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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_LAUNCHER_BACKGROUND_ANIMATOR_H_
#define ASH_LAUNCHER_BACKGROUND_ANIMATOR_H_
#include "ash/ash_export.h"
#include "base/basictypes.h"
#include "ui/base/animation/animation_delegate.h"
#include "ui/base/animation/slide_animation.h"
namespace ash {
namespace internal {
// 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 launcher and system tray to animate the
// background (alpha).
class ASH_EXPORT BackgroundAnimator : public ui::AnimationDelegate {
public:
// How the background can be changed.
enum ChangeType {
CHANGE_ANIMATE,
CHANGE_IMMEDIATE
};
BackgroundAnimator(BackgroundAnimatorDelegate* delegate,
int min_alpha,
int max_alpha);
virtual ~BackgroundAnimator();
// 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, ChangeType type);
// Current alpha.
int alpha() const { return alpha_; }
// ui::AnimationDelegate overrides:
virtual void AnimationProgressed(const ui::Animation* animation) OVERRIDE;
private:
BackgroundAnimatorDelegate* delegate_;
const int min_alpha_;
const int max_alpha_;
ui::SlideAnimation animation_;
// Whether the background is painted.
bool paints_background_;
// Current alpha value of the background.
int alpha_;
DISALLOW_COPY_AND_ASSIGN(BackgroundAnimator);
};
} // namespace internal
} // namespace ash
#endif // ASH_LAUNCHER_BACKGROUND_ANIMATOR_H_
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