keyboard_key_channel_handler.h

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// Copyright 2013 The Flutter 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 FLUTTER_SHELL_PLATFORM_WINDOWS_KEYBOARD_KEY_CHANNEL_HANDLER_H_
#define FLUTTER_SHELL_PLATFORM_WINDOWS_KEYBOARD_KEY_CHANNEL_HANDLER_H_
 
#include <deque>
#include <memory>
#include <string>
 
#include "flutter/fml/macros.h"
#include "flutter/shell/platform/common/client_wrapper/include/flutter/basic_message_channel.h"
#include "flutter/shell/platform/common/client_wrapper/include/flutter/binary_messenger.h"
#include "flutter/shell/platform/windows/keyboard_key_handler.h"
#include "rapidjson/document.h"
 
namespace flutter {
 
// A delegate of |KeyboardKeyHandler| that handles events by sending the
// raw information through the method channel.
//
// This class communicates with the RawKeyboard API in the framework.
class KeyboardKeyChannelHandler
    : public KeyboardKeyHandler::KeyboardKeyHandlerDelegate {
 public:
  // Create a |KeyboardKeyChannelHandler| by specifying the messenger
  // through which the events are sent.
  explicit KeyboardKeyChannelHandler(flutter::BinaryMessenger* messenger);
 
  ~KeyboardKeyChannelHandler();
 
  // |KeyboardKeyHandler::KeyboardKeyHandlerDelegate|
  void KeyboardHook(int key,
                    int scancode,
                    int action,
                    char32_t character,
                    bool extended,
                    bool was_down,
                    std::function<void(bool)> callback);
 
  void SyncModifiersIfNeeded(int modifiers_state);
 
  std::map<uint64_t, uint64_t> GetPressedState();
 
 private:
  // The Flutter system channel for key event messages.
  std::unique_ptr<flutter::BasicMessageChannel<rapidjson::Document>> channel_;
 
  FML_DISALLOW_COPY_AND_ASSIGN(KeyboardKeyChannelHandler);
};
 
}  // namespace flutter
 
#endif  // FLUTTER_SHELL_PLATFORM_WINDOWS_KEYBOARD_KEY_CHANNEL_HANDLER_H_