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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 UI_AURA_GESTURES_GESTURE_RECOGNIZER_H_
#define UI_AURA_GESTURES_GESTURE_RECOGNIZER_H_
#pragma once
#include <vector>
#include "base/memory/linked_ptr.h"
#include "ui/aura/aura_export.h"
#include "ui/base/events.h"
namespace aura {
class GestureEvent;
class TouchEvent;
class Window;
// A GestureRecognizer is an abstract base class for conversion of touch events
// into gestures.
class AURA_EXPORT GestureRecognizer {
public:
static GestureRecognizer* Create();
// List of GestureEvent*.
typedef std::vector<linked_ptr<GestureEvent> > Gestures;
virtual ~GestureRecognizer() {}
// Invoked for each touch event that could contribute to the current gesture.
// Returns list of zero or more GestureEvents identified after processing
// TouchEvent.
// Caller would be responsible for freeing up Gestures.
virtual Gestures* ProcessTouchEventForGesture(const TouchEvent& event,
ui::TouchStatus status) = 0;
// Touch-events can be queued to be played back at a later time. The queues
// are identified by the target window.
virtual void QueueTouchEventForGesture(Window* window,
const TouchEvent& event) = 0;
// Process the touch-event in the queue for the window. Returns a list of
// zero or more GestureEvents identified after processing the queueud
// TouchEvent. Caller is responsible for freeing up Gestures.
virtual Gestures* AdvanceTouchQueue(Window* window,
bool processed) = 0;
// Flushes the touch event queue (or removes the queue) for the window.
virtual void FlushTouchQueue(Window* window) = 0;
};
} // namespace aura
#endif // UI_AURA_GESTURES_GESTURE_RECOGNIZER_H_
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