![](/img/trans.png)
[英]I want to show filter list in a container but its opening as a new screen in flutter. how i can do it?
[英]Flutter. How can I make container wider than screen?
我正在尝试为页面控制器创建视差背景。 为此目的,我需要创建一个比屏幕宽的背景图像。 我把它放在这样的容器里:
@override
Widget build(BuildContext context) {
return Material(
child: Stack(
children: [
Container(
width: 4000,
height: 250,
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage('assets/images/pizza_bg.png'),
fit: BoxFit.cover,
repeat: ImageRepeat.noRepeat
)
)
),
],
),
);
}
但问题是,无论我指定什么宽度,容器(当然还有图像)永远不会比屏幕更宽。 有可能吗? ps 我尝试使用 SizedBox 和 AspectRatio 小部件,它们都给出了相同的结果
试试这个,作为一个选择
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body: Stack(
children: [
SingleChildScrollView(
scrollDirection: Axis.horizontal,
child: Container(
width: 4000,
height: 250,
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage('assets/images/pizza_bg.png'),
fit: BoxFit.cover,
repeat: ImageRepeat.noRepeat,
),
),
),
),
],
),
),
);
}
}
您也可以禁用用户滚动并通过滚动控制器管理滚动位置
SingleChildScrollView(
scrollDirection: Axis.horizontal,
physics: const NeverScrollableScrollPhysics(),
controller: controller, // your ScrollController
child: Container(
width: 4000,
height: 250,
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage('images/pizza_bg.png'),
fit: BoxFit.cover,
repeat: ImageRepeat.noRepeat,
),
),
),
),
对于图像,您可以使用Transform.scale()
,如文档中所述。 使用您的示例:
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body: Stack(
children: [
Align(
alignment: Alignment.center,
child: Transform.scale(
scale: 10.0,
child: Container(
width: 400,
height: 25,
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage('assets/images/pizza_bg.png'),
fit: BoxFit.cover,
repeat: ImageRepeat.noRepeat,
),
),
),
),
),
],
),
),
);
}
}
如果要为比例设置动画,可以使用ScaleTransition()
, 在文档的此页面中进行了解释。 例如:
/// Flutter code sample for ScaleTransition
// The following code implements the [ScaleTransition] as seen in the video
// above:
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
/// This is the main application widget.
class MyApp extends StatelessWidget {
static const String _title = 'Flutter Code Sample';
@override
Widget build(BuildContext context) {
return MaterialApp(
title: _title,
home: MyStatefulWidget(),
);
}
}
/// This is the stateful widget that the main application instantiates.
class MyStatefulWidget extends StatefulWidget {
MyStatefulWidget({Key key}) : super(key: key);
@override
_MyStatefulWidgetState createState() => _MyStatefulWidgetState();
}
/// This is the private State class that goes with MyStatefulWidget.
/// AnimationControllers can be created with `vsync: this` because of TickerProviderStateMixin.
class _MyStatefulWidgetState extends State<MyStatefulWidget>
with TickerProviderStateMixin {
AnimationController _controller;
Animation<double> _animation;
@override
void initState() {
super.initState();
_controller = AnimationController(
duration: const Duration(seconds: 2),
vsync: this,
)..repeat(reverse: true);
_animation = CurvedAnimation(
parent: _controller,
curve: Curves.fastOutSlowIn,
);
}
@override
void dispose() {
super.dispose();
_controller.dispose();
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: ScaleTransition(
scale: _animation,
child: const Padding(
padding: EdgeInsets.all(8.0),
child: FlutterLogo(size: 150.0),
),
),
),
);
}
}
注意:为避免图像质量损失,请使用缩放后大小的图像或矢量图形作为源。
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