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 16 namespace 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. 21 class 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