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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_MEDIA_CONTROLS_ELEMENTS_MEDIA_CONTROL_ANIMATION_EVENT_LISTENER_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_MEDIA_CONTROLS_ELEMENTS_MEDIA_CONTROL_ANIMATION_EVENT_LISTENER_H_
#include "third_party/blink/renderer/core/dom/events/native_event_listener.h"
#include "third_party/blink/renderer/modules/modules_export.h"
namespace blink {
class Element;
class ExecutionContext;
class Event;
// Listens for animationend and animationiteration DOM events on a HTML element
// provided by the loading panel. When the events are called it calls the
// OnAnimation* methods on the loading panel.
//
// This exists because we need to know when the animation ends so we can reset
// the element and we also need to keep track of how many iterations the
// animation has gone through so we can nicely stop the animation at the end of
// the current one.
class MODULES_EXPORT MediaControlAnimationEventListener final
: public NativeEventListener {
public:
// To use this class you need to use Observer as a mixin and return an element
// to watch. You then instanitate a MediaControlAnimationEventListener from
// the class pointing to your observer. The listener will call the On*
// functions when events are triggered.
class MODULES_EXPORT Observer : public GarbageCollectedMixin {
public:
// The watched element has completed an iteration of an animation.
virtual void OnAnimationIteration() = 0;
// The watched element has finished all iterations of an animation.
virtual void OnAnimationEnd() = 0;
// This is the element to watch for animation events.
virtual Element& WatchedAnimationElement() const = 0;
void Trace(blink::Visitor*) override;
};
explicit MediaControlAnimationEventListener(Observer*);
void Detach();
void Trace(Visitor*) override;
void Invoke(ExecutionContext*, Event*) override;
private:
Member<Observer> observer_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_MEDIA_CONTROLS_ELEMENTS_MEDIA_CONTROL_ANIMATION_EVENT_LISTENER_H_
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