import'dart:developer';import'package:flutter/material.dart';import'package:flutter/rendering.dart';voidmain(){runApp(MyApp());}classMyAppextendsStatelessWidget{@overrideWidgetbuild(BuildContext context){returnMaterialApp(title:'SizeDemo',theme:ThemeData(primarySwatch:Colors.blue,visualDensity:VisualDensity....
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...
地址:https://api.flutter.dev/flutter/widgets/Stack-class.html 十七、Wrap 在多个水平或垂直行中显示其子级的窗口widget。 视频地址:https://api.flutter.dev/flutter/widgets/Wrap-class.html 十八、Table 使用表布局算法为其子项的widget。 视频地址:https://api.flutter.dev/flutter/widgets/Table-class.html...
要想获取Widget的大小和位置信息可以通过GlobalKey方法,举一个例子。 import'package:flutter/cupertino.dart';import'package:flutter/material.dart';classGlobalKeyTestextendsStatelessWidget{@overrideWidgetbuild(BuildContext context){GlobalKey globalKey=GlobalKey();returnScaffold(appBar:AppBar(title:Text('GlobalKeyTest...
只需要在页面顶层套一个组件 onNotification:(notification){if(_topAppbarHei==0){setState((){_topAppbarHei=_appbarGlogbalKey.currentContext.size.height+MediaQueryData.fromWindow(window).padding.top;_initImagesTopHei=getY(_detailImagesGlogbalKey.currentContext);// 获取widget到屏幕顶部的距离});add...
我们平时在开发中的过程中通常都会获取屏幕或者 widget 的宽高用来做一些事情,在 Flutter 中,我们可以使用如下方法来获取屏幕或者 widget 的宽高。 MediaQuery 一般情况下,我们会使用如下方式去获取 widget 的宽高: finalsize=MediaQuery.of(context).size;finalwidth=size.width;finalheight=size.height;复制代码 ...