1 /* 2 * Copyright (C) 2021 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 /*! \file MessageHandler.h */ 17 #ifndef SERVICES_INCLUDE_MESSAGE_HANDLER_H 18 #define SERVICES_INCLUDE_MESSAGE_HANDLER_H 19 20 #include <condition_variable> 21 #include <mutex> 22 #include <queue> 23 24 #include "global.h" 25 #include "message.h" 26 #include "message_parcel.h" 27 28 namespace OHOS { 29 namespace MiscServices { 30 namespace MessageID { 31 enum { 32 MSG_ID_USER_START = 0, // a user started 33 MSG_ID_USER_REMOVED, // a user removed 34 MSG_ID_PACKAGE_REMOVED, // a package is removed 35 MSG_ID_SELECT_BY_RANGE, 36 MSG_ID_SELECT_BY_MOVEMENT, 37 MSG_ID_HANDLE_EXTEND_ACTION, 38 39 MSG_ID_HIDE_KEYBOARD_SELF, // hide the current keyboard 40 41 // the request from IMSA to IMC 42 MSG_ID_INSERT_CHAR, 43 MSG_ID_DELETE_FORWARD, 44 MSG_ID_DELETE_BACKWARD, 45 MSG_ID_ON_INPUT_STOP, 46 MSG_ID_SEND_KEYBOARD_STATUS, 47 MSG_ID_SEND_FUNCTION_KEY, 48 MSG_ID_MOVE_CURSOR, 49 MSG_ID_ON_SWITCH_INPUT, 50 MSG_ID_GET_TEXT_INDEX_AT_CURSOR, 51 MSG_ID_GET_TEXT_BEFORE_CURSOR, 52 MSG_ID_GET_TEXT_AFTER_CURSOR, 53 MSG_ID_ON_PANEL_STATUS_CHANGE, 54 55 // the request from IMSA to IMA 56 MSG_ID_STOP_INPUT_SERVICE, 57 MSG_ID_INIT_INPUT_CONTROL_CHANNEL, 58 MSG_ID_SET_SUBTYPE, 59 60 // the request from IMC to IMA 61 MSG_ID_ON_CURSOR_UPDATE, 62 MSG_ID_ON_SELECTION_CHANGE, 63 MSG_ID_ON_CONFIGURATION_CHANGE, 64 MSG_ID_QUIT_WORKER_THREAD, 65 }; 66 } 67 68 class MessageHandler { 69 public: 70 MessageHandler(); 71 ~MessageHandler(); 72 void SendMessage(Message *msg); 73 Message *GetMessage(); 74 static MessageHandler *Instance(); 75 76 private: 77 std::mutex mMutex; // a mutex to guard message queue 78 std::condition_variable mCV; // condition variable to work with mMutex 79 std::queue<Message *> mQueue; // Message queue, guarded by mMutex; 80 81 MessageHandler(const MessageHandler &); 82 MessageHandler &operator=(const MessageHandler &); 83 MessageHandler(const MessageHandler &&); 84 MessageHandler &operator=(const MessageHandler &&); 85 }; 86 } // namespace MiscServices 87 } // namespace OHOS 88 #endif // SERVICES_INCLUDE_MESSAGE_HANDLER_H 89