WebCore/rendering/RenderFileUploadControl.cpp - WebKit - Git at Google

 /*
  * 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 "FrameView.h"
 #include "GraphicsContext.h"
 #include "HTMLInputElement.h"
 #include "HTMLNames.h"
 #include "Icon.h"
 #include "LocalizedStrings.h"
 #include "RenderButton.h"
 #include "RenderText.h"
 #include "RenderTheme.h"
 #include "RenderView.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;

 class HTMLFileUploadInnerButtonElement : public HTMLInputElement {
 public:
     HTMLFileUploadInnerButtonElement(Document*, Node* shadowParent);

     virtual bool isShadowNode() const { return true; }
     virtual Node* shadowParentNode() { return m_shadowParent; }

 private:
     Node* m_shadowParent;
 };

 RenderFileUploadControl::RenderFileUploadControl(HTMLInputElement* input)
     : RenderBlock(input)
     , m_button(0)
     , m_fileChooser(FileChooser::create(this, input->value()))
 {
 }

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

 void RenderFileUploadControl::setStyle(RenderStyle* newStyle)
 {
     // Force text-align to match the direction
     if (newStyle->direction() == LTR)
         newStyle->setTextAlign(LEFT);
     else
         newStyle->setTextAlign(RIGHT);

     RenderBlock::setStyle(newStyle);
     if (m_button)
         m_button->renderer()->setStyle(createButtonStyle(newStyle));

     setReplaced(isInline());
 }

 void RenderFileUploadControl::valueChanged()
 {
     // onChange may destroy this renderer
     RefPtr<FileChooser> fileChooser = m_fileChooser;

     HTMLInputElement* inputElement = static_cast<HTMLInputElement*>(node());
     inputElement->setValueFromRenderer(fileChooser->filename());
     inputElement->onChange();

     // only repaint if it doesn't seem we have been destroyed
     if (!fileChooser->disconnected())
         repaint();
 }

 void RenderFileUploadControl::click()
 {
      m_fileChooser->openFileChooser(node()->document());
 }

 void RenderFileUploadControl::updateFromElement()
 {
     HTMLInputElement* inputElement = static_cast<HTMLInputElement*>(node());

     if (!m_button) {
         m_button = new HTMLFileUploadInnerButtonElement(document(), inputElement);
         m_button->setInputType("button");
         m_button->setValue(fileButtonChooseFileLabel());
         RenderStyle* buttonStyle = createButtonStyle(style());
         RenderObject* renderer = m_button->createRenderer(renderArena(), buttonStyle);
         m_button->setRenderer(renderer);
         renderer->setStyle(buttonStyle);
         renderer->updateFromElement();
         m_button->setAttached();
         m_button->setInDocument(true);

         addChild(renderer);
     }

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

     // This only supports clearing out the filename, but that's OK because for
     // security reasons that's the only change the DOM is allowed to make.
     if (inputElement->value().isEmpty() && !m_fileChooser->filename().isEmpty()) {
         m_fileChooser->clear();
         repaint();
     }
 }

 int RenderFileUploadControl::maxFilenameWidth() const
 {
     return max(0, contentWidth() - m_button->renderer()->width() - afterButtonSpacing
         - (m_fileChooser->icon() ? iconWidth + iconFilenameSpacing : 0));
 }

 RenderStyle* RenderFileUploadControl::createButtonStyle(RenderStyle* parentStyle) const
 {
     RenderStyle* style = getPseudoStyle(RenderStyle::FILE_UPLOAD_BUTTON);
     if (!style) {
         style = new (renderArena()) RenderStyle;
         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;
 }

 void RenderFileUploadControl::paintObject(PaintInfo& paintInfo, int tx, int ty)
 {
     if (style()->visibility() != VISIBLE)
         return;

     // Push a clip.
     if (paintInfo.phase == PaintPhaseForeground || paintInfo.phase == PaintPhaseChildBlockBackgrounds) {
         IntRect clipRect(tx + borderLeft(), ty + borderTop(),
                          width() - borderLeft() - borderRight(), height() - borderBottom() - borderTop() + buttonShadowHeight);
         if (clipRect.isEmpty())
             return;
         paintInfo.context->save();
         paintInfo.context->clip(clipRect);
     }

     if (paintInfo.phase == PaintPhaseForeground) {
         const String& displayedFilename = m_fileChooser->basenameForWidth(style()->font(), maxFilenameWidth());
         unsigned length = displayedFilename.length();
         const UChar* string = displayedFilename.characters();
         TextRun textRun(string, length, false, 0, 0, style()->direction() == RTL, style()->unicodeBidi() == Override);

         // Determine where the filename should be placed
         int contentLeft = tx + borderLeft() + paddingLeft();
         int buttonAndIconWidth = m_button->renderer()->width() + afterButtonSpacing
             + (m_fileChooser->icon() ? iconWidth + iconFilenameSpacing : 0);
         int textX;
         if (style()->direction() == LTR)
             textX = contentLeft + buttonAndIconWidth;
         else
             textX = contentLeft + contentWidth() - buttonAndIconWidth - style()->font().width(textRun);
         // We want to match the button's baseline
         RenderButton* buttonRenderer = static_cast<RenderButton*>(m_button->renderer());
         int textY = buttonRenderer->absoluteBoundingBoxRect().y()
             + buttonRenderer->marginTop() + buttonRenderer->borderTop() + buttonRenderer->paddingTop()
             + buttonRenderer->baselinePosition(true, false);

         paintInfo.context->setFont(style()->font());
         paintInfo.context->setFillColor(style()->color());

         // Draw the filename
         paintInfo.context->drawBidiText(textRun, IntPoint(textX, textY));

         if (m_fileChooser->icon()) {
             // Determine where the icon should be placed
             int iconY = ty + borderTop() + paddingTop() + (contentHeight() - iconHeight) / 2;
             int iconX;
             if (style()->direction() == LTR)
                 iconX = contentLeft + m_button->renderer()->width() + afterButtonSpacing;
             else
                 iconX = contentLeft + contentWidth() - m_button->renderer()->width() - afterButtonSpacing - iconWidth;

             // Draw the file icon
             m_fileChooser->icon()->paint(paintInfo.context, IntRect(iconX, iconY, iconWidth, iconHeight));
         }
     }

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

     // Pop the clip.
     if (paintInfo.phase == PaintPhaseForeground || paintInfo.phase == PaintPhaseChildBlockBackgrounds)
         paintInfo.context->restore();
 }

 void RenderFileUploadControl::calcPrefWidths()
 {
     ASSERT(prefWidthsDirty());

     m_minPrefWidth = 0;
     m_maxPrefWidth = 0;

     if (style()->width().isFixed() && style()->width().value() > 0)
         m_minPrefWidth = m_maxPrefWidth = calcContentBoxWidth(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';
         float charWidth = style()->font().floatWidth(TextRun(&ch, 1, false, 0, 0, false, false, false));
         m_maxPrefWidth = (int)ceilf(charWidth * defaultWidthNumChars);
     }

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

     if (style()->maxWidth().isFixed() && style()->maxWidth().value() != undefinedLength) {
         m_maxPrefWidth = min(m_maxPrefWidth, calcContentBoxWidth(style()->maxWidth().value()));
         m_minPrefWidth = min(m_minPrefWidth, calcContentBoxWidth(style()->maxWidth().value()));
     }

     int toAdd = paddingLeft() + paddingRight() + borderLeft() + borderRight();
     m_minPrefWidth += toAdd;
     m_maxPrefWidth += toAdd;

     setPrefWidthsDirty(false);
 }

 void RenderFileUploadControl::receiveDroppedFile(const String& filename)
 {
     m_fileChooser->chooseFile(filename);
 }

 HTMLFileUploadInnerButtonElement::HTMLFileUploadInnerButtonElement(Document* doc, Node* shadowParent)
     : HTMLInputElement(doc)
     , m_shadowParent(shadowParent)
 {
 }

 } // namespace WebCore
	/*
	* 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 "FrameView.h"
	#include "GraphicsContext.h"
	#include "HTMLInputElement.h"
	#include "HTMLNames.h"
	#include "Icon.h"
	#include "LocalizedStrings.h"
	#include "RenderButton.h"
	#include "RenderText.h"
	#include "RenderTheme.h"
	#include "RenderView.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;

	class HTMLFileUploadInnerButtonElement : public HTMLInputElement {
	public:
	HTMLFileUploadInnerButtonElement(Document, Node shadowParent);

	virtual bool isShadowNode() const { return true; }
	virtual Node* shadowParentNode() { return m_shadowParent; }

	private:
	Node* m_shadowParent;
	};

	RenderFileUploadControl::RenderFileUploadControl(HTMLInputElement* input)
	: RenderBlock(input)
	, m_button(0)
	, m_fileChooser(FileChooser::create(this, input->value()))
	{
	}

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

	void RenderFileUploadControl::setStyle(RenderStyle* newStyle)
	{
	// Force text-align to match the direction
	if (newStyle->direction() == LTR)
	newStyle->setTextAlign(LEFT);
	else
	newStyle->setTextAlign(RIGHT);

	RenderBlock::setStyle(newStyle);
	if (m_button)
	m_button->renderer()->setStyle(createButtonStyle(newStyle));

	setReplaced(isInline());
	}

	void RenderFileUploadControl::valueChanged()
	{
	// onChange may destroy this renderer
	RefPtr<FileChooser> fileChooser = m_fileChooser;

	HTMLInputElement* inputElement = static_cast<HTMLInputElement*>(node());
	inputElement->setValueFromRenderer(fileChooser->filename());
	inputElement->onChange();

	// only repaint if it doesn't seem we have been destroyed
	if (!fileChooser->disconnected())
	repaint();
	}

	void RenderFileUploadControl::click()
	{
	m_fileChooser->openFileChooser(node()->document());
	}

	void RenderFileUploadControl::updateFromElement()
	{
	HTMLInputElement* inputElement = static_cast<HTMLInputElement*>(node());

	if (!m_button) {
	m_button = new HTMLFileUploadInnerButtonElement(document(), inputElement);
	m_button->setInputType("button");
	m_button->setValue(fileButtonChooseFileLabel());
	RenderStyle* buttonStyle = createButtonStyle(style());
	RenderObject* renderer = m_button->createRenderer(renderArena(), buttonStyle);
	m_button->setRenderer(renderer);
	renderer->setStyle(buttonStyle);
	renderer->updateFromElement();
	m_button->setAttached();
	m_button->setInDocument(true);

	addChild(renderer);
	}

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

	// This only supports clearing out the filename, but that's OK because for
	// security reasons that's the only change the DOM is allowed to make.
	if (inputElement->value().isEmpty() && !m_fileChooser->filename().isEmpty()) {
	m_fileChooser->clear();
	repaint();
	}
	}

	int RenderFileUploadControl::maxFilenameWidth() const
	{
	return max(0, contentWidth() - m_button->renderer()->width() - afterButtonSpacing
	- (m_fileChooser->icon() ? iconWidth + iconFilenameSpacing : 0));
	}

	RenderStyle* RenderFileUploadControl::createButtonStyle(RenderStyle* parentStyle) const
	{
	RenderStyle* style = getPseudoStyle(RenderStyle::FILE_UPLOAD_BUTTON);
	if (!style) {
	style = new (renderArena()) RenderStyle;
	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;
	}

	void RenderFileUploadControl::paintObject(PaintInfo& paintInfo, int tx, int ty)
	{
	if (style()->visibility() != VISIBLE)
	return;

	// Push a clip.
	if (paintInfo.phase == PaintPhaseForeground \|\| paintInfo.phase == PaintPhaseChildBlockBackgrounds) {
	IntRect clipRect(tx + borderLeft(), ty + borderTop(),
	width() - borderLeft() - borderRight(), height() - borderBottom() - borderTop() + buttonShadowHeight);
	if (clipRect.isEmpty())
	return;
	paintInfo.context->save();
	paintInfo.context->clip(clipRect);
	}

	if (paintInfo.phase == PaintPhaseForeground) {
	const String& displayedFilename = m_fileChooser->basenameForWidth(style()->font(), maxFilenameWidth());
	unsigned length = displayedFilename.length();
	const UChar* string = displayedFilename.characters();
	TextRun textRun(string, length, false, 0, 0, style()->direction() == RTL, style()->unicodeBidi() == Override);

	// Determine where the filename should be placed
	int contentLeft = tx + borderLeft() + paddingLeft();
	int buttonAndIconWidth = m_button->renderer()->width() + afterButtonSpacing
	+ (m_fileChooser->icon() ? iconWidth + iconFilenameSpacing : 0);
	int textX;
	if (style()->direction() == LTR)
	textX = contentLeft + buttonAndIconWidth;
	else
	textX = contentLeft + contentWidth() - buttonAndIconWidth - style()->font().width(textRun);
	// We want to match the button's baseline
	RenderButton* buttonRenderer = static_cast<RenderButton*>(m_button->renderer());
	int textY = buttonRenderer->absoluteBoundingBoxRect().y()
	+ buttonRenderer->marginTop() + buttonRenderer->borderTop() + buttonRenderer->paddingTop()
	+ buttonRenderer->baselinePosition(true, false);

	paintInfo.context->setFont(style()->font());
	paintInfo.context->setFillColor(style()->color());

	// Draw the filename
	paintInfo.context->drawBidiText(textRun, IntPoint(textX, textY));

	if (m_fileChooser->icon()) {
	// Determine where the icon should be placed
	int iconY = ty + borderTop() + paddingTop() + (contentHeight() - iconHeight) / 2;
	int iconX;
	if (style()->direction() == LTR)
	iconX = contentLeft + m_button->renderer()->width() + afterButtonSpacing;
	else
	iconX = contentLeft + contentWidth() - m_button->renderer()->width() - afterButtonSpacing - iconWidth;

	// Draw the file icon
	m_fileChooser->icon()->paint(paintInfo.context, IntRect(iconX, iconY, iconWidth, iconHeight));
	}
	}

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

	// Pop the clip.
	if (paintInfo.phase == PaintPhaseForeground \|\| paintInfo.phase == PaintPhaseChildBlockBackgrounds)
	paintInfo.context->restore();
	}

	void RenderFileUploadControl::calcPrefWidths()
	{
	ASSERT(prefWidthsDirty());

	m_minPrefWidth = 0;
	m_maxPrefWidth = 0;

	if (style()->width().isFixed() && style()->width().value() > 0)
	m_minPrefWidth = m_maxPrefWidth = calcContentBoxWidth(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';
	float charWidth = style()->font().floatWidth(TextRun(&ch, 1, false, 0, 0, false, false, false));
	m_maxPrefWidth = (int)ceilf(charWidth * defaultWidthNumChars);
	}

	if (style()->minWidth().isFixed() && style()->minWidth().value() > 0) {
	m_maxPrefWidth = max(m_maxPrefWidth, calcContentBoxWidth(style()->minWidth().value()));
	m_minPrefWidth = max(m_minPrefWidth, calcContentBoxWidth(style()->minWidth().value()));
	} else if (style()->width().isPercent() \|\| (style()->width().isAuto() && style()->height().isPercent()))
	m_minPrefWidth = 0;
	else
	m_minPrefWidth = m_maxPrefWidth;

	if (style()->maxWidth().isFixed() && style()->maxWidth().value() != undefinedLength) {
	m_maxPrefWidth = min(m_maxPrefWidth, calcContentBoxWidth(style()->maxWidth().value()));
	m_minPrefWidth = min(m_minPrefWidth, calcContentBoxWidth(style()->maxWidth().value()));
	}

	int toAdd = paddingLeft() + paddingRight() + borderLeft() + borderRight();
	m_minPrefWidth += toAdd;
	m_maxPrefWidth += toAdd;

	setPrefWidthsDirty(false);
	}

	void RenderFileUploadControl::receiveDroppedFile(const String& filename)
	{
	m_fileChooser->chooseFile(filename);
	}

	HTMLFileUploadInnerButtonElement::HTMLFileUploadInnerButtonElement(Document* doc, Node* shadowParent)
	: HTMLInputElement(doc)
	, m_shadowParent(shadowParent)
	{
	}

	} // namespace WebCore