ash/wm/gestures/long_press_affordance_handler.h

   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/aura/window_observer.h"
  10 #include "ui/gfx/animation/linear_animation.h"
  11 #include "ui/gfx/point.h"
  12
  13 namespace ui {
  14 class GestureEvent;
  15 }
  16
  17 namespace ash {
  18
  19 namespace test {
  20 class SystemGestureEventFilterTest;
  21 }
  22
  23 // LongPressAffordanceHandler displays an animated affordance that is shown
  24 // on a TAP_DOWN gesture. The animation sequence consists of two parts:
  25 // The first part is a grow animation that starts at semi-long-press and
  26 // completes on a long-press gesture. The affordance animates to full size
  27 // during grow animation.
  28 // The second part is a shrink animation that start after grow and shrinks the
  29 // affordance out of view.
  30 class LongPressAffordanceHandler : public gfx::LinearAnimation,
  31                                    public aura::WindowObserver {
  32  public:
  33   LongPressAffordanceHandler();
  34   virtual ~LongPressAffordanceHandler();
  35
  36   // Displays or removes long press affordance according to the |event|.
  37   void ProcessEvent(aura::Window* target, ui::GestureEvent* event);
  38
  39  private:
  40   friend class ash::test::SystemGestureEventFilterTest;
  41
  42   class LongPressAffordanceView;
  43
  44   enum LongPressAnimationType {
  45     NONE,
  46     GROW_ANIMATION,
  47     SHRINK_ANIMATION,
  48   };
  49
  50   void StartAnimation();
  51   void StopAffordance();
  52   void SetTapDownTarget(aura::Window* target);
  53
  54   // Overridden from gfx::LinearAnimation.
  55   virtual void AnimateToState(double state) override;
  56   virtual void AnimationStopped() override;
  57
  58   // Overridden from aura::WindowObserver.
  59   virtual void OnWindowDestroying(aura::Window* window) override;
  60
  61   scoped_ptr<LongPressAffordanceView> view_;
  62   gfx::Point tap_down_location_;
  63   base::OneShotTimer<LongPressAffordanceHandler> timer_;
  64   aura::Window* tap_down_target_;
  65   LongPressAnimationType current_animation_type_;
  66
  67   DISALLOW_COPY_AND_ASSIGN(LongPressAffordanceHandler);
  68 };
  69
  70 }  // namespace ash
  71
  72 #endif  // ASH_WM_GESTURES_LONG_PRESS_AFFORDANCE_HANDLER_H_