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      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     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 
    269 void 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 
    306 VisiblePosition RenderFileUploadControl::positionForPoint(const IntPoint&)
    307 {
    308     return VisiblePosition();
    309 }
    310 
    311 void 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 
    326 String RenderFileUploadControl::buttonValue()
    327 {
    328     if (!m_button)
    329         return String();
    330 
    331     return m_button->value();
    332 }
    333 
    334 String RenderFileUploadControl::fileTextValue() const
    335 {
    336     return m_fileChooser->basenameForWidth(style()->font(), maxFilenameWidth());
    337 }
    338 
    339 } // namespace WebCore
    340