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// Copyright (c) 2013 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 CHROME_BROWSER_UI_TABS_TAB_AUDIO_INDICATOR_H_
#define CHROME_BROWSER_UI_TABS_TAB_AUDIO_INDICATOR_H_
#include <vector>
#include "base/compiler_specific.h"
#include "base/gtest_prod_util.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "ui/base/animation/animation_delegate.h"
namespace gfx {
class Canvas;
class Rect;
}
namespace ui {
class Animation;
class AnimationContainer;
class LinearAnimation;
}
// This class is used to draw an animating tab audio indicator.
class TabAudioIndicator : public ui::AnimationDelegate {
public:
class Delegate {
public:
virtual void ScheduleAudioIndicatorPaint() = 0;
protected:
virtual ~Delegate() {}
};
explicit TabAudioIndicator(Delegate* delegate);
virtual ~TabAudioIndicator();
void SetAnimationContainer(ui::AnimationContainer* animation_container);
void SetIsPlayingAudio(bool is_playing_audio);
bool IsAnimating();
void Paint(gfx::Canvas* canvas, const gfx::Rect& rect);
private:
enum State {
STATE_NOT_ANIMATING,
STATE_ANIMATING,
STATE_ANIMATION_ENDING,
};
FRIEND_TEST_ALL_PREFIXES(TabAudioIndicatorTest, AnimationState);
FRIEND_TEST_ALL_PREFIXES(TabAudioIndicatorTest, SchedulePaint);
// AnimationDelegate:
virtual void AnimationProgressed(const ui::Animation* animation) OVERRIDE;
virtual void AnimationEnded(const ui::Animation* animation) OVERRIDE;
// Gets the equalizer levels for all 3 columns. The values are tweened between
// the current and target frame.
std::vector<int> GetCurrentEqualizerLevels() const;
Delegate* delegate_;
scoped_ptr<ui::LinearAnimation> animation_;
scoped_refptr<ui::AnimationContainer> animation_container_;
// The equalizer frame that's currently being displayed.
size_t frame_index_;
// The equalizer levels that were last displayed. This is used to prevent
// unnecessary drawing when animation progress doesn't result in equalizer
// levels changing.
std::vector<int> last_displayed_equalizer_levels_;
State state_;
DISALLOW_COPY_AND_ASSIGN(TabAudioIndicator);
};
#endif // CHROME_BROWSER_UI_TABS_TAB_AUDIO_INDICATOR_H_
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