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// Copyright (c) 2010 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 VIEWS_TOUCHUI_GESTURE_MANAGER_H_
#define VIEWS_TOUCHUI_GESTURE_MANAGER_H_
#pragma once
#include "base/singleton.h"
namespace views {
class View;
class TouchEvent;
// A GestureManager singleton detects gestures occurring in the
// incoming feed of touch events across all of the RootViews in
// the system. In response to a given touch event, the GestureManager
// updates its internal state and optionally dispatches synthetic
// events to the invoking view.
//
class GestureManager {
public:
virtual ~GestureManager();
static GestureManager* Get();
// Invoked for each touch event that could contribute to the current gesture.
// Takes the event and the View that originated it and which will also
// be the target of any generated synthetic event. Finally, handled
// specifies if the event was actually handled explicitly by a view so that
// GestureManager state can correctly reflect events that are handled
// already.
// Returns true if the event resulted in firing a synthetic event.
virtual bool ProcessTouchEventForGesture(const TouchEvent& event,
View* source,
bool previouslyHandled);
// TODO(rjkroege): Write the remainder of this class.
// It will appear in a subsequent CL.
protected:
GestureManager();
private:
friend struct DefaultSingletonTraits<GestureManager>;
DISALLOW_COPY_AND_ASSIGN(GestureManager);
};
} // namespace views
#endif // VIEWS_TOUCHUI_GESTURE_MANAGER_H_
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