RenderAbstractViewport viewport=RenderAbstractViewport.of(renderObject);/// Distance between top edge of screen and MyWidget bottom edgevaroffsetToRevealLeading=viewport.getOffsetToReveal(renderObject,0.0);/// Distance between bottom edge of screen and MyWidget top edgevaroffsetToRevealTrailingEdge=viewpor...
从flutter的架构图中可以看出来widget是整个视图描述的基础。Flutter的核心设计思想便是一切为Widget。在flutter的世界里,包括views,view,controller是,layouts等在内的观念都建立在Widget之上。widget是flutter功能的抽象描述。 需要学习Flutter就需要从Widget开始。 Flutter主要提供UI控制布局的基础知识,首先列出UI开发最为常...
MaterialPageRoute(builder: (context) => Number())); Scaffold.of(context).showSnackBar(SnackBar(content: Text('$result'))); } } class Number extends StatelessWidget { @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar(title: Text('我是你找的数')), body: Cente...
Widget build(BuildContext context) { return SimpleHiddenDrawer( menu:Menu(), //抽屉区域布局 screenSelectedBuilder: (position,controller) { return Scaffold( //页面主体区域 appBar: AppBar( title: Text("hidden_drawer_menu"), ), body: Column( mainAxisAlignment: MainAxisAlignment.center, children: ...
Widget build(BuildContext context) { //设置适配尺寸 (填入设计稿中设备的屏幕尺寸) 假如设计稿是按iPhone6的尺寸设计的(iPhone6 750*1334) ScreenUtil.instance = ScreenUtil(width: 750, height: 1334)..init(context); print('设备宽度:${ScreenUtil.screenWidth}'); //Device width ...
final Widget child; @override Widget build(BuildContext context) { return Container( width: ScreenUtil().screenWidth, height: ScreenUtil().screenHeight, // android伪全屏,加入边距 padding: EdgeInsets.symmetric(horizontal: 374.w, vertical: 173.h), ...
Each child of a Stack widget is either positioned or non-positioned. Positioned children are those wrapped in a Positioned widget that has at least one non-null property. The stack sizes itself to contain all the non-positioned children, which are positioned according to alignment. ...
{@overrideWidgetbuild(BuildContextcontext){returnScaffold(appBar:AppBar(title:Text("基础widget")),body:Center(child:Column(children:[Text("Hello World!!"),Text("Hello World!!",style:Theme.of(context).textTheme.bodyText1,),Text("Hello World!!",style:Theme.of(context).textTheme.bodyText2,...
alignment: Alignment.center, // 子组件, 子组件设置为一个 Column 组件 child: Column( // Column 子组件, 这里设置 Text 文本组件 children: <Widget>[ // Text 文本组件 // textStyle 是之前创建的 TextStyle textStyle 对象 Text('Container 中的 Text 文本组件示例', style: textStyle,), ...
函数MediaQuery.of(context).devicPixelRatio将返回每个逻辑像素的实际像素数，因此您将确保测试设备上相同...