cc/input/top_controls_manager.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CC_INPUT_TOP_CONTROLS_MANAGER_H_
   6 #define CC_INPUT_TOP_CONTROLS_MANAGER_H_
   7
   8 #include "base/memory/scoped_ptr.h"
   9 #include "base/memory/weak_ptr.h"
  10 #include "cc/input/top_controls_state.h"
  11 #include "cc/layers/layer_impl.h"
  12 #include "ui/gfx/geometry/size.h"
  13 #include "ui/gfx/geometry/vector2d_f.h"
  14
  15 namespace base {
  16 class TimeTicks;
  17 }
  18
  19 namespace cc {
  20
  21 class KeyframedFloatAnimationCurve;
  22 class LayerTreeImpl;
  23 class TopControlsManagerClient;
  24
  25 // Manages the position of the top controls.
  26 class CC_EXPORT TopControlsManager
  27     : public base::SupportsWeakPtr<TopControlsManager> {
  28  public:
  29   enum AnimationDirection {
  30     NO_ANIMATION,
  31     SHOWING_CONTROLS,
  32     HIDING_CONTROLS
  33   };
  34
  35   static scoped_ptr<TopControlsManager> Create(
  36       TopControlsManagerClient* client,
  37       float top_controls_show_threshold,
  38       float top_controls_hide_threshold);
  39   virtual ~TopControlsManager();
  40
  41   float ControlsTopOffset();
  42   float ContentTopOffset();
  43
  44   KeyframedFloatAnimationCurve* animation() {
  45     return top_controls_animation_.get();
  46   }
  47   AnimationDirection animation_direction() { return animation_direction_; }
  48
  49   void UpdateTopControlsState(TopControlsState constraints,
  50                               TopControlsState current,
  51                               bool animate);
  52
  53   void ScrollBegin();
  54   gfx::Vector2dF ScrollBy(const gfx::Vector2dF& pending_delta);
  55   void ScrollEnd();
  56
  57   // The caller should ensure that |Pinch{Begin,End}| are called within
  58   // the scope of |Scroll{Begin,End}|.
  59   void PinchBegin();
  60   void PinchEnd();
  61
  62   gfx::Vector2dF Animate(base::TimeTicks monotonic_time);
  63   void SetControlsTopOffset(float offset);
  64   void SetTopControlsHeight(float top_controls_height);
  65   float top_controls_height() { return top_controls_height_; }
  66
  67  protected:
  68   TopControlsManager(TopControlsManagerClient* client,
  69                      float top_controls_show_threshold,
  70                      float top_controls_hide_threshold);
  71
  72  private:
  73   void ResetAnimations();
  74   void SetupAnimation(AnimationDirection direction);
  75   void StartAnimationIfNecessary();
  76   bool IsAnimationCompleteAtTime(base::TimeTicks time);
  77
  78   TopControlsManagerClient* client_;  // The client manages the lifecycle of
  79                                       // this.
  80
  81   scoped_ptr<KeyframedFloatAnimationCurve> top_controls_animation_;
  82   AnimationDirection animation_direction_;
  83   TopControlsState permitted_state_;
  84   float top_controls_height_;
  85
  86   float current_scroll_delta_;
  87   float controls_scroll_begin_offset_;
  88
  89   // The percent height of the visible top control such that it must be shown
  90   // when the user stops the scroll.
  91   float top_controls_show_threshold_;
  92
  93   // The percent height of the visible top control such that it must be hidden
  94   // when the user stops the scroll.
  95   float top_controls_hide_threshold_;
  96
  97   bool pinch_gesture_active_;
  98
  99   DISALLOW_COPY_AND_ASSIGN(TopControlsManager);
 100 };
 101
 102 }  // namespace cc
 103
 104 #endif  // CC_INPUT_TOP_CONTROLS_MANAGER_H_