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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_INPUT_TOP_CONTROLS_MANAGER_H_
#define CC_INPUT_TOP_CONTROLS_MANAGER_H_
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "cc/input/top_controls_state.h"
#include "cc/layers/layer_impl.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/geometry/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_show_threshold,
float top_controls_hide_threshold);
virtual ~TopControlsManager();
float ControlsTopOffset() const;
float ContentTopOffset() const;
float TopControlsShownRatio() const;
float TopControlsHeight() const;
bool has_animation() const { return top_controls_animation_; }
AnimationDirection animation_direction() { return animation_direction_; }
void UpdateTopControlsState(TopControlsState constraints,
TopControlsState current,
bool animate);
void ScrollBegin();
gfx::Vector2dF ScrollBy(const gfx::Vector2dF& pending_delta);
void ScrollEnd();
// The caller should ensure that |Pinch{Begin,End}| are called within
// the scope of |Scroll{Begin,End}|.
void PinchBegin();
void PinchEnd();
void MainThreadHasStoppedFlinging();
gfx::Vector2dF Animate(base::TimeTicks monotonic_time);
protected:
TopControlsManager(TopControlsManagerClient* client,
float top_controls_show_threshold,
float top_controls_hide_threshold);
private:
void ResetAnimations();
void SetupAnimation(AnimationDirection direction);
void StartAnimationIfNecessary();
bool IsAnimationComplete(float new_ratio);
void ResetBaseline();
TopControlsManagerClient* client_; // The client manages the lifecycle of
// this.
scoped_ptr<KeyframedFloatAnimationCurve> top_controls_animation_;
AnimationDirection animation_direction_;
TopControlsState permitted_state_;
// Accumulated scroll delta since last baseline reset
float accumulated_scroll_delta_;
// Content offset when last baseline reset occurred
float baseline_content_offset_;
// The percent height of the visible top control such that it must be shown
// when the user stops the scroll.
float top_controls_show_threshold_;
// The percent height of the visible top control such that it must be hidden
// when the user stops the scroll.
float top_controls_hide_threshold_;
bool pinch_gesture_active_;
DISALLOW_COPY_AND_ASSIGN(TopControlsManager);
};
} // namespace cc
#endif // CC_INPUT_TOP_CONTROLS_MANAGER_H_