本文介绍了在Flutter中禁用文本编辑字段的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我需要偶尔禁用TextFormField。我在窗口小部件或控制器中找不到标记,使其仅是只读或禁用。
最好的方法是什么?
解决方案
此功能目前不是由框架,但您可以使用
(具有只读值)
此处是启用后的样子。
(有焦点)
(无焦点)
此代码如下:
import'package:flutter / material.dart';
void main(){
runApp(new MaterialApp(
home:new HomePage(),
));
}
类HomePage扩展了StatefulWidget {
HomePageState createState()=>新的HomePageState();
}
类HomePageState扩展了State< HomePage> {
TextEditingController _controller = new TextEditingController();
bool _enabled = false;
@override
小部件构建(BuildContext上下文){
ThemeData theme = Theme.of(context);
返回新的Scaffold(
appBar:新的AppBar(
标题:new Text('Disabled Text'),
),
floatActionButton:new FloatingActionButton(
孩子:new Icon(Icons.free_breakfast),
onPressed:(){
setState((){
_enabled =!_enabled;
});
}
),
主体:new Center(
子代:new Container(
保证金:const EdgeInsets.all(10.0)),
子代:_enabled?
new TextFormField(controller:_controller):
new FocusScope(
node:new FocusScopeNode(),
child:new TextFormField(
controller:_controller,
style:theme .textTheme.subhead.copyWith(
color:theme.disabledColor,
),
装饰:new InputDecoration(
hintText:_enabled?'Type something':'You ca不关注我,
),
),
),
),
),
);
}
}
I need to disable TextFormField occasionally. I couldn't find a flag in the widget, or the controller to simply make it read only or disable.What is the best way to do it?
解决方案
This isn't a feature that is currently provided by the framework, but you can use a FocusScope
to prevent a TextFormField
from requesting focus.
Here's what it looks like when it's disabled.
(with hint text)
(with a readonly value)
Here's what it looks like when it's enabled.
(with focus)
(without focus)
Code for this is below:
import 'package:flutter/material.dart';
void main() {
runApp(new MaterialApp(
home: new HomePage(),
));
}
class HomePage extends StatefulWidget {
HomePageState createState() => new HomePageState();
}
class HomePageState extends State<HomePage> {
TextEditingController _controller = new TextEditingController();
bool _enabled = false;
@override
Widget build(BuildContext context) {
ThemeData theme = Theme.of(context);
return new Scaffold(
appBar: new AppBar(
title: new Text('Disabled Text'),
),
floatingActionButton: new FloatingActionButton(
child: new Icon(Icons.free_breakfast),
onPressed: () {
setState(() {
_enabled = !_enabled;
});
}
),
body: new Center(
child: new Container(
margin: const EdgeInsets.all(10.0),
child: _enabled ?
new TextFormField(controller: _controller) :
new FocusScope(
node: new FocusScopeNode(),
child: new TextFormField(
controller: _controller,
style: theme.textTheme.subhead.copyWith(
color: theme.disabledColor,
),
decoration: new InputDecoration(
hintText: _enabled ? 'Type something' : 'You cannot focus me',
),
),
),
),
),
);
}
}
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