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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 UI_VIEWS_CONTROLS_SLIDE_OUT_VIEW_H_
      6 #define UI_VIEWS_CONTROLS_SLIDE_OUT_VIEW_H_
      7 
      8 #include "ui/compositor/layer_animation_observer.h"
      9 #include "ui/views/view.h"
     10 #include "ui/views/views_export.h"
     11 
     12 namespace views {
     13 
     14 // A View that can be closed by a slide-out touch gesture.
     15 class VIEWS_EXPORT SlideOutView : public views::View,
     16                                   public ui::ImplicitAnimationObserver {
     17  public:
     18   SlideOutView();
     19   virtual ~SlideOutView();
     20 
     21  protected:
     22   // Called when user intends to close the View by sliding it out.
     23   virtual void OnSlideOut() = 0;
     24 
     25   // Overridden from views::View.
     26   virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
     27 
     28  private:
     29   enum SlideDirection {
     30     SLIDE_LEFT,
     31     SLIDE_RIGHT,
     32   };
     33 
     34   // Restores the transform and opacity of the view.
     35   void RestoreVisualState();
     36 
     37   // Slides the view out and closes it after the animation.
     38   void SlideOutAndClose(SlideDirection direction);
     39 
     40   // Overridden from ImplicitAnimationObserver.
     41   virtual void OnImplicitAnimationsCompleted() OVERRIDE;
     42 
     43   float gesture_scroll_amount_;
     44 
     45   DISALLOW_COPY_AND_ASSIGN(SlideOutView);
     46 };
     47 
     48 }  // namespace views
     49 
     50 #endif  // UI_VIEWS_CONTROLS_SLIDE_OUT_VIEW_H_
     51