lib\widget\selection\switch.dart /* * Switch - 开关 */import'package:flutter/cupertino.dart';import'package:flutter/material.dart';classSwitchDemoextendsStatefulWidget{ constSwitchDemo({Key? key}) :super(key: key);@override_SwitchDemoState createState() => _SwitchDemoState(); }class_SwitchDemo...
key}) :super(key: key);@overrideWidget build(BuildContext context) {// if/elsesample1();// switch/casesample2();// while/do-whilesample3();// for/forEachsample4();returnColumn(
复制 voidensureVisualUpdate(){switch(schedulerPhase){caseSchedulerPhase.idle:caseSchedulerPhase.postFrameCallbacks:scheduleFrame();return;caseSchedulerPhase.transientCallbacks:caseSchedulerPhase.midFrameMicrotasks:caseSchedulerPhase.persistentCallbacks:return;}} 函数ensureVisualUpdate()会判断当前调度所处的状态,如...
animate(animation)); })); Widget _animatedItemWid(index) { switch (index) { case 0: return Container(key: UniqueKey(), color: Colors.purpleAccent.withOpacity(0.4), width: 100, height: 100); break; case 1: return Container(key: UniqueKey(), color: Colors.green.withOpacity(0.4), ...
1.根据Widget树生成一个Element树,Element树中的节点都继承自Element类。 2.根据Element树生成Render树(渲染树),渲染树中的节点都继承自RenderObject类。 3.根据渲染树生成Layer树,然后上屏显示,Layer树中的节点都继承自Layer类。 以上是Flutter布局绘制的基本架构,那么问题来了,这几棵树是如何被关联起来的?关联起来...
voidensureVisualUpdate(){switch(schedulerPhase){caseSchedulerPhase.idle:caseSchedulerPhase.postFrameCallbacks:scheduleFrame();return;caseSchedulerPhase.transientCallbacks:caseSchedulerPhase.midFrameMicrotasks:caseSchedulerPhase.persistentCallbacks:return;}} ...
this.switchOutCurve = Curves.linear, // 切换隐藏时动画曲线 this.transitionBuilder = AnimatedSwitcher.defaultTransitionBuilder, // Widget 动画构造器 this.layoutBuilder = AnimatedSwitcher.defaultLayoutBuilder, // Widget 布局构造器 }) 分析源码可知,AnimatedSwitcher更加灵活,可自由设置切换动画之间显示隐藏动画效果;...
MaterialApp(initialRoute: '/',onGenerateRoute: (settings) {switch (settings.name) {case '/':return MaterialPageRoute(builder: (context) => HomePage());case '/new':final String data = settings.arguments as String;return MaterialPageRoute(builder: (context) => NewPage(data: data));default:...
SwitchListTile 【官方封装组件, 可以作为ListView的<Widget>[]的元素, 具有属性如下所示】 代码语言:javascript 复制 new SwitchListTile( //选中状态值 value: isChecked2, //点击后的回调 onChanged: ((bool value) { print('点击了SwitchListTile , 选中状态为: $value'); setState(() { isChecked2 = ...
void main() => runApp(_widgetForRoute(window.defaultRouteName)); Widget _widgetForRoute(String route) { switch (route) { case 'demo_app': return MyApp(); case 'version': return VersionPage(); default: return ErrorPage('Unknown route: $route'); } } ...