content/browser/renderer_host/overscroll_controller_delegate.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 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_