Move more input-related files to renderer_host/input

content/browser/renderer_host/touch_event_queue.h

-// 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 CONTENT_BROWSER_RENDERER_HOST_TOUCH_EVENT_QUEUE_H_
-#define CONTENT_BROWSER_RENDERER_HOST_TOUCH_EVENT_QUEUE_H_
-
-#include <deque>
-#include <map>
-
-#include "base/basictypes.h"
-#include "content/common/content_export.h"
-#include "content/port/browser/event_with_latency_info.h"
-#include "content/port/common/input_event_ack_state.h"
-#include "third_party/WebKit/public/web/WebInputEvent.h"
-
-namespace content {
-
-class CoalescedWebTouchEvent;
-
-// Interface with which TouchEventQueue can forward touch events, and dispatch
-// touch event responses.
-class TouchEventQueueClient {
- public:
-  virtual ~TouchEventQueueClient() {}
-
-  virtual void SendTouchEventImmediately(
-      const TouchEventWithLatencyInfo& event) = 0;
-
-  virtual void OnTouchEventAck(
-      const TouchEventWithLatencyInfo& event,
-      InputEventAckState ack_result) = 0;
-};
-
-// A queue for throttling and coalescing touch-events.
-class TouchEventQueue {
- public:
-
-  // The |client| must outlive the TouchEventQueue.
-  explicit TouchEventQueue(TouchEventQueueClient* client);
-  virtual ~TouchEventQueue();
-
-  // Adds an event to the queue. The event may be coalesced with previously
-  // queued events (e.g. consecutive touch-move events can be coalesced into a
-  // single touch-move event). The event may also be immediately forwarded to
-  // the renderer (e.g. when there are no other queued touch event).
-  void QueueEvent(const TouchEventWithLatencyInfo& event);
-
-  // Notifies the queue that a touch-event has been processed by the renderer.
-  // At this point, the queue may send one or more gesture events and/or
-  // additional queued touch-events to the renderer.
-  void ProcessTouchAck(InputEventAckState ack_result);
-
-  // Empties the queue of touch events. This may result in any number of gesture
-  // events being sent to the renderer.
-  void FlushQueue();
-
-  // Returns whether the event-queue is empty.
-  bool empty() const WARN_UNUSED_RESULT {
-    return touch_queue_.empty();
-  }
-
- private:
-  friend class MockRenderWidgetHost;
-
-  CONTENT_EXPORT size_t GetQueueSize() const;
-  CONTENT_EXPORT const TouchEventWithLatencyInfo& GetLatestEvent() const;
-
-  // Pops the touch-event from the top of the queue and sends it to the
-  // TouchEventQueueClient. This reduces the size of the queue by one.
-  void PopTouchEventWithAck(InputEventAckState ack_result);
-
-  bool ShouldForwardToRenderer(const WebKit::WebTouchEvent& event) const;
-
-  // Handles touch event forwarding and ack'ed event dispatch.
-  TouchEventQueueClient* client_;
-
-  typedef std::deque<CoalescedWebTouchEvent*> TouchQueue;
-  TouchQueue touch_queue_;
-
-  // Maintain the ACK status for each touch point.
-  typedef std::map<int, InputEventAckState> TouchPointAckStates;
-  TouchPointAckStates touch_ack_states_;
-
-  // Used to defer touch forwarding when ack dispatch triggers |QueueEvent()|.
-  bool dispatching_touch_ack_;
-
-  DISALLOW_COPY_AND_ASSIGN(TouchEventQueue);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_RENDERER_HOST_TOUCH_EVENT_QUEUE_H_