102 lines
2.8 KiB
Dart
102 lines
2.8 KiB
Dart
import 'package:app/global/config.dart';
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import 'package:app/request/api/room_api.dart';
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import 'package:app/request/dto/room/board_token_dto.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter_easyloading/flutter_easyloading.dart';
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import 'package:webview_flutter/webview_flutter.dart';
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import 'board_dialog.dart';
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class BoardManager {
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BoardManager._();
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static final BoardManager _instance = BoardManager._();
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factory BoardManager() => _instance;
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WebViewController? _webViewController;
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BoardTokenDto? _boardToken;
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///获取token
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Future<void> _fetchToken(int roomId) async {
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final now = DateTime.now();
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if (_boardToken == null) {
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EasyLoading.show(status: "开启白板中");
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_boardToken = await getBoardTokenApi(roomId);
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} else {
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//离过期差多少小时
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int remainSeconds = _boardToken!.expiresAt.difference(now).inSeconds;
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// 剩余不足 2 小时 = 7200 秒
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if (remainSeconds <= 7200) {
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EasyLoading.show(status: "开启白板中");
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_boardToken = await getBoardTokenApi(roomId);
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}
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}
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EasyLoading.dismiss();
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}
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///生成完整 URL
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/// -[uid] 用户
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/// -[roomId] 房间id
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/// -[isTeacher] 是否是老师
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Future<String> buildUrl({
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required String uid,
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required int roomId,
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required bool isTeacher,
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}) async {
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await _fetchToken(roomId);
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Map<String, dynamic> params = {
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"appid": _boardToken!.whiteboardAppid,
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"uid": uid,
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"uuid": _boardToken!.whiteboardUuid,
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"room_token": _boardToken!.whiteboardToken,
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"write": isTeacher ? 1 : 0,
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};
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String paramStr = params.entries.map((e) => "${e.key}=${e.value}").join("&");
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return "${Config.webUrl}/board?$paramStr";
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}
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/// 获取全局唯一 WebViewController
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Future<WebViewController> getController(String url) async {
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if (_webViewController != null) return _webViewController!;
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_webViewController = WebViewController()
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..setJavaScriptMode(JavaScriptMode.unrestricted)
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..setNavigationDelegate(
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// ⭐ 加上加载监听（BoardDialog 再 listen 一次也没关系）
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NavigationDelegate(
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onPageStarted: (_) {},
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onPageFinished: (_) {},
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),
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)
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..loadRequest(Uri.parse(url));
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return _webViewController!;
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}
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///打开白板
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/// -[uid] 用户名+id
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/// -[roomId] 房间id
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/// -[isTeacher] 是否是老师
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Future<void> showBoardDialog(
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BuildContext context, {
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required String uid,
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required int roomId,
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required bool isTeacher,
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}) async {
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String url = await buildUrl(
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uid: uid,
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roomId: roomId,
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isTeacher: isTeacher,
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);
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final controller = await getController(url);
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showDialog(
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context: context,
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builder: (_) => BoardDialog(controller: controller),
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);
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}
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}
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