- add sources.
[platform/framework/web/crosswalk.git] / src / remoting / host / remote_input_filter.h
1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef REMOTING_HOST_REMOTE_INPUT_FILTER_H_
6 #define REMOTING_HOST_REMOTE_INPUT_FILTER_H_
7
8 #include <list>
9
10 #include "base/basictypes.h"
11 #include "base/compiler_specific.h"
12 #include "base/time/time.h"
13 #include "remoting/protocol/input_event_tracker.h"
14 #include "remoting/protocol/input_stub.h"
15 #include "third_party/skia/include/core/SkPoint.h"
16
17 namespace remoting {
18
19 // Filtering InputStub that filters remotely-injected input if it has been
20 // notified of local input recently.
21 class RemoteInputFilter : public protocol::InputStub {
22  public:
23   // Creates a filter forwarding events to the specified InputEventTracker.
24   // The filter needs a tracker to release buttons & keys when blocking input.
25   explicit RemoteInputFilter(protocol::InputEventTracker* event_tracker);
26   virtual ~RemoteInputFilter();
27
28   // Informs the filter that local mouse activity has been detected.  If the
29   // activity does not match events we injected then we assume that it is local,
30   // and block remote input for a short while.
31   void LocalMouseMoved(const SkIPoint& mouse_pos);
32
33   // Informs the filter that injecting input causes an echo.
34   void SetExpectLocalEcho(bool expect_local_echo);
35
36   // InputStub overrides.
37   virtual void InjectKeyEvent(const protocol::KeyEvent& event) OVERRIDE;
38   virtual void InjectMouseEvent(const protocol::MouseEvent& event) OVERRIDE;
39
40  private:
41   bool ShouldIgnoreInput() const;
42
43   protocol::InputEventTracker* event_tracker_;
44
45   // Queue of recently-injected mouse positions used to distinguish echoes of
46   // injected events from movements from a local input device.
47   std::list<SkIPoint> injected_mouse_positions_;
48
49   // Time at which local input events were most recently observed.
50   base::TimeTicks latest_local_input_time_;
51
52   // If |true| than the filter assumes that injecting input causes an echo.
53   bool expect_local_echo_;
54
55   DISALLOW_COPY_AND_ASSIGN(RemoteInputFilter);
56 };
57
58 }  // namespace remoting
59
60 #endif  // REMOTING_HOST_REMOTE_INPUT_FILTER_H_