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// Copyright 2015 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 UI_VIEWS_ANIMATION_INK_DROP_ANIMATION_OBSERVER_H_
#define UI_VIEWS_ANIMATION_INK_DROP_ANIMATION_OBSERVER_H_
#include <string>
#include "base/macros.h"
#include "ui/views/animation/ink_drop_state.h"
#include "ui/views/views_export.h"
namespace views {
// Pure-virtual base class of an observer that can be attached to
// InkDropAnimations.
class VIEWS_EXPORT InkDropAnimationObserver {
public:
// Enumeration of the different reasons why an InkDropAnimation has finished.
enum InkDropAnimationEndedReason {
// The animation was completed successfully.
SUCCESS,
// The animation was stopped prematurely before reaching its final state.
PRE_EMPTED
};
// Notifies the observer that an animation for |ink_drop_state| has started.
virtual void InkDropAnimationStarted(InkDropState ink_drop_state) = 0;
// Notifies the observer that an animation for |ink_drop_state| has finished
// and the reason for completion is given by |reason|. If |reason| is SUCCESS
// then the animation has progressed to its final frame however if |reason|
// is |PRE_EMPTED| then the animation was stopped before its final frame. In
// the event that an animation is in progress for ink drop state 's1' and an
// animation to a new state 's2' is triggered, then
// InkDropAnimationEnded(s1, PRE_EMPTED) will be called before
// InkDropAnimationStarted(s2).
virtual void InkDropAnimationEnded(InkDropState ink_drop_state,
InkDropAnimationEndedReason reason) = 0;
protected:
InkDropAnimationObserver() {}
virtual ~InkDropAnimationObserver() {}
private:
DISALLOW_COPY_AND_ASSIGN(InkDropAnimationObserver);
};
// Returns a human readable string for |reason|. Useful for logging.
std::string ToString(
InkDropAnimationObserver::InkDropAnimationEndedReason reason);
} // namespace views
#endif // UI_VIEWS_ANIMATION_INK_DROP_ANIMATION_OBSERVER_H_
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