shell/platform/windows/text_input_plugin.h

// 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_TEXT_INPUT_PLUGIN_H_
#define FLUTTER_SHELL_PLATFORM_WINDOWS_TEXT_INPUT_PLUGIN_H_

#include <map>
#include <memory>

#include "flutter/shell/platform/common/cpp/client_wrapper/include/flutter/binary_messenger.h"
#include "flutter/shell/platform/common/cpp/client_wrapper/include/flutter/method_channel.h"
#include "flutter/shell/platform/common/cpp/json_method_codec.h"
#include "flutter/shell/platform/common/cpp/text_input_model.h"
#include "flutter/shell/platform/windows/keyboard_hook_handler.h"
#include "flutter/shell/platform/windows/public/flutter_windows.h"

namespace flutter {

class Win32FlutterWindow;

// Implements a text input plugin.
//
// Specifically handles window events within windows.
class TextInputPlugin : public KeyboardHookHandler {
 public:
  explicit TextInputPlugin(flutter::BinaryMessenger* messenger);

  virtual ~TextInputPlugin();

  // |KeyboardHookHandler|
  void KeyboardHook(Win32FlutterWindow* window,
                    int key,
                    int scancode,
                    int action,
                    char32_t character) override;

  // |KeyboardHookHandler|
  void TextHook(Win32FlutterWindow* window,
                const std::u16string& text) override;

 private:
  // Sends the current state of the given model to the Flutter engine.
  void SendStateUpdate(const TextInputModel& model);

  // Sends an action triggered by the Enter key to the Flutter engine.
  void EnterPressed(TextInputModel* model);

  // Called when a method is called on |channel_|;
  void HandleMethodCall(
      const flutter::MethodCall<rapidjson::Document>& method_call,
      std::unique_ptr<flutter::MethodResult<rapidjson::Document>> result);

  // The MethodChannel used for communication with the Flutter engine.
  std::unique_ptr<flutter::MethodChannel<rapidjson::Document>> channel_;

  // The active client id.
  int client_id_;

  // The active model. nullptr if not set.
  std::unique_ptr<TextInputModel> active_model_;
};

}  // namespace flutter

#endif  // FLUTTER_SHELL_PLATFORM_WINDOWS_TEXT_INPUT_PLUGIN_H_