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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_layers_AsyncPanZoomAnimation_h_
#define mozilla_layers_AsyncPanZoomAnimation_h_
#include "base/message_loop.h"
#include "mozilla/RefPtr.h"
#include "mozilla/TimeStamp.h"
#include "FrameMetrics.h"
#include "nsISupportsImpl.h"
#include "nsTArray.h"
namespace mozilla {
namespace layers {
class WheelScrollAnimation;
class SmoothScrollAnimation;
class AsyncPanZoomAnimation {
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(AsyncPanZoomAnimation)
public:
explicit AsyncPanZoomAnimation()
{ }
virtual bool DoSample(FrameMetrics& aFrameMetrics,
const TimeDuration& aDelta) = 0;
bool Sample(FrameMetrics& aFrameMetrics,
const TimeDuration& aDelta) {
// In some situations, particularly when handoff is involved, it's possible
// for |aDelta| to be negative on the first call to sample. Ignore such a
// sample here, to avoid each derived class having to deal with this case.
if (aDelta.ToMilliseconds() <= 0) {
return true;
}
return DoSample(aFrameMetrics, aDelta);
}
/**
* Get the deferred tasks in |mDeferredTasks| and place them in |aTasks|. See
* |mDeferredTasks| for more information. Clears |mDeferredTasks|.
*/
nsTArray<RefPtr<Runnable>> TakeDeferredTasks() {
return Move(mDeferredTasks);
}
virtual WheelScrollAnimation* AsWheelScrollAnimation() {
return nullptr;
}
virtual SmoothScrollAnimation* AsSmoothScrollAnimation() {
return nullptr;
}
virtual bool WantsRepaints() {
return true;
}
protected:
// Protected destructor, to discourage deletion outside of Release():
virtual ~AsyncPanZoomAnimation()
{ }
/**
* Tasks scheduled for execution after the APZC's mMonitor is released.
* Derived classes can add tasks here in Sample(), and the APZC can call
* ExecuteDeferredTasks() to execute them.
*/
nsTArray<RefPtr<Runnable>> mDeferredTasks;
};
} // namespace layers
} // namespace mozilla
#endif // mozilla_layers_AsyncPanZoomAnimation_h_
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