Imported WebKit commit 2ea9d364d0f6efa8fa64acf19f451504c59be0e4 (http://svn.webkit.org/repository/webkit/trunk@104285)

1 files changed, 158 insertions, 0 deletions

diff --git a/Source/WebCore/dom/DocumentEventQueue.cpp b/Source/WebCore/dom/DocumentEventQueue.cpp
new file mode 100644
index 000000000..31023e28d
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+++ b/Source/WebCore/dom/DocumentEventQueue.cpp
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+/*
+ * Copyright (C) 2010 Google 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 "DocumentEventQueue.h"
+
+#include "DOMWindow.h"
+#include "Document.h"
+#include "Event.h"
+#include "EventNames.h"
+#include "RuntimeApplicationChecks.h"
+#include "ScriptExecutionContext.h"
+#include "SuspendableTimer.h"
+
+namespace WebCore {
+    
+static inline bool shouldDispatchScrollEventSynchronously(Document* document)
+{
+    ASSERT_ARG(document, document);
+    return applicationIsSafari() && (document->url().protocolIs("feed") || document->url().protocolIs("feeds"));
+}
+
+class DocumentEventQueueTimer : public SuspendableTimer {
+    WTF_MAKE_NONCOPYABLE(DocumentEventQueueTimer);
+public:
+    DocumentEventQueueTimer(DocumentEventQueue* eventQueue, ScriptExecutionContext* context)
+        : SuspendableTimer(context)
+        , m_eventQueue(eventQueue) { }
+
+private:
+    virtual void fired() { m_eventQueue->pendingEventTimerFired(); }
+    DocumentEventQueue* m_eventQueue;
+};
+
+PassRefPtr<DocumentEventQueue> DocumentEventQueue::create(ScriptExecutionContext* context)
+{
+    return adoptRef(new DocumentEventQueue(context));
+}
+
+DocumentEventQueue::DocumentEventQueue(ScriptExecutionContext* context)
+    : m_pendingEventTimer(adoptPtr(new DocumentEventQueueTimer(this, context)))
+    , m_isClosed(false)
+{
+}
+
+DocumentEventQueue::~DocumentEventQueue()
+{
+}
+
+bool DocumentEventQueue::enqueueEvent(PassRefPtr<Event> event)
+{
+    if (m_isClosed)
+        return false;
+
+    ASSERT(event->target());
+    bool wasAdded = m_queuedEvents.add(event).second;
+    ASSERT_UNUSED(wasAdded, wasAdded); // It should not have already been in the list.
+    
+    if (!m_pendingEventTimer->isActive())
+        m_pendingEventTimer->startOneShot(0);
+
+    return true;
+}
+
+void DocumentEventQueue::enqueueOrDispatchScrollEvent(PassRefPtr<Node> target, ScrollEventTargetType targetType)
+{
+    if (!target->document()->hasListenerType(Document::SCROLL_LISTENER))
+        return;
+
+    // Per the W3C CSSOM View Module, scroll events fired at the document should bubble, others should not.
+    bool canBubble = targetType == ScrollEventDocumentTarget;
+    RefPtr<Event> scrollEvent = Event::create(eventNames().scrollEvent, canBubble, false /* non cancelleable */);
+     
+    if (shouldDispatchScrollEventSynchronously(target->document())) {
+        target->dispatchEvent(scrollEvent.release());
+        return;
+    }
+
+    if (!m_nodesWithQueuedScrollEvents.add(target.get()).second)
+        return;
+
+    scrollEvent->setTarget(target);
+    enqueueEvent(scrollEvent.release());
+}
+
+bool DocumentEventQueue::cancelEvent(Event* event)
+{
+    bool found = m_queuedEvents.contains(event);
+    m_queuedEvents.remove(event);
+    if (m_queuedEvents.isEmpty())
+        m_pendingEventTimer->stop();
+    return found;
+}
+
+void DocumentEventQueue::close()
+{
+    m_isClosed = true;
+    m_pendingEventTimer->stop();
+    m_queuedEvents.clear();
+}
+
+void DocumentEventQueue::pendingEventTimerFired()
+{
+    ASSERT(!m_pendingEventTimer->isActive());
+    ASSERT(!m_queuedEvents.isEmpty());
+
+    m_nodesWithQueuedScrollEvents.clear();
+
+    // Insert a marker for where we should stop.
+    ASSERT(!m_queuedEvents.contains(0));
+    bool wasAdded = m_queuedEvents.add(0).second;
+    ASSERT_UNUSED(wasAdded, wasAdded); // It should not have already been in the list.
+
+    RefPtr<DocumentEventQueue> protector(this);
+
+    while (!m_queuedEvents.isEmpty()) {
+        ListHashSet<RefPtr<Event> >::iterator iter = m_queuedEvents.begin();
+        RefPtr<Event> event = *iter;
+        m_queuedEvents.remove(iter);
+        if (!event)
+            break;
+        dispatchEvent(event.get());
+    }
+}
+
+void DocumentEventQueue::dispatchEvent(PassRefPtr<Event> event)
+{
+    EventTarget* eventTarget = event->target();
+    if (eventTarget->toDOMWindow())
+        eventTarget->toDOMWindow()->dispatchEvent(event, 0);
+    else
+        eventTarget->dispatchEvent(event);
+}
+
+}