ui/views/controls/slide_out_view.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 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   ~SlideOutView() override;
  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   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   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_