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// Copyright 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 CC_TOP_CONTROLS_MANAGER_H_
#define CC_TOP_CONTROLS_MANAGER_H_
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "cc/layer_impl.h"
#include "ui/gfx/size.h"
#include "ui/gfx/vector2d_f.h"
namespace base {
class TimeTicks;
}
namespace cc {
class KeyframedFloatAnimationCurve;
class LayerTreeImpl;
class TopControlsManagerClient;
// Manages the position of the top controls.
class CC_EXPORT TopControlsManager
: public base::SupportsWeakPtr<TopControlsManager> {
public:
enum AnimationDirection {
NO_ANIMATION,
SHOWING_CONTROLS,
HIDING_CONTROLS
};
static scoped_ptr<TopControlsManager> Create(
TopControlsManagerClient* client,
float top_controls_height,
float top_controls_show_threshold,
float top_controls_hide_threshold);
virtual ~TopControlsManager();
float controls_top_offset() { return controls_top_offset_; }
float content_top_offset() { return content_top_offset_; }
KeyframedFloatAnimationCurve* animation() {
return top_controls_animation_.get();
}
AnimationDirection animation_direction() { return animation_direction_; }
void EnableHidingTopControls(bool enable);
void ScrollBegin();
gfx::Vector2dF ScrollBy(const gfx::Vector2dF pending_delta);
void ScrollEnd();
void Animate(base::TimeTicks monotonic_time);
protected:
TopControlsManager(TopControlsManagerClient* client,
float top_controls_height,
float top_controls_show_threshold,
float top_controls_hide_threshold);
private:
gfx::Vector2dF ScrollInternal(const gfx::Vector2dF pending_delta);
void ResetAnimations();
float RootScrollLayerTotalScrollY();
void SetupAnimation(AnimationDirection direction);
void StartAnimationIfNecessary();
bool IsAnimationCompleteAtTime(base::TimeTicks time);
TopControlsManagerClient* client_; // The client manages the lifecycle of
// this.
scoped_ptr<KeyframedFloatAnimationCurve> top_controls_animation_;
AnimationDirection animation_direction_;
bool enable_hiding_;
bool in_scroll_gesture_;
float controls_top_offset_;
float content_top_offset_;
float top_controls_height_;
float previous_root_scroll_offset_;
float scroll_start_offset_;
float current_scroll_delta_;
// The height of the visible top control such that it must be shown when
// the user stops the scroll.
float top_controls_show_height_;
// The height of the visible top control such that it must be hidden when
// the user stops the scroll.
float top_controls_hide_height_;
DISALLOW_COPY_AND_ASSIGN(TopControlsManager);
};
} // namespace cc
#endif // CC_TOP_CONTROLS_MANAGER_H_
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