chrome/browser/ui/views/frame/scroll_end_effect_controller.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 CHROME_BROWSER_UI_VIEWS_FRAME_SCROLL_END_EFFECT_CONTROLLER_H_
   6 #define CHROME_BROWSER_UI_VIEWS_FRAME_SCROLL_END_EFFECT_CONTROLLER_H_
   7
   8 #include "base/basictypes.h"
   9
  10 // The controller receives the raw y-deltas generated by the overscroll
  11 // controller and is resonsible for converting them in to the scroll end
  12 // effect. This effect occurs in the vertical overscroll case and is used to
  13 // visually indicate to the user that they have reached the end of the content
  14 // that they are scrolling.
  15 class ScrollEndEffectController {
  16  public:
  17   ScrollEndEffectController() {}
  18   virtual ~ScrollEndEffectController() {}
  19
  20   static ScrollEndEffectController* Create();
  21
  22   // Interface that allows vertical overscroll activies to be communicated to
  23   // the controller.
  24   virtual void OverscrollUpdate(int delta_y) = 0;
  25
  26  private:
  27   DISALLOW_COPY_AND_ASSIGN(ScrollEndEffectController);
  28 };
  29
  30 #endif  // CHROME_BROWSER_UI_VIEWS_FRAME_SCROLL_END_EFFECT_CONTROLLER_H_