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/*
* Copyright (C) 2011 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 INC. AND ITS CONTRIBUTORS ``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 INC. OR ITS 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 "ScriptedAnimationController.h"
#if ENABLE(REQUEST_ANIMATION_FRAME)
#include "Document.h"
#include "Element.h"
#include "FrameView.h"
#include "RequestAnimationFrameCallback.h"
namespace WebCore {
ScriptedAnimationController::ScriptedAnimationController(Document* document)
: m_document(document)
, m_nextCallbackId(0)
, m_suspendCount(0)
{
}
void ScriptedAnimationController::suspend()
{
++m_suspendCount;
}
void ScriptedAnimationController::resume()
{
--m_suspendCount;
if (!m_suspendCount && m_callbacks.size())
if (FrameView* fv = m_document->view())
fv->scheduleAnimation();
}
ScriptedAnimationController::CallbackId ScriptedAnimationController::registerCallback(PassRefPtr<RequestAnimationFrameCallback> callback, Element* animationElement)
{
ScriptedAnimationController::CallbackId id = m_nextCallbackId++;
callback->m_firedOrCancelled = false;
callback->m_id = id;
callback->m_element = animationElement;
m_callbacks.append(callback);
if (!m_suspendCount)
if (FrameView* view = m_document->view())
view->scheduleAnimation();
return id;
}
void ScriptedAnimationController::cancelCallback(CallbackId id)
{
for (size_t i = 0; i < m_callbacks.size(); ++i) {
if (m_callbacks[i]->m_id == id) {
m_callbacks[i]->m_firedOrCancelled = true;
m_callbacks.remove(i);
return;
}
}
}
void ScriptedAnimationController::serviceScriptedAnimations(DOMTimeStamp time)
{
if (!m_callbacks.size() || m_suspendCount)
return;
// We want to run the callback for all elements in the document that have registered
// for a callback and that are visible. Running the callbacks can cause new callbacks
// to be registered, existing callbacks to be cancelled, and elements to gain or lose
// visibility so this code has to iterate carefully.
// FIXME: Currently, this code doesn't do any visibility tests beyond checking display:
// First, generate a list of callbacks to consider. Callbacks registered from this point
// on are considered only for the "next" frame, not this one.
CallbackList callbacks(m_callbacks);
// Firing the callback may cause the visibility of other elements to change. To avoid
// missing any callbacks, we keep iterating through the list of candiate callbacks and firing
// them until nothing new becomes visible.
bool firedCallback;
do {
firedCallback = false;
// A previous iteration may have invalidated style (or layout). Update styles for each iteration
// for now since all we check is the existence of a renderer.
m_document->updateStyleIfNeeded();
for (size_t i = 0; i < callbacks.size(); ++i) {
RequestAnimationFrameCallback* callback = callbacks[i].get();
if (!callback->m_firedOrCancelled && (!callback->m_element || callback->m_element->renderer())) {
callback->m_firedOrCancelled = true;
callback->handleEvent(time);
firedCallback = true;
callbacks.remove(i);
break;
}
}
} while (firedCallback);
// Remove any callbacks we fired from the list of pending callbacks.
for (size_t i = 0; i < m_callbacks.size();) {
if (m_callbacks[i]->m_firedOrCancelled)
m_callbacks.remove(i);
else
++i;
}
if (m_callbacks.size())
if (FrameView* view = m_document->view())
view->scheduleAnimation();
}
}
#endif
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