import 'package:flutter/material.dart'; void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { Widget titleSection = Container( padding: const EdgeInsets.all(32), child: Row( children: [ Expanded( child: Column( crossAxisAlignme...
每一个widget都有一个自己的context对象。import 'package:flutter/material.dart'; void main() => runApp(StatelessApp()); class StatelessApp extends StatelessWidget { ///在build方法中通过嵌套其它Widget来构建UI,在构建过程中会递归的构建其嵌套的Widget @override Widget build(BuildContext context) { //...
Widget 组合,顾名思义,就是将各种 Flutter 的基础 Widget,进行不同的选择、组合拼装,来实现一个可以满足我们需求的、新的 Widget。Flutter 的基础 Widget 中,也有很多是通过组合来实现的。 我们看一个实例,实现一个自定义的 ToolBar: // 自定义一个ToolBar import'package:flutter/material.dart'; classToolBar...
import 'package:flutter/material.dart'; void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { Widget titleSection = Container( padding: const EdgeInsets.all(32), child: Row( children: [ Expanded( child: Column( crossAxisAlignme...
首先创建一个单独的dart文件来实现该自定义Widget,比如命名为custom_combined_widget.dart。 import 'package:flutter/material.dart'; class CustomCombinedWidget extends StatefulWidget { final IconData iconData; final String title; final GestureTapCallback onTap; ...
import 'package:widgetbook/widgetbook.dart'; import 'package:widgetbook_in_flutter_course/widgets/button.dart'; void main() { runApp(const HotReload()); } class HotReload extends StatelessWidget { const HotReload({Key? key}) : super(key: key); ...
import'dart:ui';import'package:flutter/cupertino.dart';import'package:flutter/material.dart';import'package:flutter_app/padding_row_column_expand/zfl_cell.dart';/// @Description TODOclassZFLExpandingWidgetextendsStatefulWidget{@override_ZFLExpandingWidgetStatecreateState()=>_ZFLExpandingWidgetState();}cla...
import'package:flutter/material.dart';voidmain(){runApp(MyApp());}classMyAppextendssStatelessWidget{@overrideWidgetbuild(BuildContextcontext){returnMateriaApp{title:"我是一个标题",home:Scaffold{appBar:AppBar{title:Text('appBar title'),elevation:30.0,//设置标题阴影},body:MyHome(),},theme:ThemeDa...
import 'package:provider/provider.dart'; void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { const MyApp({super.key}); @override Widget build(BuildContext context) { return ChangeNotifierProvider( create: (context) => MyAppState(), ...
import 'dart:math' as math;import 'package:flutter/widgets.dart';// 设置旋转角度final theta = math.pi / 4; // 旋转 45 度// 定义一个表示旋转变换的矩阵final matrix4 = Matrix4(1, 0, 0, 0,0, math.cos(theta), -math.sin(theta), 0,0, math.sin(theta), math.cos(theta), 0,0,...