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// 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 REMOTING_CLIENT_KEY_EVENT_MAPPER_H_
#define REMOTING_CLIENT_KEY_EVENT_MAPPER_H_
#include <stdint.h>
#include <map>
#include <set>
#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "remoting/protocol/input_filter.h"
namespace remoting {
// Filtering InputStub which can be used to re-map the USB keycodes of events
// before they are passed on to the next InputStub in the chain, or to trap
// events with specific USB keycodes for special handling.
class KeyEventMapper : public protocol::InputFilter {
public:
KeyEventMapper();
explicit KeyEventMapper(InputStub* input_stub);
~KeyEventMapper() override;
// Callback type for use with SetTrapCallback(), below.
typedef base::Callback<void(const protocol::KeyEvent&)> KeyTrapCallback;
// Sets the callback to which trapped keys will be delivered.
void SetTrapCallback(KeyTrapCallback callback);
// Causes events matching |usb_keycode| to be delivered to the trap callback.
// Trapped events are not dispatched to the next InputStub in the chain.
void TrapKey(uint32_t usb_keycode, bool trap_key);
// Causes events matching |in_usb_keycode| to be mapped to |out_usb_keycode|.
// Keys are remapped at most once. Traps are processed before remapping.
void RemapKey(uint32_t in_usb_keycode, uint32_t out_usb_keycode);
// InputFilter overrides.
void InjectKeyEvent(const protocol::KeyEvent& event) override;
private:
std::map<uint32_t, uint32_t> mapped_keys;
std::set<uint32_t> trapped_keys;
KeyTrapCallback trap_callback;
DISALLOW_COPY_AND_ASSIGN(KeyEventMapper);
};
} // namespace remoting
#endif // REMOTING_CLIENT_KEY_EVENT_MAPPER_H_
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