Flutter 仅使一个小部件浮动在键盘上方
我想在键盘上方显示一个可见的“关闭键盘”按钮 我知道resizeToAvoidBottomInset会影响键盘与应用程序其余部分的交互方式,但它并不能完全满足我的要求 我有一个背景图像和其他小部件(下面的示例中没有显示),当显示键盘时,这些小部件不应该调整大小,也不应该移动。当Flutter 仅使一个小部件浮动在键盘上方,flutter,keyboard,widget,floating,Flutter,Keyboard,Widget,Floating,我想在键盘上方显示一个可见的“关闭键盘”按钮 我知道resizeToAvoidBottomInset会影响键盘与应用程序其余部分的交互方式,但它并不能完全满足我的要求 我有一个背景图像和其他小部件(下面的示例中没有显示),当显示键盘时,这些小部件不应该调整大小,也不应该移动。当resizetoavidbottominset属性设置为false时,这是一个ok行为 但是,我想添加一个按钮,它应该出现在键盘上方 import 'dart:async'; import 'package:flutte
resizetoavidbottominset
属性设置为false时,这是一个ok行为
但是,我想添加一个按钮,它应该出现在键盘上方
import 'dart:async';
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
var home = MyHomePage(title: 'Flutter Demo Home Page');
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: home,
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
@override
Widget build(BuildContext context) {
return Scaffold(
resizeToAvoidBottomInset: false,
appBar: AppBar(
title: Text(widget.title),
),
body: _getBody(),
floatingActionButton: FloatingActionButton(
onPressed: () {},
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
Widget _getBody() {
return Stack(children: <Widget>[
Container(
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage("assets/sample.jpg"), fit: BoxFit.fitWidth)),
// color: Color.fromARGB(50, 200, 50, 20),
child: Column(
children: <Widget>[TextField()],
),
),
Positioned(
bottom: MediaQuery.of(context).viewInsets.bottom,
left: 0,
right: 0,
child: Container(
height: 50,
child: Text("Aboveeeeee"),
decoration: BoxDecoration(color: Colors.pink),
),
),
]);
}
}
我该怎么做?我只想在键盘上方浮动一个小部件,而不是所有的应用程序
下面是一个示例代码:
import 'dart:async';
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
var home = MyHomePage(title: 'Flutter Demo Home Page');
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: home,
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
@override
Widget build(BuildContext context) {
return Scaffold(
resizeToAvoidBottomInset: false,
appBar: AppBar(
title: Text(widget.title),
),
body: _getBody(),
floatingActionButton: FloatingActionButton(
onPressed: () {},
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
Widget _getBody() {
return Stack(children: <Widget>[
Container(
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage("assets/sample.jpg"), fit: BoxFit.fitWidth)),
// color: Color.fromARGB(50, 200, 50, 20),
child: Column(
children: <Widget>[TextField()],
),
),
Positioned(
bottom: 0,
left: 0,
right: 0,
child: Container(
height: 50,
child: Text("Aboveeeeee"),
decoration: BoxDecoration(color: Colors.pink),
),
),
]);
}
}
导入'dart:async';
进口“包装:颤振/材料.省道”;
void main()=>runApp(MyApp());
类MyApp扩展了无状态小部件{
@凌驾
小部件构建(构建上下文){
var home=MyHomePage(标题:“颤振演示主页”);
返回材料PP(
标题:“颤振演示”,
主题:主题数据(
主样本:颜色。蓝色,
),
家:家,
);
}
}
类MyHomePage扩展StatefulWidget{
MyHomePage({Key,this.title}):超级(Key:Key);
最后的字符串标题;
@凌驾
_MyHomePageState createState()=>\u MyHomePageState();
}
类_MyHomePageState扩展状态{
@凌驾
小部件构建(构建上下文){
返回脚手架(
resizeToAvoidBottomInset:false,
appBar:appBar(
标题:文本(widget.title),
),
正文:_getBody(),
浮动操作按钮:浮动操作按钮(
按下:(){},
工具提示:“增量”,
子:图标(Icons.add),
),
);
}
小部件_getBody(){
返回堆栈(子级:[
容器(
装饰:盒子装饰(
图像:装饰图像(
图像:AssetImage(“assets/sample.jpg”),fit:BoxFit.fitWidth),
//颜色:颜色。来自argb(50,200,50,20),
子:列(
子项:[TextField()],
),
),
定位(
底部:0,
左:0,,
右:0,,
子:容器(
身高:50,
子项:文本(“上文”),
装饰:盒子装饰(颜色:彩色。粉色),
),
),
]);
}
}
选中此项,它会在键盘上方显示一个“取消”按钮。您的定位的小部件底部的值为0,替换为适当的值应该可以完成此任务
import 'dart:async';
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
var home = MyHomePage(title: 'Flutter Demo Home Page');
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: home,
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
@override
Widget build(BuildContext context) {
return Scaffold(
resizeToAvoidBottomInset: false,
appBar: AppBar(
title: Text(widget.title),
),
body: _getBody(),
floatingActionButton: FloatingActionButton(
onPressed: () {},
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
Widget _getBody() {
return Stack(children: <Widget>[
Container(
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage("assets/sample.jpg"), fit: BoxFit.fitWidth)),
// color: Color.fromARGB(50, 200, 50, 20),
child: Column(
children: <Widget>[TextField()],
),
),
Positioned(
bottom: MediaQuery.of(context).viewInsets.bottom,
left: 0,
right: 0,
child: Container(
height: 50,
child: Text("Aboveeeeee"),
decoration: BoxDecoration(color: Colors.pink),
),
),
]);
}
}
MediaQuery.of(context).viewInsets.bottom
将为您提供系统UI(在本例中为键盘)覆盖的高度值
导入'dart:async';
进口“包装:颤振/材料.省道”;
void main()=>runApp(MyApp());
类MyApp扩展了无状态小部件{
@凌驾
小部件构建(构建上下文){
var home=MyHomePage(标题:“颤振演示主页”);
返回材料PP(
标题:“颤振演示”,
主题:主题数据(
主样本:颜色。蓝色,
),
家:家,
);
}
}
类MyHomePage扩展StatefulWidget{
MyHomePage({Key,this.title}):超级(Key:Key);
最后的字符串标题;
@凌驾
_MyHomePageState createState()=>\u MyHomePageState();
}
类_MyHomePageState扩展状态{
@凌驾
小部件构建(构建上下文){
返回脚手架(
resizeToAvoidBottomInset:false,
appBar:appBar(
标题:文本(widget.title),
),
正文:_getBody(),
浮动操作按钮:浮动操作按钮(
按下:(){},
工具提示:“增量”,
子:图标(Icons.add),
),
);
}
小部件_getBody(){
返回堆栈(子级:[
容器(
装饰:盒子装饰(
图像:装饰图像(
图像:AssetImage(“assets/sample.jpg”),fit:BoxFit.fitWidth),
//颜色:颜色。来自argb(50,200,50,20),
子:列(
子项:[TextField()],
),
),
定位(
底部:MediaQuery.of(context).viewInsets.bottom,
左:0,,
右:0,,
子:容器(
身高:50,
子项:文本(“上文”),
装饰:盒子装饰(颜色:彩色。粉色),
),
),
]);
}
}
为了实现基于键盘可视性的动画填充,以下是对@10101010伟大答案的一些修改:
如果要在键盘将可见性更改为动画时更改底部
,并且要在浮动子项下添加额外的填充,则:
1-使用颤振酒吧
要在键盘出现/消失时收听,请执行以下操作:
bool isKeyboardVisible = false;
@override
void initState() {
super.initState();
KeyboardVisibilityNotification().addNewListener(
onChange: (bool visible) {
isKeyboardVisible = visible;
},
);
}
Widget _getBody() {
double bottomPadding = 0;
if (isKeyboardVisible) {
// when keyboard is shown, our floating widget is above the keyboard and its accessories by `16`
bottomPadding = MediaQuery.of(context).viewInsets.bottom + 16;
} else {
// when keyboard is hidden, we should have default spacing
bottomPadding = 48; // MediaQuery.of(context).size.height * 0.15;
}
return Stack(children: <Widget>[
Container(
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage("assets/sample.jpg"), fit: BoxFit.fitWidth)),
// color: Color.fromARGB(50, 200, 50, 20),
child: Column(
children: <Widget>[TextField()],
),
),
AnimatedPositioned(
duration: Duration(milliseconds: 500),
bottom: bottomPadding,
left: 0,
right: 0,
child: Container(
height: 50,
child: Text("Aboveeeeee"),
decoration: BoxDecoration(color: Colors.pink),
),
),
]);
}
您可以选择编写自己的本机插件,但它已经在那里,您可以查看酒吧的git repo
2-使用动画发布中的可见性标志
:
对于微调的动画填充,如下所示:
bool isKeyboardVisible = false;
@override
void initState() {
super.initState();
KeyboardVisibilityNotification().addNewListener(
onChange: (bool visible) {
isKeyboardVisible = visible;
},
);
}
Widget _getBody() {
double bottomPadding = 0;
if (isKeyboardVisible) {
// when keyboard is shown, our floating widget is above the keyboard and its accessories by `16`
bottomPadding = MediaQuery.of(context).viewInsets.bottom + 16;
} else {
// when keyboard is hidden, we should have default spacing
bottomPadding = 48; // MediaQuery.of(context).size.height * 0.15;
}
return Stack(children: <Widget>[
Container(
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage("assets/sample.jpg"), fit: BoxFit.fitWidth)),
// color: Color.fromARGB(50, 200, 50, 20),
child: Column(
children: <Widget>[TextField()],
),
),
AnimatedPositioned(
duration: Duration(milliseconds: 500),
bottom: bottomPadding,
left: 0,
right: 0,
child: Container(
height: 50,
child: Text("Aboveeeeee"),
decoration: BoxDecoration(color: Colors.pink),
),
),
]);
}
Widget\u getBody(){
双层底填充=0;
如果(isKeyboardVisible){
//当显示键盘时,我们的浮动小部件位于键盘及其附件上方16度`
bottomPadding=MediaQuery.of(context).viewInsets.bottom+16;
}否则{
//当键盘被隐藏时,我们应该有默认的间距
bottomPadding=48;//MediaQuery.of(context).size.height*0.15;
}
返回堆栈(子级:[
容器(
装饰:盒子装饰(
图像:装饰图像(
图像:AssetImage(“assets/sample.jpg”),fit:BoxFit.fitWidth),
//颜色:颜色。来自argb(50,200,50,20),
子:列(
子项:[TextField()],
),
),
动画定位(
持续时间:持续时间(毫秒:500),
底部:底部填充,
左:0,,
右:0,,
子:容器(
身高:50,
子项:文本(“上文”),
装饰:盒子装饰(颜色:彩色。粉色),
),
),
]);
}