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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_COMMON_INPUT_SYNTHETIC_GESTURE_PARAMS_H_
#define CONTENT_COMMON_INPUT_SYNTHETIC_GESTURE_PARAMS_H_
#include "base/memory/scoped_ptr.h"
#include "content/common/content_export.h"
namespace content {
// Base class for storing parameters of synthetic gestures. Sending an object
// over IPC is handled by encapsulating it in a SyntheticGesturePacket object.
//
// The subclasses of this class only store data on synthetic gestures.
// The logic for dispatching input events that implement the gesture lives
// in separate classes in content/browser/renderer_host/input/.
//
// Adding new gesture types involves the following steps:
// 1) Create a new sub-type of SyntheticGestureParams with the parameters
// needed for the new gesture.
// 2) Use IPC macros to create serialization methods for the new type in
// content/common/input_messages.h.
// 3) Extend ParamTraits<content::SyntheticGesturePacket>::Write/Read/Log in
// content/common/input/input_param_traits.cc.
// 4) Add a new unit test to make sure that sending the type over IPC works
// correctly.
// The details of each step should become clear when looking at other types.
struct CONTENT_EXPORT SyntheticGestureParams {
SyntheticGestureParams();
SyntheticGestureParams(const SyntheticGestureParams& other);
virtual ~SyntheticGestureParams();
// Describes which type of input events synthetic gesture objects should
// generate. When specifying DEFAULT_INPUT the platform will be queried for
// the preferred input event type.
enum GestureSourceType {
DEFAULT_INPUT,
TOUCH_INPUT,
MOUSE_INPUT,
GESTURE_SOURCE_TYPE_MAX = MOUSE_INPUT
};
GestureSourceType gesture_source_type;
enum GestureType {
SMOOTH_SCROLL_GESTURE,
SMOOTH_DRAG_GESTURE,
PINCH_GESTURE,
TAP_GESTURE,
POINTER_ACTION,
SYNTHETIC_GESTURE_TYPE_MAX = POINTER_ACTION
};
virtual GestureType GetGestureType() const = 0;
// Returns true if the specific gesture source type is supported on this
// platform.
static bool IsGestureSourceTypeSupported(
GestureSourceType gesture_source_type);
};
} // namespace content
#endif // CONTENT_COMMON_INPUT_SYNTHETIC_GESTURE_PARAMS_H_
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