Notify <picture> elements when a media query (potentially) changes

Source/core/html/HTMLSourceElement.cpp

 /*
  * Copyright (C) 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,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * 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/HTMLSourceElement.h"
 
 #include "core/HTMLNames.h"
+#include "core/css/MediaList.h"
+#include "core/css/MediaQueryList.h"
+#include "core/css/MediaQueryMatcher.h"
+#include "core/dom/Document.h"
 #include "core/events/Event.h"
 #include "core/events/EventSender.h"
 #include "core/html/HTMLMediaElement.h"
 #include "core/html/HTMLPictureElement.h"
 #include "platform/Logging.h"
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
 static SourceEventSender& sourceErrorEventSender()
 {
     DEFINE_STATIC_LOCAL(SourceEventSender, sharedErrorEventSender, (EventTypeNames::error));
     return sharedErrorEventSender;
 }
 
 inline HTMLSourceElement::HTMLSourceElement(Document& document)
     : HTMLElement(sourceTag, document)
+    , m_listener(adoptRefWillBeNoop(new Listener(this)))
 {
     WTF_LOG(Media, "HTMLSourceElement::HTMLSourceElement - %p", this);
     ScriptWrappable::init(this);
 }
 
 DEFINE_NODE_FACTORY(HTMLSourceElement)
 
 HTMLSourceElement::~HTMLSourceElement()
 {
     sourceErrorEventSender().cancelEvent(this);
+    m_listener->clearElement();
 }
 
 Node::InsertionNotificationRequest HTMLSourceElement::insertedInto(ContainerNode* insertionPoint)
 {
     HTMLElement::insertedInto(insertionPoint);
     Element* parent = parentElement();
     if (isHTMLMediaElement(parent))
         toHTMLMediaElement(parent)->sourceWasAdded(this);
     if (isHTMLPictureElement(parent))
         toHTMLPictureElement(parent)->sourceOrMediaChanged();
@@ skipping 39 matching lines @@
     sourceErrorEventSender().cancelEvent(this);
 }
 
 void HTMLSourceElement::dispatchPendingEvent(SourceEventSender* eventSender)
 {
     ASSERT_UNUSED(eventSender, eventSender == &sourceErrorEventSender());
     WTF_LOG(Media, "HTMLSourceElement::dispatchPendingEvent - %p", this);
     dispatchEvent(Event::createCancelable(EventTypeNames::error));
 }
 
+bool HTMLSourceElement::mediaQueryMatches() const
+{
+    if (!m_mediaQueryList)
+        return true;
+
+    return m_mediaQueryList->matches();
+}
+
 bool HTMLSourceElement::isURLAttribute(const Attribute& attribute) const
 {
     return attribute.name() == srcAttr || HTMLElement::isURLAttribute(attribute);
 }
 
 void HTMLSourceElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
 {
     HTMLElement::parseAttribute(name, value);
+    if (name == mediaAttr) {
+        if (m_mediaQueryList)
+            m_mediaQueryList->removeListener(m_listener);
+        RefPtrWillBeRawPtr<MediaQuerySet> set = MediaQuerySet::create(value);
+        m_mediaQueryList = MediaQueryList::create(&document().mediaQueryMatcher(), set.release());
+        m_mediaQueryList->addListener(m_listener);
+    }
     if (name == srcsetAttr || name == sizesAttr || name == mediaAttr || name == typeAttr) {
         Element* parent = parentElement();
         if (isHTMLPictureElement(parent))
             toHTMLPictureElement(parent)->sourceOrMediaChanged();
     }
 }
 
+void HTMLSourceElement::notifyMediaQueryChanged()
+{
+    Element* parent = parentElement();
+    if (isHTMLPictureElement(parent))
+        toHTMLPictureElement(parent)->sourceOrMediaChanged();
 }
+
+}