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      1 // Copyright (c) 2012 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 ASH_WM_GESTURES_LONG_PRESS_AFFORDANCE_HANDLER_H_
      6 #define ASH_WM_GESTURES_LONG_PRESS_AFFORDANCE_HANDLER_H_
      7 
      8 #include "base/timer/timer.h"
      9 #include "ui/base/animation/animation_delegate.h"
     10 #include "ui/base/animation/linear_animation.h"
     11 #include "ui/gfx/point.h"
     12 
     13 namespace aura {
     14 class Window;
     15 }
     16 
     17 namespace ui {
     18 class LocatedEvent;
     19 }
     20 
     21 namespace ash {
     22 
     23 namespace test {
     24 class SystemGestureEventFilterTest;
     25 }
     26 
     27 namespace internal {
     28 
     29 // LongPressAffordanceHandler displays an animated affordance that is shown
     30 // on a TAP_DOWN gesture. The animation sequence consists of two parts:
     31 // The first part is a grow animation that starts at semi-long-press and
     32 // completes on a long-press gesture. The affordance animates to full size
     33 // during grow animation.
     34 // The second part is a shrink animation that start after grow and shrinks the
     35 // affordance out of view.
     36 class LongPressAffordanceHandler : public ui::AnimationDelegate,
     37                                    public ui::LinearAnimation {
     38  public:
     39   LongPressAffordanceHandler();
     40   virtual ~LongPressAffordanceHandler();
     41 
     42   // Display or removes long press affordance according to the |event|.
     43   void ProcessEvent(aura::Window* target,
     44                     ui::LocatedEvent* event,
     45                     int touch_id);
     46 
     47  private:
     48   friend class ash::test::SystemGestureEventFilterTest;
     49 
     50   enum LongPressAnimationType {
     51     NONE,
     52     GROW_ANIMATION,
     53     SHRINK_ANIMATION,
     54   };
     55 
     56   void StartAnimation();
     57   void StopAnimation();
     58 
     59   // Overridden from ui::LinearAnimation.
     60   virtual void AnimateToState(double state) OVERRIDE;
     61   virtual bool ShouldSendCanceledFromStop() OVERRIDE;
     62 
     63   // Overridden from ui::AnimationDelegate.
     64   virtual void AnimationEnded(const ui::Animation* animation) OVERRIDE;
     65 
     66   class LongPressAffordanceView;
     67   scoped_ptr<LongPressAffordanceView> view_;
     68   gfx::Point tap_down_location_;
     69   int tap_down_touch_id_;
     70   base::OneShotTimer<LongPressAffordanceHandler> timer_;
     71   int64 tap_down_display_id_;
     72   LongPressAnimationType current_animation_type_;
     73 
     74   DISALLOW_COPY_AND_ASSIGN(LongPressAffordanceHandler);
     75 };
     76 
     77 }  // namespace internal
     78 }  // namespace ash
     79 
     80 #endif  // ASH_WM_GESTURES_LONG_PRESS_AFFORDANCE_HANDLER_H_
     81