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_CLIENT_KEY_EVENT_MAPPER_H_
6#define REMOTING_CLIENT_KEY_EVENT_MAPPER_H_
7
8#include <map>
9#include <set>
10
11#include "base/basictypes.h"
12#include "base/callback.h"
13#include "base/compiler_specific.h"
14#include "remoting/protocol/input_filter.h"
15
16namespace remoting {
17
18// Filtering InputStub which can be used to re-map the USB keycodes of events
19// before they are passed on to the next InputStub in the chain, or to trap
20// events with specific USB keycodes for special handling.
21class KeyEventMapper : public protocol::InputFilter {
22 public:
23  KeyEventMapper();
24  explicit KeyEventMapper(InputStub* input_stub);
25  virtual ~KeyEventMapper();
26
27  // Callback type for use with SetTrapCallback(), below.
28  typedef base::Callback<void(const protocol::KeyEvent&)> KeyTrapCallback;
29
30  // Sets the callback to which trapped keys will be delivered.
31  void SetTrapCallback(KeyTrapCallback callback);
32
33  // Causes events matching |usb_keycode| to be delivered to the trap callback.
34  // Trapped events are not dispatched to the next InputStub in the chain.
35  void TrapKey(uint32 usb_keycode, bool trap_key);
36
37  // Causes events matching |in_usb_keycode| to be mapped to |out_usb_keycode|.
38  // Keys are remapped at most once. Traps are processed before remapping.
39  void RemapKey(uint32 in_usb_keycode, uint32 out_usb_keycode);
40
41  // InputFilter overrides.
42  virtual void InjectKeyEvent(const protocol::KeyEvent& event) OVERRIDE;
43
44 private:
45  std::map<uint32,uint32> mapped_keys;
46  std::set<uint32> trapped_keys;
47  KeyTrapCallback trap_callback;
48
49  DISALLOW_COPY_AND_ASSIGN(KeyEventMapper);
50};
51
52} // namespace remoting
53
54#endif // REMOTING_CLIENT_KEY_EVENT_MAPPER_H_
55