
965 {
966     return wrapper(_page->loadData({ static_cast<const uint8_t*>(data.bytes), data.length }, MIMEType, characterEncodingName, baseURL.absoluteString));
967 }
968
969 - (WKNavigation *)goToBackForwardListItem:(WKBackForwardListItem *)item
970 {
971     return wrapper(_page->goToBackForwardItem(item._item));
972 }
973
974 - (NSString *)title
975 {
976     return _page->pageLoadState().title();
977 }
978
979 - (NSURL *)URL
980 {
981     return [NSURL _web_URLWithWTFString:_page->pageLoadState().activeURL()];
982 }
983
984 - (BOOL)isLoading
985 {
986     return _page->pageLoadState().isLoading();
987 }
988
989 - (double)estimatedProgress
990 {
991     return _page->pageLoadState().estimatedProgress();
992 }
993
994 - (BOOL)hasOnlySecureContent
995 {
996     return _page->pageLoadState().hasOnlySecureContent();
997 }
998
999 - (SecTrustRef)serverTrust
1000 {
1001 #if HAVE(SEC_TRUST_SERIALIZATION)
1002     auto certificateInfo = _page->pageLoadState().certificateInfo();
1003     if (!certificateInfo)
1004         return nil;
1005
1006     return certificateInfo->certificateInfo().trust();
1007 #else
1008     return nil;
1009 #endif
1010 }
1011
1012 - (BOOL)canGoBack
1013 {
1014     return _page->pageLoadState().canGoBack();
1015 }
1016
1017 - (BOOL)canGoForward
1018 {
1019     return _page->pageLoadState().canGoForward();
1020 }
1021
1022 - (WKNavigation *)goBack
1023 {
1024     if (self._safeBrowsingWarning)
1025         return [self reload];
1026     return wrapper(_page->goBack());
1027 }
1028
1029 - (WKNavigation *)goForward
1030 {
1031     return wrapper(_page->goForward());
1032 }
1033
1034 - (WKNavigation *)reload
1035 {
1036     OptionSet<WebCore::ReloadOption> reloadOptions;
1037     if (linkedOnOrAfter(WebKit::SDKVersion::FirstWithExpiredOnlyReloadBehavior))
1038         reloadOptions.add(WebCore::ReloadOption::ExpiredOnly);
1039
1040     return wrapper(_page->reload(reloadOptions));
1041 }
1042
1043 - (WKNavigation *)reloadFromOrigin
1044 {
1045     return wrapper(_page->reload(WebCore::ReloadOption::FromOrigin));
1046 }
1047
1048 - (void)stopLoading
1049 {
1050     _page->stopLoading();
1051 }
1052
1053 static WKErrorCode callbackErrorCode(WebKit::CallbackBase::Error error)
1054 {
1055     switch (error) {
1056     case WebKit::CallbackBase::Error::None:
1057         ASSERT_NOT_REACHED();
1058         return WKErrorUnknown;
1059
1060     case WebKit::CallbackBase::Error::Unknown:
1061         return WKErrorUnknown;
1062
1063     case WebKit::CallbackBase::Error::ProcessExited:
1064         return WKErrorWebContentProcessTerminated;
1065
1066     case WebKit::CallbackBase::Error::OwnerWasInvalidated:
1067         return WKErrorWebViewInvalidated;
1068     }
1069 }
1070
1071 - (void)evaluateJavaScript:(NSString *)javaScriptString completionHandler:(void (^)(id, NSError *))completionHandler
1072 {
1073     [self _evaluateJavaScript:javaScriptString forceUserGesture:YES completionHandler:completionHandler];
1074 }
1075
1076 - (void)_evaluateJavaScript:(NSString *)javaScriptString forceUserGesture:(BOOL)forceUserGesture completionHandler:(void (^)(id, NSError *))completionHandler
1077 {
1078     auto handler = adoptNS([completionHandler copy]);
1079
1080     _page->runJavaScriptInMainFrame(javaScriptString, forceUserGesture, [handler](API::SerializedScriptValue* serializedScriptValue, bool hadException, const WebCore::ExceptionDetails& details, WebKit::ScriptValueCallback::Error errorCode) {
1081         if (!handler)
1082             return;
1083
1084         if (errorCode != WebKit::ScriptValueCallback::Error::None) {
1085             auto error = createNSError(callbackErrorCode(errorCode));
1086             if (errorCode == WebKit::ScriptValueCallback::Error::OwnerWasInvalidated) {
1087                 // The OwnerWasInvalidated callback is synchronous. We don't want to call the block from within it
1088                 // because that can trigger re-entrancy bugs in WebKit.
1089                 // FIXME: It would be even better if GenericCallback did this for us.
1090                 dispatch_async(dispatch_get_main_queue(), [handler, error] {
1091                     auto rawHandler = (void (^)(id, NSError *))handler.get();
1092                     rawHandler(nil, error.get());
1093                 });
1094                 return;
1095             }
1096
1097             auto rawHandler = (void (^)(id, NSError *))handler.get();
1098             rawHandler(nil, error.get());
1099             return;
1100         }
1101
1102         auto rawHandler = (void (^)(id, NSError *))handler.get();
1103         if (hadException) {
1104             ASSERT(!serializedScriptValue);
1105
1106             RetainPtr<NSMutableDictionary> userInfo = adoptNS([[NSMutableDictionary alloc] init]);
1107
1108             [userInfo setObject:localizedDescriptionForErrorCode(WKErrorJavaScriptExceptionOccurred) forKey:NSLocalizedDescriptionKey];
1109             [userInfo setObject:static_cast<NSString *>(details.message) forKey:_WKJavaScriptExceptionMessageErrorKey];
1110             [userInfo setObject:@(details.lineNumber) forKey:_WKJavaScriptExceptionLineNumberErrorKey];
1111             [userInfo setObject:@(details.columnNumber) forKey:_WKJavaScriptExceptionColumnNumberErrorKey];
1112
1113             if (!details.sourceURL.isEmpty())
1114                 [userInfo setObject:[NSURL _web_URLWithWTFString:details.sourceURL] forKey:_WKJavaScriptExceptionSourceURLErrorKey];
1115
1116             rawHandler(nil, adoptNS([[NSError alloc] initWithDomain:WKErrorDomain code:WKErrorJavaScriptExceptionOccurred userInfo:userInfo.get()]).get());
1117             return;
1118         }
1119
1120         if (!serializedScriptValue) {
1121             rawHandler(nil, createNSError(WKErrorJavaScriptResultTypeIsUnsupported).get());
1122             return;
1123         }
1124
1125         id body = API::SerializedScriptValue::deserialize(serializedScriptValue->internalRepresentation(), 0);
1126         rawHandler(body, nil);
1127     });
1128 }
1129
1130 #if PLATFORM(MAC)
1131 - (void)takeSnapshotWithConfiguration:(WKSnapshotConfiguration *)snapshotConfiguration completionHandler:(void(^)(NSImage *, NSError *))completionHandler
1132 {
1133     CGRect rectInViewCoordinates = snapshotConfiguration && !CGRectIsNull(snapshotConfiguration.rect) ? snapshotConfiguration.rect : self.bounds;
1134     CGFloat snapshotWidth;
1135     if (snapshotConfiguration)
1136         snapshotWidth = snapshotConfiguration.snapshotWidth.doubleValue ?: rectInViewCoordinates.size.width;
1137     else
1138         snapshotWidth = self.bounds.size.width;
1139
1140     auto handler = makeBlockPtr(completionHandler);
1141     CGFloat imageScale = snapshotWidth / rectInViewCoordinates.size.width;
1142     CGFloat imageHeight = imageScale * rectInViewCoordinates.size.height;
1143
1144     // Need to scale by device scale factor or the image will be distorted.
1145     CGFloat deviceScale = _page->deviceScaleFactor();
1146     WebCore::IntSize bitmapSize(snapshotWidth, imageHeight);
1147     bitmapSize.scale(deviceScale, deviceScale);
1148
1149     // Software snapshot will not capture elements rendered with hardware acceleration (WebGL, video, etc).
1150     // This code doesn't consider snapshotConfiguration.afterScreenUpdates since the software snapshot always
1151     // contains recent updates. If we ever have a UI-side snapshot mechanism on macOS, we will need to factor
1152     // in snapshotConfiguration.afterScreenUpdates at that time.
1153     _page->takeSnapshot(WebCore::enclosingIntRect(rectInViewCoordinates), bitmapSize, WebKit::SnapshotOptionsInViewCoordinates, [handler, snapshotWidth, imageHeight](const WebKit::ShareableBitmap::Handle& imageHandle, WebKit::CallbackBase::Error errorCode) {
1154         if (errorCode != WebKit::ScriptValueCallback::Error::None) {
1155             auto error = createNSError(callbackErrorCode(errorCode));
1156             handler(nil, error.get());
1157             return;
1158         }
1159
1160         auto bitmap = WebKit::ShareableBitmap::create(imageHandle, WebKit::SharedMemory::Protection::ReadOnly);
1161         RetainPtr<CGImageRef> cgImage = bitmap ? bitmap->makeCGImage() : nullptr;
1162         RetainPtr<NSImage> nsImage = adoptNS([[NSImage alloc] initWithCGImage:cgImage.get() size:NSMakeSize(snapshotWidth, imageHeight)]);
1163         handler(nsImage.get(), nil);
1164     });
1165 }
1166
1167 #elif PLATFORM(IOS_FAMILY)
1168 - (void)takeSnapshotWithConfiguration:(WKSnapshotConfiguration *)snapshotConfiguration completionHandler:(void(^)(UIImage *, NSError *))completionHandler
1169 {
1170     CGRect rectInViewCoordinates = snapshotConfiguration && !CGRectIsNull(snapshotConfiguration.rect) ? snapshotConfiguration.rect : self.bounds;
1171     CGFloat snapshotWidth;
1172     if (snapshotConfiguration)
1173         snapshotWidth = snapshotConfiguration.snapshotWidth.doubleValue ?: rectInViewCoordinates.size.width;
1174     else
1175         snapshotWidth = self.bounds.size.width;
1176
1177     auto handler = makeBlockPtr(completionHandler);
1178     CGFloat deviceScale = _page->deviceScaleFactor();
1179     RetainPtr<WKWebView> strongSelf = self;
1180     auto callSnapshotRect = [strongSelf, rectInViewCoordinates, snapshotWidth, deviceScale, handler] {
1181         [strongSelf _snapshotRect:rectInViewCoordinates intoImageOfWidth:(snapshotWidth * deviceScale) completionHandler:[strongSelf, handler, deviceScale](CGImageRef snapshotImage) {
1182             RetainPtr<NSError> error;
1183             RetainPtr<UIImage> uiImage;
1184             
1185             if (!snapshotImage)
1186                 error = createNSError(WKErrorUnknown);
1187             else
1188                 uiImage = adoptNS([[UIImage alloc] initWithCGImage:snapshotImage scale:deviceScale orientation:UIImageOrientationUp]);
1189             
1190             handler(uiImage.get(), error.get());
1191         }];
1192     };
1193
1194     if ((snapshotConfiguration && !snapshotConfiguration.afterScreenUpdates) || !linkedOnOrAfter(WebKit::SDKVersion::FirstWithSnapshotAfterScreenUpdates)) {
1195         callSnapshotRect();
1196         return;
1197     }
1198
1199     _page->callAfterNextPresentationUpdate([callSnapshotRect = WTFMove(callSnapshotRect), handler](WebKit::CallbackBase::Error error) {
1200         if (error != WebKit::CallbackBase::Error::None) {
1201             handler(nil, createNSError(WKErrorUnknown).get());
1202             return;
1203         }
1204         callSnapshotRect();
1205     });
1206 }
1207 #endif
1208
1209 - (NSString *)customUserAgent
1210 {
1211     return _page->customUserAgent();
1212 }
1213
1214 - (void)setCustomUserAgent:(NSString *)customUserAgent
1215 {
1216     _page->setCustomUserAgent(customUserAgent);
1217 }
1218
1219 - (WKPageRef)_pageForTesting
1220 {
1221     return toAPI(_page.get());
1222 }
1223
1224 - (WebKit::WebPageProxy *)_page
1225 {
1226     return _page.get();
1227 }
1228
1229 - (BOOL)allowsLinkPreview
1230 {
1231 #if PLATFORM(MAC)
1232     return _impl->allowsLinkPreview();
1233 #elif PLATFORM(IOS_FAMILY)
1234     return _allowsLinkPreview;
1235 #endif
1236 }
1237
1238 - (void)setAllowsLinkPreview:(BOOL)allowsLinkPreview
1239 {
1240 #if PLATFORM(MAC)
1241     _impl->setAllowsLinkPreview(allowsLinkPreview);
1242     return;
1243 #elif PLATFORM(IOS_FAMILY)
1244     if (_allowsLinkPreview == allowsLinkPreview)
1245         return;
1246
1247     _allowsLinkPreview = allowsLinkPreview;
1248
1249 #if HAVE(LINK_PREVIEW)
1250     if (_allowsLinkPreview)
1251         [_contentView _registerPreview];
1252     else
1253         [_contentView _unregisterPreview];
1254 #endif // HAVE(LINK_PREVIEW)
1255 #endif // PLATFORM(IOS_FAMILY)
1256 }
1257
1258 - (CGSize)_viewportSizeForCSSViewportUnits
1259 {
1260     return _page->viewportSizeForCSSViewportUnits();
1261 }
1262
1263 - (void)_setViewportSizeForCSSViewportUnits:(CGSize)viewportSize
1264 {
1265     auto viewportSizeForViewportUnits = WebCore::IntSize(viewportSize);
1266     if (viewportSizeForViewportUnits.isEmpty())
1267         [NSException raise:NSInvalidArgumentException format:@"Viewport size should not be empty"];
1268
1269     _page->setViewportSizeForCSSViewportUnits(viewportSizeForViewportUnits);
1270 }
1271
1272 static NSTextAlignment nsTextAlignment(WebKit::TextAlignment alignment)
1273 {
1274     switch (alignment) {
1275     case WebKit::NoAlignment:
1276         return NSTextAlignmentNatural;
1277     case WebKit::LeftAlignment:
1278         return NSTextAlignmentLeft;
1279     case WebKit::RightAlignment:
1280         return NSTextAlignmentRight;
1281     case WebKit::CenterAlignment:
1282         return NSTextAlignmentCenter;
1283     case WebKit::JustifiedAlignment:
1284         return NSTextAlignmentJustified;
1285     }
1286     ASSERT_NOT_REACHED();
1287     return NSTextAlignmentNatural;
1288 }
1289
1290 static NSDictionary *dictionaryRepresentationForEditorState(const WebKit::EditorState& state)
1291 {
1292     if (state.isMissingPostLayoutData)
1293         return @{ @"post-layout-data" : @NO };
1294
1295     auto& postLayoutData = state.postLayoutData();
1296     return @{
1297         @"post-layout-data" : @YES,
1298         @"bold": postLayoutData.typingAttributes & WebKit::AttributeBold ? @YES : @NO,
1299         @"italic": postLayoutData.typingAttributes & WebKit::AttributeItalics ? @YES : @NO,
1300         @"underline": postLayoutData.typingAttributes & WebKit::AttributeUnderline ? @YES : @NO,
1301         @"text-alignment": @(nsTextAlignment(static_cast<WebKit::TextAlignment>(postLayoutData.textAlignment))),
1302         @"text-color": (NSString *)postLayoutData.textColor.cssText()
1303     };
1304 }
1305
1306 static _WKSelectionAttributes selectionAttributes(const WebKit::EditorState& editorState, _WKSelectionAttributes previousAttributes)
1307 {
1308     _WKSelectionAttributes attributes = _WKSelectionAttributeNoSelection;
1309     if (editorState.selectionIsNone)
1310         return attributes;
1311
1312     if (editorState.selectionIsRange)
1313         attributes |= _WKSelectionAttributeIsRange;
1314     else
1315         attributes |= _WKSelectionAttributeIsCaret;
1316
1317     if (!editorState.isMissingPostLayoutData) {
1318 #if PLATFORM(IOS_FAMILY)
1319         if (editorState.postLayoutData().atStartOfSentence)
1320             attributes |= _WKSelectionAttributeAtStartOfSentence;
1321 #endif
1322     } else if (previousAttributes & _WKSelectionAttributeAtStartOfSentence)
1323         attributes |= _WKSelectionAttributeAtStartOfSentence;
1324
1325     return attributes;
1326 }
1327
1328 - (void)_didChangeEditorState
1329 {
1330     auto newSelectionAttributes = selectionAttributes(_page->editorState(), _selectionAttributes);
1331     if (_selectionAttributes != newSelectionAttributes) {
1332         NSString *selectionAttributesKey = NSStringFromSelector(@selector(_selectionAttributes));
1333         [self willChangeValueForKey:selectionAttributesKey];
1334         _selectionAttributes = newSelectionAttributes;
1335         [self didChangeValueForKey:selectionAttributesKey];
1336     }
1337
1338     // FIXME: We should either rename -_webView:editorStateDidChange: to clarify that it's only intended for use when testing,
1339     // or remove it entirely and use -_webView:didChangeFontAttributes: instead once text alignment is supported in the set of
1340     // font attributes.
1341     id <WKUIDelegatePrivate> uiDelegate = (id <WKUIDelegatePrivate>)self.UIDelegate;
1342     if ([uiDelegate respondsToSelector:@selector(_webView:editorStateDidChange:)])
1343         [uiDelegate _webView:self editorStateDidChange:dictionaryRepresentationForEditorState(_page->editorState())];
1344 }
1345
1346 - (_WKSelectionAttributes)_selectionAttributes
1347 {
1348     return _selectionAttributes;
1349 }
1350
1351 - (void)_showSafeBrowsingWarning:(const WebKit::SafeBrowsingWarning&)warning completionHandler:(CompletionHandler<void(Variant<WebKit::ContinueUnsafeLoad, URL>&&)>&&)completionHandler
1352 {
1353     _safeBrowsingWarning = adoptNS([[WKSafeBrowsingWarning alloc] initWithFrame:self.bounds safeBrowsingWarning:warning completionHandler:[weakSelf = WeakObjCPtr<WKWebView>(self), completionHandler = WTFMove(completionHandler)] (auto&& result) mutable {
1354         completionHandler(WTFMove(result));
1355         auto strongSelf = weakSelf.get();
1356         if (!strongSelf)
1357             return;
1358         bool navigatesFrame = WTF::switchOn(result,
1359             [] (WebKit::ContinueUnsafeLoad continueUnsafeLoad) { return continueUnsafeLoad == WebKit::ContinueUnsafeLoad::Yes; },
1360             [] (const URL&) { return true; }
1361         );
1362         bool forMainFrameNavigation = [strongSelf->_safeBrowsingWarning forMainFrameNavigation];
1363         if (navigatesFrame && forMainFrameNavigation) {
1364             // The safe browsing warning will be hidden once the next page is shown.
1365             return;
1366         }
1367         if (!navigatesFrame && strongSelf->_safeBrowsingWarning && !forMainFrameNavigation) {
1368             strongSelf->_page->goBack();
1369             return;
1370         }
1371         [std::exchange(strongSelf->_safeBrowsingWarning, nullptr) removeFromSuperview];
1372     }]);
1373     [self addSubview:_safeBrowsingWarning.get()];
1374 }
1375
1376 - (void)_clearSafeBrowsingWarning
1377 {
1378     [std::exchange(_safeBrowsingWarning, nullptr) removeFromSuperview];
1379 }
1380
1381 - (void)_clearSafeBrowsingWarningIfForMainFrameNavigation
1382 {
1383     if ([_safeBrowsingWarning forMainFrameNavigation])
1384         [self _clearSafeBrowsingWarning];
1385 }
1386
1387 #if ENABLE(ATTACHMENT_ELEMENT)
1388
1389 - (void)_didInsertAttachment:(API::Attachment&)attachment withSource:(NSString *)source
1390 {
1391     id <WKUIDelegatePrivate> uiDelegate = (id <WKUIDelegatePrivate>)self.UIDelegate;
1392     if ([uiDelegate respondsToSelector:@selector(_webView:didInsertAttachment:withSource:)])
1393         [uiDelegate _webView:self didInsertAttachment:wrapper(attachment) withSource:source];
1394 }
1395
1396 - (void)_didRemoveAttachment:(API::Attachment&)attachment
1397 {
1398     id <WKUIDelegatePrivate> uiDelegate = (id <WKUIDelegatePrivate>)self.UIDelegate;
1399     if ([uiDelegate respondsToSelector:@selector(_webView:didRemoveAttachment:)])
1400         [uiDelegate _webView:self didRemoveAttachment:wrapper(attachment)];
1401 }
1402
1403 - (void)_didInvalidateDataForAttachment:(API::Attachment&)attachment
1404 {
1405     id <WKUIDelegatePrivate> uiDelegate = (id <WKUIDelegatePrivate>)self.UIDelegate;
1406     if ([uiDelegate respondsToSelector:@selector(_webView:didInvalidateDataForAttachment:)])
1407         [uiDelegate _webView:self didInvalidateDataForAttachment:wrapper(attachment)];
1408 }
1409
1410 #endif // ENABLE(ATTACHMENT_ELEMENT)
1411
1412 #pragma mark iOS-specific methods
1413
1414 #if PLATFORM(IOS_FAMILY)
1415
1416 - (BOOL)_contentViewIsFirstResponder
1417 {
1418     return self._currentContentView.isFirstResponder;
1419 }
1420
1421 - (_WKDragInteractionPolicy)_dragInteractionPolicy
1422 {
1423     return _dragInteractionPolicy;
1424 }
1425
1426 - (void)_setDragInteractionPolicy:(_WKDragInteractionPolicy)policy
1427 {
1428     if (_dragInteractionPolicy == policy)
1429         return;
1430
1431     _dragInteractionPolicy = policy;
1432 #if ENABLE(DRAG_SUPPORT)
1433     [_contentView _didChangeDragInteractionPolicy];
1434 #endif
1435 }
1436
1437 - (void)_populateArchivedSubviews:(NSMutableSet *)encodedViews
1438 {
1439     [super _populateArchivedSubviews:encodedViews];
1440
1441     if (_scrollView)
1442         [encodedViews removeObject:_scrollView.get()];
1443     if (_customContentFixedOverlayView)
1444         [encodedViews removeObject:_customContentFixedOverlayView.get()];
1445 }
1446
1447 - (BOOL)_isBackground
1448 {
1449     if ([self _isDisplayingPDF])
1450         return [_customContentView web_isBackground];
1451     return [_contentView isBackground];
1452 }
1453
1454 - (void)setFrame:(CGRect)frame
1455 {
1456     CGRect oldFrame = self.frame;
1457     [super setFrame:frame];
1458
1459     if (!CGSizeEqualToSize(oldFrame.size, frame.size))
1460         [self _frameOrBoundsChanged];
1461 }
1462
1463 - (void)setBounds:(CGRect)bounds
1464 {
1465     CGRect oldBounds = self.bounds;
1466     [super setBounds:bounds];
1467     [_customContentFixedOverlayView setFrame:self.bounds];
1468
1469     if (!CGSizeEqualToSize(oldBounds.size, bounds.size))
1470         [self _frameOrBoundsChanged];
1471 }
1472
1473 - (void)layoutSubviews
1474 {
1475     [_safeBrowsingWarning setFrame:self.bounds];
1476     [super layoutSubviews];
1477     [self _frameOrBoundsChanged];
1478 }
1479
1480 - (UIScrollView *)scrollView
1481 {
1482     return _scrollView.get();
1483 }
1484
1485 ALLOW_DEPRECATED_DECLARATIONS_BEGIN
1486 - (WKBrowsingContextController *)browsingContextController
1487 {
1488     return [_contentView browsingContextController];
1489 }
1490 ALLOW_DEPRECATED_DECLARATIONS_END
1491
1492 - (BOOL)becomeFirstResponder
1493 {
1494     UIView *currentContentView = self._currentContentView;
1495     if (currentContentView == _contentView && [_contentView superview])
1496         return [_contentView becomeFirstResponderForWebView] || [super becomeFirstResponder];
1497
1498     return [currentContentView becomeFirstResponder] || [super becomeFirstResponder];
1499 }
1500
1501 - (BOOL)canBecomeFirstResponder
1502 {
1503     if (self._currentContentView == _contentView)
1504         return [_contentView canBecomeFirstResponderForWebView];
1505
1506     return YES;
1507 }
1508
1509 - (BOOL)resignFirstResponder
1510 {
1511     if ([_contentView isFirstResponder])
1512         return [_contentView resignFirstResponderForWebView];
1513
1514     return [super resignFirstResponder];
1515 }
1516
1517 FOR_EACH_WKCONTENTVIEW_ACTION(FORWARD_ACTION_TO_WKCONTENTVIEW)
1518
1519 - (BOOL)canPerformAction:(SEL)action withSender:(id)sender
1520 {
1521     #define FORWARD_CANPERFORMACTION_TO_WKCONTENTVIEW(_action) \
1522         if (action == @selector(_action:)) \
1523             return self.usesStandardContentView && [_contentView canPerformActionForWebView:action withSender:sender];
1524
1525     FOR_EACH_WKCONTENTVIEW_ACTION(FORWARD_CANPERFORMACTION_TO_WKCONTENTVIEW)
1526     FOR_EACH_PRIVATE_WKCONTENTVIEW_ACTION(FORWARD_CANPERFORMACTION_TO_WKCONTENTVIEW)
1527     FORWARD_CANPERFORMACTION_TO_WKCONTENTVIEW(_setTextColor:sender)
1528     FORWARD_CANPERFORMACTION_TO_WKCONTENTVIEW(_setFontSize:sender)
1529     FORWARD_CANPERFORMACTION_TO_WKCONTENTVIEW(_setFont:sender)
1530
1531     #undef FORWARD_CANPERFORMACTION_TO_WKCONTENTVIEW
1532
1533     return [super canPerformAction:action withSender:sender];
1534 }
1535
1536 - (id)targetForAction:(SEL)action withSender:(id)sender
1537 {
1538     #define FORWARD_TARGETFORACTION_TO_WKCONTENTVIEW(_action) \
1539         if (action == @selector(_action:) && self.usesStandardContentView) \
1540             return [_contentView targetForActionForWebView:action withSender:sender];
1541
1542     FOR_EACH_WKCONTENTVIEW_ACTION(FORWARD_TARGETFORACTION_TO_WKCONTENTVIEW)
1543     FOR_EACH_PRIVATE_WKCONTENTVIEW_ACTION(FORWARD_TARGETFORACTION_TO_WKCONTENTVIEW)
1544     FORWARD_TARGETFORACTION_TO_WKCONTENTVIEW(_setTextColor:sender)
1545     FORWARD_TARGETFORACTION_TO_WKCONTENTVIEW(_setFontSize:sender)
1546     FORWARD_TARGETFORACTION_TO_WKCONTENTVIEW(_setFont:sender)
1547
1548     #undef FORWARD_TARGETFORACTION_TO_WKCONTENTVIEW
1549
1550     return [super targetForAction:action withSender:sender];
1551 }
1552
1553 static inline CGFloat floorToDevicePixel(CGFloat input, float deviceScaleFactor)
1554 {
1555     return CGFloor(input * deviceScaleFactor) / deviceScaleFactor;
1556 }
1557
1558 static inline bool pointsEqualInDevicePixels(CGPoint a, CGPoint b, float deviceScaleFactor)
1559 {
1560     return fabs(a.x * deviceScaleFactor - b.x * deviceScaleFactor) < std::numeric_limits<float>::epsilon()
1561         && fabs(a.y * deviceScaleFactor - b.y * deviceScaleFactor) < std::numeric_limits<float>::epsilon();
1562 }
1563
1564 static CGSize roundScrollViewContentSize(const WebKit::WebPageProxy& page, CGSize contentSize)
1565 {
1566     float deviceScaleFactor = page.deviceScaleFactor();
1567     return CGSizeMake(floorToDevicePixel(contentSize.width, deviceScaleFactor), floorToDevicePixel(contentSize.height, deviceScaleFactor));
1568 }
1569
1570 - (UIView *)_currentContentView
1571 {
1572     return _customContentView ? [_customContentView web_contentView] : _contentView.get();
1573 }
1574
1575 - (WKWebViewContentProviderRegistry *)_contentProviderRegistry
1576 {
1577     return [_configuration _contentProviderRegistry];
1578 }
1579
1580 - (WKSelectionGranularity)_selectionGranularity
1581 {
1582     return [_configuration selectionGranularity];
1583 }
1584
1585 - (void)_setHasCustomContentView:(BOOL)pageHasCustomContentView loadedMIMEType:(const WTF::String&)mimeType
1586 {
1587     if (pageHasCustomContentView) {
1588         [_customContentView removeFromSuperview];
1589         [_customContentFixedOverlayView removeFromSuperview];
1590
1591         Class representationClass = [[_configuration _contentProviderRegistry] providerForMIMEType:mimeType];
1592         ASSERT(representationClass);
1593         _customContentView = adoptNS([[representationClass alloc] web_initWithFrame:self.bounds webView:self mimeType:mimeType]);
1594         _customContentFixedOverlayView = adoptNS([[UIView alloc] initWithFrame:self.bounds]);
1595         [_customContentFixedOverlayView layer].name = @"CustomContentFixedOverlay";
1596         [_customContentFixedOverlayView setUserInteractionEnabled:NO];
1597
1598         [[_contentView unscaledView] removeFromSuperview];
1599         [_contentView removeFromSuperview];
1600         [_scrollView addSubview:_customContentView.get()];
1601         [self addSubview:_customContentFixedOverlayView.get()];
1602
1603         [_customContentView web_setMinimumSize:self.bounds.size];
1604         [_customContentView web_setFixedOverlayView:_customContentFixedOverlayView.get()];
1605
1606         _scrollViewBackgroundColor = WebCore::Color();
1607         [_scrollView setContentOffset:[self _initialContentOffsetForScrollView]];
1608
1609         [self _setAvoidsUnsafeArea:NO];
1610     } else if (_customContentView) {
1611         [_customContentView removeFromSuperview];
1612         _customContentView = nullptr;
1613
1614         [_customContentFixedOverlayView removeFromSuperview];
1615         _customContentFixedOverlayView = nullptr;
1616
1617         [_scrollView addSubview:_contentView.get()];
1618         [_scrollView addSubview:[_contentView unscaledView]];
1619         [_scrollView setContentSize:roundScrollViewContentSize(*_page, [_contentView frame].size)];
1620
1621         [_customContentFixedOverlayView setFrame:self.bounds];
1622         [self addSubview:_customContentFixedOverlayView.get()];
1623     }
1624
1625     if (self.isFirstResponder) {
1626         UIView *currentContentView = self._currentContentView;
1627         if (currentContentView == _contentView ? [_contentView canBecomeFirstResponderForWebView] : currentContentView.canBecomeFirstResponder)
1628             [currentContentView becomeFirstResponder];
1629     }
1630 }
1631
1632 - (void)_didFinishLoadingDataForCustomContentProviderWithSuggestedFilename:(const String&)suggestedFilename data:(NSData *)data
1633 {
1634     ASSERT(_customContentView);
1635     [_customContentView web_setContentProviderData:data suggestedFilename:suggestedFilename];
1636
1637     // FIXME: It may make more sense for custom content providers to invoke this when they're ready,
1638     // because there's no guarantee that all custom content providers will lay out synchronously.
1639     _page->didLayoutForCustomContentProvider();
1640 }
1641
1642 - (void)_handleKeyUIEvent:(::UIEvent *)event
1643 {
1644     // We only want to handle key events from the hardware keyboard when we are
1645     // first responder and a custom content view is installed; otherwise,
1646     // WKContentView will be the first responder and expects to get key events directly.
1647     if ([self isFirstResponder] && event._hidEvent) {
1648         if ([_customContentView respondsToSelector:@selector(web_handleKeyEvent:)]) {
1649             if ([_customContentView web_handleKeyEvent:event])
1650                 return;
1651         }
1652     }
1653
1654     [super _handleKeyUIEvent:event];
1655 }
1656
1657 - (void)_willInvokeUIScrollViewDelegateCallback
1658 {
1659     _delayUpdateVisibleContentRects = YES;
1660 }
1661
1662 - (void)_didInvokeUIScrollViewDelegateCallback
1663 {
1664     _delayUpdateVisibleContentRects = NO;
1665     if (_hadDelayedUpdateVisibleContentRects) {
1666         _hadDelayedUpdateVisibleContentRects = NO;
1667         [self _scheduleVisibleContentRectUpdate];
1668     }
1669 }
1670
1671 static CGFloat contentZoomScale(WKWebView *webView)
1672 {
1673     CGFloat scale = webView._currentContentView.layer.affineTransform.a;
1674     ASSERT(scale == [webView->_scrollView zoomScale]);
1675     return scale;
1676 }
1677
1678 static WebCore::Color baseScrollViewBackgroundColor(WKWebView *webView)
1679 {
1680     if (webView->_customContentView)
1681         return [webView->_customContentView backgroundColor].CGColor;
1682
1683     if (webView->_gestureController) {
1684         WebCore::Color color = webView->_gestureController->backgroundColorForCurrentSnapshot();
1685         if (color.isValid())
1686             return color;
1687     }
1688
1689     return webView->_page->pageExtendedBackgroundColor();
1690 }
1691
1692 static WebCore::Color scrollViewBackgroundColor(WKWebView *webView)
1693 {
1694     if (!webView.opaque)
1695         return WebCore::Color::transparent;
1696
1697     WebCore::Color color = baseScrollViewBackgroundColor(webView);
1698
1699     if (!color.isValid())
1700         color = [webView->_contentView backgroundColor].CGColor;
1701
1702     CGFloat zoomScale = contentZoomScale(webView);
1703     CGFloat minimumZoomScale = [webView->_scrollView minimumZoomScale];
1704     if (zoomScale < minimumZoomScale) {
1705         CGFloat slope = 12;
1706         CGFloat opacity = std::max<CGFloat>(1 - slope * (minimumZoomScale - zoomScale), 0);
1707         color = WebCore::colorWithOverrideAlpha(color.rgb(), opacity);
1708     }
1709
1710     return color;
1711 }
1712
1713 - (void)_updateScrollViewBackground
1714 {
1715     WebCore::Color color = scrollViewBackgroundColor(self);
1716
1717     if (_scrollViewBackgroundColor == color)
1718         return;
1719
1720     _scrollViewBackgroundColor = color;
1721
1722     auto uiBackgroundColor = adoptNS([[UIColor alloc] initWithCGColor:cachedCGColor(color)]);
1723     [_scrollView setBackgroundColor:uiBackgroundColor.get()];
1724
1725     // Update the indicator style based on the lightness/darkness of the background color.
1726     double hue, saturation, lightness;
1727     color.getHSL(hue, saturation, lightness);
1728     if (lightness <= .5 && color.isVisible())
1729         [_scrollView setIndicatorStyle:UIScrollViewIndicatorStyleWhite];
1730     else
1731         [_scrollView setIndicatorStyle:UIScrollViewIndicatorStyleDefault];
1732 }
1733
1734 - (void)_videoControlsManagerDidChange
1735 {
1736 #if ENABLE(FULLSCREEN_API)
1737     if (_fullScreenWindowController)
1738         [_fullScreenWindowController videoControlsManagerDidChange];
1739 #endif
1740 }
1741
1742 - (CGPoint)_initialContentOffsetForScrollView
1743 {
1744     auto combinedUnobscuredAndScrollViewInset = [self _computedContentInset];
1745     return CGPointMake(-combinedUnobscuredAndScrollViewInset.left, -combinedUnobscuredAndScrollViewInset.top);
1746 }
1747
1748 - (CGPoint)_contentOffsetAdjustedForObscuredInset:(CGPoint)point
1749 {
1750     CGPoint result = point;
1751     UIEdgeInsets contentInset = [self _computedObscuredInset];
1752
1753     result.x -= contentInset.left;
1754     result.y -= contentInset.top;
1755
1756     return result;
1757 }
1758
1759 - (UIRectEdge)_effectiveObscuredInsetEdgesAffectedBySafeArea
1760 {
1761     if (![self usesStandardContentView])
1762         return UIRectEdgeAll;
1763     return _obscuredInsetEdgesAffectedBySafeArea;
1764 }
1765
1766 - (UIEdgeInsets)_computedObscuredInset
1767 {
1768     if (!linkedOnOrAfter(WebKit::SDKVersion::FirstWhereScrollViewContentInsetsAreNotObscuringInsets)) {
1769         // For binary compability with third party apps, treat scroll view content insets as obscuring insets when the app is compiled
1770         // against a WebKit version without the fix in r229641.
1771         return [self _computedContentInset];
1772     }
1773
1774     if (_haveSetObscuredInsets)
1775         return _obscuredInsets;
1776
1777 #if PLATFORM(IOS)
1778     if (self._safeAreaShouldAffectObscuredInsets)
1779         return UIEdgeInsetsAdd(UIEdgeInsetsZero, self._scrollViewSystemContentInset, self._effectiveObscuredInsetEdgesAffectedBySafeArea);
1780 #endif
1781
1782     return UIEdgeInsetsZero;
1783 }
1784
1785 - (UIEdgeInsets)_computedContentInset
1786 {
1787     if (_haveSetObscuredInsets)
1788         return _obscuredInsets;
1789
1790     UIEdgeInsets insets = [_scrollView contentInset];
1791
1792 #if PLATFORM(IOS)
1793     if (self._safeAreaShouldAffectObscuredInsets)
1794         insets = UIEdgeInsetsAdd(insets, self._scrollViewSystemContentInset, self._effectiveObscuredInsetEdgesAffectedBySafeArea);
1795 #endif
1796
1797     return insets;
1798 }
1799
1800 - (UIEdgeInsets)_computedUnobscuredSafeAreaInset
1801 {
1802     if (_haveSetUnobscuredSafeAreaInsets)
1803         return _unobscuredSafeAreaInsets;
1804
1805 #if PLATFORM(IOS)
1806     if (!self._safeAreaShouldAffectObscuredInsets)
1807         return self.safeAreaInsets;
1808 #endif
1809
1810     return UIEdgeInsetsZero;
1811 }
1812
1813 - (void)_processWillSwapOrDidExit
1814 {
1815     // FIXME: Which ones of these need to be done in the process swap case and which ones in the exit case?
1816     [self _hidePasswordView];
1817     [self _cancelAnimatedResize];
1818
1819     _viewportMetaTagWidth = WebCore::ViewportArguments::ValueAuto;
1820     _initialScaleFactor = 1;
1821     _hasCommittedLoadForMainFrame = NO;
1822     _needsResetViewStateAfterCommitLoadForMainFrame = NO;
1823     _dynamicViewportUpdateMode = WebKit::DynamicViewportUpdateMode::NotResizing;
1824     _waitingForEndAnimatedResize = NO;
1825     _waitingForCommitAfterAnimatedResize = NO;
1826     _animatedResizeOriginalContentWidth = 0;
1827     [_contentView setHidden:NO];
1828     _scrollOffsetToRestore = WTF::nullopt;
1829     _unobscuredCenterToRestore = WTF::nullopt;
1830     _scrollViewBackgroundColor = WebCore::Color();
1831     _delayUpdateVisibleContentRects = NO;
1832     _hadDelayedUpdateVisibleContentRects = NO;
1833     _currentlyAdjustingScrollViewInsetsForKeyboard = NO;
1834     _lastSentViewLayoutSize = WTF::nullopt;
1835     _lastSentMaximumUnobscuredSize = WTF::nullopt;
1836     _lastSentDeviceOrientation = WTF::nullopt;
1837
1838     _frozenVisibleContentRect = WTF::nullopt;
1839     _frozenUnobscuredContentRect = WTF::nullopt;
1840
1841     _firstPaintAfterCommitLoadTransactionID = 0;
1842     _firstTransactionIDAfterPageRestore = WTF::nullopt;
1843
1844     _hasScheduledVisibleRectUpdate = NO;
1845     _commitDidRestoreScrollPosition = NO;
1846
1847     _avoidsUnsafeArea = YES;
1848 }
1849
1850 - (void)_processWillSwap
1851 {
1852     RELEASE_LOG_IF_ALLOWED("%p -[WKWebView _processWillSwap]", self);
1853     [self _processWillSwapOrDidExit];
1854     if (_gestureController)
1855         _gestureController->disconnectFromProcess();
1856 }
1857
1858 - (void)_processDidExit
1859 {
1860     RELEASE_LOG_IF_ALLOWED("%p -[WKWebView _processDidExit]", self);
1861
1862     [self _processWillSwapOrDidExit];
1863
1864     [_contentView setFrame:self.bounds];
1865     [_scrollView setBackgroundColor:[_contentView backgroundColor]];
1866     [_scrollView setContentOffset:[self _initialContentOffsetForScrollView]];
1867     [_scrollView setZoomScale:1];
1868     _gestureController = nullptr;
1869 }
1870
1871 - (void)_didRelaunchProcess
1872 {
1873     RELEASE_LOG_IF_ALLOWED("%p -[WKWebView _didRelaunchProcess]", self);
1874     _hasScheduledVisibleRectUpdate = NO;
1875     _visibleContentRectUpdateScheduledFromScrollViewInStableState = YES;
1876     if (_gestureController)
1877         _gestureController->connectToProcess();
1878 }
1879
1880 - (void)_didCommitLoadForMainFrame
1881 {
1882     _firstPaintAfterCommitLoadTransactionID = downcast<WebKit::RemoteLayerTreeDrawingAreaProxy>(*_page->drawingArea()).nextLayerTreeTransactionID();
1883
1884     _hasCommittedLoadForMainFrame = YES;
1885     _needsResetViewStateAfterCommitLoadForMainFrame = YES;
1886
1887     [_scrollView _stopScrollingAndZoomingAnimations];
1888 }
1889
1890 static CGPoint contentOffsetBoundedInValidRange(UIScrollView *scrollView, CGPoint contentOffset)
1891 {
1892 #if __IPHONE_OS_VERSION_MIN_REQUIRED >= 110000
1893     UIEdgeInsets contentInsets = scrollView.adjustedContentInset;
1894 #else
1895     UIEdgeInsets contentInsets = scrollView.contentInset;
1896 #endif
1897
1898     CGSize contentSize = scrollView.contentSize;
1899     CGSize scrollViewSize = scrollView.bounds.size;
1900
1901     CGPoint minimumContentOffset = CGPointMake(-contentInsets.left, -contentInsets.top);
1902     CGPoint maximumContentOffset = CGPointMake(std::max(minimumContentOffset.x, contentSize.width + contentInsets.right - scrollViewSize.width), std::max(minimumContentOffset.y, contentSize.height + contentInsets.bottom - scrollViewSize.height));
1903
1904     return CGPointMake(std::max(std::min(contentOffset.x, maximumContentOffset.x), minimumContentOffset.x), std::max(std::min(contentOffset.y, maximumContentOffset.y), minimumContentOffset.y));
1905 }
1906
1907 static void changeContentOffsetBoundedInValidRange(UIScrollView *scrollView, WebCore::FloatPoint contentOffset)
1908 {
1909     scrollView.contentOffset = contentOffsetBoundedInValidRange(scrollView, contentOffset);
1910 }
1911
1912 - (WebCore::FloatRect)visibleRectInViewCoordinates
1913 {
1914     WebCore::FloatRect bounds = self.bounds;
1915     bounds.moveBy([_scrollView contentOffset]);
1916     WebCore::FloatRect contentViewBounds = [_contentView bounds];
1917     bounds.intersect(contentViewBounds);
1918     return bounds;
1919 }
1920
1921 // WebCore stores the page scale factor as float instead of double. When we get a scale from WebCore,
1922 // we need to ignore differences that are within a small rounding error on floats.
1923 static inline bool areEssentiallyEqualAsFloat(float a, float b)
1924 {
1925     return WTF::areEssentiallyEqual(a, b);
1926 }
1927
1928 - (void)_didCommitLayerTreeDuringAnimatedResize:(const WebKit::RemoteLayerTreeTransaction&)layerTreeTransaction
1929 {
1930     auto updateID = layerTreeTransaction.dynamicViewportSizeUpdateID();
1931     if (updateID && *updateID == _currentDynamicViewportSizeUpdateID) {
1932         double pageScale = layerTreeTransaction.pageScaleFactor();
1933         WebCore::IntPoint scrollPosition = layerTreeTransaction.scrollPosition();
1934
1935         CGFloat animatingScaleTarget = [[_resizeAnimationView layer] transform].m11;
1936         double currentTargetScale = animatingScaleTarget * [[_contentView layer] transform].m11;
1937         double scale = pageScale / currentTargetScale;
1938         _resizeAnimationTransformAdjustments = CATransform3DMakeScale(scale, scale, 1);
1939
1940         CGPoint newContentOffset = [self _contentOffsetAdjustedForObscuredInset:CGPointMake(scrollPosition.x() * pageScale, scrollPosition.y() * pageScale)];
1941         CGPoint currentContentOffset = [_scrollView contentOffset];
1942
1943         _resizeAnimationTransformAdjustments.m41 = (currentContentOffset.x - newContentOffset.x) / animatingScaleTarget;
1944         _resizeAnimationTransformAdjustments.m42 = (currentContentOffset.y - newContentOffset.y) / animatingScaleTarget;
1945
1946         [_resizeAnimationView layer].sublayerTransform = _resizeAnimationTransformAdjustments;
1947
1948         // If we've already passed endAnimatedResize, immediately complete
1949         // the resize when we have an up-to-date layer tree. Otherwise,
1950         // we will defer completion until endAnimatedResize.
1951         _waitingForCommitAfterAnimatedResize = NO;
1952         if (!_waitingForEndAnimatedResize)
1953             [self _didCompleteAnimatedResize];
1954
1955         return;
1956     }
1957
1958     // If a commit arrives during the live part of a resize but before the
1959     // layer tree takes the current resize into account, it could change the
1960     // WKContentView's size. Update the resizeAnimationView's scale to ensure
1961     // we continue to fill the width of the resize target.
1962
1963     if (_waitingForEndAnimatedResize)
1964         return;
1965
1966     auto newViewLayoutSize = [self activeViewLayoutSize:self.bounds];
1967     CGFloat resizeAnimationViewScale = _animatedResizeOriginalContentWidth / newViewLayoutSize.width();
1968     [[_resizeAnimationView layer] setSublayerTransform:CATransform3DMakeScale(resizeAnimationViewScale, resizeAnimationViewScale, 1)];
1969 }
1970
1971 - (void)_didCommitLayerTree:(const WebKit::RemoteLayerTreeTransaction&)layerTreeTransaction
1972 {
1973     if (![self usesStandardContentView])
1974         return;
1975
1976     LOG_WITH_STREAM(VisibleRects, stream << "-[WKWebView " << _page->pageID() << " _didCommitLayerTree:] transactionID " <<  layerTreeTransaction.transactionID() << " _dynamicViewportUpdateMode " << (int)_dynamicViewportUpdateMode);
1977
1978     bool needUpdateVisibleContentRects = _page->updateLayoutViewportParameters(layerTreeTransaction);
1979
1980     if (_dynamicViewportUpdateMode != WebKit::DynamicViewportUpdateMode::NotResizing) {
1981         [self _didCommitLayerTreeDuringAnimatedResize:layerTreeTransaction];
1982         return;
1983     }
1984
1985     if (_resizeAnimationView)
1986         RELEASE_LOG_IF_ALLOWED("%p -[WKWebView _didCommitLayerTree:] - dynamicViewportUpdateMode is NotResizing, but still have a live resizeAnimationView (unpaired begin/endAnimatedResize?)", self);
1987
1988     CGSize newContentSize = roundScrollViewContentSize(*_page, [_contentView frame].size);
1989     [_scrollView _setContentSizePreservingContentOffsetDuringRubberband:newContentSize];
1990
1991     [_scrollView setMinimumZoomScale:layerTreeTransaction.minimumScaleFactor()];
1992     [_scrollView setMaximumZoomScale:layerTreeTransaction.maximumScaleFactor()];
1993     [_scrollView setZoomEnabled:layerTreeTransaction.allowsUserScaling()];
1994     if (!layerTreeTransaction.scaleWasSetByUIProcess() && ![_scrollView isZooming] && ![_scrollView isZoomBouncing] && ![_scrollView _isAnimatingZoom] && [_scrollView zoomScale] != layerTreeTransaction.pageScaleFactor()) {
1995         LOG_WITH_STREAM(VisibleRects, stream << " updating scroll view with pageScaleFactor " << layerTreeTransaction.pageScaleFactor());
1996         [_scrollView setZoomScale:layerTreeTransaction.pageScaleFactor()];
1997     }
1998
1999     _viewportMetaTagWidth = layerTreeTransaction.viewportMetaTagWidth();
2000     _viewportMetaTagWidthWasExplicit = layerTreeTransaction.viewportMetaTagWidthWasExplicit();
2001     _viewportMetaTagCameFromImageDocument = layerTreeTransaction.viewportMetaTagCameFromImageDocument();
2002     _initialScaleFactor = layerTreeTransaction.initialScaleFactor();
2003     if (_page->inStableState() && layerTreeTransaction.isInStableState() && [_stableStatePresentationUpdateCallbacks count]) {
2004         for (dispatch_block_t action in _stableStatePresentationUpdateCallbacks.get())
2005             action();
2006
2007         [_stableStatePresentationUpdateCallbacks removeAllObjects];
2008         _stableStatePresentationUpdateCallbacks = nil;
2009     }
2010
2011     if (![_contentView _mayDisableDoubleTapGesturesDuringSingleTap])
2012         [_contentView _setDoubleTapGesturesEnabled:self._allowsDoubleTapGestures];
2013
2014     [self _updateScrollViewBackground];
2015     [self _setAvoidsUnsafeArea:layerTreeTransaction.avoidsUnsafeArea()];
2016
2017     if (_gestureController)
2018         _gestureController->setRenderTreeSize(layerTreeTransaction.renderTreeSize());
2019
2020     if (_needsResetViewStateAfterCommitLoadForMainFrame && layerTreeTransaction.transactionID() >= _firstPaintAfterCommitLoadTransactionID) {
2021         _needsResetViewStateAfterCommitLoadForMainFrame = NO;
2022         [_scrollView setContentOffset:[self _initialContentOffsetForScrollView]];
2023         if (_observedRenderingProgressEvents & _WKRenderingProgressEventFirstPaint)
2024             _navigationState->didFirstPaint();
2025
2026         needUpdateVisibleContentRects = true;
2027     }
2028
2029     if (_firstTransactionIDAfterPageRestore && layerTreeTransaction.transactionID() >= _firstTransactionIDAfterPageRestore.value()) {
2030         if (_scrollOffsetToRestore) {
2031             WebCore::FloatPoint scaledScrollOffset = _scrollOffsetToRestore.value();
2032             _scrollOffsetToRestore = WTF::nullopt;
2033
2034             if (areEssentiallyEqualAsFloat(contentZoomScale(self), _scaleToRestore)) {
2035                 scaledScrollOffset.scale(_scaleToRestore);
2036                 WebCore::FloatPoint contentOffsetInScrollViewCoordinates = scaledScrollOffset - WebCore::FloatSize(_obscuredInsetsWhenSaved.left(), _obscuredInsetsWhenSaved.top());
2037
2038                 changeContentOffsetBoundedInValidRange(_scrollView.get(), contentOffsetInScrollViewCoordinates);
2039                 _commitDidRestoreScrollPosition = YES;
2040             }
2041
2042             needUpdateVisibleContentRects = true;
2043         }
2044
2045         if (_unobscuredCenterToRestore) {
2046             WebCore::FloatPoint unobscuredCenterToRestore = _unobscuredCenterToRestore.value();
2047             _unobscuredCenterToRestore = WTF::nullopt;
2048
2049             if (areEssentiallyEqualAsFloat(contentZoomScale(self), _scaleToRestore)) {
2050                 CGRect unobscuredRect = UIEdgeInsetsInsetRect(self.bounds, _obscuredInsets);
2051                 WebCore::FloatSize unobscuredContentSizeAtNewScale = WebCore::FloatSize(unobscuredRect.size) / _scaleToRestore;
2052                 WebCore::FloatPoint topLeftInDocumentCoordinates = unobscuredCenterToRestore - unobscuredContentSizeAtNewScale / 2;
2053
2054                 topLeftInDocumentCoordinates.scale(_scaleToRestore);
2055                 topLeftInDocumentCoordinates.moveBy(WebCore::FloatPoint(-_obscuredInsets.left, -_obscuredInsets.top));
2056
2057                 changeContentOffsetBoundedInValidRange(_scrollView.get(), topLeftInDocumentCoordinates);
2058             }
2059
2060             needUpdateVisibleContentRects = true;
2061         }
2062
2063         if (_gestureController)
2064             _gestureController->didRestoreScrollPosition();
2065
2066         _firstTransactionIDAfterPageRestore = WTF::nullopt;
2067     }
2068
2069     if (needUpdateVisibleContentRects)
2070         [self _scheduleVisibleContentRectUpdate];
2071
2072     if (WebKit::RemoteLayerTreeScrollingPerformanceData* scrollPerfData = _page->scrollingPerformanceData())
2073         scrollPerfData->didCommitLayerTree([self visibleRectInViewCoordinates]);
2074 }
2075
2076 - (void)_layerTreeCommitComplete
2077 {
2078     _commitDidRestoreScrollPosition = NO;
2079 }
2080
2081 - (void)_couldNotRestorePageState
2082 {
2083     // The gestureController may be waiting for the scroll position to be restored
2084     // in order to remove the swipe snapshot. Since the scroll position could not be
2085     // restored, tell the gestureController it was restored so that it no longer waits
2086     // for it.
2087     if (_gestureController)
2088         _gestureController->didRestoreScrollPosition();
2089 }
2090
2091 - (void)_restorePageScrollPosition:(Optional<WebCore::FloatPoint>)scrollPosition scrollOrigin:(WebCore::FloatPoint)scrollOrigin previousObscuredInset:(WebCore::FloatBoxExtent)obscuredInsets scale:(double)scale
2092 {
2093     if (_dynamicViewportUpdateMode != WebKit::DynamicViewportUpdateMode::NotResizing)
2094         return;
2095
2096     if (![self usesStandardContentView])
2097         return;
2098
2099     _firstTransactionIDAfterPageRestore = downcast<WebKit::RemoteLayerTreeDrawingAreaProxy>(*_page->drawingArea()).nextLayerTreeTransactionID();
2100     if (scrollPosition)
2101         _scrollOffsetToRestore = WebCore::ScrollableArea::scrollOffsetFromPosition(WebCore::FloatPoint(scrollPosition.value()), WebCore::toFloatSize(scrollOrigin));
2102     else
2103         _scrollOffsetToRestore = WTF::nullopt;
2104
2105     _obscuredInsetsWhenSaved = obscuredInsets;
2106     _scaleToRestore = scale;
2107 }
2108
2109 - (void)_restorePageStateToUnobscuredCenter:(Optional<WebCore::FloatPoint>)center scale:(double)scale
2110 {
2111     if (_dynamicViewportUpdateMode != WebKit::DynamicViewportUpdateMode::NotResizing)
2112         return;
2113
2114     if (![self usesStandardContentView])
2115         return;
2116
2117     _firstTransactionIDAfterPageRestore = downcast<WebKit::RemoteLayerTreeDrawingAreaProxy>(*_page->drawingArea()).nextLayerTreeTransactionID();
2118     _unobscuredCenterToRestore = center;
2119
2120     _scaleToRestore = scale;
2121 }
2122
2123 - (RefPtr<WebKit::ViewSnapshot>)_takeViewSnapshot
2124 {
2125 #if HAVE(CORE_ANIMATION_RENDER_SERVER)
2126     float deviceScale = WebCore::screenScaleFactor();
2127     WebCore::FloatSize snapshotSize(self.bounds.size);
2128     snapshotSize.scale(deviceScale);
2129
2130     CATransform3D transform = CATransform3DMakeScale(deviceScale, deviceScale, 1);
2131
2132 #if HAVE(IOSURFACE)
2133     WebCore::IOSurface::Format snapshotFormat = WebCore::screenSupportsExtendedColor() ? WebCore::IOSurface::Format::RGB10 : WebCore::IOSurface::Format::RGBA;
2134     auto surface = WebCore::IOSurface::create(WebCore::expandedIntSize(snapshotSize), WebCore::sRGBColorSpaceRef(), snapshotFormat);
2135     if (!surface)
2136         return nullptr;
2137     CARenderServerRenderLayerWithTransform(MACH_PORT_NULL, self.layer.context.contextId, reinterpret_cast<uint64_t>(self.layer), surface->surface(), 0, 0, &transform);
2138
2139 #if HAVE(IOSURFACE_ACCELERATOR)
2140     WebCore::IOSurface::Format compressedFormat = WebCore::IOSurface::Format::YUV422;
2141     if (WebCore::IOSurface::allowConversionFromFormatToFormat(snapshotFormat, compressedFormat)) {
2142         auto viewSnapshot = WebKit::ViewSnapshot::create(nullptr);
2143         WebCore::IOSurface::convertToFormat(WTFMove(surface), WebCore::IOSurface::Format::YUV422, [viewSnapshot = viewSnapshot.copyRef()](std::unique_ptr<WebCore::IOSurface> convertedSurface) {
2144             if (convertedSurface)
2145                 viewSnapshot->setSurface(WTFMove(convertedSurface));
2146         });
2147
2148         return viewSnapshot;
2149     }
2150 #endif // HAVE(IOSURFACE_ACCELERATOR)
2151
2152     return WebKit::ViewSnapshot::create(WTFMove(surface));
2153 #else // HAVE(IOSURFACE)
2154     uint32_t slotID = [WebKit::ViewSnapshotStore::snapshottingContext() createImageSlot:snapshotSize hasAlpha:YES];
2155
2156     if (!slotID)
2157         return nullptr;
2158
2159     CARenderServerCaptureLayerWithTransform(MACH_PORT_NULL, self.layer.context.contextId, (uint64_t)self.layer, slotID, 0, 0, &transform);
2160     WebCore::IntSize imageSize = WebCore::expandedIntSize(WebCore::FloatSize(snapshotSize));
2161     return WebKit::ViewSnapshot::create(slotID, imageSize, (imageSize.area() * 4).unsafeGet());
2162 #endif // HAVE(IOSURFACE)
2163 #else // HAVE(CORE_ANIMATION_RENDER_SERVER)
2164     return nullptr;
2165 #endif
2166 }
2167
2168 - (void)_zoomToPoint:(WebCore::FloatPoint)point atScale:(double)scale animated:(BOOL)animated
2169 {
2170     CFTimeInterval duration = 0;
2171     CGFloat zoomScale = contentZoomScale(self);
2172
2173     if (animated) {
2174         const double maximumZoomDuration = 0.4;
2175         const double minimumZoomDuration = 0.1;
2176         const double zoomDurationFactor = 0.3;
2177
2178         duration = std::min(fabs(log(zoomScale) - log(scale)) * zoomDurationFactor + minimumZoomDuration, maximumZoomDuration);
2179     }
2180
2181     if (scale != zoomScale)
2182         _page->willStartUserTriggeredZooming();
2183
2184     LOG_WITH_STREAM(VisibleRects, stream << "_zoomToPoint:" << point << " scale: " << scale << " duration:" << duration);
2185
2186     [_scrollView _zoomToCenter:point scale:scale duration:duration];
2187 }
2188
2189 - (void)_zoomToRect:(WebCore::FloatRect)targetRect atScale:(double)scale origin:(WebCore::FloatPoint)origin animated:(BOOL)animated
2190 {
2191     // FIXME: Some of this could be shared with _scrollToRect.
2192     const double visibleRectScaleChange = contentZoomScale(self) / scale;
2193     const WebCore::FloatRect visibleRect([self convertRect:self.bounds toView:self._currentContentView]);
2194     const WebCore::FloatRect unobscuredRect([self _contentRectForUserInteraction]);
2195
2196     const WebCore::FloatSize topLeftObscuredInsetAfterZoom((unobscuredRect.minXMinYCorner() - visibleRect.minXMinYCorner()) * visibleRectScaleChange);
2197     const WebCore::FloatSize bottomRightObscuredInsetAfterZoom((visibleRect.maxXMaxYCorner() - unobscuredRect.maxXMaxYCorner()) * visibleRectScaleChange);
2198
2199     const WebCore::FloatSize unobscuredRectSizeAfterZoom(unobscuredRect.size() * visibleRectScaleChange);
2200
2201     // Center to the target rect.
2202     WebCore::FloatPoint unobscuredRectLocationAfterZoom = targetRect.location() - (unobscuredRectSizeAfterZoom - targetRect.size()) * 0.5;
2203
2204     // Center to the tap point instead in case the target rect won't fit in a direction.
2205     if (targetRect.width() > unobscuredRectSizeAfterZoom.width())
2206         unobscuredRectLocationAfterZoom.setX(origin.x() - unobscuredRectSizeAfterZoom.width() / 2);
2207     if (targetRect.height() > unobscuredRectSizeAfterZoom.height())
2208         unobscuredRectLocationAfterZoom.setY(origin.y() - unobscuredRectSizeAfterZoom.height() / 2);
2209
2210     // We have computed where we want the unobscured rect to be. Now adjust for the obscuring insets.
2211     WebCore::FloatRect visibleRectAfterZoom(unobscuredRectLocationAfterZoom, unobscuredRectSizeAfterZoom);
2212     visibleRectAfterZoom.move(-topLeftObscuredInsetAfterZoom);
2213     visibleRectAfterZoom.expand(topLeftObscuredInsetAfterZoom + bottomRightObscuredInsetAfterZoom);
2214
2215     [self _zoomToPoint:visibleRectAfterZoom.center() atScale:scale animated:animated];
2216 }
2217
2218 static WebCore::FloatPoint constrainContentOffset(WebCore::FloatPoint contentOffset, WebCore::FloatSize contentSize, WebCore::FloatSize unobscuredContentSize)
2219 {
2220     WebCore::FloatSize maximumContentOffset = contentSize - unobscuredContentSize;
2221     return contentOffset.constrainedBetween(WebCore::FloatPoint(), WebCore::FloatPoint(maximumContentOffset));
2222 }
2223
2224 - (void)_scrollToContentScrollPosition:(WebCore::FloatPoint)scrollPosition scrollOrigin:(WebCore::IntPoint)scrollOrigin
2225 {
2226     if (_commitDidRestoreScrollPosition || _dynamicViewportUpdateMode != WebKit::DynamicViewportUpdateMode::NotResizing)
2227         return;
2228
2229     WebCore::FloatPoint contentOffset = WebCore::ScrollableArea::scrollOffsetFromPosition(scrollPosition, toFloatSize(scrollOrigin));
2230
2231     WebCore::FloatPoint scaledOffset = contentOffset;
2232     CGFloat zoomScale = contentZoomScale(self);
2233     scaledOffset.scale(zoomScale);
2234
2235     CGPoint contentOffsetInScrollViewCoordinates = [self _contentOffsetAdjustedForObscuredInset:scaledOffset];
2236     contentOffsetInScrollViewCoordinates = contentOffsetBoundedInValidRange(_scrollView.get(), contentOffsetInScrollViewCoordinates);
2237
2238     [_scrollView _stopScrollingAndZoomingAnimations];
2239
2240     if (!CGPointEqualToPoint(contentOffsetInScrollViewCoordinates, [_scrollView contentOffset]))
2241         [_scrollView setContentOffset:contentOffsetInScrollViewCoordinates];
2242     else {
2243         // If we haven't changed anything, there would not be any VisibleContentRect update sent to the content.
2244         // The WebProcess would keep the invalid contentOffset as its scroll position.
2245         // To synchronize the WebProcess with what is on screen, we send the VisibleContentRect again.
2246         _page->resendLastVisibleContentRects();
2247     }
2248 }
2249
2250 - (BOOL)_scrollToRect:(WebCore::FloatRect)targetRect origin:(WebCore::FloatPoint)origin minimumScrollDistance:(float)minimumScrollDistance
2251 {
2252     WebCore::FloatRect unobscuredContentRect([self _contentRectForUserInteraction]);
2253     WebCore::FloatPoint unobscuredContentOffset = unobscuredContentRect.location();
2254     WebCore::FloatSize contentSize([self._currentContentView bounds].size);
2255
2256     // Center the target rect in the scroll view.
2257     // If the target doesn't fit in the scroll view, center on the gesture location instead.
2258     WebCore::FloatPoint newUnobscuredContentOffset;
2259     if (targetRect.width() <= unobscuredContentRect.width())
2260         newUnobscuredContentOffset.setX(targetRect.x() - (unobscuredContentRect.width() - targetRect.width()) / 2);
2261     else
2262         newUnobscuredContentOffset.setX(origin.x() - unobscuredContentRect.width() / 2);
2263     if (targetRect.height() <= unobscuredContentRect.height())
2264         newUnobscuredContentOffset.setY(targetRect.y() - (unobscuredContentRect.height() - targetRect.height()) / 2);
2265     else
2266         newUnobscuredContentOffset.setY(origin.y() - unobscuredContentRect.height() / 2);
2267     newUnobscuredContentOffset = constrainContentOffset(newUnobscuredContentOffset, contentSize, unobscuredContentRect.size());
2268
2269     if (unobscuredContentOffset == newUnobscuredContentOffset) {
2270         if (targetRect.width() > unobscuredContentRect.width())
2271             newUnobscuredContentOffset.setX(origin.x() - unobscuredContentRect.width() / 2);
2272         if (targetRect.height() > unobscuredContentRect.height())
2273             newUnobscuredContentOffset.setY(origin.y() - unobscuredContentRect.height() / 2);
2274         newUnobscuredContentOffset = constrainContentOffset(newUnobscuredContentOffset, contentSize, unobscuredContentRect.size());
2275     }
2276
2277     WebCore::FloatSize scrollViewOffsetDelta = newUnobscuredContentOffset - unobscuredContentOffset;
2278     scrollViewOffsetDelta.scale(contentZoomScale(self));
2279
2280     float scrollDistance = scrollViewOffsetDelta.diagonalLength();
2281     if (scrollDistance < minimumScrollDistance)
2282         return false;
2283
2284     [_contentView willStartZoomOrScroll];
2285
2286     LOG_WITH_STREAM(VisibleRects, stream << "_scrollToRect: scrolling to " << [_scrollView contentOffset] + scrollViewOffsetDelta);
2287
2288     [_scrollView setContentOffset:([_scrollView contentOffset] + scrollViewOffsetDelta) animated:YES];
2289     return true;
2290 }
2291
2292 - (void)_zoomOutWithOrigin:(WebCore::FloatPoint)origin animated:(BOOL)animated
2293 {
2294     [self _zoomToPoint:origin atScale:[_scrollView minimumZoomScale] animated:animated];
2295 }
2296
2297 - (void)_zoomToInitialScaleWithOrigin:(WebCore::FloatPoint)origin animated:(BOOL)animated
2298 {
2299     ASSERT(_initialScaleFactor > 0);
2300     [self _zoomToPoint:origin atScale:_initialScaleFactor animated:animated];
2301 }
2302
2303 // focusedElementRect and selectionRect are both in document coordinates.
2304 - (void)_zoomToFocusRect:(const WebCore::FloatRect&)focusedElementRectInDocumentCoordinates selectionRect:(const WebCore::FloatRect&)selectionRectInDocumentCoordinates insideFixed:(BOOL)insideFixed
2305     fontSize:(float)fontSize minimumScale:(double)minimumScale maximumScale:(double)maximumScale allowScaling:(BOOL)allowScaling forceScroll:(BOOL)forceScroll
2306 {
2307     LOG_WITH_STREAM(VisibleRects, stream << "_zoomToFocusRect:" << focusedElementRectInDocumentCoordinates << " selectionRect:" << selectionRectInDocumentCoordinates);
2308     UNUSED_PARAM(insideFixed);
2309
2310     const double minimumHeightToShowContentAboveKeyboard = 106;
2311     const CFTimeInterval formControlZoomAnimationDuration = 0.25;
2312     const double caretOffsetFromWindowEdge = 8;
2313
2314     UIWindow *window = [_scrollView window];
2315
2316     // Find the portion of the view that is visible on the screen.
2317     UIViewController *topViewController = [[[_scrollView _viewControllerForAncestor] _rootAncestorViewController] _viewControllerForSupportedInterfaceOrientations];
2318     UIView *fullScreenView = topViewController.view;
2319     if (!fullScreenView)
2320         fullScreenView = window;
2321
2322     CGRect unobscuredScrollViewRectInWebViewCoordinates = UIEdgeInsetsInsetRect([self bounds], _obscuredInsets);
2323     CGRect visibleScrollViewBoundsInWebViewCoordinates = CGRectIntersection(unobscuredScrollViewRectInWebViewCoordinates, [fullScreenView convertRect:[fullScreenView bounds] toView:self]);
2324     CGRect formAssistantFrameInWebViewCoordinates = [window convertRect:_inputViewBounds toView:self];
2325     CGRect intersectionBetweenScrollViewAndFormAssistant = CGRectIntersection(visibleScrollViewBoundsInWebViewCoordinates, formAssistantFrameInWebViewCoordinates);
2326     CGSize visibleSize = visibleScrollViewBoundsInWebViewCoordinates.size;
2327
2328     CGFloat visibleOffsetFromTop = 0;
2329     if (!CGRectIsEmpty(intersectionBetweenScrollViewAndFormAssistant)) {
2330         CGFloat heightVisibleAboveFormAssistant = CGRectGetMinY(intersectionBetweenScrollViewAndFormAssistant) - CGRectGetMinY(visibleScrollViewBoundsInWebViewCoordinates);
2331         CGFloat heightVisibleBelowFormAssistant = CGRectGetMaxY(visibleScrollViewBoundsInWebViewCoordinates) - CGRectGetMaxY(intersectionBetweenScrollViewAndFormAssistant);
2332
2333         if (heightVisibleAboveFormAssistant >= minimumHeightToShowContentAboveKeyboard || heightVisibleBelowFormAssistant < heightVisibleAboveFormAssistant)
2334             visibleSize.height = heightVisibleAboveFormAssistant;
2335         else {
2336             visibleSize.height = heightVisibleBelowFormAssistant;
2337             visibleOffsetFromTop = CGRectGetMaxY(intersectionBetweenScrollViewAndFormAssistant) - CGRectGetMinY(visibleScrollViewBoundsInWebViewCoordinates);
2338         }
2339     }
2340
2341     // Zoom around the element's bounding frame. We use a "standard" size to determine the proper frame.
2342     double currentScale = contentZoomScale(self);
2343     double scale = currentScale;
2344     if (allowScaling) {
2345 #if PLATFORM(WATCHOS)
2346         const CGFloat minimumMarginForZoomingToEntireFocusRectInWebViewCoordinates = 10;
2347         const CGFloat maximumMarginForZoomingToEntireFocusRectInWebViewCoordinates = 35;
2348
2349         CGRect minimumTargetRectInDocumentCoordinates = UIRectInsetEdges(focusedElementRectInDocumentCoordinates, UIRectEdgeAll, -minimumMarginForZoomingToEntireFocusRectInWebViewCoordinates / currentScale);
2350         CGRect maximumTargetRectInDocumentCoordinates = UIRectInsetEdges(focusedElementRectInDocumentCoordinates, UIRectEdgeAll, -maximumMarginForZoomingToEntireFocusRectInWebViewCoordinates / currentScale);
2351
2352         double clampedMaximumTargetScale = clampTo<double>(std::min(visibleSize.width / CGRectGetWidth(minimumTargetRectInDocumentCoordinates), visibleSize.height / CGRectGetHeight(minimumTargetRectInDocumentCoordinates)), minimumScale, maximumScale);
2353         double clampedMinimumTargetScale = clampTo<double>(std::min(visibleSize.width / CGRectGetWidth(maximumTargetRectInDocumentCoordinates), visibleSize.height / CGRectGetHeight(maximumTargetRectInDocumentCoordinates)), minimumScale, maximumScale);
2354         scale = clampTo<double>(currentScale, clampedMinimumTargetScale, clampedMaximumTargetScale);
2355 #else
2356         const double webViewStandardFontSize = 16;
2357         scale = clampTo<double>(webViewStandardFontSize / fontSize, minimumScale, maximumScale);
2358 #endif
2359     }
2360
2361     CGFloat documentWidth = [_contentView bounds].size.width;
2362     scale = CGRound(documentWidth * scale) / documentWidth;
2363
2364     WebCore::FloatRect focusedElementRectInNewScale = focusedElementRectInDocumentCoordinates;
2365     focusedElementRectInNewScale.scale(scale);
2366     focusedElementRectInNewScale.moveBy([_contentView frame].origin);
2367
2368     BOOL selectionRectIsNotNull = !selectionRectInDocumentCoordinates.isZero();
2369     if (!forceScroll) {
2370         CGRect currentlyVisibleRegionInWebViewCoordinates;
2371         currentlyVisibleRegionInWebViewCoordinates.origin = unobscuredScrollViewRectInWebViewCoordinates.origin;
2372         currentlyVisibleRegionInWebViewCoordinates.origin.y += visibleOffsetFromTop;
2373         currentlyVisibleRegionInWebViewCoordinates.size = visibleSize;
2374
2375         // Don't bother scrolling if the entire node is already visible, whether or not we got a selectionRect.
2376         if (CGRectContainsRect(currentlyVisibleRegionInWebViewCoordinates, [self convertRect:focusedElementRectInDocumentCoordinates fromView:_contentView.get()]))
2377             return;
2378
2379         // Don't bother scrolling if we have a valid selectionRect and it is already visible.
2380         if (selectionRectIsNotNull && CGRectContainsRect(currentlyVisibleRegionInWebViewCoordinates, [self convertRect:selectionRectInDocumentCoordinates fromView:_contentView.get()]))
2381             return;
2382     }
2383
2384     // We want to center the focused element within the viewport, with as much spacing on all sides as
2385     // we can get based on the visible area after zooming. The spacing in either dimension is half the
2386     // difference between the size of the DOM node and the size of the visible frame.
2387     // If the element is too wide to be horizontally centered or too tall to be vertically centered, we
2388     // instead scroll such that the left edge or top edge of the element is within the left half or top
2389     // half of the viewport, respectively.
2390     CGFloat horizontalSpaceInWebViewCoordinates = (visibleSize.width - focusedElementRectInNewScale.width()) / 2.0;
2391     CGFloat verticalSpaceInWebViewCoordinates = (visibleSize.height - focusedElementRectInNewScale.height()) / 2.0;
2392
2393     auto topLeft = CGPointZero;
2394     auto scrollViewInsets = [_scrollView _effectiveContentInset];
2395     auto currentTopLeft = [_scrollView contentOffset];
2396
2397     if (_haveSetObscuredInsets) {
2398         currentTopLeft.x += _obscuredInsets.left;
2399         currentTopLeft.y += _obscuredInsets.top;
2400     }
2401
2402     if (horizontalSpaceInWebViewCoordinates > 0)
2403         topLeft.x = focusedElementRectInNewScale.x() - horizontalSpaceInWebViewCoordinates;
2404     else {
2405         auto minimumOffsetToRevealLeftEdge = std::max(-scrollViewInsets.left, focusedElementRectInNewScale.x() - visibleSize.width / 2);
2406         auto maximumOffsetToRevealLeftEdge = focusedElementRectInNewScale.x();
2407         topLeft.x = clampTo<double>(currentTopLeft.x, minimumOffsetToRevealLeftEdge, maximumOffsetToRevealLeftEdge);
2408     }
2409
2410     if (verticalSpaceInWebViewCoordinates > 0)
2411         topLeft.y = focusedElementRectInNewScale.y() - verticalSpaceInWebViewCoordinates;
2412     else {
2413         auto minimumOffsetToRevealTopEdge = std::max(-scrollViewInsets.top, focusedElementRectInNewScale.y() - visibleSize.height / 2);
2414         auto maximumOffsetToRevealTopEdge = focusedElementRectInNewScale.y();
2415         topLeft.y = clampTo<double>(currentTopLeft.y, minimumOffsetToRevealTopEdge, maximumOffsetToRevealTopEdge);
2416     }
2417
2418     topLeft.y -= visibleOffsetFromTop;
2419
2420     WebCore::FloatRect documentBoundsInNewScale = [_contentView bounds];
2421     documentBoundsInNewScale.scale(scale);
2422     documentBoundsInNewScale.moveBy([_contentView frame].origin);
2423
2424     CGFloat minimumAllowableHorizontalOffsetInWebViewCoordinates = -INFINITY;
2425     CGFloat minimumAllowableVerticalOffsetInWebViewCoordinates = -INFINITY;
2426     CGFloat maximumAllowableHorizontalOffsetInWebViewCoordinates = CGRectGetMaxX(documentBoundsInNewScale) - visibleSize.width;
2427     CGFloat maximumAllowableVerticalOffsetInWebViewCoordinates = CGRectGetMaxY(documentBoundsInNewScale) - visibleSize.height;
2428
2429     if (selectionRectIsNotNull) {
2430         WebCore::FloatRect selectionRectInNewScale = selectionRectInDocumentCoordinates;
2431         selectionRectInNewScale.scale(scale);
2432         selectionRectInNewScale.moveBy([_contentView frame].origin);
2433         // Adjust the min and max allowable scroll offsets, such that the selection rect remains visible.
2434         minimumAllowableHorizontalOffsetInWebViewCoordinates = CGRectGetMaxX(selectionRectInNewScale) + caretOffsetFromWindowEdge - visibleSize.width;
2435         minimumAllowableVerticalOffsetInWebViewCoordinates = CGRectGetMaxY(selectionRectInNewScale) + caretOffsetFromWindowEdge - visibleSize.height - visibleOffsetFromTop;
2436         maximumAllowableHorizontalOffsetInWebViewCoordinates = std::min<CGFloat>(maximumAllowableHorizontalOffsetInWebViewCoordinates, CGRectGetMinX(selectionRectInNewScale) - caretOffsetFromWindowEdge);
2437         maximumAllowableVerticalOffsetInWebViewCoordinates = std::min<CGFloat>(maximumAllowableVerticalOffsetInWebViewCoordinates, CGRectGetMinY(selectionRectInNewScale) - caretOffsetFromWindowEdge - visibleOffsetFromTop);
2438     }
2439
2440     // Constrain the left edge in document coordinates so that:
2441     //  - it isn't so small that the scrollVisibleRect isn't visible on the screen
2442     //  - it isn't so great that the document's right edge is less than the right edge of the screen
2443     topLeft.x = clampTo<CGFloat>(topLeft.x, minimumAllowableHorizontalOffsetInWebViewCoordinates, maximumAllowableHorizontalOffsetInWebViewCoordinates);
2444
2445     // Constrain the top edge in document coordinates so that:
2446     //  - it isn't so small that the scrollVisibleRect isn't visible on the screen
2447     //  - it isn't so great that the document's bottom edge is higher than the top of the form assistant
2448     topLeft.y = clampTo<CGFloat>(topLeft.y, minimumAllowableVerticalOffsetInWebViewCoordinates, maximumAllowableVerticalOffsetInWebViewCoordinates);
2449
2450     if (_haveSetObscuredInsets) {
2451         // This looks unintuitive, but is necessary in order to precisely center the focused element in the visible area.
2452         // The top left position already accounts for top and left obscured insets - i.e., a topLeft of (0, 0) corresponds
2453         // to the top- and left-most point below (and to the right of) the top inset area and left inset areas, respectively.
2454         // However, when telling WKScrollView to scroll to a given center position, this center position is computed relative
2455         // to the coordinate space of the scroll view. Thus, to compute our center position from the top left position, we
2456         // need to first move the top left position up and to the left, and then add half the width and height of the content
2457         // area (including obscured insets).
2458         topLeft.x -= _obscuredInsets.left;
2459         topLeft.y -= _obscuredInsets.top;
2460     }
2461
2462     WebCore::FloatPoint newCenter = CGPointMake(topLeft.x + CGRectGetWidth(self.bounds) / 2, topLeft.y + CGRectGetHeight(self.bounds) / 2);
2463
2464     if (scale != currentScale)
2465         _page->willStartUserTriggeredZooming();
2466
2467     LOG_WITH_STREAM(VisibleRects, stream << "_zoomToFocusRect: zooming to " << newCenter << " scale:" << scale);
2468
2469     // The newCenter has been computed in the new scale, but _zoomToCenter expected the center to be in the original scale.
2470     newCenter.scale(1 / scale);
2471     [_scrollView _zoomToCenter:newCenter scale:scale duration:formControlZoomAnimationDuration force:YES];
2472 }
2473
2474 - (double)_initialScaleFactor
2475 {
2476     return _initialScaleFactor;
2477 }
2478
2479 - (double)_contentZoomScale
2480 {
2481     return contentZoomScale(self);
2482 }
2483
2484 - (double)_targetContentZoomScaleForRect:(const WebCore::FloatRect&)targetRect currentScale:(double)currentScale fitEntireRect:(BOOL)fitEntireRect minimumScale:(double)minimumScale maximumScale:(double)maximumScale
2485 {
2486     WebCore::FloatSize unobscuredContentSize([self _contentRectForUserInteraction].size);
2487     double horizontalScale = unobscuredContentSize.width() * currentScale / targetRect.width();
2488     double verticalScale = unobscuredContentSize.height() * currentScale / targetRect.height();
2489
2490     horizontalScale = std::min(std::max(horizontalScale, minimumScale), maximumScale);
2491     verticalScale = std::min(std::max(verticalScale, minimumScale), maximumScale);
2492
2493     return fitEntireRect ? std::min(horizontalScale, verticalScale) : horizontalScale;
2494 }
2495
2496 - (BOOL)_zoomToRect:(WebCore::FloatRect)targetRect withOrigin:(WebCore::FloatPoint)origin fitEntireRect:(BOOL)fitEntireRect minimumScale:(double)minimumScale maximumScale:(double)maximumScale minimumScrollDistance:(float)minimumScrollDistance
2497 {
2498     const float maximumScaleFactorDeltaForPanScroll = 0.02;
2499
2500     double currentScale = contentZoomScale(self);
2501     double targetScale = [self _targetContentZoomScaleForRect:targetRect currentScale:currentScale fitEntireRect:fitEntireRect minimumScale:minimumScale maximumScale:maximumScale];
2502
2503     if (fabs(targetScale - currentScale) < maximumScaleFactorDeltaForPanScroll) {
2504         if ([self _scrollToRect:targetRect origin:origin minimumScrollDistance:minimumScrollDistance])
2505             return true;
2506     } else if (targetScale != currentScale) {
2507         [self _zoomToRect:targetRect atScale:targetScale origin:origin animated:YES];
2508         return true;
2509     }
2510
2511     return false;
2512 }
2513
2514 - (void)didMoveToWindow
2515 {
2516     _page->activityStateDidChange(WebCore::ActivityState::allFlags());
2517     _page->webViewDidMoveToWindow();
2518 }
2519
2520 - (void)setOpaque:(BOOL)opaque
2521 {
2522     BOOL oldOpaque = self.opaque;
2523
2524     [super setOpaque:opaque];
2525     [_contentView setOpaque:opaque];
2526
2527     if (oldOpaque == opaque)
2528         return;
2529
2530     if (!_page)
2531         return;
2532
2533     Optional<WebCore::Color> backgroundColor;
2534     if (!opaque)
2535         backgroundColor = WebCore::Color(WebCore::Color::transparent);
2536     _page->setBackgroundColor(backgroundColor);
2537     [self _updateScrollViewBackground];
2538 }
2539
2540 - (void)setBackgroundColor:(UIColor *)backgroundColor
2541 {
2542     [super setBackgroundColor:backgroundColor];
2543     [_contentView setBackgroundColor:backgroundColor];
2544     [self _updateScrollViewBackground];
2545 }
2546
2547 - (BOOL)_allowsDoubleTapGestures
2548 {
2549     if (_fastClickingIsDisabled)
2550         return YES;
2551
2552     // If the page is not user scalable, we don't allow double tap gestures.
2553     if (![_scrollView isZoomEnabled] || [_scrollView minimumZoomScale] >= [_scrollView maximumZoomScale])
2554         return NO;
2555
2556     // If the viewport width was not explicit, we allow double tap gestures.
2557     if (!_viewportMetaTagWidthWasExplicit || _viewportMetaTagCameFromImageDocument)
2558         return YES;
2559
2560     // If the page set a viewport width that wasn't the device width, then it was
2561     // scaled and thus will probably need to zoom.
2562     if (_viewportMetaTagWidth != WebCore::ViewportArguments::ValueDeviceWidth)
2563         return YES;
2564
2565     // At this point, we have a page that asked for width = device-width. However,
2566     // if the content's width and height were large, we might have had to shrink it.
2567     // We'll enable double tap zoom whenever we're not at the actual initial scale.
2568     return !areEssentiallyEqualAsFloat(contentZoomScale(self), _initialScaleFactor);
2569 }
2570
2571 - (BOOL)_stylusTapGestureShouldCreateEditableImage
2572 {
2573     return [_configuration _editableImagesEnabled];
2574 }
2575
2576 #pragma mark - UIScrollViewDelegate
2577
2578 - (BOOL)usesStandardContentView
2579 {
2580     return !_customContentView && !_passwordView;
2581 }
2582
2583 - (CGSize)scrollView:(UIScrollView*)scrollView contentSizeForZoomScale:(CGFloat)scale withProposedSize:(CGSize)proposedSize
2584 {
2585     return roundScrollViewContentSize(*_page, proposedSize);
2586 }
2587
2588 - (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
2589 {
2590     ASSERT(_scrollView == scrollView);
2591     return self._currentContentView;
2592 }
2593
2594 - (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view
2595 {
2596     if (![self usesStandardContentView]) {
2597         if ([_customContentView respondsToSelector:@selector(web_scrollViewWillBeginZooming:withView:)])
2598             [_customContentView web_scrollViewWillBeginZooming:scrollView withView:view];
2599         return;
2600     }
2601
2602     if (scrollView.pinchGestureRecognizer.state == UIGestureRecognizerStateBegan) {
2603         _page->willStartUserTriggeredZooming();
2604         [_contentView scrollViewWillStartPanOrPinchGesture];
2605     }
2606     [_contentView willStartZoomOrScroll];
2607
2608 #if ENABLE(POINTER_EVENTS)
2609     [_contentView cancelPointersForGestureRecognizer:scrollView.pinchGestureRecognizer];
2610 #endif
2611 }
2612
2613 - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
2614 {
2615     if (![self usesStandardContentView])
2616         return;
2617
2618     if (scrollView.panGestureRecognizer.state == UIGestureRecognizerStateBegan)
2619         [_contentView scrollViewWillStartPanOrPinchGesture];
2620
2621     [_contentView willStartZoomOrScroll];
2622 #if ENABLE(CSS_SCROLL_SNAP) && ENABLE(ASYNC_SCROLLING)
2623     // FIXME: We will want to detect whether snapping will occur before beginning to drag. See WebPageProxy::didCommitLayerTree.
2624     WebKit::RemoteScrollingCoordinatorProxy* coordinator = _page->scrollingCoordinatorProxy();
2625     ASSERT(scrollView == _scrollView.get());
2626     CGFloat scrollDecelerationFactor = (coordinator && coordinator->shouldSetScrollViewDecelerationRateFast()) ? UIScrollViewDecelerationRateFast : UIScrollViewDecelerationRateNormal;
2627     scrollView.horizontalScrollDecelerationFactor = scrollDecelerationFactor;
2628     scrollView.verticalScrollDecelerationFactor = scrollDecelerationFactor;
2629 #endif
2630 }
2631
2632 - (void)_didFinishScrolling
2633 {
2634     if (![self usesStandardContentView])
2635         return;
2636
2637     [self _scheduleVisibleContentRectUpdate];
2638     [_contentView didFinishScrolling];
2639 }
2640
2641 - (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset
2642 {
2643     // Work around <rdar://problem/16374753> by avoiding deceleration while
2644     // zooming. We'll animate to the right place once the zoom finishes.
2645     if ([scrollView isZooming])
2646         *targetContentOffset = [scrollView contentOffset];
2647 #if ENABLE(POINTER_EVENTS)
2648     else {
2649         if ([_contentView preventsPanningInXAxis])
2650             targetContentOffset->x = scrollView.contentOffset.x;
2651         if ([_contentView preventsPanningInYAxis])
2652             targetContentOffset->y = scrollView.contentOffset.y;
2653     }
2654 #endif
2655 #if ENABLE(CSS_SCROLL_SNAP) && ENABLE(ASYNC_SCROLLING)
2656     if (WebKit::RemoteScrollingCoordinatorProxy* coordinator = _page->scrollingCoordinatorProxy()) {
2657         // FIXME: Here, I'm finding the maximum horizontal/vertical scroll offsets. There's probably a better way to do this.
2658         CGSize maxScrollOffsets = CGSizeMake(scrollView.contentSize.width - scrollView.bounds.size.width, scrollView.contentSize.height - scrollView.bounds.size.height);
2659
2660         UIEdgeInsets obscuredInset;
2661
2662         id<WKUIDelegatePrivate> uiDelegatePrivate = static_cast<id <WKUIDelegatePrivate>>([self UIDelegate]);
2663         if ([uiDelegatePrivate respondsToSelector:@selector(_webView:finalObscuredInsetsForScrollView:withVelocity:targetContentOffset:)])
2664             obscuredInset = [uiDelegatePrivate _webView:self finalObscuredInsetsForScrollView:scrollView withVelocity:velocity targetContentOffset:targetContentOffset];
2665         else
2666             obscuredInset = [self _computedObscuredInset];
2667
2668         CGRect unobscuredRect = UIEdgeInsetsInsetRect(self.bounds, obscuredInset);
2669
2670         coordinator->adjustTargetContentOffsetForSnapping(maxScrollOffsets, velocity, unobscuredRect.origin.y, targetContentOffset);
2671     }
2672 #endif
2673 }
2674
2675 - (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
2676 {
2677     // If we're decelerating, scroll offset will be updated when scrollViewDidFinishDecelerating: is called.
2678     if (!decelerate)
2679         [self _didFinishScrolling];
2680 }
2681
2682 - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
2683 {
2684     [self _didFinishScrolling];
2685 }
2686
2687 - (void)scrollViewDidScrollToTop:(UIScrollView *)scrollView
2688 {
2689     [self _didFinishScrolling];
2690 }
2691
2692 #if ENABLE(POINTER_EVENTS)
2693 - (CGPoint)_scrollView:(UIScrollView *)scrollView adjustedOffsetForOffset:(CGPoint)offset translation:(CGPoint)translation startPoint:(CGPoint)start locationInView:(CGPoint)locationInView horizontalVelocity:(inout double *)hv verticalVelocity:(inout double *)vv
2694 {
2695     if (![_contentView preventsPanningInXAxis] && ![_contentView preventsPanningInYAxis]) {
2696         [_contentView cancelPointersForGestureRecognizer:scrollView.panGestureRecognizer];
2697         return offset;
2698     }
2699
2700     CGPoint adjustedContentOffset = CGPointMake(offset.x, offset.y);
2701     if ([_contentView preventsPanningInXAxis])
2702         adjustedContentOffset.x = start.x;
2703     if ([_contentView preventsPanningInYAxis])
2704         adjustedContentOffset.y = start.y;
2705
2706     if ((![_contentView preventsPanningInXAxis] && adjustedContentOffset.x != start.x)
2707         || (![_contentView preventsPanningInYAxis] && adjustedContentOffset.y != start.y)) {
2708         [_contentView cancelPointersForGestureRecognizer:scrollView.panGestureRecognizer];
2709     }
2710
2711     return adjustedContentOffset;
2712 }
2713 #endif
2714
2715 - (void)scrollViewDidScroll:(UIScrollView *)scrollView
2716 {
2717     if (![self usesStandardContentView] && [_customContentView respondsToSelector:@selector(web_scrollViewDidScroll:)])
2718         [_customContentView web_scrollViewDidScroll:(UIScrollView *)scrollView];
2719
2720     [self _scheduleVisibleContentRectUpdateAfterScrollInView:scrollView];
2721
2722     if (WebKit::RemoteLayerTreeScrollingPerformanceData* scrollPerfData = _page->scrollingPerformanceData())
2723         scrollPerfData->didScroll([self visibleRectInViewCoordinates]);
2724 }
2725
2726 - (void)scrollViewDidZoom:(UIScrollView *)scrollView
2727 {
2728     if (![self usesStandardContentView] && [_customContentView respondsToSelector:@selector(web_scrollViewDidZoom:)])
2729         [_customContentView web_scrollViewDidZoom:scrollView];
2730
2731     [self _updateScrollViewBackground];
2732     [self _scheduleVisibleContentRectUpdateAfterScrollInView:scrollView];
2733 }
2734
2735 - (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale
2736 {
2737     if (![self usesStandardContentView] && [_customContentView respondsToSelector:@selector(web_scrollViewDidEndZooming:withView:atScale:)])
2738         [_customContentView web_scrollViewDidEndZooming:scrollView withView:view atScale:scale];
2739
2740     ASSERT(scrollView == _scrollView);
2741     // FIXME: remove when rdar://problem/36065495 is fixed.
2742     // When rotating with two fingers down, UIScrollView can set a bogus content view position.
2743     // "Center" is top left because we set the anchorPoint to 0,0.
2744     [_contentView setCenter:self.bounds.origin];
2745
2746     [self _scheduleVisibleContentRectUpdateAfterScrollInView:scrollView];
2747     [_contentView didZoomToScale:scale];
2748 }
2749
2750 - (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView
2751 {
2752     [self _didFinishScrolling];
2753 }
2754
2755 - (void)_scrollViewDidInterruptDecelerating:(UIScrollView *)scrollView
2756 {
2757     if (![self usesStandardContentView])
2758         return;
2759
2760     [_contentView didInterruptScrolling];
2761     [self _scheduleVisibleContentRectUpdateAfterScrollInView:scrollView];
2762 }
2763
2764 - (UIView *)_enclosingViewForExposedRectComputation
2765 {
2766     return [self _scroller];
2767 }
2768
2769 - (CGRect)_visibleRectInEnclosingView:(UIView *)enclosingView
2770 {
2771     if (!enclosingView)
2772         return self.bounds;
2773
2774     CGRect exposedRect = [enclosingView convertRect:enclosingView.bounds toView:self];
2775     return CGRectIntersectsRect(exposedRect, self.bounds) ? CGRectIntersection(exposedRect, self.bounds) : CGRectZero;
2776 }
2777
2778 - (CGRect)_visibleContentRect
2779 {
2780     if (_frozenVisibleContentRect)
2781         return _frozenVisibleContentRect.value();
2782
2783     CGRect visibleRectInContentCoordinates = [self convertRect:self.bounds toView:_contentView.get()];
2784
2785     if (UIView *enclosingView = [self _enclosingViewForExposedRectComputation]) {
2786         CGRect viewVisibleRect = [self _visibleRectInEnclosingView:enclosingView];
2787         CGRect viewVisibleContentRect = [self convertRect:viewVisibleRect toView:_contentView.get()];
2788         visibleRectInContentCoordinates = CGRectIntersection(visibleRectInContentCoordinates, viewVisibleContentRect);
2789     }
2790
2791     return visibleRectInContentCoordinates;
2792 }
2793
2794 // Called when some ancestor UIScrollView scrolls.
2795 - (void)_didScroll
2796 {
2797     [self _scheduleVisibleContentRectUpdateAfterScrollInView:[self _scroller]];
2798
2799     const NSTimeInterval ScrollingEndedTimerInterval = 0.032;
2800     if (!_enclosingScrollViewScrollTimer) {
2801         _enclosingScrollViewScrollTimer = adoptNS([[NSTimer alloc] initWithFireDate:[NSDate dateWithTimeIntervalSinceNow:ScrollingEndedTimerInterval]
2802             interval:0 target:self selector:@selector(_enclosingScrollerScrollingEnded:) userInfo:nil repeats:YES]);
2803         [[NSRunLoop mainRunLoop] addTimer:_enclosingScrollViewScrollTimer.get() forMode:NSDefaultRunLoopMode];
2804     }
2805     _didScrollSinceLastTimerFire = YES;
2806 }
2807
2808 - (void)_enclosingScrollerScrollingEnded:(NSTimer *)timer
2809 {
2810     if (_didScrollSinceLastTimerFire) {
2811         _didScrollSinceLastTimerFire = NO;
2812         return;
2813     }
2814
2815     [self _scheduleVisibleContentRectUpdate];
2816     [_enclosingScrollViewScrollTimer invalidate];
2817     _enclosingScrollViewScrollTimer = nil;
2818 }
2819
2820 - (UIEdgeInsets)_scrollViewSystemContentInset
2821 {
2822     // It's not safe to access the scroll view's safeAreaInsets or _systemContentInset from
2823     // inside our layoutSubviews implementation, because they aren't updated until afterwards.
2824     // Instead, depend on the fact that the UIScrollView and WKWebView are in the same coordinate
2825     // space, and map the WKWebView's own insets into the scroll view manually.
2826     return UIEdgeInsetsAdd([_scrollView _contentScrollInset], self.safeAreaInsets, [_scrollView _edgesApplyingSafeAreaInsetsToContentInset]);
2827 }
2828
2829 - (WebCore::FloatSize)activeViewLayoutSize:(const CGRect&)bounds
2830 {
2831     if (_overridesViewLayoutSize)
2832         return WebCore::FloatSize(_viewLayoutSizeOverride);
2833
2834 #if __IPHONE_OS_VERSION_MIN_REQUIRED >= 110000
2835     return WebCore::FloatSize(UIEdgeInsetsInsetRect(CGRectMake(0, 0, bounds.size.width, bounds.size.height), self._scrollViewSystemContentInset).size);
2836 #else
2837     return WebCore::FloatSize { bounds.size };
2838 #endif
2839 }
2840
2841 - (void)_dispatchSetViewLayoutSize:(WebCore::FloatSize)viewLayoutSize
2842 {
2843     if (_lastSentViewLayoutSize && CGSizeEqualToSize(_lastSentViewLayoutSize.value(), viewLayoutSize))
2844         return;
2845
2846     LOG_WITH_STREAM(VisibleRects, stream << "-[WKWebView " << _page->pageID() << " _dispatchSetViewLayoutSize:] " << viewLayoutSize << " contentZoomScale " << contentZoomScale(self));
2847     _page->setViewportConfigurationViewLayoutSize(viewLayoutSize, _page->layoutSizeScaleFactor(), _page->minimumEffectiveDeviceWidth());
2848     _lastSentViewLayoutSize = viewLayoutSize;
2849 }
2850
2851 - (void)_dispatchSetMaximumUnobscuredSize:(WebCore::FloatSize)maximumUnobscuredSize
2852 {
2853     if (_lastSentMaximumUnobscuredSize && CGSizeEqualToSize(_lastSentMaximumUnobscuredSize.value(), maximumUnobscuredSize))
2854         return;
2855
2856     _page->setMaximumUnobscuredSize(maximumUnobscuredSize);
2857     _lastSentMaximumUnobscuredSize = maximumUnobscuredSize;
2858 }
2859
2860 - (void)_dispatchSetDeviceOrientation:(int32_t)deviceOrientation
2861 {
2862     if (_lastSentDeviceOrientation && _lastSentDeviceOrientation.value() == deviceOrientation)
2863         return;
2864
2865     _page->setDeviceOrientation(deviceOrientation);
2866     _lastSentDeviceOrientation = deviceOrientation;
2867 }
2868
2869 - (void)_frameOrBoundsChanged
2870 {
2871     CGRect bounds = self.bounds;
2872     [_scrollView setFrame:bounds];
2873
2874     if (_dynamicViewportUpdateMode == WebKit::DynamicViewportUpdateMode::NotResizing) {
2875         if (!_overridesViewLayoutSize)
2876             [self _dispatchSetViewLayoutSize:[self activeViewLayoutSize:self.bounds]];
2877         if (!_overridesMaximumUnobscuredSize)
2878             [self _dispatchSetMaximumUnobscuredSize:WebCore::FloatSize(bounds.size)];
2879
2880         BOOL sizeChanged = NO;
2881         if (auto drawingArea = _page->drawingArea())
2882             sizeChanged = drawingArea->setSize(WebCore::IntSize(bounds.size));
2883
2884         if (sizeChanged & [self usesStandardContentView])
2885             [_contentView setSizeChangedSinceLastVisibleContentRectUpdate:YES];
2886     }
2887
2888     [_customContentView web_setMinimumSize:bounds.size];
2889     [self _scheduleVisibleContentRectUpdate];
2890 }
2891
2892 // 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.
2893 - (CGRect)_contentRectForUserInteraction
2894 {
2895     // FIXME: handle split keyboard.
2896     UIEdgeInsets obscuredInsets = _obscuredInsets;
2897     obscuredInsets.bottom = std::max(_obscuredInsets.bottom, _inputViewBounds.size.height);
2898     CGRect unobscuredRect = UIEdgeInsetsInsetRect(self.bounds, obscuredInsets);
2899     return [self convertRect:unobscuredRect toView:self._currentContentView];
2900 }
2901
2902 // Ideally UIScrollView would expose this for us: <rdar://problem/21394567>.
2903 - (BOOL)_scrollViewIsRubberBanding
2904 {
2905     float deviceScaleFactor = _page->deviceScaleFactor();
2906
2907     CGPoint contentOffset = [_scrollView contentOffset];
2908     CGPoint boundedOffset = contentOffsetBoundedInValidRange(_scrollView.get(), contentOffset);
2909     return !pointsEqualInDevicePixels(contentOffset, boundedOffset, deviceScaleFactor);
2910 }
2911
2912 #if __IPHONE_OS_VERSION_MIN_REQUIRED >= 110000
2913 - (void)safeAreaInsetsDidChange
2914 {
2915     [super safeAreaInsetsDidChange];
2916
2917     [self _scheduleVisibleContentRectUpdate];
2918 }
2919 #endif
2920
2921 - (void)_scheduleVisibleContentRectUpdate
2922 {
2923     // For visible rect updates not associated with a specific UIScrollView, just consider our own scroller.
2924     [self _scheduleVisibleContentRectUpdateAfterScrollInView:_scrollView.get()];
2925 }
2926
2927 - (BOOL)_scrollViewIsInStableState:(UIScrollView *)scrollView
2928 {
2929     BOOL isStableState = !([scrollView isDragging] || [scrollView isDecelerating] || [scrollView isZooming] || [scrollView _isAnimatingZoom] || [scrollView _isScrollingToTop]);
2930
2931     if (isStableState && scrollView == _scrollView.get())
2932         isStableState = !_isChangingObscuredInsetsInteractively;
2933
2934     if (isStableState && scrollView == _scrollView.get())
2935         isStableState = ![self _scrollViewIsRubberBanding];
2936
2937     if (isStableState)
2938         isStableState = !scrollView._isInterruptingDeceleration;
2939
2940     if (NSNumber *stableOverride = self._stableStateOverride)
2941         isStableState = stableOverride.boolValue;
2942
2943     return isStableState;
2944 }
2945
2946 - (void)_addUpdateVisibleContentRectPreCommitHandler
2947 {
2948     auto retainedSelf = retainPtr(self);
2949     [CATransaction addCommitHandler:[retainedSelf] {
2950         WKWebView *webView = retainedSelf.get();
2951         if (![webView _isValid]) {
2952             RELEASE_LOG_IF(webView._page && webView._page->isAlwaysOnLoggingAllowed(), ViewState, "In CATransaction preCommitHandler, WKWebView %p is invalid", webView);
2953             return;
2954         }
2955
2956         @try {
2957             [webView _updateVisibleContentRects];
2958         } @catch (NSException *exception) {
2959             RELEASE_LOG_IF(webView._page && webView._page->isAlwaysOnLoggingAllowed(), ViewState, "In CATransaction preCommitHandler, -[WKWebView %p _updateVisibleContentRects] threw an exception", webView);
2960         }
2961         webView->_hasScheduledVisibleRectUpdate = NO;
2962     } forPhase:kCATransactionPhasePreCommit];
2963 }
2964
2965 - (void)_scheduleVisibleContentRectUpdateAfterScrollInView:(UIScrollView *)scrollView
2966 {
2967     _visibleContentRectUpdateScheduledFromScrollViewInStableState = [self _scrollViewIsInStableState:scrollView];
2968
2969     if (_hasScheduledVisibleRectUpdate) {
2970         auto timeNow = MonotonicTime::now();
2971         if ((timeNow - _timeOfRequestForVisibleContentRectUpdate) > delayBeforeNoVisibleContentsRectsLogging) {
2972             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",
2973                 self, (timeNow - _timeOfRequestForVisibleContentRectUpdate).value(), (timeNow - _timeOfLastVisibleContentRectUpdate).value(), [self _isValid]);
2974         }
2975         return;
2976     }
2977
2978     _hasScheduledVisibleRectUpdate = YES;
2979     _timeOfRequestForVisibleContentRectUpdate = MonotonicTime::now();
2980
2981     CATransactionPhase transactionPhase = [CATransaction currentPhase];
2982     if (transactionPhase == kCATransactionPhaseNull || transactionPhase == kCATransactionPhasePreLayout) {
2983         [self _addUpdateVisibleContentRectPreCommitHandler];
2984         return;
2985     }
2986
2987     dispatch_async(dispatch_get_main_queue(), [retainedSelf = retainPtr(self)] {
2988         WKWebView *webView = retainedSelf.get();
2989         if (![webView _isValid])
2990             return;
2991         [webView _addUpdateVisibleContentRectPreCommitHandler];
2992     });
2993 }
2994
2995 static bool scrollViewCanScroll(UIScrollView *scrollView)
2996 {
2997     if (!scrollView)
2998         return NO;
2999
3000     UIEdgeInsets contentInset = scrollView.contentInset;
3001     CGSize contentSize = scrollView.contentSize;
3002     CGSize boundsSize = scrollView.bounds.size;
3003
3004     return (contentSize.width + contentInset.left + contentInset.right) > boundsSize.width
3005         || (contentSize.height + contentInset.top + contentInset.bottom) > boundsSize.height;
3006 }
3007
3008 - (CGRect)_contentBoundsExtendedForRubberbandingWithScale:(CGFloat)scaleFactor
3009 {
3010     CGPoint contentOffset = [_scrollView contentOffset];
3011     CGPoint boundedOffset = contentOffsetBoundedInValidRange(_scrollView.get(), contentOffset);
3012
3013     CGFloat horiontalRubberbandAmountInContentCoordinates = (contentOffset.x - boundedOffset.x) / scaleFactor;
3014     CGFloat verticalRubberbandAmountInContentCoordinates = (contentOffset.y - boundedOffset.y) / scaleFactor;
3015
3016     CGRect extendedBounds = [_contentView bounds];
3017
3018     if (horiontalRubberbandAmountInContentCoordinates < 0) {
3019         extendedBounds.origin.x += horiontalRubberbandAmountInContentCoordinates;
3020         extendedBounds.size.width -= horiontalRubberbandAmountInContentCoordinates;
3021     } else if (horiontalRubberbandAmountInContentCoordinates > 0)
3022         extendedBounds.size.width += horiontalRubberbandAmountInContentCoordinates;
3023
3024     if (verticalRubberbandAmountInContentCoordinates < 0) {
3025         extendedBounds.origin.y += verticalRubberbandAmountInContentCoordinates;
3026         extendedBounds.size.height -= verticalRubberbandAmountInContentCoordinates;
3027     } else if (verticalRubberbandAmountInContentCoordinates > 0)
3028         extendedBounds.size.height += verticalRubberbandAmountInContentCoordinates;
3029
3030     return extendedBounds;
3031 }
3032
3033 - (void)_updateVisibleContentRects
3034 {
3035     BOOL inStableState = _visibleContentRectUpdateScheduledFromScrollViewInStableState;
3036
3037     if (![self usesStandardContentView]) {
3038         [_passwordView setFrame:self.bounds];
3039         [_customContentView web_computedContentInsetDidChange];
3040         RELEASE_LOG_IF_ALLOWED("%p -[WKWebView _updateVisibleContentRects:] - usesStandardContentView is NO, bailing", self);
3041         return;
3042     }
3043
3044     if (_delayUpdateVisibleContentRects) {
3045         _hadDelayedUpdateVisibleContentRects = YES;
3046         RELEASE_LOG_IF_ALLOWED("%p -[WKWebView _updateVisibleContentRects:] - _delayUpdateVisibleContentRects is YES, bailing", self);
3047         return;
3048     }
3049
3050     if (_dynamicViewportUpdateMode != WebKit::DynamicViewportUpdateMode::NotResizing
3051         || (_needsResetViewStateAfterCommitLoadForMainFrame && ![_contentView sizeChangedSinceLastVisibleContentRectUpdate])
3052         || [_scrollView isZoomBouncing]
3053         || _currentlyAdjustingScrollViewInsetsForKeyboard) {
3054         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)",
3055             self, _dynamicViewportUpdateMode, _needsResetViewStateAfterCommitLoadForMainFrame, [_contentView sizeChangedSinceLastVisibleContentRectUpdate], [_scrollView isZoomBouncing], _currentlyAdjustingScrollViewInsetsForKeyboard);
3056         return;
3057     }
3058
3059     CGRect visibleRectInContentCoordinates = [self _visibleContentRect];
3060
3061     UIEdgeInsets computedContentInsetUnadjustedForKeyboard = [self _computedObscuredInset];
3062     if (!_haveSetObscuredInsets)
3063         computedContentInsetUnadjustedForKeyboard.bottom -= _totalScrollViewBottomInsetAdjustmentForKeyboard;
3064
3065     CGFloat scaleFactor = contentZoomScale(self);
3066
3067     CGRect unobscuredRect = UIEdgeInsetsInsetRect(self.bounds, computedContentInsetUnadjustedForKeyboard);
3068     CGRect unobscuredRectInContentCoordinates = _frozenUnobscuredContentRect ? _frozenUnobscuredContentRect.value() : [self convertRect:unobscuredRect toView:_contentView.get()];
3069     unobscuredRectInContentCoordinates = CGRectIntersection(unobscuredRectInContentCoordinates, [self _contentBoundsExtendedForRubberbandingWithScale:scaleFactor]);
3070
3071     // The following logic computes the extent to which the bottom, top, left and right content insets are visible.
3072     auto scrollViewInsets = [_scrollView contentInset];
3073     auto scrollViewBounds = [_scrollView bounds];
3074     auto scrollViewContentSize = [_scrollView contentSize];
3075     auto scrollViewOriginIncludingInset = UIEdgeInsetsInsetRect(scrollViewBounds, computedContentInsetUnadjustedForKeyboard).origin;
3076     auto maximumVerticalScrollExtentWithoutRevealingBottomContentInset = scrollViewContentSize.height - CGRectGetHeight(scrollViewBounds);
3077     auto maximumHorizontalScrollExtentWithoutRevealingRightContentInset = scrollViewContentSize.width - CGRectGetWidth(scrollViewBounds);
3078     auto contentInsets = UIEdgeInsetsZero;
3079     if (scrollViewInsets.left > 0 && scrollViewOriginIncludingInset.x < 0)
3080         contentInsets.left = std::min(-scrollViewOriginIncludingInset.x, scrollViewInsets.left) / scaleFactor;
3081
3082     if (scrollViewInsets.top > 0 && scrollViewOriginIncludingInset.y < 0)
3083         contentInsets.top = std::min(-scrollViewOriginIncludingInset.y, scrollViewInsets.top) / scaleFactor;
3084
3085     if (scrollViewInsets.right > 0 && scrollViewOriginIncludingInset.x > maximumHorizontalScrollExtentWithoutRevealingRightContentInset)
3086         contentInsets.right = std::min(scrollViewOriginIncludingInset.x - maximumHorizontalScrollExtentWithoutRevealingRightContentInset, scrollViewInsets.right) / scaleFactor;
3087
3088     if (scrollViewInsets.bottom > 0 && scrollViewOriginIncludingInset.y > maximumVerticalScrollExtentWithoutRevealingBottomContentInset)
3089         contentInsets.bottom = std::min(scrollViewOriginIncludingInset.y - maximumVerticalScrollExtentWithoutRevealingBottomContentInset, scrollViewInsets.bottom) / scaleFactor;
3090
3091 #if ENABLE(CSS_SCROLL_SNAP) && ENABLE(ASYNC_SCROLLING)
3092     if (inStableState) {
3093         WebKit::RemoteScrollingCoordinatorProxy* coordinator = _page->scrollingCoordinatorProxy();
3094         if (coordinator && coordinator->hasActiveSnapPoint()) {
3095             CGPoint currentPoint = [_scrollView contentOffset];
3096             CGPoint activePoint = coordinator->nearestActiveContentInsetAdjustedSnapPoint(unobscuredRect.origin.y, currentPoint);
3097
3098             if (!CGPointEqualToPoint(activePoint, currentPoint)) {
3099                 RetainPtr<WKScrollView> strongScrollView = _scrollView;
3100                 dispatch_async(dispatch_get_main_queue(), [strongScrollView, activePoint] {
3101                     [strongScrollView setContentOffset:activePoint animated:NO];
3102                 });
3103             }
3104         }
3105     }
3106 #endif
3107
3108     [_contentView didUpdateVisibleRect:visibleRectInContentCoordinates
3109         unobscuredRect:unobscuredRectInContentCoordinates
3110         contentInsets:contentInsets
3111         unobscuredRectInScrollViewCoordinates:unobscuredRect
3112         obscuredInsets:_obscuredInsets
3113         unobscuredSafeAreaInsets:[self _computedUnobscuredSafeAreaInset]
3114         inputViewBounds:_inputViewBounds
3115         scale:scaleFactor minimumScale:[_scrollView minimumZoomScale]
3116         inStableState:inStableState
3117         isChangingObscuredInsetsInteractively:_isChangingObscuredInsetsInteractively
3118         enclosedInScrollableAncestorView:scrollViewCanScroll([self _scroller])];
3119
3120     while (!_visibleContentRectUpdateCallbacks.isEmpty()) {
3121         auto callback = _visibleContentRectUpdateCallbacks.takeLast();
3122         callback();
3123     }
3124     
3125     auto timeNow = MonotonicTime::now();
3126     if ((timeNow - _timeOfRequestForVisibleContentRectUpdate) > delayBeforeNoVisibleContentsRectsLogging)
3127         RELEASE_LOG_IF_ALLOWED("%p -[WKWebView _updateVisibleContentRects:] finally ran %.2fs after being scheduled", self, (timeNow - _timeOfRequestForVisibleContentRectUpdate).value());
3128
3129     _timeOfLastVisibleContentRectUpdate = timeNow;
3130 }
3131
3132 - (void)_didStartProvisionalLoadForMainFrame
3133 {
3134     if (_gestureController)
3135         _gestureController->didStartProvisionalLoadForMainFrame();
3136 }
3137
3138 static WebCore::FloatSize activeMaximumUnobscuredSize(WKWebView *webView, const CGRect& bounds)
3139 {
3140     return WebCore::FloatSize(webView->_overridesMaximumUnobscuredSize ? webView->_maximumUnobscuredSizeOverride : bounds.size);
3141 }
3142
3143 static int32_t activeOrientation(WKWebView *webView)
3144 {
3145     return webView->_overridesInterfaceOrientation ? deviceOrientationForUIInterfaceOrientation(webView->_interfaceOrientationOverride) : webView->_page->deviceOrientation();
3146 }
3147
3148 - (void)_cancelAnimatedResize
3149 {
3150     LOG_WITH_STREAM(VisibleRects, stream << "-[WKWebView " << _page->pageID() << " _cancelAnimatedResize:] " << " _dynamicViewportUpdateMode " << (int)_dynamicViewportUpdateMode);
3151     if (_dynamicViewportUpdateMode == WebKit::DynamicViewportUpdateMode::NotResizing)
3152         return;
3153
3154     if (!_customContentView) {
3155         if (_resizeAnimationView) {
3156             NSUInteger indexOfResizeAnimationView = [[_scrollView subviews] indexOfObject:_resizeAnimationView.get()];
3157             [_scrollView insertSubview:_contentView.get() atIndex:indexOfResizeAnimationView];
3158             [_scrollView insertSubview:[_contentView unscaledView] atIndex:indexOfResizeAnimationView + 1];
3159             [_resizeAnimationView removeFromSuperview];
3160             _resizeAnimationView = nil;
3161         }
3162
3163         [_contentView setHidden:NO];
3164         _resizeAnimationTransformAdjustments = CATransform3DIdentity;
3165     }
3166
3167     _dynamicViewportUpdateMode = WebKit::DynamicViewportUpdateMode::NotResizing;
3168     [self _scheduleVisibleContentRectUpdate];
3169 }
3170
3171 - (void)_didCompleteAnimatedResize
3172 {
3173     if (_dynamicViewportUpdateMode == WebKit::DynamicViewportUpdateMode::NotResizing)
3174         return;
3175
3176     [_contentView setHidden:NO];
3177
3178     if (!_resizeAnimationView) {
3179         // Paranoia. If _resizeAnimationView is null we'll end up setting a zero scale on the content view.
3180         RELEASE_LOG_IF_ALLOWED("%p -[WKWebView _didCompleteAnimatedResize:] - _resizeAnimationView is nil", self);
3181         [self _cancelAnimatedResize];
3182         return;
3183     }
3184
3185     NSUInteger indexOfResizeAnimationView = [[_scrollView subviews] indexOfObject:_resizeAnimationView.get()];
3186     [_scrollView insertSubview:_contentView.get() atIndex:indexOfResizeAnimationView];
3187     [_scrollView insertSubview:[_contentView unscaledView] atIndex:indexOfResizeAnimationView + 1];
3188
3189     CALayer *contentLayer = [_contentView layer];
3190     CGFloat adjustmentScale = _resizeAnimationTransformAdjustments.m11;
3191     contentLayer.sublayerTransform = CATransform3DIdentity;
3192
3193     CGFloat animatingScaleTarget = [[_resizeAnimationView layer] transform].m11;
3194     CATransform3D contentLayerTransform = contentLayer.transform;
3195     CGFloat currentScale = [[_resizeAnimationView layer] transform].m11 * contentLayerTransform.m11;
3196
3197     // We cannot use [UIScrollView setZoomScale:] directly because the UIScrollView delegate would get a callback with
3198     // an invalid contentOffset. The real content offset is only set below.
3199     // Since there is no public API for setting both the zoomScale and the contentOffset, we set the zoomScale manually
3200     // on the zoom layer and then only change the contentOffset.
3201     CGFloat adjustedScale = adjustmentScale * currentScale;
3202     contentLayerTransform.m11 = adjustedScale;
3203     contentLayerTransform.m22 = adjustedScale;
3204     contentLayer.transform = contentLayerTransform;
3205
3206     CGPoint currentScrollOffset = [_scrollView contentOffset];
3207     double horizontalScrollAdjustement = _resizeAnimationTransformAdjustments.m41 * animatingScaleTarget;
3208     double verticalScrollAdjustment = _resizeAnimationTransformAdjustments.m42 * animatingScaleTarget;
3209
3210     [_scrollView setContentSize:roundScrollViewContentSize(*_page, [_contentView frame].size)];
3211     [_scrollView setContentOffset:CGPointMake(currentScrollOffset.x - horizontalScrollAdjustement, currentScrollOffset.y - verticalScrollAdjustment)];
3212
3213     [_resizeAnimationView removeFromSuperview];
3214     _resizeAnimationView = nil;
3215     _resizeAnimationTransformAdjustments = CATransform3DIdentity;
3216
3217     _dynamicViewportUpdateMode = WebKit::DynamicViewportUpdateMode::NotResizing;
3218     [self _scheduleVisibleContentRectUpdate];
3219
3220     CGRect newBounds = self.bounds;
3221     auto newViewLayoutSize = [self activeViewLayoutSize:newBounds];
3222     auto newMaximumUnobscuredSize = activeMaximumUnobscuredSize(self, newBounds);
3223     int32_t newOrientation = activeOrientation(self);
3224
3225     if (!_lastSentViewLayoutSize || newViewLayoutSize != _lastSentViewLayoutSize.value())
3226         [self _dispatchSetViewLayoutSize:newViewLayoutSize];
3227
3228     if (!_lastSentMaximumUnobscuredSize || newMaximumUnobscuredSize != _lastSentMaximumUnobscuredSize.value())
3229         [self _dispatchSetMaximumUnobscuredSize:WebCore::FloatSize(newMaximumUnobscuredSize)];
3230
3231     if (!_lastSentDeviceOrientation || newOrientation != _lastSentDeviceOrientation.value())
3232         [self _dispatchSetDeviceOrientation:newOrientation];
3233
3234     while (!_callbacksDeferredDuringResize.isEmpty())
3235         _callbacksDeferredDuringResize.takeLast()();
3236 }
3237
3238 - (void)_didFinishLoadForMainFrame
3239 {
3240     if (_gestureController)
3241         _gestureController->didFinishLoadForMainFrame();
3242 }
3243
3244 - (void)_didFailLoadForMainFrame
3245 {
3246     if (_gestureController)
3247         _gestureController->didFailLoadForMainFrame();
3248 }
3249
3250 - (void)_didSameDocumentNavigationForMainFrame:(WebKit::SameDocumentNavigationType)navigationType
3251 {
3252     [_customContentView web_didSameDocumentNavigation:toAPI(navigationType)];
3253
3254     if (_gestureController)
3255         _gestureController->didSameDocumentNavigationForMainFrame(navigationType);
3256 }
3257
3258 - (void)_keyboardChangedWithInfo:(NSDictionary *)keyboardInfo adjustScrollView:(BOOL)adjustScrollView
3259 {
3260     NSValue *endFrameValue = [keyboardInfo objectForKey:UIKeyboardFrameEndUserInfoKey];
3261     if (!endFrameValue)
3262         return;
3263
3264     // The keyboard rect is always in screen coordinates. In the view services case the window does not
3265     // have the interface orientation rotation transformation; its host does. So, it makes no sense to
3266     // clip the keyboard rect against its screen.
3267     if ([[self window] _isHostedInAnotherProcess])
3268         _inputViewBounds = [self.window convertRect:[endFrameValue CGRectValue] fromWindow:nil];
3269     else
3270         _inputViewBounds = [self.window convertRect:CGRectIntersection([endFrameValue CGRectValue], self.window.screen.bounds) fromWindow:nil];
3271
3272     if ([[UIPeripheralHost sharedInstance] isUndocked])
3273         _inputViewBounds = CGRectZero;
3274
3275     if (adjustScrollView) {
3276         CGFloat bottomInsetBeforeAdjustment = [_scrollView contentInset].bottom;
3277         SetForScope<BOOL> insetAdjustmentGuard(_currentlyAdjustingScrollViewInsetsForKeyboard, YES);
3278         [_scrollView _adjustForAutomaticKeyboardInfo:keyboardInfo animated:YES lastAdjustment:&_lastAdjustmentForScroller];
3279         CGFloat bottomInsetAfterAdjustment = [_scrollView contentInset].bottom;
3280         if (bottomInsetBeforeAdjustment != bottomInsetAfterAdjustment)
3281             _totalScrollViewBottomInsetAdjustmentForKeyboard += bottomInsetAfterAdjustment - bottomInsetBeforeAdjustment;
3282     }
3283
3284     [self _scheduleVisibleContentRectUpdate];
3285 }
3286
3287 - (BOOL)_shouldUpdateKeyboardWithInfo:(NSDictionary *)keyboardInfo
3288 {
3289     if ([_contentView isFocusingElement])
3290         return YES;
3291
3292     NSNumber *isLocalKeyboard = [keyboardInfo valueForKey:UIKeyboardIsLocalUserInfoKey];
3293     return isLocalKeyboard && !isLocalKeyboard.boolValue;
3294 }
3295
3296 - (void)_keyboardWillChangeFrame:(NSNotification *)notification
3297 {
3298     if ([self _shouldUpdateKeyboardWithInfo:notification.userInfo])
3299         [self _keyboardChangedWithInfo:notification.userInfo adjustScrollView:YES];
3300 }
3301
3302 - (void)_keyboardDidChangeFrame:(NSNotification *)notification
3303 {
3304     [self _keyboardChangedWithInfo:notification.userInfo adjustScrollView:NO];
3305 }
3306
3307 - (void)_keyboardWillShow:(NSNotification *)notification
3308 {
3309     if ([self _shouldUpdateKeyboardWithInfo:notification.userInfo])
3310         [self _keyboardChangedWithInfo:notification.userInfo adjustScrollView:YES];
3311
3312     _page->setIsKeyboardAnimatingIn(true);
3313 }
3314
3315 - (void)_keyboardDidShow:(NSNotification *)notification
3316 {
3317     _page->setIsKeyboardAnimatingIn(false);
3318 }
3319
3320 - (void)_keyboardWillHide:(NSNotification *)notification
3321 {
3322     // Ignore keyboard will hide notifications sent during rotation. They're just there for
3323     // backwards compatibility reasons and processing the will hide notification would
3324     // temporarily screw up the unobscured view area.
3325     if ([[UIPeripheralHost sharedInstance] rotationState])
3326         return;
3327
3328     [self _keyboardChangedWithInfo:notification.userInfo adjustScrollView:YES];
3329 }
3330
3331 static void hardwareKeyboardAvailabilityChangedCallback(CFNotificationCenterRef, void* observer, CFStringRef, const void*, CFDictionaryRef)
3332 {
3333     ASSERT(observer);
3334     WKWebView *webView = (__bridge WKWebView *)observer;
3335     webView._page->hardwareKeyboardAvailabilityChanged(GSEventIsHardwareKeyboardAttached());
3336 }
3337
3338 - (void)_windowDidRotate:(NSNotification *)notification
3339 {
3340     if (!_overridesInterfaceOrientation)
3341         [self _dispatchSetDeviceOrientation:deviceOrientation()];
3342 }
3343
3344 - (void)_contentSizeCategoryDidChange:(NSNotification *)notification
3345 {
3346     _page->contentSizeCategoryDidChange([self _contentSizeCategory]);
3347 }
3348
3349 - (NSString *)_contentSizeCategory
3350 {
3351     return [[UIApplication sharedApplication] preferredContentSizeCategory];
3352 }
3353
3354 - (void)_accessibilitySettingsDidChange:(NSNotification *)notification
3355 {
3356     _page->accessibilitySettingsDidChange();
3357 }
3358
3359 - (void)setAllowsBackForwardNavigationGestures:(BOOL)allowsBackForwardNavigationGestures
3360 {
3361     if (_allowsBackForwardNavigationGestures == allowsBackForwardNavigationGestures)
3362         return;
3363
3364     _allowsBackForwardNavigationGestures = allowsBackForwardNavigationGestures;
3365
3366     if (allowsBackForwardNavigationGestures && !_gestureController) {
3367         _gestureController = std::make_unique<WebKit::ViewGestureController>(*_page);
3368         _gestureController->installSwipeHandler(self, [self scrollView]);
3369         if (WKWebView *alternateWebView = [_configuration _alternateWebViewForNavigationGestures])
3370             _gestureController->setAlternateBackForwardListSourcePage(alternateWebView->_page.get());
3371     }
3372
3373     if (_gestureController)
3374         _gestureController->setSwipeGestureEnabled(allowsBackForwardNavigationGestures);
3375
3376     _page->setShouldRecordNavigationSnapshots(allowsBackForwardNavigationGestures);
3377 }
3378
3379 - (BOOL)allowsBackForwardNavigationGestures
3380 {
3381     return _allowsBackForwardNavigationGestures;
3382 }
3383
3384 - (BOOL)_isNavigationSwipeGestureRecognizer:(UIGestureRecognizer *)recognizer
3385 {
3386     if (!_gestureController)
3387         return NO;
3388     return _gestureController->isNavigationSwipeGestureRecognizer(recognizer);
3389 }
3390
3391 - (void)_navigationGestureDidBegin
3392 {
3393     // During a back/forward swipe, there's a view interposed between this view and the content view that has
3394     // an offset and animation on it, which results in computing incorrect rectangles. Work around by using
3395     // frozen rects during swipes.
3396     CGRect fullViewRect = self.bounds;
3397     CGRect unobscuredRect = UIEdgeInsetsInsetRect(fullViewRect, [self _computedObscuredInset]);
3398
3399     _frozenVisibleContentRect = [self convertRect:fullViewRect toView:_contentView.get()];
3400     _frozenUnobscuredContentRect = [self convertRect:unobscuredRect toView:_contentView.get()];
3401
3402     LOG_WITH_STREAM(VisibleRects, stream << "_navigationGestureDidBegin: freezing visibleContentRect " << WebCore::FloatRect(_frozenVisibleContentRect.value()) << " UnobscuredContentRect " << WebCore::FloatRect(_frozenUnobscuredContentRect.value()));
3403 }
3404
3405 - (void)_navigationGestureDidEnd
3406 {
3407     _frozenVisibleContentRect = WTF::nullopt;
3408     _frozenUnobscuredContentRect = WTF::nullopt;
3409 }
3410
3411 - (void)_showPasswordViewWithDocumentName:(NSString *)documentName passwordHandler:(void (^)(NSString *))passwordHandler
3412 {
3413     ASSERT(!_passwordView);
3414     _passwordView = adoptNS([[WKPasswordView alloc] initWithFrame:self.bounds documentName:documentName]);
3415     [_passwordView setUserDidEnterPassword:passwordHandler];
3416     [_passwordView showInScrollView:_scrollView.get()];
3417     self._currentContentView.hidden = YES;
3418 }
3419
3420 - (void)_hidePasswordView
3421 {
3422     if (!_passwordView)
3423         return;
3424
3425     self._currentContentView.hidden = NO;
3426     [_passwordView hide];
3427     _passwordView = nil;
3428 }
3429
3430 - (WKPasswordView *)_passwordView
3431 {
3432     return _passwordView.get();
3433 }
3434
3435 - (void)_updateScrollViewInsetAdjustmentBehavior
3436 {
3437 #if __IPHONE_OS_VERSION_MIN_REQUIRED >= 110000
3438     if (![_scrollView _contentInsetAdjustmentBehaviorWasExternallyOverridden])
3439         [_scrollView _setContentInsetAdjustmentBehaviorInternal:self._safeAreaShouldAffectObscuredInsets ? UIScrollViewContentInsetAdjustmentAlways : UIScrollViewContentInsetAdjustmentNever];
3440 #endif
3441 }
3442
3443 - (void)_setAvoidsUnsafeArea:(BOOL)avoidsUnsafeArea
3444 {
3445     if (_avoidsUnsafeArea == avoidsUnsafeArea)
3446         return;
3447
3448     _avoidsUnsafeArea = avoidsUnsafeArea;
3449
3450     [self _updateScrollViewInsetAdjustmentBehavior];
3451     [self _scheduleVisibleContentRectUpdate];
3452
3453     id <WKUIDelegatePrivate> uiDelegate = (id <WKUIDelegatePrivate>)[self UIDelegate];
3454     if ([uiDelegate respondsToSelector:@selector(_webView:didChangeSafeAreaShouldAffectObscuredInsets:)])
3455         [uiDelegate _webView:self didChangeSafeAreaShouldAffectObscuredInsets:avoidsUnsafeArea];
3456 }
3457
3458 - (BOOL)_haveSetObscuredInsets
3459 {
3460     return _haveSetObscuredInsets;
3461 }
3462
3463 #endif // PLATFORM(IOS_FAMILY)
3464
3465 #if ENABLE(ACCESSIBILITY_EVENTS)
3466
3467 static void accessibilityEventsEnabledChangedCallback(CFNotificationCenterRef, void* observer, CFStringRef, const void*, CFDictionaryRef)
3468 {
3469     ASSERT(observer);
3470     WKWebView *webview = (__bridge WKWebView *)observer;
3471     [webview _updateAccessibilityEventsEnabled];
3472 }
3473
3474 - (void)_updateAccessibilityEventsEnabled
3475 {
3476     if (!isNullFunctionPointer(_AXSWebAccessibilityEventsEnabled))
3477         _page->updateAccessibilityEventsEnabled(_AXSWebAccessibilityEventsEnabled());
3478 }
3479
3480 #endif
3481
3482 #pragma mark OS X-specific methods
3483
3484 #if PLATFORM(MAC)
3485
3486 - (BOOL)acceptsFirstResponder
3487 {
3488     return _impl->acceptsFirstResponder();
3489 }
3490
3491 - (BOOL)becomeFirstResponder
3492 {
3493     return _impl->becomeFirstResponder();
3494 }
3495
3496 - (BOOL)resignFirstResponder
3497 {
3498     return _impl->resignFirstResponder();
3499 }
3500
3501 - (void)viewWillStartLiveResize
3502 {
3503     _impl->viewWillStartLiveResize();
3504 }
3505
3506 - (void)viewDidEndLiveResize
3507 {
3508     _impl->viewDidEndLiveResize();
3509 }
3510
3511 - (BOOL)isFlipped
3512 {
3513     return YES;
3514 }
3515
3516 - (NSSize)intrinsicContentSize
3517 {
3518     return NSSizeFromCGSize(_impl->intrinsicContentSize());
3519 }
3520
3521 - (void)prepareContentInRect:(NSRect)rect
3522 {
3523     _impl->prepareContentInRect(NSRectToCGRect(rect));
3524 }
3525
3526 - (void)setFrameSize:(NSSize)size
3527 {
3528     [super setFrameSize:size];
3529     [_safeBrowsingWarning setFrame:self.bounds];
3530     _impl->setFrameSize(NSSizeToCGSize(size));
3531 }
3532
3533 IGNORE_WARNINGS_BEGIN("deprecated-implementations")
3534 - (void)renewGState
3535 IGNORE_WARNINGS_END
3536 {
3537     _impl->renewGState();
3538     [super renewGState];
3539 }
3540
3541 #define WEBCORE_COMMAND(command) - (void)command:(id)sender { _impl->executeEditCommandForSelector(_cmd); }
3542
3543 WEBCORE_COMMAND(alignCenter)
3544 WEBCORE_COMMAND(alignJustified)
3545 WEBCORE_COMMAND(alignLeft)
3546 WEBCORE_COMMAND(alignRight)
3547 WEBCORE_COMMAND(copy)
3548 WEBCORE_COMMAND(cut)
3549 WEBCORE_COMMAND(delete)
3550 WEBCORE_COMMAND(deleteBackward)
3551 WEBCORE_COMMAND(deleteBackwardByDecomposingPreviousCharacter)
3552 WEBCORE_COMMAND(deleteForward)
3553 WEBCORE_COMMAND(deleteToBeginningOfLine)
3554 WEBCORE_COMMAND(deleteToBeginningOfParagraph)
3555 WEBCORE_COMMAND(deleteToEndOfLine)
3556 WEBCORE_COMMAND(deleteToEndOfParagraph)
3557 WEBCORE_COMMAND(deleteToMark)
3558 WEBCORE_COMMAND(deleteWordBackward)
3559 WEBCORE_COMMAND(deleteWordForward)
3560 WEBCORE_COMMAND(ignoreSpelling)
3561 WEBCORE_COMMAND(indent)
3562 WEBCORE_COMMAND(insertBacktab)
3563 WEBCORE_COMMAND(insertLineBreak)
3564 WEBCORE_COMMAND(insertNewline)
3565 WEBCORE_COMMAND(insertNewlineIgnoringFieldEditor)
3566 WEBCORE_COMMAND(insertParagraphSeparator)
3567 WEBCORE_COMMAND(insertTab)
3568 WEBCORE_COMMAND(insertTabIgnoringFieldEditor)
3569 WEBCORE_COMMAND(makeTextWritingDirectionLeftToRight)
3570 WEBCORE_COMMAND(makeTextWritingDirectionNatural)
3571 WEBCORE_COMMAND(makeTextWritingDirectionRightToLeft)
3572 WEBCORE_COMMAND(moveBackward)
3573 WEBCORE_COMMAND(moveBackwardAndModifySelection)
3574 WEBCORE_COMMAND(moveDown)
3575 WEBCORE_COMMAND(moveDownAndModifySelection)
3576 WEBCORE_COMMAND(moveForward)
3577 WEBCORE_COMMAND(moveForwardAndModifySelection)
3578 WEBCORE_COMMAND(moveLeft)
3579 WEBCORE_COMMAND(moveLeftAndModifySelection)
3580 WEBCORE_COMMAND(moveParagraphBackwardAndModifySelection)
3581 WEBCORE_COMMAND(moveParagraphForwardAndModifySelection)
3582 WEBCORE_COMMAND(moveRight)
3583 WEBCORE_COMMAND(moveRightAndModifySelection)
3584 WEBCORE_COMMAND(moveToBeginningOfDocument)
3585 WEBCORE_COMMAND(moveToBeginningOfDocumentAndModifySelection)
3586 WEBCORE_COMMAND(moveToBeginningOfLine)
3587 WEBCORE_COMMAND(moveToBeginningOfLineAndModifySelection)
3588 WEBCORE_COMMAND(moveToBeginningOfParagraph)
3589 WEBCORE_COMMAND(moveToBeginningOfParagraphAndModifySelection)
3590 WEBCORE_COMMAND(moveToBeginningOfSentence)
3591 WEBCORE_COMMAND(moveToBeginningOfSentenceAndModifySelection)
3592 WEBCORE_COMMAND(moveToEndOfDocument)
3593 WEBCORE_COMMAND(moveToEndOfDocumentAndModifySelection)
3594 WEBCORE_COMMAND(moveToEndOfLine)
3595 WEBCORE_COMMAND(moveToEndOfLineAndModifySelection)
3596 WEBCORE_COMMAND(moveToEndOfParagraph)
3597 WEBCORE_COMMAND(moveToEndOfParagraphAndModifySelection)
3598 WEBCORE_COMMAND(moveToEndOfSentence)
3599 WEBCORE_COMMAND(moveToEndOfSentenceAndModifySelection)
3600 WEBCORE_COMMAND(moveToLeftEndOfLine)
3601 WEBCORE_COMMAND(moveToLeftEndOfLineAndModifySelection)
3602 WEBCORE_COMMAND(moveToRightEndOfLine)
3603 WEBCORE_COMMAND(moveToRightEndOfLineAndModifySelection)
3604 WEBCORE_COMMAND(moveUp)
3605 WEBCORE_COMMAND(moveUpAndModifySelection)
3606 WEBCORE_COMMAND(moveWordBackward)
3607 WEBCORE_COMMAND(moveWordBackwardAndModifySelection)
3608 WEBCORE_COMMAND(moveWordForward)
3609 WEBCORE_COMMAND(moveWordForwardAndModifySelection)
3610 WEBCORE_COMMAND(moveWordLeft)
3611 WEBCORE_COMMAND(moveWordLeftAndModifySelection)
3612 WEBCORE_COMMAND(moveWordRight)
3613 WEBCORE_COMMAND(moveWordRightAndModifySelection)
3614 WEBCORE_COMMAND(outdent)
3615 WEBCORE_COMMAND(pageDown)
3616 WEBCORE_COMMAND(pageDownAndModifySelection)
3617 WEBCORE_COMMAND(pageUp)
3618 WEBCORE_COMMAND(pageUpAndModifySelection)
3619 WEBCORE_COMMAND(paste)
3620 WEBCORE_COMMAND(pasteAsPlainText)
3621 WEBCORE_COMMAND(scrollPageDown)
3622 WEBCORE_COMMAND(scrollPageUp)
3623 WEBCORE_COMMAND(scrollLineDown)
3624 WEBCORE_COMMAND(scrollLineUp)
3625 WEBCORE_COMMAND(scrollToBeginningOfDocument)
3626 WEBCORE_COMMAND(scrollToEndOfDocument)
3627 WEBCORE_COMMAND(selectAll)
3628 WEBCORE_COMMAND(selectLine)
3629 WEBCORE_COMMAND(selectParagraph)
3630 WEBCORE_COMMAND(selectSentence)
3631 WEBCORE_COMMAND(selectToMark)
3632 WEBCORE_COMMAND(selectWord)
3633 WEBCORE_COMMAND(setMark)
3634 WEBCORE_COMMAND(subscript)
3635 WEBCORE_COMMAND(superscript)
3636 WEBCORE_COMMAND(swapWithMark)
3637 WEBCORE_COMMAND(takeFindStringFromSelection)
3638 WEBCORE_COMMAND(transpose)
3639 WEBCORE_COMMAND(underline)
3640 WEBCORE_COMMAND(unscript)
3641 WEBCORE_COMMAND(yank)
3642 WEBCORE_COMMAND(yankAndSelect)
3643
3644 #undef WEBCORE_COMMAND
3645
3646 - (BOOL)writeSelectionToPasteboard:(NSPasteboard *)pasteboard types:(NSArray *)types
3647 {
3648     return _impl->writeSelectionToPasteboard(pasteboard, types);
3649 }
3650
3651 - (void)centerSelectionInVisibleArea:(id)sender
3652 {
3653     _impl->centerSelectionInVisibleArea();
3654 }
3655
3656 - (id)validRequestorForSendType:(NSString *)sendType returnType:(NSString *)returnType
3657 {
3658     return _impl->validRequestorForSendAndReturnTypes(sendType, returnType);
3659 }
3660
3661 - (BOOL)readSelectionFromPasteboard:(NSPasteboard *)pasteboard
3662 {
3663     return _impl->readSelectionFromPasteboard(pasteboard);
3664 }
3665
3666 - (void)changeFont:(id)sender
3667 {
3668     _impl->changeFontFromFontManager();
3669 }
3670
3671 - (void)changeColor:(id)sender
3672 {
3673     _impl->changeFontColorFromSender(sender);
3674 }
3675
3676 - (void)changeAttributes:(id)sender
3677 {
3678     _impl->changeFontAttributesFromSender(sender);
3679 }
3680
3681 - (IBAction)startSpeaking:(id)sender
3682 {
3683     _impl->startSpeaking();
3684 }
3685
3686 - (IBAction)stopSpeaking:(id)sender
3687 {
3688     _impl->stopSpeaking(sender);
3689 }
3690
3691 - (IBAction)showGuessPanel:(id)sender
3692 {
3693     _impl->showGuessPanel(sender);
3694 }
3695
3696 - (IBAction)checkSpelling:(id)sender
3697 {
3698     _impl->checkSpelling();
3699 }
3700
3701 - (void)changeSpelling:(id)sender
3702 {
3703     _impl->changeSpelling(sender);
3704 }
3705
3706 - (IBAction)toggleContinuousSpellChecking:(id)sender
3707 {
3708     _impl->toggleContinuousSpellChecking();
3709 }
3710
3711 - (BOOL)isGrammarCheckingEnabled
3712 {
3713     return _impl->isGrammarCheckingEnabled();
3714 }
3715
3716 - (void)setGrammarCheckingEnabled:(BOOL)flag
3717 {
3718     _impl->setGrammarCheckingEnabled(flag);
3719 }
3720
3721 - (IBAction)toggleGrammarChecking:(id)sender
3722 {
3723     _impl->toggleGrammarChecking();
3724 }
3725
3726 - (IBAction)toggleAutomaticSpellingCorrection:(id)sender
3727 {
3728     _impl->toggleAutomaticSpellingCorrection();
3729 }
3730
3731 - (void)orderFrontSubstitutionsPanel:(id)sender
3732 {
3733     _impl->orderFrontSubstitutionsPanel(sender);
3734 }
3735
3736 - (IBAction)toggleSmartInsertDelete:(id)sender
3737 {
3738     _impl->toggleSmartInsertDelete();
3739 }
3740
3741 - (BOOL)isAutomaticQuoteSubstitutionEnabled
3742 {
3743     return _impl->isAutomaticQuoteSubstitutionEnabled();
3744 }
3745
3746 - (void)setAutomaticQuoteSubstitutionEnabled:(BOOL)flag
3747 {
3748     _impl->setAutomaticQuoteSubstitutionEnabled(flag);
3749 }
3750
3751 - (void)toggleAutomaticQuoteSubstitution:(id)sender
3752 {
3753     _impl->toggleAutomaticQuoteSubstitution();
3754 }
3755
3756 - (BOOL)isAutomaticDashSubstitutionEnabled
3757 {
3758     return _impl->isAutomaticDashSubstitutionEnabled();
3759 }
3760
3761 - (void)setAutomaticDashSubstitutionEnabled:(BOOL)flag
3762 {
3763     _impl->setAutomaticDashSubstitutionEnabled(flag);
3764 }
3765
3766 - (void)toggleAutomaticDashSubstitution:(id)sender
3767 {
3768     _impl->toggleAutomaticDashSubstitution();
3769 }
3770
3771 - (BOOL)isAutomaticLinkDetectionEnabled
3772 {
3773     return _impl->isAutomaticLinkDetectionEnabled();
3774 }
3775
3776 - (void)setAutomaticLinkDetectionEnabled:(BOOL)flag
3777 {
3778     _impl->setAutomaticLinkDetectionEnabled(flag);
3779 }
3780
3781 - (void)toggleAutomaticLinkDetection:(id)sender
3782 {
3783     _impl->toggleAutomaticLinkDetection();
3784 }
3785
3786 - (BOOL)isAutomaticTextReplacementEnabled
3787 {
3788     return _impl->isAutomaticTextReplacementEnabled();
3789 }
3790
3791 - (void)setAutomaticTextReplacementEnabled:(BOOL)flag
3792 {
3793     _impl->setAutomaticTextReplacementEnabled(flag);
3794 }
3795
3796 - (void)toggleAutomaticTextReplacement:(id)sender
3797 {
3798     _impl->toggleAutomaticTextReplacement();
3799 }
3800
3801 - (void)uppercaseWord:(id)sender
3802 {
3803     _impl->uppercaseWord();
3804 }
3805
3806 - (void)lowercaseWord:(id)sender
3807 {
3808     _impl->lowercaseWord();
3809 }
3810
3811 - (void)capitalizeWord:(id)sender
3812 {
3813     _impl->capitalizeWord();
3814 }
3815
3816 - (BOOL)_wantsKeyDownForEvent:(NSEvent *)event
3817 {
3818     return _impl->wantsKeyDownForEvent(event);
3819 }
3820
3821 - (void)scrollWheel:(NSEvent *)event
3822 {
3823     _impl->scrollWheel(event);
3824 }
3825
3826 - (void)swipeWithEvent:(NSEvent *)event
3827 {
3828     _impl->swipeWithEvent(event);
3829 }
3830
3831 - (void)mouseMoved:(NSEvent *)event
3832 {
3833     _impl->mouseMoved(event);
3834 }
3835
3836 - (void)mouseDown:(NSEvent *)event
3837 {
3838     _impl->mouseDown(event);
3839 }
3840
3841 - (void)mouseUp:(NSEvent *)event
3842 {
3843     _impl->mouseUp(event);
3844 }
3845
3846 - (void)mouseDragged:(NSEvent *)event
3847 {
3848     _impl->mouseDragged(event);
3849 }
3850
3851 - (void)mouseEntered:(NSEvent *)event
3852 {
3853     _impl->mouseEntered(event);
3854 }
3855
3856 - (void)mouseExited:(NSEvent *)event
3857 {
3858     _impl->mouseExited(event);
3859 }
3860
3861 - (void)otherMouseDown:(NSEvent *)event
3862 {
3863     _impl->otherMouseDown(event);
3864 }
3865
3866 - (void)otherMouseDragged:(NSEvent *)event
3867 {
3868     _impl->otherMouseDragged(event);
3869 }
3870
3871 - (void)otherMouseUp:(NSEvent *)event
3872 {
3873     _impl->otherMouseUp(event);
3874 }
3875
3876 - (void)rightMouseDown:(NSEvent *)event
3877 {
3878     _impl->rightMouseDown(event);
3879 }
3880
3881 - (void)rightMouseDragged:(NSEvent *)event
3882 {
3883     _impl->rightMouseDragged(event);
3884 }
3885
3886 - (void)rightMouseUp:(NSEvent *)event
3887 {
3888     _impl->rightMouseUp(event);
3889 }
3890
3891 - (void)pressureChangeWithEvent:(NSEvent *)event
3892 {
3893     _impl->pressureChangeWithEvent(event);
3894 }
3895
3896 - (BOOL)acceptsFirstMouse:(NSEvent *)event
3897 {
3898     return _impl->acceptsFirstMouse(event);
3899 }
3900
3901 - (BOOL)shouldDelayWindowOrderingForEvent:(NSEvent *)event
3902 {
3903     return _impl->shouldDelayWindowOrderingForEvent(event);
3904 }
3905
3906 - (void)doCommandBySelector:(SEL)selector
3907 {
3908     _impl->doCommandBySelector(selector);
3909 }
3910
3911 - (void)insertText:(id)string
3912 {
3913     _impl->insertText(string);
3914 }
3915
3916 - (void)insertText:(id)string replacementRange:(NSRange)replacementRange
3917 {
3918     _impl->insertText(string, replacementRange);
3919 }
3920
3921 - (NSTextInputContext *)inputContext
3922 {
3923     if (!_impl)
3924         return nil;
3925     return _impl->inputContext();
3926 }
3927
3928 - (BOOL)performKeyEquivalent:(NSEvent *)event
3929 {
3930     return _impl->performKeyEquivalent(event);
3931 }
3932
3933 - (void)keyUp:(NSEvent *)theEvent
3934 {
3935     _impl->keyUp(theEvent);
3936 }
3937
3938 - (void)keyDown:(NSEvent *)theEvent
3939 {
3940     _impl->keyDown(theEvent);
3941 }
3942
3943 - (void)flagsChanged:(NSEvent *)theEvent
3944 {
3945     _impl->flagsChanged(theEvent);
3946 }
3947
3948 - (void)setMarkedText:(id)string selectedRange:(NSRange)newSelectedRange replacementRange:(NSRange)replacementRange
3949 {
3950     _impl->setMarkedText(string, newSelectedRange, replacementRange);
3951 }
3952
3953 - (void)unmarkText
3954 {
3955     _impl->unmarkText();
3956 }
3957
3958 - (NSRange)selectedRange
3959 {
3960     return _impl->selectedRange();
3961 }
3962
3963 - (BOOL)hasMarkedText
3964 {
3965     return _impl->hasMarkedText();
3966 }
3967
3968 - (NSRange)markedRange
3969 {
3970     return _impl->markedRange();
3971 }
3972
3973 - (NSAttributedString *)attributedSubstringForProposedRange:(NSRange)nsRange actualRange:(NSRangePointer)actualRange
3974 {
3975     return _impl->attributedSubstringForProposedRange(nsRange, actualRange);
3976 }
3977
3978 - (NSUInteger)characterIndexForPoint:(NSPoint)thePoint
3979 {
3980     return _impl->characterIndexForPoint(thePoint);
3981 }
3982
3983 - (void)typingAttributesWithCompletionHandler:(void(^)(NSDictionary<NSString *, id> *))completion
3984 {
3985     _impl->typingAttributesWithCompletionHandler(completion);
3986 }
3987
3988 - (NSRect)firstRectForCharacterRange:(NSRange)theRange actualRange:(NSRangePointer)actualRange
3989 {
3990     return _impl->firstRectForCharacterRange(theRange, actualRange);
3991 }
3992
3993 - (void)selectedRangeWithCompletionHandler:(void(^)(NSRange selectedRange))completionHandlerPtr
3994 {
3995     _impl->selectedRangeWithCompletionHandler(completionHandlerPtr);
3996 }
3997
3998 - (void)markedRangeWithCompletionHandler:(void(^)(NSRange markedRange))completionHandlerPtr
3999 {
4000     _impl->markedRangeWithCompletionHandler(completionHandlerPtr);
4001 }
4002
4003 - (void)hasMarkedTextWithCompletionHandler:(void(^)(BOOL hasMarkedText))completionHandlerPtr
4004 {
4005     _impl->hasMarkedTextWithCompletionHandler(completionHandlerPtr);
4006 }
4007
4008 - (void)attributedSubstringForProposedRange:(NSRange)nsRange completionHandler:(void(^)(NSAttributedString *attrString, NSRange actualRange))completionHandlerPtr
4009 {
4010     _impl->attributedSubstringForProposedRange(nsRange, completionHandlerPtr);
4011 }
4012
4013 - (void)firstRectForCharacterRange:(NSRange)theRange completionHandler:(void(^)(NSRect firstRect, NSRange actualRange))completionHandlerPtr
4014 {
4015     _impl->firstRectForCharacterRange(theRange, completionHandlerPtr);
4016 }
4017
4018 - (void)characterIndexForPoint:(NSPoint)thePoint completionHandler:(void(^)(NSUInteger))completionHandlerPtr
4019 {
4020     _impl->characterIndexForPoint(thePoint, completionHandlerPtr);
4021 }
4022
4023 - (NSArray *)validAttributesForMarkedText
4024 {
4025     return _impl->validAttributesForMarkedText();
4026 }
4027
4028 #if ENABLE(DRAG_SUPPORT)
4029 IGNORE_WARNINGS_BEGIN("deprecated-implementations")
4030 - (void)draggedImage:(NSImage *)image endedAt:(NSPoint)endPoint operation:(NSDragOperation)operation
4031 IGNORE_WARNINGS_END
4032 {
4033     _impl->draggedImage(image, NSPointToCGPoint(endPoint), operation);
4034 }
4035
4036 - (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)draggingInfo
4037 {
4038     return _impl->draggingEntered(draggingInfo);
4039 }
4040
4041 - (NSDragOperation)draggingUpdated:(id <NSDraggingInfo>)draggingInfo
4042 {
4043     return _impl->draggingUpdated(draggingInfo);