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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 #include "ui/gfx/rect.h"
     12 
     13 namespace content {
     14 
     15 // The delegate receives overscroll gesture updates from the controller and
     16 // should perform appropriate actions.
     17 class OverscrollControllerDelegate {
     18  public:
     19   OverscrollControllerDelegate() {}
     20   virtual ~OverscrollControllerDelegate() {}
     21 
     22   // Get the bounds of the view corresponding to the delegate. Overscroll-ending
     23   // events will only be processed if the visible bounds are non-empty.
     24   virtual gfx::Rect GetVisibleBounds() const = 0;
     25 
     26   // This is called for each update in the overscroll amount. Returns true if
     27   // the delegate consumed the event.
     28   virtual bool OnOverscrollUpdate(float delta_x, float delta_y) = 0;
     29 
     30   // This is called when the overscroll completes.
     31   virtual void OnOverscrollComplete(OverscrollMode overscroll_mode) = 0;
     32 
     33   // This is called when the direction of the overscroll changes.
     34   virtual void OnOverscrollModeChange(OverscrollMode old_mode,
     35                                       OverscrollMode new_mode) = 0;
     36 
     37  private:
     38   DISALLOW_COPY_AND_ASSIGN(OverscrollControllerDelegate);
     39 };
     40 
     41 }  // namespace content
     42 
     43 #endif  // CONTENT_BROWSER_RENDERER_HOST_OVERSCROLL_CONTROLLER_DELEGATE_H_
     44