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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_H_
#define CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_H_
#include "base/memory/scoped_ptr.h"
#include "base/time/time.h"
#include "content/common/content_export.h"
#include "content/common/input/synthetic_gesture_params.h"
#include "third_party/WebKit/public/web/WebInputEvent.h"
namespace content {
class SyntheticGestureTarget;
// Base class for synthetic gesture implementations. A synthetic gesture class
// is responsible for forwaring InputEvents, simulating the gesture, to a
// SyntheticGestureTarget.
//
// Adding new gesture types involved the following steps:
// 1) Create a sub-type of SyntheticGesture that implements the gesture.
// 2) Extend SyntheticGesture::Create with the new class.
// 3) Add at least one unit test per supported input source type (touch,
// mouse, etc) to SyntheticGestureController unit tests. The unit tests
// only checks basic functionality and termination. If the gesture is
// hooked up to Telemetry its correctness can additionally be tested there.
class CONTENT_EXPORT SyntheticGesture {
public:
SyntheticGesture();
virtual ~SyntheticGesture();
static scoped_ptr<SyntheticGesture> Create(
const SyntheticGestureParams& gesture_params);
enum Result {
GESTURE_RUNNING,
GESTURE_FINISHED,
GESTURE_SOURCE_TYPE_NOT_IMPLEMENTED,
GESTURE_SOURCE_TYPE_NOT_SUPPORTED_BY_PLATFORM,
GESTURE_RESULT_MAX = GESTURE_SOURCE_TYPE_NOT_SUPPORTED_BY_PLATFORM
};
// Update the state of the gesture and forward the appropriate events to the
// platform. This function is called repeatedly by the synthetic gesture
// controller until it stops returning GESTURE_RUNNING.
virtual Result ForwardInputEvents(
const base::TimeDelta& interval, SyntheticGestureTarget* target) = 0;
private:
DISALLOW_COPY_AND_ASSIGN(SyntheticGesture);
};
} // namespace content
#endif // CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_H_
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