File: remote_input_filter.h

package info (click to toggle)
chromium 138.0.7204.183-1
  • links: PTS, VCS
  • area: main
  • in suites: trixie
  • size: 6,071,908 kB
  • sloc: cpp: 34,937,088; ansic: 7,176,967; javascript: 4,110,704; python: 1,419,953; asm: 946,768; xml: 739,971; pascal: 187,324; sh: 89,623; perl: 88,663; objc: 79,944; sql: 50,304; cs: 41,786; fortran: 24,137; makefile: 21,806; php: 13,980; tcl: 13,166; yacc: 8,925; ruby: 7,485; awk: 3,720; lisp: 3,096; lex: 1,327; ada: 727; jsp: 228; sed: 36
file content (74 lines) | stat: -rw-r--r-- 2,875 bytes parent folder | download | duplicates (7)
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
// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef REMOTING_HOST_REMOTE_INPUT_FILTER_H_
#define REMOTING_HOST_REMOTE_INPUT_FILTER_H_

#include <list>

#include "base/compiler_specific.h"
#include "base/memory/raw_ptr.h"
#include "base/time/time.h"
#include "remoting/protocol/input_event_tracker.h"
#include "remoting/protocol/input_stub.h"
#include "ui/events/event.h"

namespace remoting {

// Filtering InputStub that filters remotely-injected input if it has been
// notified of local input recently.
class RemoteInputFilter : public protocol::InputStub {
 public:
  // Creates a filter which forwards events to the specified InputEventTracker.
  // The filter needs a tracker to release buttons & keys when blocking input.
  explicit RemoteInputFilter(protocol::InputEventTracker* event_tracker);

  RemoteInputFilter(const RemoteInputFilter&) = delete;
  RemoteInputFilter& operator=(const RemoteInputFilter&) = delete;

  ~RemoteInputFilter() override;

  // Informs the filter that local mouse or touch activity has been detected.
  // If the activity does not match events we injected then we assume that it
  // is local, and block remote input for a short while. Returns true if the
  // input was local, or false if it was rejected as an echo.
  bool LocalPointerMoved(const webrtc::DesktopVector& pos, ui::EventType type);

  // Informs the filter that a local keypress event has been detected. If the
  // key does not correspond to one we injected then we assume that it is local,
  // and block remote input for a short while. Returns true if the input was
  // local, or false if it was rejected as an echo.
  bool LocalKeyPressed(uint32_t usb_keycode);

  // Informs the filter that injecting input causes an echo.
  void SetExpectLocalEcho(bool expect_local_echo);

  // InputStub overrides.
  void InjectKeyEvent(const protocol::KeyEvent& event) override;
  void InjectTextEvent(const protocol::TextEvent& event) override;
  void InjectMouseEvent(const protocol::MouseEvent& event) override;
  void InjectTouchEvent(const protocol::TouchEvent& event) override;

 private:
  bool ShouldIgnoreInput() const;
  void LocalInputDetected();

  raw_ptr<protocol::InputEventTracker> event_tracker_;

  // Queue of recently-injected mouse positions and keypresses used to
  // distinguish echoes of injected events from movements from a local
  // input device.
  std::list<webrtc::DesktopVector> injected_mouse_positions_;
  std::list<uint32_t> injected_key_presses_;

  // Time at which local input events were most recently observed.
  base::TimeTicks latest_local_input_time_;

  // If |true| than the filter assumes that injecting input causes an echo.
  bool expect_local_echo_;
};

}  // namespace remoting

#endif  // REMOTING_HOST_REMOTE_INPUT_FILTER_H_