在dart中隐藏和显示小部件

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('Hide and Show Widget')),
        body: MyWidget(),
      ),
    );
  }
}

class MyWidget extends StatefulWidget {
  @override
  _MyWidgetState createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  bool _isVisible = true;

  void _toggleVisibility() {
    setState(() {
      _isVisible = !_isVisible;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        if (_isVisible) Text('This widget can be hidden'),
        ElevatedButton(
          onPressed: _toggleVisibility,
          child: Text('Toggle Visibility'),
        ),
      ],
    );
  }
}

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('Hide and Show Widget')),
        body: MyWidget(),
      ),
    );
  }
}

class MyWidget extends StatefulWidget {
  @override
  _MyWidgetState createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  bool _isVisible = true;

  void _toggleVisibility() {
    setState(() {
      _isVisible = !_isVisible;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        Visibility(
          visible: _isVisible,
          child: Text('This widget can be hidden with animation'),
          maintainSize: true,
          maintainAnimation: true,
          maintainState: true,
          fadeDuration: Duration(seconds: 1),
        ),
        ElevatedButton(
          onPressed: _toggleVisibility,
          child: Text('Toggle Visibility'),
        ),
      ],
    );
  }
}