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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_RENDERER_HOST_OVERSCROLL_CONTROLLER_DELEGATE_H_
#define CONTENT_BROWSER_RENDERER_HOST_OVERSCROLL_CONTROLLER_DELEGATE_H_
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "content/browser/renderer_host/overscroll_controller.h"
#include "ui/gfx/geometry/rect.h"
namespace content {
// The delegate receives overscroll gesture updates from the controller and
// should perform appropriate actions.
class OverscrollControllerDelegate {
public:
OverscrollControllerDelegate() {}
virtual ~OverscrollControllerDelegate() {}
// Get the bounds of the view corresponding to the delegate. Overscroll-ending
// events will only be processed if the visible bounds are non-empty.
virtual gfx::Rect GetVisibleBounds() const = 0;
// This is called for each update in the overscroll amount. Returns true if
// the delegate consumed the event.
virtual bool OnOverscrollUpdate(float delta_x, float delta_y) = 0;
// This is called when the overscroll completes.
virtual void OnOverscrollComplete(OverscrollMode overscroll_mode) = 0;
// This is called when the direction of the overscroll changes.
virtual void OnOverscrollModeChange(OverscrollMode old_mode,
OverscrollMode new_mode) = 0;
private:
DISALLOW_COPY_AND_ASSIGN(OverscrollControllerDelegate);
};
} // namespace content
#endif // CONTENT_BROWSER_RENDERER_HOST_OVERSCROLL_CONTROLLER_DELEGATE_H_
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