[英]Flutter open dialog with animation
我正在开发一个移动应用程序,我想通过一些很酷的对话框动画来改善用户体验,我不想只使用一个简单的弹出对话框。
基本上我想要的结果是这样的:
在网上搜索了一下,发现了类似的问题: Animation with hero and showDialog in flutter 。
我试图开发一些东西,结果如下:
我不知道如何重现容器中的东西。 也许在正确的 animation(第一张图片)中,他们放置了一个不可见的小对话框,一旦按下按钮,它就会与 animation 一起出现?
我应该在哪里输入框对话框的信息?
这是我使用的代码:
Stack(
children: [
Positioned(
child: GoogleMap(
initialCameraPosition: CameraPosition(
target: LatLng(10, 10),
),
),
),
Positioned(
child: Container(
height: 100,
width: w,
color: Colors.white,
),
),
Positioned(
child: Padding(
padding: const EdgeInsets.only(top: 50),
child: Align(
alignment: Alignment.topCenter,
child: GestureDetector(
child: AnimatedContainer(
height: _h,
width: _w,
color: Colors.lightGreen,
duration: Duration(seconds: 1),
child: Center(
child: Text(
'Title',
),
),
),
onTap: () {
setState(() {
_h = 200;
_w = w * 0.9;
});
},
),
),
),
),
],
),
我建议你使用官方动画 package https://pub.dev/packages/animations中的 Container transform 过渡模式
在showDialog
的builder
上使用ScaleTransition
可以产生类似的效果。
builder
将返回一个StatefulWidget
@override
Widget build(BuildContext context) {
return ScaleTransition(
scale: animation,
alignment: Alignment.topLeft, // use different alignment
child: const AlertDialog(
backgroundColor: Colors.cyanAccent,
title: Text("title"),
),
);
}
它会像这样使用
showDialog(
context: context,
builder: (context) => CustomAlertDialog(),
);
测试小部件:
class CustomAlertDialog extends StatefulWidget {
const CustomAlertDialog({Key? key}) : super(key: key);
@override
_CustomAlertDialogState createState() => _CustomAlertDialogState();
}
class _CustomAlertDialogState extends State<CustomAlertDialog>
with SingleTickerProviderStateMixin {
late AnimationController controller;
late Animation<double> animation;
@override
void initState() {
super.initState();
_initScaleAnimation();
}
_initScaleAnimation() {
controller = AnimationController(
vsync: this,
duration: const Duration(seconds: 1),
)..addListener(() => setState(() {}));
animation = Tween<double>(begin: 0, end: 1.0).animate(controller);
controller.forward();
}
@override
Widget build(BuildContext context) {
return ScaleTransition(
scale: animation,
alignment: Alignment.topLeft, // use different alignment
child: const AlertDialog(
backgroundColor: Colors.cyanAccent,
title: Text("title"),
),
);
}
}
我有一个解决方案:
/**
* @author Gilmar N. Lima
* @email gstrtoint@gmail.com or adminti@isofttec.com.br
* @create date 25-01-2023 12:25:20
* @modify date 25-01-2023 12:25:20
* @desc [description]
*/
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
// This is the theme of your application.
//
// Try running your application with "flutter run". You'll see the
// application has a blue toolbar. Then, without quitting the app, try
// changing the primarySwatch below to Colors.green and then invoke
// "hot reload" (press "r" in the console where you ran "flutter run",
// or simply save your changes to "hot reload" in a Flutter IDE).
// Notice that the counter didn't reset back to zero; the application
// is not restarted.
primarySwatch: Colors.blue,
),
home: const MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({super.key, required this.title});
// This widget is the home page of your application. It is stateful, meaning
// that it has a State object (defined below) that contains fields that affect
// how it looks.
// This class is the configuration for the state. It holds the values (in this
// case the title) provided by the parent (in this case the App widget) and
// used by the build method of the State. Fields in a Widget subclass are
// always marked "final".
final String title;
@override
State createState() => _MyHomePageState();
}
class _MyHomePageState extends State {
int _counter = 0;
GlobalKey _widgetKey = GlobalKey();
void _incrementCounter() {
setState(() {
// This call to setState tells the Flutter framework that something has
// changed in this State, which causes it to rerun the build method below
// so that the display can reflect the updated values. If we changed
// _counter without calling setState(), then the build method would not be
// called again, and so nothing would appear to happen.
_counter++;
});
}
@override
Widget build(BuildContext context) {
// This method is rerun every time setState is called, for instance as done
// by the _incrementCounter method above.
//
// The Flutter framework has been optimized to make rerunning build methods
// fast, so that you can just rebuild anything that needs updating rather
// than having to individually change instances of widgets.
return Scaffold(
appBar: AppBar(
// Here we take the value from the MyHomePage object that was created by
// the App.build method, and use it to set our appbar title.
title: Text(widget.title),
),
body: Center(
// Center is a layout widget. It takes a single child and positions it
// in the middle of the parent.
child: Column(
// Column is also a layout widget. It takes a list of children and
// arranges them vertically. By default, it sizes itself to fit its
// children horizontally, and tries to be as tall as its parent.
//
// Invoke "debug painting" (press "p" in the console, choose the
// "Toggle Debug Paint" action from the Flutter Inspector in Android
// Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
// to see the wireframe for each widget.
//
// Column has various properties to control how it sizes itself and
// how it positions its children. Here we use mainAxisAlignment to
// center the children vertically; the main axis here is the vertical
// axis because Columns are vertical (the cross axis would be
// horizontal).
mainAxisAlignment: MainAxisAlignment.start,
children: [
Padding(
padding: const EdgeInsets.all(16.0),
child: ElevatedButton(
key: _widgetKey,
child: const Text('Alert'),
onPressed: () {
_scaleDialog();
},
),
)
]),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: const Icon(Icons.add),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
Widget _dialog(BuildContext context) {
return AlertDialog(
title: const Text("Dialog title"),
content: const Text("Simple Dialog content"),
actions: [
TextButton(
onPressed: () {
Navigator.of(context).pop();
},
child: const Text("Ok"))
],
);
}
void _scaleDialog() {
showGeneralDialog(
context: context,
pageBuilder: (ctx, a1, a2) {
return Container();
},
transitionBuilder: (ctx, a1, a2, child) {
var curve = Curves.easeInOut.transform(a1.value);
RenderBox? boxs =
_widgetKey.currentContext!.findRenderObject() as RenderBox?;
Offset posit = boxs!.localToGlobal(Offset.zero);
return Transform.scale(
scale: curve,
child: _dialog(ctx),
origin: posit,
alignment: AlignmentGeometry.lerp(null, null, 2));
},
transitionDuration: const Duration(milliseconds: 900),
);
}
}
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