Flutter未知功能插件anitex的使用

AnimatedTextWidget

Getting started

Anitex 是一个简单的包，它允许您隐式地对任何文本进行动画处理。如果旧行和新行长度相同，或者长度差异不大，则可以实现最令人印象深刻的动画。

Example of usage:

以下是一个示例代码，展示了如何在Flutter应用中使用AnimatedText小部件。

示例代码：

import 'dart:math';
import 'package:anitex/anitex.dart';
import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key? key}) : super(key: key);

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 18;
  int _times = 1;

  void _updateTimes() {
    _times++;
  }

  Future<void> _wait(int ms) async {
    await Future.delayed(Duration(milliseconds: ms));
  }

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

  void _decrementCounter() {
    setState(() {
      _counter--;
      _updateTimes();
    });
  }

  void _randomCounter() {
    setState(() {
      _counter = Random().nextInt(10000);
      _updateTimes();
    });
  }

  void _setCounter(int counter) {
    setState(() {
      _counter = counter;
    });
  }

  Future<void> _run() async {
    const int delay = 700;
    await _wait(delay);
    _incrementCounter();
    await _wait(delay);
    _incrementCounter();
    await _wait(delay);
    _incrementCounter();
    await _wait(delay);
    _incrementCounter();
    await _wait(delay);
    _setCounter(90);
    await _wait(delay);
    _setCounter(349);
    await _wait(delay);
    _setCounter(166);
    await _wait(delay);
    _setCounter(939);
    _randomCounter();
    await _wait(delay);
    _randomCounter();
  }

  Widget _buildAnimation() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.center,
      mainAxisAlignment: MainAxisAlignment.center,
      children: <Widget>[
        AnimatedText(
          _times % 7 == 0 ? 'You can really animate any text:' : 'You can animate any text:',
          duration: const Duration(milliseconds: 700),
        ),
        AnimatedText(
          '$_counter',
          style: Theme.of(context).textTheme.headline4,
          useOpacity: true,
          duration: const Duration(milliseconds: 350),
          reversed: true,
        ),
        Row(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            IconButton(
              color: Colors.blue,
              highlightColor: Colors.transparent,
              splashColor: Colors.blue.withOpacity(0.25),
              onPressed: _incrementCounter,
              icon: Icon(Icons.add),
            ),
            IconButton(
              color: Colors.green,
              highlightColor: Colors.transparent,
              splashColor: Colors.blue.withOpacity(0.25),
              onPressed: _randomCounter,
              icon: Icon(Icons.refresh),
            ),
            IconButton(
              color: Colors.red,
              highlightColor: Colors.transparent,
              splashColor: Colors.red.withOpacity(0.25),
              onPressed: _decrementCounter,
              icon: Icon(Icons.remove),
            ),
          ],
        )
      ],
    );
  }

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    _run();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: AnimatedText(
          _times % 7 == 0 ? 'Any text' : 'Anitex demo',
          duration: const Duration(milliseconds: 700),
        ),
      ),
      body: Center(
        child: AnimatedSwitcher(
          duration: const Duration(milliseconds: 300),
          child: _buildAnimation(),
        ),
      ),
    );
  }
}

在这个示例中，我们创建了一个简单的计数器应用程序，其中包含三个按钮：增加、随机化和减少。每个操作都会更新显示的文本，并通过AnimatedText小部件以动画形式呈现变化。AnimatedText支持多种属性，例如duration（持续时间）、useOpacity（是否使用透明度）和reversed（是否反向播放动画），可以根据需要进行配置。

这个Markdown文档提供了一个完整的示例demo，帮助开发者理解和使用`anitex`插件来实现文本动画效果。