import'package:flutter/material.dart';classGetWidgetWidthAndHeigetextendsStatelessWidget{@overrideWidget build(BuildContext context) {finalsize =MediaQuery.of(context).size;finalwidth =size.width;finalheight =size.height;print('width is$width; height is$height');returnMaterialApp( home: Scaffold( appBar...
import'package:flutter/material.dart';classGetWidgetWidthAndHeigetextendsStatelessWidget{ @override Widgetbuild(BuildContext context) {finalsize =MediaQuery.of(context).size;finalwidth =size.width;finalheight =size.height;print('width is $width; height is $height');returnMaterialApp(home:Scaffold(appBar...
import'package:flutter/material.dart';classGetWidgetWidthAndHeigetextendsStatelessWidget{@overrideWidgetbuild(BuildContext context){finalsize=MediaQuery.of(context).size;finalwidth=size.width;finalheight=size.height;print('width is $width; height is $height');returnMaterialApp(home:Scaffold(appBar:AppBar(...
在代码中,我们是想获取屏幕的宽和高,然后将屏幕宽高的一半分别赋值给 Container 的宽和高,但上述代码并不能成功运行,会报如下错误: flutter: The following assertion was thrown building GetWidgetWidthAndHeiget(dirty): flutter: MediaQuery.of() called with a context that does not contain a MediaQuery. ...
对于基于RenderBox的盒模型布局,如Container,可以通过如下方法得到widget的大小。 finalRenderBox renderBox=boxKey?.currentContext?.findRenderObject();finalboxHeight=renderBox?.size?.height??0.0;finalboxWidth=renderBox?.size?.width??0.0; 对于基于Sliver的按需加载列表布局,如SliverList,可以通过如下方法得到sliver可...
Size _widgetSize = Size.zero; Widget build(BuildContext context){ Offset o = Offset(_widgetSize.size.width/2, _widgetSize.size.height/2); returnTransform.translate( offset: o, child: MeasurableWidget(child: ..., onSized: _handleWidgetSized); ...
Flutter中获取设备的宽度和高度 Flutter中获取设备的宽度和高度的方法如下 Widgetbuild(BuildContextcontext){// ScreenUtil.instance = ScreenUtil(width: 750, height: 1334)..init(context);finalsize=MediaQuery.of(context).size;finalwidth=size.width;finalheight=size.height;}...
在Flutter中,可以使用`Container`组件来动态设置widget的高度。`Container`是一个常用的布局组件,它可以包含一个子widget,并且可以通过设置`height`属性来动态...
通常会设置input decoration的isCollapsed和isDense，再把padding置为zero，这样能够让widget的外包围仅包裹...
widget.focusNode.dispose(); _animationController.dispose(); super.dispose(); } void onItemDelete(int i) { widget.addresseeList.value.removeAt(i); widget.addresseeList.value = [...widget.addresseeList.value]; } // 点击键盘完成按钮的回调 ...