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
43using namespace std;
44
45namespace WebCore {
46
47using namespace HTMLNames;
48
49const int afterButtonSpacing = 4;
50const int iconHeight = 16;
51const int iconWidth = 16;
52const int iconFilenameSpacing = 2;
53const int defaultWidthNumChars = 34;
54const int buttonShadowHeight = 2;
55
56RenderFileUploadControl::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
67RenderFileUploadControl::~RenderFileUploadControl()
68{
69    if (m_button)
70        m_button->detach();
71    m_fileChooser->disconnectClient();
72}
73
74void 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
81void 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
95bool 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)
107bool RenderFileUploadControl::allowsDirectoryUpload()
108{
109    HTMLInputElement* input = static_cast<HTMLInputElement*>(node());
110    return input->fastHasAttribute(webkitdirectoryAttr);
111}
112
113void RenderFileUploadControl::receiveDropForDirectoryUpload(const Vector<String>& paths)
114{
115    if (Chrome* chromePointer = chrome())
116        chromePointer->enumerateChosenDirectory(paths[0], m_fileChooser.get());
117}
118#endif
119
120String RenderFileUploadControl::acceptTypes()
121{
122    return static_cast<HTMLInputElement*>(node())->accept();
123}
124
125void RenderFileUploadControl::chooseIconForFiles(FileChooser* chooser, const Vector<String>& filenames)
126{
127    if (Chrome* chromePointer = chrome())
128        chromePointer->chooseIconForFiles(filenames, chooser);
129}
130
131void 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
140Chrome* 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
151void 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
183int RenderFileUploadControl::maxFilenameWidth() const
184{
185    return max(0, contentWidth() - m_button->renderBox()->width() - afterButtonSpacing
186        - (m_fileChooser->icon() ? iconWidth + iconFilenameSpacing : 0));
187}
188
189PassRefPtr<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
205void 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    if (paintInfo.phase == PaintPhaseForeground || paintInfo.phase == PaintPhaseChildBlockBackgrounds) {
213        IntRect clipRect(tx + borderLeft(), ty + borderTop(),
214                         width() - borderLeft() - borderRight(), height() - borderBottom() - borderTop() + buttonShadowHeight);
215        if (clipRect.isEmpty())
216            return;
217        paintInfo.context->save();
218        paintInfo.context->clip(clipRect);
219    }
220
221    if (paintInfo.phase == PaintPhaseForeground) {
222        const String& displayedFilename = fileTextValue();
223        unsigned length = displayedFilename.length();
224        const UChar* string = displayedFilename.characters();
225        TextRun textRun(string, length, false, 0, 0, TextRun::AllowTrailingExpansion, !style()->isLeftToRightDirection(), style()->unicodeBidi() == Override);
226
227        // Determine where the filename should be placed
228        int contentLeft = tx + borderLeft() + paddingLeft();
229        int buttonAndIconWidth = m_button->renderBox()->width() + afterButtonSpacing
230            + (m_fileChooser->icon() ? iconWidth + iconFilenameSpacing : 0);
231        int textX;
232        if (style()->isLeftToRightDirection())
233            textX = contentLeft + buttonAndIconWidth;
234        else
235            textX = contentLeft + contentWidth() - buttonAndIconWidth - style()->font().width(textRun);
236        // We want to match the button's baseline
237        RenderButton* buttonRenderer = toRenderButton(m_button->renderer());
238        int textY = buttonRenderer->absoluteBoundingBoxRect().y()
239            + buttonRenderer->marginTop() + buttonRenderer->borderTop() + buttonRenderer->paddingTop()
240            + buttonRenderer->baselinePosition(AlphabeticBaseline, true, HorizontalLine, PositionOnContainingLine);
241
242        paintInfo.context->setFillColor(style()->visitedDependentColor(CSSPropertyColor), style()->colorSpace());
243
244        // Draw the filename
245        paintInfo.context->drawBidiText(style()->font(), textRun, IntPoint(textX, textY));
246
247        if (m_fileChooser->icon()) {
248            // Determine where the icon should be placed
249            int iconY = ty + borderTop() + paddingTop() + (contentHeight() - iconHeight) / 2;
250            int iconX;
251            if (style()->isLeftToRightDirection())
252                iconX = contentLeft + m_button->renderBox()->width() + afterButtonSpacing;
253            else
254                iconX = contentLeft + contentWidth() - m_button->renderBox()->width() - afterButtonSpacing - iconWidth;
255
256            // Draw the file icon
257            m_fileChooser->icon()->paint(paintInfo.context, IntRect(iconX, iconY, iconWidth, iconHeight));
258        }
259    }
260
261    // Paint the children.
262    RenderBlock::paintObject(paintInfo, tx, ty);
263
264    // Pop the clip.
265    if (paintInfo.phase == PaintPhaseForeground || paintInfo.phase == PaintPhaseChildBlockBackgrounds)
266        paintInfo.context->restore();
267}
268
269void RenderFileUploadControl::computePreferredLogicalWidths()
270{
271    ASSERT(preferredLogicalWidthsDirty());
272
273    m_minPreferredLogicalWidth = 0;
274    m_maxPreferredLogicalWidth = 0;
275
276    if (style()->width().isFixed() && style()->width().value() > 0)
277        m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth = computeContentBoxLogicalWidth(style()->width().value());
278    else {
279        // Figure out how big the filename space needs to be for a given number of characters
280        // (using "0" as the nominal character).
281        const UChar ch = '0';
282        float charWidth = style()->font().width(TextRun(&ch, 1, false, 0, 0, TextRun::AllowTrailingExpansion, false));
283        m_maxPreferredLogicalWidth = (int)ceilf(charWidth * defaultWidthNumChars);
284    }
285
286    if (style()->minWidth().isFixed() && style()->minWidth().value() > 0) {
287        m_maxPreferredLogicalWidth = max(m_maxPreferredLogicalWidth, computeContentBoxLogicalWidth(style()->minWidth().value()));
288        m_minPreferredLogicalWidth = max(m_minPreferredLogicalWidth, computeContentBoxLogicalWidth(style()->minWidth().value()));
289    } else if (style()->width().isPercent() || (style()->width().isAuto() && style()->height().isPercent()))
290        m_minPreferredLogicalWidth = 0;
291    else
292        m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth;
293
294    if (style()->maxWidth().isFixed() && style()->maxWidth().value() != undefinedLength) {
295        m_maxPreferredLogicalWidth = min(m_maxPreferredLogicalWidth, computeContentBoxLogicalWidth(style()->maxWidth().value()));
296        m_minPreferredLogicalWidth = min(m_minPreferredLogicalWidth, computeContentBoxLogicalWidth(style()->maxWidth().value()));
297    }
298
299    int toAdd = borderAndPaddingWidth();
300    m_minPreferredLogicalWidth += toAdd;
301    m_maxPreferredLogicalWidth += toAdd;
302
303    setPreferredLogicalWidthsDirty(false);
304}
305
306VisiblePosition RenderFileUploadControl::positionForPoint(const IntPoint&)
307{
308    return VisiblePosition();
309}
310
311void RenderFileUploadControl::receiveDroppedFiles(const Vector<String>& paths)
312{
313#if ENABLE(DIRECTORY_UPLOAD)
314    if (allowsDirectoryUpload()) {
315        receiveDropForDirectoryUpload(paths);
316        return;
317    }
318#endif
319
320    if (allowsMultipleFiles())
321        m_fileChooser->chooseFiles(paths);
322    else
323        m_fileChooser->chooseFile(paths[0]);
324}
325
326String RenderFileUploadControl::buttonValue()
327{
328    if (!m_button)
329        return String();
330
331    return m_button->value();
332}
333
334String RenderFileUploadControl::fileTextValue() const
335{
336    return m_fileChooser->basenameForWidth(style()->font(), maxFilenameWidth());
337}
338
339} // namespace WebCore
340