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      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_
     31