blob: 3bd90fc92263821ea7d472204fdd11750b7114ec (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
// 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/common/input_event_ack_state.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebInputEvent.h"
namespace content {
class CoalescedWebTouchEvent;
class MockRenderWidgetHost;
class RenderWidgetHostImpl;
// A queue for throttling and coalescing touch-events.
class TouchEventQueue {
public:
explicit TouchEventQueue(RenderWidgetHostImpl* host);
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 WebKit::WebTouchEvent& 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();
// Resets all internal state. This does not trigger any touch or gesture
// events to be sent.
void Reset();
// 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 WebKit::WebTouchEvent& GetLatestEvent() const;
// Pops the touch-event from the top of the queue and sends it to the
// RenderWidgetHostView. This reduces the size of the queue by one.
void PopTouchEventToView(InputEventAckState ack_result);
bool ShouldForwardToRenderer(const WebKit::WebTouchEvent& event) const;
// The RenderWidgetHost that owns this event-queue.
RenderWidgetHostImpl* render_widget_host_;
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_;
DISALLOW_COPY_AND_ASSIGN(TouchEventQueue);
};
} // namespace content
#endif // CONTENT_BROWSER_RENDERER_HOST_TOUCH_EVENT_QUEUE_H_
|
