自习室优化ok

lib/widgets/room/core/count_down_vm.dart

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+import 'dart:async';
+
+import 'package:app/data/models/meeting_room_dto.dart';
+import 'package:app/utils/time.dart';
+import 'package:flutter/cupertino.dart';
+
+class CountDownVM extends ChangeNotifier {
+  MeetingRoomDto? roomInfo;
+
+  ///会议开始倒计时秒数
+  Timer? _startTime;
+  int _startCountDown = 0;
+
+  ///会议结束倒计时秒数
+  Timer? _endTime;
+  int _endCountDown = -1;
+
+  ///会议进行中的秒数
+  int studyTime = 0;
+
+  int get startCountDown => _startCountDown;
+
+  int get endCountDown => _endCountDown;
+
+  ///是否能开始自习室
+  bool get canEnterRoom {
+    final now = DateTime.now();
+    if (now.isAfter(parseTime(roomInfo!.startTime))) {
+      return true;
+    }
+    return false;
+  }
+
+  //绑定
+  void bind(MeetingRoomDto info) {
+    if (roomInfo == info) return;
+    roomInfo = info;
+    _startEndCountdown();
+    //如果会议室结束，停止计时器
+    if (roomInfo?.roomStatus == 2) {
+      _endTime?.cancel();
+    }
+  }
+
+  ///启动距离会议结束还有多少秒
+  void _startEndCountdown() {
+    if (roomInfo!.actualStartTime.isEmpty || roomInfo!.roomStatus != 1) return;
+    _endTime?.cancel();
+
+    DateTime endTime = parseTime(roomInfo!.endTime);
+    DateTime startTime = DateTime.parse(roomInfo!.actualStartTime);
+
+    _endCountDown = endTime.difference(startTime).inSeconds;
+
+    _endTime = Timer.periodic(Duration(seconds: 1), (timer) {
+      _endCountDown--;
+      studyTime++;
+      if (_endCountDown <= 0) {
+        _endTime?.cancel();
+      }
+      notifyListeners();
+    });
+  }
+
+  ///启动距离会议开始还有多少秒
+  void startStartCountdown() {
+    if (roomInfo?.roomStatus != 0) return;
+    _startTime?.cancel();
+    final now = DateTime.now();
+    final startTime = parseTime(roomInfo!.startTime);
+
+    _startCountDown = startTime.difference(now).inSeconds;
+    if (_startCountDown <= 0) {
+      return;
+    }
+
+    _startTime = Timer.periodic(Duration(seconds: 1), (timer) {
+      _startCountDown--;
+      if (_startCountDown <= 0) {
+        _startTime?.cancel();
+        _startTime = null;
+      }
+      notifyListeners();
+    });
+  }
+
+  @override
+  void dispose() {
+    _startTime?.cancel();
+    _endTime?.cancel();
+    super.dispose();
+  }
+}