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// Copyright (c) 2012 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 ASH_SHELF_BACKGROUND_ANIMATOR_H_
#define ASH_SHELF_BACKGROUND_ANIMATOR_H_
#include "ash/ash_export.h"
#include "base/basictypes.h"
#include "ui/gfx/animation/animation_delegate.h"
#include "ui/gfx/animation/slide_animation.h"
namespace ash {
// How the background can be changed.
enum BackgroundAnimatorChangeType {
BACKGROUND_CHANGE_ANIMATE,
BACKGROUND_CHANGE_IMMEDIATE
};
// Delegate is notified any time the background changes.
class ASH_EXPORT BackgroundAnimatorDelegate {
public:
virtual void UpdateBackground(int alpha) = 0;
protected:
virtual ~BackgroundAnimatorDelegate() {}
};
// BackgroundAnimator is used by the shelf to animate the background (alpha).
class ASH_EXPORT BackgroundAnimator : public gfx::AnimationDelegate {
public:
BackgroundAnimator(BackgroundAnimatorDelegate* delegate,
int min_alpha,
int max_alpha);
virtual ~BackgroundAnimator();
// Sets the transition time in ms.
void SetDuration(int time_in_ms);
// Sets whether a background is rendered. Initial value is false. If |type|
// is |CHANGE_IMMEDIATE| and an animation is not in progress this notifies
// the delegate immediately (synchronously from this method).
void SetPaintsBackground(bool value, BackgroundAnimatorChangeType type);
bool paints_background() const { return paints_background_; }
// Current alpha.
int alpha() const { return alpha_; }
// gfx::AnimationDelegate overrides:
virtual void AnimationProgressed(const gfx::Animation* animation) override;
private:
BackgroundAnimatorDelegate* delegate_;
const int min_alpha_;
const int max_alpha_;
gfx::SlideAnimation animation_;
// Whether the background is painted.
bool paints_background_;
// Current alpha value of the background.
int alpha_;
DISALLOW_COPY_AND_ASSIGN(BackgroundAnimator);
};
} // namespace ash
#endif // ASH_SHELF_BACKGROUND_ANIMATOR_H_
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