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Diffstat (limited to 'Source/WebCore/html/ImageDocument.cpp')
-rw-r--r-- | Source/WebCore/html/ImageDocument.cpp | 420 |
1 files changed, 420 insertions, 0 deletions
diff --git a/Source/WebCore/html/ImageDocument.cpp b/Source/WebCore/html/ImageDocument.cpp new file mode 100644 index 0000000..a42ccc8 --- /dev/null +++ b/Source/WebCore/html/ImageDocument.cpp @@ -0,0 +1,420 @@ +/* + * 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 "ImageDocument.h" + +#include "CachedImage.h" +#include "DocumentLoader.h" +#include "EventListener.h" +#include "EventNames.h" +#include "Frame.h" +#include "FrameLoaderClient.h" +#include "FrameView.h" +#include "HTMLHtmlElement.h" +#include "HTMLImageElement.h" +#include "HTMLNames.h" +#include "LocalizedStrings.h" +#include "MouseEvent.h" +#include "NotImplemented.h" +#include "Page.h" +#include "RawDataDocumentParser.h" +#include "Settings.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(ScriptExecutionContext*, Event*); + + ImageDocument* m_doc; +}; + +class ImageDocumentParser : public RawDataDocumentParser { +public: + static PassRefPtr<ImageDocumentParser> create(ImageDocument* document) + { + return adoptRef(new ImageDocumentParser(document)); + } + + ImageDocument* document() const + { + return static_cast<ImageDocument*>(RawDataDocumentParser::document()); + } + +private: + ImageDocumentParser(ImageDocument* document) + : RawDataDocumentParser(document) + { + } + + virtual void appendBytes(DocumentWriter*, const char*, int, bool); + virtual void finish(); +}; + +class ImageDocumentElement : public HTMLImageElement { +public: + static PassRefPtr<ImageDocumentElement> create(ImageDocument*); + +private: + ImageDocumentElement(ImageDocument* document) + : HTMLImageElement(imgTag, document) + , m_imageDocument(document) + { + } + + virtual ~ImageDocumentElement(); + virtual void willMoveToNewOwnerDocument(); + + ImageDocument* m_imageDocument; +}; + +inline PassRefPtr<ImageDocumentElement> ImageDocumentElement::create(ImageDocument* document) +{ + return adoptRef(new ImageDocumentElement(document)); +} + +// -------- + +static float pageZoomFactor(const Document* document) +{ + Frame* frame = document->frame(); + return frame ? frame->pageZoomFactor() : 1; +} + +void ImageDocumentParser::appendBytes(DocumentWriter*, const char*, int, bool) +{ + Frame* frame = document()->frame(); + Settings* settings = frame->settings(); + if (!frame->loader()->client()->allowImages(!settings || settings->areImagesEnabled())) + return; + + CachedImage* cachedImage = document()->cachedImage(); + cachedImage->data(frame->loader()->documentLoader()->mainResourceData(), false); + + document()->imageChanged(); +} + +void ImageDocumentParser::finish() +{ + if (!isStopped() && document()->imageElement()) { + CachedImage* cachedImage = document()->cachedImage(); + RefPtr<SharedBuffer> data = document()->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 (document()->frame()->loader()->documentLoader()->isLoadingMultipartContent()) + data = data->copy(); + + cachedImage->data(data.release(), true); + cachedImage->finish(); + + cachedImage->setResponse(document()->frame()->loader()->documentLoader()->response()); + + // Report the natural image size in the page title, regardless of zoom + // level. + IntSize size = cachedImage->imageSize(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()->imageChanged(); + } + + document()->finishedParsing(); +} + +// -------- + +ImageDocument::ImageDocument(Frame* frame, const KURL& url) + : HTMLDocument(frame, url) + , 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() +{ + ExceptionCode ec; + + RefPtr<Element> rootElement = Document::createElement(htmlTag, false); + appendChild(rootElement, ec); +#if ENABLE(OFFLINE_WEB_APPLICATIONS) + static_cast<HTMLHtmlElement*>(rootElement.get())->insertedByParser(); +#endif + + if (frame() && frame()->loader()) + frame()->loader()->dispatchDocumentElementAvailable(); + + RefPtr<Element> body = Document::createElement(bodyTag, false); + body->setAttribute(styleAttr, "margin: 0px;"); + + rootElement->appendChild(body, ec); + + RefPtr<ImageDocumentElement> imageElement = ImageDocumentElement::create(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); + if (DOMWindow* domWindow = this->domWindow()) + domWindow->addEventListener("resize", listener, false); + imageElement->addEventListener("click", listener.release(), false); + } + + m_imageElement = imageElement.get(); +} + +float ImageDocument::scale() const +{ + if (!m_imageElement) + return 1.0f; + + FrameView* view = frame()->view(); + if (!view) + return 1; + + IntSize imageSize = m_imageElement->cachedImage()->imageSize(pageZoomFactor(this)); + IntSize windowSize = IntSize(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) + return; + + IntSize imageSize = m_imageElement->cachedImage()->imageSize(pageZoomFactor(this)); + + 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(pageZoomFactor(this)).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(pageZoomFactor(this)).width()); + m_imageElement->setHeight(m_imageElement->cachedImage()->imageSize(pageZoomFactor(this)).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; + + FrameView* view = frame()->view(); + if (!view) + return true; + + IntSize imageSize = m_imageElement->cachedImage()->imageSize(pageZoomFactor(this)); + IntSize windowSize = IntSize(view->width(), 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(ScriptExecutionContext*, Event* event) +{ + if (event->type() == eventNames().resizeEvent) + m_doc->windowSizeChanged(); + else if (event->type() == eventNames().clickEvent && event->isMouseEvent()) { + MouseEvent* mouseEvent = static_cast<MouseEvent*>(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; +} + +// -------- + +ImageDocumentElement::~ImageDocumentElement() +{ + if (m_imageDocument) + m_imageDocument->disconnectImageElement(); +} + +void ImageDocumentElement::willMoveToNewOwnerDocument() +{ + if (m_imageDocument) { + m_imageDocument->disconnectImageElement(); + m_imageDocument = 0; + } + HTMLImageElement::willMoveToNewOwnerDocument(); +} + +} |