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: OverscrollControllerDelegate()19 OverscrollControllerDelegate() {} ~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. 27 virtual void OnOverscrollUpdate(float delta_x, float delta_y) = 0; 28 29 // This is called when the overscroll completes. 30 virtual void OnOverscrollComplete(OverscrollMode overscroll_mode) = 0; 31 32 // This is called when the direction of the overscroll changes. 33 virtual void OnOverscrollModeChange(OverscrollMode old_mode, 34 OverscrollMode new_mode) = 0; 35 36 private: 37 DISALLOW_COPY_AND_ASSIGN(OverscrollControllerDelegate); 38 }; 39 40 } // namespace content 41 42 #endif // CONTENT_BROWSER_RENDERER_HOST_OVERSCROLL_CONTROLLER_DELEGATE_H_ 43