Flutter基础widgets教程-Transform篇

1 Transform

在绘制子widget之前应用转换的widget

2 构造函数

       Transform({
           Key key,
           @required this.transform,
           this.origin,
           this.alignment,
           this.transformHitTests = true,
           Widget child,
       })
   
  

3 常用属性

3.1 origin：指定子组件做平移、旋转、缩放时的中心点

origin: Offset(50, 50),
  

3.2 alignment：对齐方式

alignment:Alignment.center,
  

3.2.1 顶部左边

alignment:Alignment.topLeft,
  

3.2.2 顶部中间

alignment:Alignment.topCenter,
  

3.2.3 顶部右边

alignment:Alignment.topRight,
  

3.2.4 中部左边

alignment:Alignment.centerLeft,
  

3.2.5 中部中间

alignment:Alignment.center,
  

3.2.6 中部右边

alignment:Alignment.centerRight,
  

3.2.7 底部左边

alignment:Alignment.bottomLeft,
  

3.2.8 底部中间

alignment:Alignment.bottomCenter,
  

3.2.9 底部右边

alignment:Alignment.bottomRight,
  

3.3 transformHitTests：点击区域是否也做相应的变换,为true时执行相应的变换,为false不执行

transformHitTests:true,
  

3.4 transform：控制子组件的平移、旋转、缩放、倾斜变换

transform: Matrix4.rotationX(radian),
  

3.4.1 旋转

       transform: Matrix4.rotationX(radian),
       transform: Matrix4.rotationY(radian),
       transform: Matrix4.rotationZ(radian),
   
  

3.4.2 平移

       transform:Matrix4.translation(Vector3(x, y, z)),
       transform:Matrix4.translation(Vector3.all(val)),
       transform:Matrix4.translationValues(x, y, z),
   
  

3.4.3 缩放

       transform:Matrix4.diagonal3(Vector3(x, y, z)),
       transform:Matrix4.diagonal3(Vector3.all(val)),
       transform:Matrix4.diagonal3Values(x, y, z),
   
  

3.4.4 倾斜

       transform:Matrix4.skewX(alpha),
       transform:Matrix4.skewY(double beta),
       transform:Matrix4.skew(alpha, beta),
   
  

3.5 child：子widget

child: Text('你好 Flutter'),
  

4.显示效果

5.代码

       import 'package:flutter/material.dart';
       import 'package:flutter/services.dart';
       import 'package:flutter_markdown/flutter_markdown.dart';
       // 字体适配
       import '../../utils/app_size.dart';
       class ListTransform extends StatelessWidget {
         @override
         Widget build(BuildContext context) {
          return DefaultTabController(
             length: 2,
             child: Scaffold(
               appBar: AppBar(
                 title: Text('Transform'),
                 backgroundColor: Color(0xFFfafcff),
                 bottom: TabBar(labelColor: Color(0xff030303), tabs: [
                   Tab(
                     text: "效果",
                   ),
                   Tab(
                     text: "属性",
                   )
                 ]),
               ),
               body: TabBarView(children: [
                 Container(
                     decoration: new BoxDecoration(
                       color: new Color(0xffffffff),
                       borderRadius: new BorderRadius.circular((AppSize.width(20))),
                     ),
                     child: ShowEffect()),
                 Container(
                     decoration: new BoxDecoration(
                       color: new Color(0xffffffff),
                       borderRadius: new BorderRadius.circular((AppSize.width(20))),
                     ),
                     child: ShowAttribute()),
               ]),
             ),
           );
         }
       }
       // 效果
       class ShowEffect extends StatelessWidget {
         @override
         Widget build(BuildContext context) {
          return MaterialApp(
             home: Scaffold(
               appBar: AppBar(
                 title: Text("Transform"),
               ),
               body: Center(
                 child: Container(
                   color: Colors.black,
                   child: new Transform(
                     alignment: Alignment.topRight, //相对于坐标系原点的对齐方式
                     transform: new Matrix4.skewY(0.3), //沿Y轴倾斜0.3弧度
                     child: new Container(
                       padding: const EdgeInsets.all(8.0),
                       color: Colors.deepOrange,
                       child: const Text('转换的widget'),
                     ),
                   ),
                 ),
               ),
             ),
           );
         }
       }
       // 属性
       class ShowAttribute extends StatelessWidget {
         @override
         Widget build(BuildContext context) {
          return Container(
             child: FutureBuilder(
               future: rootBundle.loadString('lib/markdown/transform.md'),
               builder: (BuildContext context, AsyncSnapshot snapshot) {
                if (snapshot.hasData) {
                  return Markdown(
                     data: snapshot.data,
                     selectable: true,
                   );
                 } else {
                  return Center(
                     child: Text("加载中..."),
                   );
                 }
               },
             ),
           );
         }
       }
   
  

   
  
  

此代码已共享到码云，已对60多种widget做演示及解释。一直更新中

https://gitee.com/nmgwap/flutter_app