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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 CONTENT_BROWSER_RENDERER_HOST_OVERSCROLL_CONTROLLER_DELEGATE_H_
      6 #define CONTENT_BROWSER_RENDERER_HOST_OVERSCROLL_CONTROLLER_DELEGATE_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/compiler_specific.h"
     10 #include "content/browser/renderer_host/overscroll_controller.h"
     11 
     12 namespace content {
     13 
     14 // The delegate receives overscroll gesture updates from the controller and
     15 // should perform appropriate actions.
     16 class OverscrollControllerDelegate {
     17  public:
     18   OverscrollControllerDelegate() {}
     19   virtual ~OverscrollControllerDelegate() {}
     20 
     21   // This is called for each update in the overscroll amount.
     22   virtual void OnOverscrollUpdate(float delta_x, float delta_y) = 0;
     23 
     24   // This is called when the overscroll completes.
     25   virtual void OnOverscrollComplete(OverscrollMode overscroll_mode) = 0;
     26 
     27   // This is called when the direction of the overscroll changes.
     28   virtual void OnOverscrollModeChange(OverscrollMode old_mode,
     29                                       OverscrollMode new_mode) = 0;
     30 
     31  private:
     32   DISALLOW_COPY_AND_ASSIGN(OverscrollControllerDelegate);
     33 };
     34 
     35 }  // namespace content
     36 
     37 #endif  // CONTENT_BROWSER_RENDERER_HOST_OVERSCROLL_CONTROLLER_DELEGATE_H_
     38