passthrough_touch_event_queue.h | Explore in Territory

// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef COMPONENTS_INPUT_PASSTHROUGH_TOUCH_EVENT_QUEUE_H_
#define COMPONENTS_INPUT_PASSTHROUGH_TOUCH_EVENT_QUEUE_H_

#include <set>
#include <string>

#include "base/feature_list.h"
#include "base/gtest_prod_util.h"
#include "base/memory/raw_ptr.h"
#include "base/metrics/field_trial_params.h"
#include "base/time/time.h"
#include "components/input/event_with_latency_info.h"
#include "base/component_export.h"
#include "third_party/blink/public/common/features.h"
#include "third_party/blink/public/mojom/input/input_event_result.mojom-shared.h"
#include "ui/events/blink/blink_features.h"

namespace content {
class InputRouterImplTestBase;
} // namespace content

namespace input {

class TouchTimeoutHandler;

// Interface with which PassthroughTouchEventQueue can forward touch events, and
// dispatch touch event responses.
class COMPONENT_EXPORT(INPUT) PassthroughTouchEventQueueClient { … };

// A queue that processes a touch-event and forwards it on to the
// renderer process immediately. This class assumes that queueing will
// happen inside the renderer process. This class will hold onto the pending
// events so that it can re-order the acks so that they appear in a
// logical order to the rest of the browser process. Due to the threaded
// model of the renderer it is possible that an ack for a touchend can
// be sent before the corresponding ack for the touchstart. This class
// corrects that state.
//
// This class also performs filtering over the sequence of touch-events to, for
// example, avoid sending events to the renderer that would have no effect. By
// default, we always forward touchstart and touchend but, if there are no
// handlers, touchmoves are filtered out of the sequence. The filtering logic
// is implemented in |FilterBeforeForwarding|.
class COMPONENT_EXPORT(INPUT) PassthroughTouchEventQueue { … };

}  // namespace input

#endif  // COMPONENTS_INPUT_PASSTHROUGH_TOUCH_EVENT_QUEUE_H_
chromium/components/input/passthrough_touch_event_queue.h
