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// Copyright 2013 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_INPUT_SYNTHETIC_GESTURE_CONTROLLER_H_
#define CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_CONTROLLER_H_
#include <queue>
#include <utility>
#include "base/callback.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/scoped_vector.h"
#include "base/time/time.h"
#include "content/browser/renderer_host/input/synthetic_gesture.h"
#include "content/common/content_export.h"
#include "content/common/input/synthetic_gesture_params.h"
namespace content {
class SyntheticGestureTarget;
// Controls a synthetic gesture.
// Repeatedly invokes the gesture object's ForwardInputEvent method to send
// input events to the platform until the gesture has finished.
class CONTENT_EXPORT SyntheticGestureController {
public:
explicit SyntheticGestureController(
scoped_ptr<SyntheticGestureTarget> gesture_target);
virtual ~SyntheticGestureController();
typedef base::Callback<void(SyntheticGesture::Result)>
OnGestureCompleteCallback;
void QueueSyntheticGesture(
scoped_ptr<SyntheticGesture> synthetic_gesture,
const OnGestureCompleteCallback& completion_callback);
// Forward input events of the currently processed gesture.
void Flush(base::TimeTicks timestamp);
// To be called when all events generated from the current gesture have been
// fully flushed from the input pipeline (i.e., sent, processed and ack'ed).
void OnDidFlushInput();
private:
void StartGesture(const SyntheticGesture& gesture);
void StopGesture(const SyntheticGesture& gesture,
const OnGestureCompleteCallback& completion_callback,
SyntheticGesture::Result result);
scoped_ptr<SyntheticGestureTarget> gesture_target_;
scoped_ptr<SyntheticGesture::Result> pending_gesture_result_;
// A queue of gesture/callback pairs. Implemented as two queues to
// simplify the ownership of SyntheticGesture pointers.
class GestureAndCallbackQueue {
public:
GestureAndCallbackQueue();
~GestureAndCallbackQueue();
void Push(scoped_ptr<SyntheticGesture> gesture,
const OnGestureCompleteCallback& callback) {
gestures_.push_back(gesture.release());
callbacks_.push(callback);
}
void Pop() {
gestures_.erase(gestures_.begin());
callbacks_.pop();
}
SyntheticGesture* FrontGesture() {
return gestures_.front();
}
OnGestureCompleteCallback& FrontCallback() {
return callbacks_.front();
}
bool IsEmpty() {
CHECK(gestures_.empty() == callbacks_.empty());
return gestures_.empty();
}
private:
ScopedVector<SyntheticGesture> gestures_;
std::queue<OnGestureCompleteCallback> callbacks_;
} pending_gesture_queue_;
DISALLOW_COPY_AND_ASSIGN(SyntheticGestureController);
};
} // namespace content
#endif // CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_CONTROLLER_H_
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