Flutter时间重叠检测插件overlapping_time的使用

Flutter时间重叠检测插件overlapping_time的使用

overlapping_time 是一个用于检测给定时间范围之间重叠情况的包。

使用方法

要比较的时间范围类型可以是 TimeOfDayRange 或者 DateTimeRange。这两种类型分别由该包和 Flutter 提供。

TimeOfDayRange

import 'package:overlapping_time/overlapping_time.dart';

void main() {
  // 01:00 - 04:00
  final TimeOfDayRange rangeA = TimeOfDayRange(
    start: TimeOfDayRange(hour: 1, minute: 0),
    end: TimeOfDayRange(hour: 4, minute: 0),
  );
  // 02:00 - 05:00
  final TimeOfDayRange rangeB = TimeOfDayRange(
    start: TimeOfDayRange(hour: 2, minute: 0),
    end: TimeOfDayRange(hour: 5, minute: 0),
  );
  // 03:00 - 06:00
  final TimeOfDayRange rangeC = TimeOfDayRange(
    start: TimeOfDayRange(hour: 3, minute: 0),
    end: TimeOfDayRange(hour: 6, minute: 0),
  );

  final List ranges = [rangeA, rangeB, rangeC];

  final Map<int, List<ComparingResult>> searchResults = findOverlap(ranges: ranges);

  // 提取所有3个范围都重叠的部分
  final TimeOfDayRange overlappingRange = searchResults[3].first.overlappingRange;
  print(overlappingRange);
}

输出结果：

TimeOfDay(3:00) - TimeOfDay(04:00)

DateTimeRange

import 'package:overlapping_time/overlapping_time.dart';

void main() {
  // 2020-1-1 01:00 - 2020-1-1 04:00
  final DateTimeRange rangeA = DateTimeRange(
    start: DateTime(2020, 1, 1, 1, 0),
    end: DateTime(2020, 1, 1, 4, 0),
  );
  // 2020-1-1 02:00 - 2020-1-1 05:00
  final DateTimeRange rangeB = DateTimeRange(
    start: DateTime(2020, 1, 1, 2, 0),
    end: DateTime(2020, 1, 1, 5, 0),
  );
  // 2020-1-1 03:00 - 2020-1-1 06:00
  final DateTimeRange rangeC = DateTimeRange(
    start: DateTime(2020, 1, 1, 3, 0),
    end: DateTime(2020, 1, 1, 6, 0),
  );

  final List ranges = [rangeA, rangeB, rangeC];

  final Map<int, List<ComparingResult>> searchResults = findOverlap(items: ranges);

  // 提取所有3个范围都重叠的部分
  final DateTimeRange overlappingRange = searchResults[3].first.overlappingRange;
  print(overlappingRange);
}

输出结果：

2020-01-01 03:00:00.000 - 2020-01-01 04:00:00.000

示例代码

以下是一个完整的示例代码，展示了如何在 Flutter 应用程序中使用 overlapping_time 插件来检测时间重叠。

import 'package:flutter/material.dart';
import 'package:overlapping_time/overlapping_time.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  [@override](/user/override)
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text(
              '你已经点击了按钮多少次：',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: '增加',
        child: const Icon(Icons.add),
      ),
    );
  }
}