RenderFileUploadControl.cpp   [plain text]

/*
 * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#include "config.h"
#include "RenderFileUploadControl.h"

#include "Chrome.h"
#include "FileList.h"
#include "Frame.h"
#include "FrameView.h"
#include "GraphicsContext.h"
#include "HTMLInputElement.h"
#include "HTMLNames.h"
#include "ShadowElement.h"
#include "LocalizedStrings.h"
#include "Page.h"
#include "PaintInfo.h"
#include "RenderButton.h"
#include "RenderText.h"
#include "RenderTheme.h"
#include "RenderView.h"
#include "TextRun.h"
#include <math.h>

using namespace std;

namespace WebCore {

using namespace HTMLNames;

const int afterButtonSpacing = 4;
const int iconHeight = 16;
const int iconWidth = 16;
const int iconFilenameSpacing = 2;
const int defaultWidthNumChars = 34;
const int buttonShadowHeight = 2;

RenderFileUploadControl::RenderFileUploadControl(HTMLInputElement* input)
    : RenderBlock(input)
{
    FileList* list = input->files();
    Vector<String> filenames;
    unsigned length = list ? list->length() : 0;
    for (unsigned i = 0; i < length; ++i)
        filenames.append(list->item(i)->path());
}

RenderFileUploadControl::~RenderFileUploadControl()
{
    if (m_button)
        m_button->detach();
}

void RenderFileUploadControl::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
{
    RenderBlock::styleDidChange(diff, oldStyle);
    if (m_button)
        m_button->renderer()->setStyle(createButtonStyle(style()));
}

void RenderFileUploadControl::valueChanged()
{
    // dispatchFormControlChangeEvent may destroy this renderer

    HTMLInputElement* inputElement = static_cast<HTMLInputElement*>(node());
    inputElement->dispatchFormControlChangeEvent();
 
    // only repaint if it doesn't seem we have been destroyed
        repaint();
}

bool RenderFileUploadControl::allowsMultipleFiles()
{
#if ENABLE(DIRECTORY_UPLOAD)
    if (allowsDirectoryUpload())
      return true;
#endif

    HTMLInputElement* input = static_cast<HTMLInputElement*>(node());
    return input->fastHasAttribute(multipleAttr);
}

#if ENABLE(DIRECTORY_UPLOAD)
bool RenderFileUploadControl::allowsDirectoryUpload()
{
    HTMLInputElement* input = static_cast<HTMLInputElement*>(node());
    return input->fastHasAttribute(webkitdirectoryAttr);
}

void RenderFileUploadControl::receiveDropForDirectoryUpload(const Vector<String>& paths)
{
    if (Chrome* chromePointer = chrome())
        chromePointer->enumerateChosenDirectory(paths[0], m_fileChooser.get());
}
#endif

String RenderFileUploadControl::acceptTypes()
{
    return static_cast<HTMLInputElement*>(node())->accept();
}


void RenderFileUploadControl::click()
{
}

Chrome* RenderFileUploadControl::chrome() const
{
    Frame* frame = node()->document()->frame();
    if (!frame)
        return 0;
    Page* page = frame->page();
    if (!page)
        return 0;
    return page->chrome();
}

void RenderFileUploadControl::updateFromElement()
{
    HTMLInputElement* inputElement = static_cast<HTMLInputElement*>(node());
    ASSERT(inputElement->isFileUpload());
    
    if (!m_button) {
        m_button = ShadowInputElement::create(inputElement);
        m_button->setType("button");
        m_button->setValue(fileButtonChooseFileLabel());
        RefPtr<RenderStyle> buttonStyle = createButtonStyle(style());
        RenderObject* renderer = m_button->createRenderer(renderArena(), buttonStyle.get());
        m_button->setRenderer(renderer);
        renderer->setStyle(buttonStyle.release());
        renderer->updateFromElement();
        m_button->setAttached();
        m_button->setInDocument();

        addChild(renderer);
    }

    m_button->setDisabled(!theme()->isEnabled(this));

}

int RenderFileUploadControl::maxFilenameWidth() const
{
    return max(0, contentWidth() - m_button->renderBox()->width() - afterButtonSpacing);
}

PassRefPtr<RenderStyle> RenderFileUploadControl::createButtonStyle(const RenderStyle* parentStyle) const
{
    RefPtr<RenderStyle> style = getCachedPseudoStyle(FILE_UPLOAD_BUTTON);
    if (!style) {
        style = RenderStyle::create();
        if (parentStyle)
            style->inheritFrom(parentStyle);
    }

    // Button text will wrap on file upload controls with widths smaller than the intrinsic button width
    // without this setWhiteSpace.
    style->setWhiteSpace(NOWRAP);

    return style.release();
}

void RenderFileUploadControl::paintObject(PaintInfo& paintInfo, int tx, int ty)
{
    if (style()->visibility() != VISIBLE)
        return;
    
    // Push a clip.
    GraphicsContextStateSaver stateSaver(*paintInfo.context, false);

    // Paint the children.
    RenderBlock::paintObject(paintInfo, tx, ty);
}

void RenderFileUploadControl::computePreferredLogicalWidths()
{
    ASSERT(preferredLogicalWidthsDirty());

    m_minPreferredLogicalWidth = 0;
    m_maxPreferredLogicalWidth = 0;

    const Font& font = style()->font();
    if (style()->width().isFixed() && style()->width().value() > 0)
        m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth = computeContentBoxLogicalWidth(style()->width().value());
    else {
        // Figure out how big the filename space needs to be for a given number of characters
        // (using "0" as the nominal character).
        const UChar ch = '0';
        const String str = String(&ch, 1);
        float charWidth = font.width(TextRun(str, false, 0, 0, TextRun::AllowTrailingExpansion));
        m_maxPreferredLogicalWidth = (int)ceilf(charWidth * defaultWidthNumChars);
    }

    if (style()->minWidth().isFixed() && style()->minWidth().value() > 0) {
        m_maxPreferredLogicalWidth = max(m_maxPreferredLogicalWidth, computeContentBoxLogicalWidth(style()->minWidth().value()));
        m_minPreferredLogicalWidth = max(m_minPreferredLogicalWidth, computeContentBoxLogicalWidth(style()->minWidth().value()));
    } else if (style()->width().isPercent() || (style()->width().isAuto() && style()->height().isPercent()))
        m_minPreferredLogicalWidth = 0;
    else
        m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth;

    if (style()->maxWidth().isFixed() && style()->maxWidth().value() != undefinedLength) {
        m_maxPreferredLogicalWidth = min(m_maxPreferredLogicalWidth, computeContentBoxLogicalWidth(style()->maxWidth().value()));
        m_minPreferredLogicalWidth = min(m_minPreferredLogicalWidth, computeContentBoxLogicalWidth(style()->maxWidth().value()));
    }

    int toAdd = borderAndPaddingWidth();
    m_minPreferredLogicalWidth += toAdd;
    m_maxPreferredLogicalWidth += toAdd;

    setPreferredLogicalWidthsDirty(false);
}

VisiblePosition RenderFileUploadControl::positionForPoint(const IntPoint&)
{
    return VisiblePosition();
}


String RenderFileUploadControl::buttonValue()
{
    if (!m_button)
        return String();
    
    return m_button->value();
}

String RenderFileUploadControl::fileTextValue() const
{
    return "";
}
    
} // namespace WebCore