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/*
* Copyright (C) 2006, 2007, 2008, 2010 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 "core/html/ImageDocument.h"
#include "HTMLNames.h"
#include "bindings/v8/ExceptionStatePlaceholder.h"
#include "core/dom/RawDataDocumentParser.h"
#include "core/events/EventListener.h"
#include "core/events/MouseEvent.h"
#include "core/events/ThreadLocalEventNames.h"
#include "core/fetch/ImageResource.h"
#include "core/html/HTMLBodyElement.h"
#include "core/html/HTMLHeadElement.h"
#include "core/html/HTMLHtmlElement.h"
#include "core/html/HTMLImageElement.h"
#include "core/html/HTMLMetaElement.h"
#include "core/loader/DocumentLoader.h"
#include "core/loader/FrameLoader.h"
#include "core/loader/FrameLoaderClient.h"
#include "core/frame/Frame.h"
#include "core/frame/FrameView.h"
#include "core/page/Page.h"
#include "core/page/Settings.h"
#include "wtf/text/StringBuilder.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)); }
static const ImageEventListener* cast(const EventListener* listener)
{
return listener->type() == ImageEventListenerType
? static_cast<const ImageEventListener*>(listener)
: 0;
}
virtual bool operator==(const EventListener& other);
private:
ImageEventListener(ImageDocument* document)
: EventListener(ImageEventListenerType)
, m_doc(document)
{
}
virtual void handleEvent(ExecutionContext*, Event*);
ImageDocument* m_doc;
};
class ImageDocumentParser : public RawDataDocumentParser {
public:
static PassRefPtr<ImageDocumentParser> create(ImageDocument* document)
{
return adoptRef(new ImageDocumentParser(document));
}
ImageDocument* document() const
{
return toImageDocument(RawDataDocumentParser::document());
}
private:
ImageDocumentParser(ImageDocument* document)
: RawDataDocumentParser(document)
{
}
virtual size_t appendBytes(const char*, size_t) OVERRIDE;
virtual void finish();
};
// --------
static float pageZoomFactor(const Document* document)
{
Frame* frame = document->frame();
return frame ? frame->pageZoomFactor() : 1;
}
static String imageTitle(const String& filename, const IntSize& size)
{
StringBuilder result;
result.append(filename);
result.append(" (");
// FIXME: Localize numbers. Safari/OSX shows localized numbers with group
// separaters. For example, "1,920x1,080".
result.append(String::number(size.width()));
result.append(static_cast<UChar>(0xD7)); // U+00D7 (multiplication sign)
result.append(String::number(size.height()));
result.append(')');
return result.toString();
}
size_t ImageDocumentParser::appendBytes(const char* data, size_t length)
{
if (!length)
return 0;
Frame* frame = document()->frame();
Settings* settings = frame->settings();
if (!frame->loader().client()->allowImage(!settings || settings->areImagesEnabled(), document()->url()))
return 0;
document()->cachedImage()->appendData(data, length);
document()->imageUpdated();
return 0;
}
void ImageDocumentParser::finish()
{
if (!isStopped() && document()->imageElement()) {
ImageResource* cachedImage = document()->cachedImage();
cachedImage->finish();
cachedImage->setResponse(document()->frame()->loader().documentLoader()->response());
// Report the natural image size in the page title, regardless of zoom level.
// At a zoom level of 1 the image is guaranteed to have an integer size.
IntSize size = flooredIntSize(cachedImage->imageSizeForRenderer(document()->imageElement()->renderer(), 1.0f));
if (size.width()) {
// Compute the title, we use the decoded filename of the resource, falling
// back on the (decoded) hostname if there is no path.
String fileName = decodeURLEscapeSequences(document()->url().lastPathComponent());
if (fileName.isEmpty())
fileName = document()->url().host();
document()->setTitle(imageTitle(fileName, size));
}
document()->imageUpdated();
}
document()->finishedParsing();
}
// --------
ImageDocument::ImageDocument(const DocumentInit& initializer)
: HTMLDocument(initializer, ImageDocumentClass)
, m_imageElement(0)
, m_imageSizeIsKnown(false)
, m_didShrinkImage(false)
, m_shouldShrinkImage(shouldShrinkToFit())
{
setCompatibilityMode(QuirksMode);
lockCompatibilityMode();
}
PassRefPtr<DocumentParser> ImageDocument::createParser()
{
return ImageDocumentParser::create(this);
}
void ImageDocument::createDocumentStructure()
{
RefPtr<HTMLHtmlElement> rootElement = HTMLHtmlElement::create(*this);
appendChild(rootElement);
rootElement->insertedByParser();
if (frame())
frame()->loader().dispatchDocumentElementAvailable();
RefPtr<HTMLHeadElement> head = HTMLHeadElement::create(*this);
RefPtr<HTMLMetaElement> meta = HTMLMetaElement::create(*this);
meta->setAttribute(nameAttr, "viewport");
meta->setAttribute(contentAttr, "width=device-width");
head->appendChild(meta);
RefPtr<HTMLBodyElement> body = HTMLBodyElement::create(*this);
body->setAttribute(styleAttr, "margin: 0px;");
m_imageElement = HTMLImageElement::create(*this);
m_imageElement->setAttribute(styleAttr, "-webkit-user-select: none");
m_imageElement->setLoadManually(true);
m_imageElement->setSrc(url().string());
body->appendChild(m_imageElement.get());
if (shouldShrinkToFit()) {
// Add event listeners
RefPtr<EventListener> listener = ImageEventListener::create(this);
if (DOMWindow* domWindow = this->domWindow())
domWindow->addEventListener("resize", listener, false);
m_imageElement->addEventListener("click", listener.release(), false);
}
rootElement->appendChild(head);
rootElement->appendChild(body);
}
float ImageDocument::scale() const
{
if (!m_imageElement || m_imageElement->document() != this)
return 1.0f;
FrameView* view = frame()->view();
if (!view)
return 1;
LayoutSize imageSize = m_imageElement->cachedImage()->imageSizeForRenderer(m_imageElement->renderer(), pageZoomFactor(this));
LayoutSize windowSize = LayoutSize(view->width(), 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 || m_imageElement->document() != this || pageZoomFactor(this) > 1)
return;
LayoutSize imageSize = m_imageElement->cachedImage()->imageSizeForRenderer(m_imageElement->renderer(), pageZoomFactor(this));
float scale = this->scale();
m_imageElement->setWidth(static_cast<int>(imageSize.width() * scale));
m_imageElement->setHeight(static_cast<int>(imageSize.height() * scale));
m_imageElement->setInlineStyleProperty(CSSPropertyCursor, CSSValueWebkitZoomIn);
}
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::imageUpdated()
{
ASSERT(m_imageElement);
if (m_imageSizeIsKnown)
return;
if (m_imageElement->cachedImage()->imageSizeForRenderer(m_imageElement->renderer(), pageZoomFactor(this)).isEmpty())
return;
m_imageSizeIsKnown = true;
if (shouldShrinkToFit()) {
// Force resizing of the image
windowSizeChanged();
}
}
void ImageDocument::restoreImageSize()
{
if (!m_imageElement || !m_imageSizeIsKnown || m_imageElement->document() != this || pageZoomFactor(this) < 1)
return;
LayoutSize imageSize = m_imageElement->cachedImage()->imageSizeForRenderer(m_imageElement->renderer(), 1.0f);
m_imageElement->setWidth(imageSize.width());
m_imageElement->setHeight(imageSize.height());
if (imageFitsInWindow())
m_imageElement->removeInlineStyleProperty(CSSPropertyCursor);
else
m_imageElement->setInlineStyleProperty(CSSPropertyCursor, CSSValueWebkitZoomOut);
m_didShrinkImage = false;
}
bool ImageDocument::imageFitsInWindow() const
{
if (!m_imageElement || m_imageElement->document() != this)
return true;
FrameView* view = frame()->view();
if (!view)
return true;
LayoutSize imageSize = m_imageElement->cachedImage()->imageSizeForRenderer(m_imageElement->renderer(), pageZoomFactor(this));
LayoutSize windowSize = LayoutSize(view->width(), view->height());
return imageSize.width() <= windowSize.width() && imageSize.height() <= windowSize.height();
}
void ImageDocument::windowSizeChanged()
{
if (!m_imageElement || !m_imageSizeIsKnown || m_imageElement->document() != this)
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) {
if (fitsInWindow)
m_imageElement->removeInlineStyleProperty(CSSPropertyCursor);
else
m_imageElement->setInlineStyleProperty(CSSPropertyCursor, CSSValueWebkitZoomOut);
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;
}
}
}
ImageResource* ImageDocument::cachedImage()
{
if (!m_imageElement)
createDocumentStructure();
return m_imageElement->cachedImage();
}
bool ImageDocument::shouldShrinkToFit() const
{
return frame()->settings()->shrinksStandaloneImagesToFit() && frame()->page()->mainFrame() == frame();
}
void ImageDocument::dispose()
{
m_imageElement = 0;
HTMLDocument::dispose();
}
// --------
void ImageEventListener::handleEvent(ExecutionContext*, Event* event)
{
if (event->type() == EventTypeNames::resize)
m_doc->windowSizeChanged();
else if (event->type() == EventTypeNames::click && event->isMouseEvent()) {
MouseEvent* mouseEvent = toMouseEvent(event);
m_doc->imageClicked(mouseEvent->x(), mouseEvent->y());
}
}
bool ImageEventListener::operator==(const EventListener& listener)
{
if (const ImageEventListener* imageEventListener = ImageEventListener::cast(&listener))
return m_doc == imageEventListener->m_doc;
return false;
}
}