شرح استخدام ويدجت AnimatedOpacity في فلاتر

AnimatedOpacity(
  opacity: _opacity,
  duration: Duration(seconds: 1),
  child: Container(
    width: 200,
    height: 200,
    color: Colors.blue,
  ),
)

AnimatedOpacity(
  opacity: _opacity,
  duration: Duration(seconds: 1),
  child: Container(
    width: 200,
    height: 200,
    color: Colors.blue,
  ),
)

AnimatedOpacity(
  opacity: _opacity,
  duration: Duration(seconds: 1),
  curve: Curves.easeInOut,
  child: Container(
    width: 200,
    height: 200,
    color: Colors.blue,
  ),
)

AnimatedOpacity(
  opacity: _opacity,
  duration: Duration(seconds: 1),
  onEnd: () {
    print('Animation finished');
  },
  child: Container(
    width: 200,
    height: 200,
    color: Colors.blue,
  ),
)

AnimatedOpacity(
  opacity: _opacity,
  duration: Duration(seconds: 1),
  child: Container(
    width: 200,
    height: 200,
    color: Colors.blue,
  ),
)

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'AnimatedOpacity Example',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyAnimatedOpacity(),
    );
  }
}

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

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

class _MyAnimatedOpacityState extends State<MyAnimatedOpacity> {
  double _opacity = 1.0;
  bool _visible = false;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Animated Opacity Demo',
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Animated Opacity Demo'),
        ),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              AnimatedOpacity(
                opacity: _opacity,
                duration: const Duration(seconds: 1),
                child: Container(
                  width: 200,
                  height: 200,
                  color: Colors.blue,
                ),
              ),
              const SizedBox(height: 20),
              ElevatedButton(
                onPressed: () {
                  setState(() {
                    _opacity = _opacity == 1.0 ? 0.0 : 1.0;
                  });
                },
                child: const Text('Toggle Opacity'),
              ),
              const SizedBox(height: 20),
              ElevatedButton(
                onPressed: () {
                  setState(() {
                    _visible = !_visible;
                  });
                },
                child: const Text('Toggle Visibility'),
              ),
              const SizedBox(height: 20),
              AnimatedOpacity(
                opacity: _visible ? 1.0 : 0.0,
                duration: const Duration(seconds: 1),
                child: Container(
                  width: 200,
                  height: 200,
                  color: Colors.red,
                  child: const Center(
                    child: Text(
                      'Visible',
                      style: TextStyle(
                        color: Colors.white,
                        fontSize: 32,
                        fontWeight: FontWeight.bold,
                      ),
                    ),
                  ),
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}