2011-04-21 Simon Fraser <simon.fraser@apple.com>
[WebKit-https.git] / Source / WebCore / rendering / RenderFileUploadControl.cpp
1 /*
2  * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Library General Public
6  * License as published by the Free Software Foundation; either
7  * version 2 of the License, or (at your option) any later version.
8  *
9  * This library is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12  * Library General Public License for more details.
13  *
14  * You should have received a copy of the GNU Library General Public License
15  * along with this library; see the file COPYING.LIB.  If not, write to
16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17  * Boston, MA 02110-1301, USA.
18  *
19  */
20
21 #include "config.h"
22 #include "RenderFileUploadControl.h"
23
24 #include "Chrome.h"
25 #include "FileList.h"
26 #include "Frame.h"
27 #include "FrameView.h"
28 #include "GraphicsContext.h"
29 #include "HTMLInputElement.h"
30 #include "HTMLNames.h"
31 #include "ShadowElement.h"
32 #include "Icon.h"
33 #include "LocalizedStrings.h"
34 #include "Page.h"
35 #include "PaintInfo.h"
36 #include "RenderButton.h"
37 #include "RenderText.h"
38 #include "RenderTheme.h"
39 #include "RenderView.h"
40 #include "TextRun.h"
41 #include <math.h>
42
43 using namespace std;
44
45 namespace WebCore {
46
47 using namespace HTMLNames;
48
49 const int afterButtonSpacing = 4;
50 const int iconHeight = 16;
51 const int iconWidth = 16;
52 const int iconFilenameSpacing = 2;
53 const int defaultWidthNumChars = 34;
54 const int buttonShadowHeight = 2;
55
56 RenderFileUploadControl::RenderFileUploadControl(HTMLInputElement* input)
57     : RenderBlock(input)
58 {
59     FileList* list = input->files();
60     Vector<String> filenames;
61     unsigned length = list ? list->length() : 0;
62     for (unsigned i = 0; i < length; ++i)
63         filenames.append(list->item(i)->path());
64     m_fileChooser = FileChooser::create(this, filenames);
65 }
66
67 RenderFileUploadControl::~RenderFileUploadControl()
68 {
69     if (m_button)
70         m_button->detach();
71     m_fileChooser->disconnectClient();
72 }
73
74 void RenderFileUploadControl::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
75 {
76     RenderBlock::styleDidChange(diff, oldStyle);
77     if (m_button)
78         m_button->renderer()->setStyle(createButtonStyle(style()));
79 }
80
81 void RenderFileUploadControl::valueChanged()
82 {
83     // dispatchFormControlChangeEvent may destroy this renderer
84     RefPtr<FileChooser> fileChooser = m_fileChooser;
85
86     HTMLInputElement* inputElement = static_cast<HTMLInputElement*>(node());
87     inputElement->setFileListFromRenderer(fileChooser->filenames());
88     inputElement->dispatchFormControlChangeEvent();
89  
90     // only repaint if it doesn't seem we have been destroyed
91     if (!fileChooser->disconnected())
92         repaint();
93 }
94
95 bool RenderFileUploadControl::allowsMultipleFiles()
96 {
97 #if ENABLE(DIRECTORY_UPLOAD)
98     if (allowsDirectoryUpload())
99       return true;
100 #endif
101
102     HTMLInputElement* input = static_cast<HTMLInputElement*>(node());
103     return input->fastHasAttribute(multipleAttr);
104 }
105
106 #if ENABLE(DIRECTORY_UPLOAD)
107 bool RenderFileUploadControl::allowsDirectoryUpload()
108 {
109     HTMLInputElement* input = static_cast<HTMLInputElement*>(node());
110     return input->fastHasAttribute(webkitdirectoryAttr);
111 }
112
113 void RenderFileUploadControl::receiveDropForDirectoryUpload(const Vector<String>& paths)
114 {
115     if (Chrome* chromePointer = chrome())
116         chromePointer->enumerateChosenDirectory(paths[0], m_fileChooser.get());
117 }
118 #endif
119
120 String RenderFileUploadControl::acceptTypes()
121 {
122     return static_cast<HTMLInputElement*>(node())->accept();
123 }
124
125 void RenderFileUploadControl::chooseIconForFiles(FileChooser* chooser, const Vector<String>& filenames)
126 {
127     if (Chrome* chromePointer = chrome())
128         chromePointer->chooseIconForFiles(filenames, chooser);
129 }
130
131 void RenderFileUploadControl::click()
132 {
133     // Requires a user gesture to open the file dialog.
134     if (!frame() || !frame()->loader()->isProcessingUserGesture())
135         return;
136     if (Chrome* chromePointer = chrome())
137         chromePointer->runOpenPanel(frame(), m_fileChooser);
138 }
139
140 Chrome* RenderFileUploadControl::chrome() const
141 {
142     Frame* frame = node()->document()->frame();
143     if (!frame)
144         return 0;
145     Page* page = frame->page();
146     if (!page)
147         return 0;
148     return page->chrome();
149 }
150
151 void RenderFileUploadControl::updateFromElement()
152 {
153     HTMLInputElement* inputElement = static_cast<HTMLInputElement*>(node());
154     ASSERT(inputElement->isFileUpload());
155     
156     if (!m_button) {
157         m_button = ShadowInputElement::create(inputElement);
158         m_button->setType("button");
159         m_button->setValue(fileButtonChooseFileLabel());
160         RefPtr<RenderStyle> buttonStyle = createButtonStyle(style());
161         RenderObject* renderer = m_button->createRenderer(renderArena(), buttonStyle.get());
162         m_button->setRenderer(renderer);
163         renderer->setStyle(buttonStyle.release());
164         renderer->updateFromElement();
165         m_button->setAttached();
166         m_button->setInDocument();
167
168         addChild(renderer);
169     }
170
171     m_button->setDisabled(!theme()->isEnabled(this));
172
173     // This only supports clearing out the files, but that's OK because for
174     // security reasons that's the only change the DOM is allowed to make.
175     FileList* files = inputElement->files();
176     ASSERT(files);
177     if (files && files->isEmpty() && !m_fileChooser->filenames().isEmpty()) {
178         m_fileChooser->clear();
179         repaint();
180     }
181 }
182
183 int RenderFileUploadControl::maxFilenameWidth() const
184 {
185     return max(0, contentWidth() - m_button->renderBox()->width() - afterButtonSpacing
186         - (m_fileChooser->icon() ? iconWidth + iconFilenameSpacing : 0));
187 }
188
189 PassRefPtr<RenderStyle> RenderFileUploadControl::createButtonStyle(const RenderStyle* parentStyle) const
190 {
191     RefPtr<RenderStyle> style = getCachedPseudoStyle(FILE_UPLOAD_BUTTON);
192     if (!style) {
193         style = RenderStyle::create();
194         if (parentStyle)
195             style->inheritFrom(parentStyle);
196     }
197
198     // Button text will wrap on file upload controls with widths smaller than the intrinsic button width
199     // without this setWhiteSpace.
200     style->setWhiteSpace(NOWRAP);
201
202     return style.release();
203 }
204
205 void RenderFileUploadControl::paintObject(PaintInfo& paintInfo, int tx, int ty)
206 {
207     if (style()->visibility() != VISIBLE)
208         return;
209     ASSERT(m_fileChooser);
210     
211     // Push a clip.
212     GraphicsContextStateSaver stateSaver(*paintInfo.context, false);
213     if (paintInfo.phase == PaintPhaseForeground || paintInfo.phase == PaintPhaseChildBlockBackgrounds) {
214         IntRect clipRect(tx + borderLeft(), ty + borderTop(),
215                          width() - borderLeft() - borderRight(), height() - borderBottom() - borderTop() + buttonShadowHeight);
216         if (clipRect.isEmpty())
217             return;
218         stateSaver.save();
219         paintInfo.context->clip(clipRect);
220     }
221
222     if (paintInfo.phase == PaintPhaseForeground) {
223         const String& displayedFilename = fileTextValue();
224         unsigned length = displayedFilename.length();
225         const UChar* string = displayedFilename.characters();
226         TextRun textRun(string, length, false, 0, 0, TextRun::AllowTrailingExpansion, !style()->isLeftToRightDirection(), style()->unicodeBidi() == Override);
227         
228         // Determine where the filename should be placed
229         int contentLeft = tx + borderLeft() + paddingLeft();
230         int buttonAndIconWidth = m_button->renderBox()->width() + afterButtonSpacing
231             + (m_fileChooser->icon() ? iconWidth + iconFilenameSpacing : 0);
232         int textX;
233         if (style()->isLeftToRightDirection())
234             textX = contentLeft + buttonAndIconWidth;
235         else
236             textX = contentLeft + contentWidth() - buttonAndIconWidth - style()->font().width(textRun);
237         // We want to match the button's baseline
238         RenderButton* buttonRenderer = toRenderButton(m_button->renderer());
239         int textY = buttonRenderer->absoluteBoundingBoxRect().y()
240             + buttonRenderer->marginTop() + buttonRenderer->borderTop() + buttonRenderer->paddingTop()
241             + buttonRenderer->baselinePosition(AlphabeticBaseline, true, HorizontalLine, PositionOnContainingLine);
242
243         paintInfo.context->setFillColor(style()->visitedDependentColor(CSSPropertyColor), style()->colorSpace());
244         
245         // Draw the filename
246         paintInfo.context->drawBidiText(style()->font(), textRun, IntPoint(textX, textY));
247         
248         if (m_fileChooser->icon()) {
249             // Determine where the icon should be placed
250             int iconY = ty + borderTop() + paddingTop() + (contentHeight() - iconHeight) / 2;
251             int iconX;
252             if (style()->isLeftToRightDirection())
253                 iconX = contentLeft + m_button->renderBox()->width() + afterButtonSpacing;
254             else
255                 iconX = contentLeft + contentWidth() - m_button->renderBox()->width() - afterButtonSpacing - iconWidth;
256
257             // Draw the file icon
258             m_fileChooser->icon()->paint(paintInfo.context, IntRect(iconX, iconY, iconWidth, iconHeight));
259         }
260     }
261
262     // Paint the children.
263     RenderBlock::paintObject(paintInfo, tx, ty);
264 }
265
266 void RenderFileUploadControl::computePreferredLogicalWidths()
267 {
268     ASSERT(preferredLogicalWidthsDirty());
269
270     m_minPreferredLogicalWidth = 0;
271     m_maxPreferredLogicalWidth = 0;
272
273     if (style()->width().isFixed() && style()->width().value() > 0)
274         m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth = computeContentBoxLogicalWidth(style()->width().value());
275     else {
276         // Figure out how big the filename space needs to be for a given number of characters
277         // (using "0" as the nominal character).
278         const UChar ch = '0';
279         float charWidth = style()->font().width(TextRun(&ch, 1, false, 0, 0, TextRun::AllowTrailingExpansion, false));
280         m_maxPreferredLogicalWidth = (int)ceilf(charWidth * defaultWidthNumChars);
281     }
282
283     if (style()->minWidth().isFixed() && style()->minWidth().value() > 0) {
284         m_maxPreferredLogicalWidth = max(m_maxPreferredLogicalWidth, computeContentBoxLogicalWidth(style()->minWidth().value()));
285         m_minPreferredLogicalWidth = max(m_minPreferredLogicalWidth, computeContentBoxLogicalWidth(style()->minWidth().value()));
286     } else if (style()->width().isPercent() || (style()->width().isAuto() && style()->height().isPercent()))
287         m_minPreferredLogicalWidth = 0;
288     else
289         m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth;
290
291     if (style()->maxWidth().isFixed() && style()->maxWidth().value() != undefinedLength) {
292         m_maxPreferredLogicalWidth = min(m_maxPreferredLogicalWidth, computeContentBoxLogicalWidth(style()->maxWidth().value()));
293         m_minPreferredLogicalWidth = min(m_minPreferredLogicalWidth, computeContentBoxLogicalWidth(style()->maxWidth().value()));
294     }
295
296     int toAdd = borderAndPaddingWidth();
297     m_minPreferredLogicalWidth += toAdd;
298     m_maxPreferredLogicalWidth += toAdd;
299
300     setPreferredLogicalWidthsDirty(false);
301 }
302
303 VisiblePosition RenderFileUploadControl::positionForPoint(const IntPoint&)
304 {
305     return VisiblePosition();
306 }
307
308 void RenderFileUploadControl::receiveDroppedFiles(const Vector<String>& paths)
309 {
310 #if ENABLE(DIRECTORY_UPLOAD)
311     if (allowsDirectoryUpload()) {
312         receiveDropForDirectoryUpload(paths);
313         return;
314     }
315 #endif
316
317     if (allowsMultipleFiles())
318         m_fileChooser->chooseFiles(paths);
319     else
320         m_fileChooser->chooseFile(paths[0]);
321 }
322
323 String RenderFileUploadControl::buttonValue()
324 {
325     if (!m_button)
326         return String();
327     
328     return m_button->value();
329 }
330
331 String RenderFileUploadControl::fileTextValue() const
332 {
333     return m_fileChooser->basenameForWidth(style()->font(), maxFilenameWidth());
334 }
335     
336 } // namespace WebCore