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/*
* Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "ImageDocument.h"
#include "CachedImage.h"
#include "DocumentLoader.h"
#include "Element.h"
#include "EventListener.h"
#include "EventNames.h"
#include "Frame.h"
#include "FrameLoader.h"
#include "FrameView.h"
#include "HTMLImageElement.h"
#include "HTMLNames.h"
#include "LocalizedStrings.h"
#include "MouseEvent.h"
#include "Page.h"
#include "SegmentedString.h"
#include "Settings.h"
#include "Text.h"
#include "XMLTokenizer.h"
using std::min;
namespace WebCore {
using namespace HTMLNames;
class ImageEventListener : public EventListener {
public:
static PassRefPtr<ImageEventListener> create(ImageDocument* document) { return adoptRef(new ImageEventListener(document)); }
virtual void handleEvent(Event*, bool isWindowEvent);
private:
ImageEventListener(ImageDocument* document) : m_doc(document) { }
ImageDocument* m_doc;
};
class ImageTokenizer : public Tokenizer {
public:
ImageTokenizer(ImageDocument* doc) : m_doc(doc) {}
virtual void write(const SegmentedString&, bool appendData);
virtual void finish();
virtual bool isWaitingForScripts() const;
virtual bool wantsRawData() const { return true; }
virtual bool writeRawData(const char* data, int len);
private:
ImageDocument* m_doc;
};
class ImageDocumentElement : public HTMLImageElement {
public:
ImageDocumentElement(ImageDocument* doc)
: HTMLImageElement(imgTag, doc)
, m_imageDocument(doc)
{
}
virtual ~ImageDocumentElement();
virtual void willMoveToNewOwnerDocument();
private:
ImageDocument* m_imageDocument;
};
// --------
void ImageTokenizer::write(const SegmentedString&, bool)
{
ASSERT_NOT_REACHED();
}
bool ImageTokenizer::writeRawData(const char*, int)
{
CachedImage* cachedImage = m_doc->cachedImage();
cachedImage->data(m_doc->frame()->loader()->documentLoader()->mainResourceData(), false);
m_doc->imageChanged();
return false;
}
void ImageTokenizer::finish()
{
if (!m_parserStopped && m_doc->imageElement()) {
CachedImage* cachedImage = m_doc->cachedImage();
RefPtr<SharedBuffer> data = m_doc->frame()->loader()->documentLoader()->mainResourceData();
// If this is a multipart image, make a copy of the current part, since the resource data
// will be overwritten by the next part.
if (m_doc->frame()->loader()->documentLoader()->isLoadingMultipartContent())
data = data->copy();
cachedImage->data(data.release(), true);
cachedImage->finish();
cachedImage->setResponse(m_doc->frame()->loader()->documentLoader()->response());
IntSize size = cachedImage->imageSize(m_doc->frame()->pageZoomFactor());
if (size.width()) {
// Compute the title, we use the filename of the resource, falling
// back on the hostname if there is no path.
String fileName = m_doc->url().lastPathComponent();
if (fileName.isEmpty())
fileName = m_doc->url().host();
m_doc->setTitle(imageTitle(fileName, size));
}
m_doc->imageChanged();
}
m_doc->finishedParsing();
}
bool ImageTokenizer::isWaitingForScripts() const
{
// An image document is never waiting for scripts
return false;
}
// --------
ImageDocument::ImageDocument(Frame* frame)
: HTMLDocument(frame)
, m_imageElement(0)
, m_imageSizeIsKnown(false)
, m_didShrinkImage(false)
, m_shouldShrinkImage(shouldShrinkToFit())
{
setParseMode(Compat);
}
Tokenizer* ImageDocument::createTokenizer()
{
return new ImageTokenizer(this);
}
void ImageDocument::createDocumentStructure()
{
ExceptionCode ec;
RefPtr<Element> rootElement = Document::createElement(htmlTag, false);
appendChild(rootElement, ec);
RefPtr<Element> body = Document::createElement(bodyTag, false);
body->setAttribute(styleAttr, "margin: 0px;");
rootElement->appendChild(body, ec);
RefPtr<ImageDocumentElement> imageElement = new ImageDocumentElement(this);
imageElement->setAttribute(styleAttr, "-webkit-user-select: none");
imageElement->setLoadManually(true);
imageElement->setSrc(url().string());
body->appendChild(imageElement, ec);
if (shouldShrinkToFit()) {
// Add event listeners
RefPtr<EventListener> listener = ImageEventListener::create(this);
addWindowEventListener("resize", listener, false);
imageElement->addEventListener("click", listener.release(), false);
}
m_imageElement = imageElement.get();
}
float ImageDocument::scale() const
{
if (!m_imageElement)
return 1.0f;
IntSize imageSize = m_imageElement->cachedImage()->imageSize(frame()->pageZoomFactor());
IntSize windowSize = IntSize(frame()->view()->width(), frame()->view()->height());
float widthScale = (float)windowSize.width() / imageSize.width();
float heightScale = (float)windowSize.height() / imageSize.height();
return min(widthScale, heightScale);
}
void ImageDocument::resizeImageToFit()
{
if (!m_imageElement)
return;
IntSize imageSize = m_imageElement->cachedImage()->imageSize(frame()->pageZoomFactor());
float scale = this->scale();
m_imageElement->setWidth(static_cast<int>(imageSize.width() * scale));
m_imageElement->setHeight(static_cast<int>(imageSize.height() * scale));
ExceptionCode ec;
m_imageElement->style()->setProperty("cursor", "-webkit-zoom-in", ec);
}
void ImageDocument::imageClicked(int x, int y)
{
if (!m_imageSizeIsKnown || imageFitsInWindow())
return;
m_shouldShrinkImage = !m_shouldShrinkImage;
if (m_shouldShrinkImage)
windowSizeChanged();
else {
restoreImageSize();
updateLayout();
float scale = this->scale();
int scrollX = static_cast<int>(x / scale - (float)frame()->view()->width() / 2);
int scrollY = static_cast<int>(y / scale - (float)frame()->view()->height() / 2);
frame()->view()->setScrollPosition(IntPoint(scrollX, scrollY));
}
}
void ImageDocument::imageChanged()
{
ASSERT(m_imageElement);
if (m_imageSizeIsKnown)
return;
if (m_imageElement->cachedImage()->imageSize(frame()->pageZoomFactor()).isEmpty())
return;
m_imageSizeIsKnown = true;
if (shouldShrinkToFit()) {
// Force resizing of the image
windowSizeChanged();
}
}
void ImageDocument::restoreImageSize()
{
if (!m_imageElement || !m_imageSizeIsKnown)
return;
m_imageElement->setWidth(m_imageElement->cachedImage()->imageSize(frame()->pageZoomFactor()).width());
m_imageElement->setHeight(m_imageElement->cachedImage()->imageSize(frame()->pageZoomFactor()).height());
ExceptionCode ec;
if (imageFitsInWindow())
m_imageElement->style()->removeProperty("cursor", ec);
else
m_imageElement->style()->setProperty("cursor", "-webkit-zoom-out", ec);
m_didShrinkImage = false;
}
bool ImageDocument::imageFitsInWindow() const
{
if (!m_imageElement)
return true;
IntSize imageSize = m_imageElement->cachedImage()->imageSize(frame()->pageZoomFactor());
IntSize windowSize = IntSize(frame()->view()->width(), frame()->view()->height());
return imageSize.width() <= windowSize.width() && imageSize.height() <= windowSize.height();
}
void ImageDocument::windowSizeChanged()
{
if (!m_imageElement || !m_imageSizeIsKnown)
return;
bool fitsInWindow = imageFitsInWindow();
// If the image has been explicitly zoomed in, restore the cursor if the image fits
// and set it to a zoom out cursor if the image doesn't fit
if (!m_shouldShrinkImage) {
ExceptionCode ec;
if (fitsInWindow)
m_imageElement->style()->removeProperty("cursor", ec);
else
m_imageElement->style()->setProperty("cursor", "-webkit-zoom-out", ec);
return;
}
if (m_didShrinkImage) {
// If the window has been resized so that the image fits, restore the image size
// otherwise update the restored image size.
if (fitsInWindow)
restoreImageSize();
else
resizeImageToFit();
} else {
// If the image isn't resized but needs to be, then resize it.
if (!fitsInWindow) {
resizeImageToFit();
m_didShrinkImage = true;
}
}
}
CachedImage* ImageDocument::cachedImage()
{
if (!m_imageElement)
createDocumentStructure();
return m_imageElement->cachedImage();
}
bool ImageDocument::shouldShrinkToFit() const
{
return frame()->page()->settings()->shrinksStandaloneImagesToFit() &&
frame()->page()->mainFrame() == frame();
}
// --------
void ImageEventListener::handleEvent(Event* event, bool)
{
if (event->type() == eventNames().resizeEvent)
m_doc->windowSizeChanged();
else if (event->type() == eventNames().clickEvent) {
MouseEvent* mouseEvent = static_cast<MouseEvent*>(event);
m_doc->imageClicked(mouseEvent->x(), mouseEvent->y());
}
}
// --------
ImageDocumentElement::~ImageDocumentElement()
{
if (m_imageDocument)
m_imageDocument->disconnectImageElement();
}
void ImageDocumentElement::willMoveToNewOwnerDocument()
{
if (m_imageDocument) {
m_imageDocument->disconnectImageElement();
m_imageDocument = 0;
}
HTMLImageElement::willMoveToNewOwnerDocument();
}
}
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