11Flutter页面布局 Stack层叠组件 Stack与Align Stack与Positioned实现定位布局

/*
  Flutter 页面布局 Stack层叠组件:
  Stack与Align Stack与Positioned实现定位布局:
  Flutter Stack组件:
  Stack表示堆得意思,我们可以用Stack或者Stack结合Align或者Stack结合Positiond来实现页面的定位布局:
  alignent 配置所有子元素的显示位置。
  children 子组件

  Flutter Stack Align
  Stack组件中结合Align组件可以控制每个子元素的显示位置。
  
*/

Stack与Align实现定位布局:

效果图:

main.dart

import 'package:flutter/material.dart';
void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Padding Row Column Expanded'),
        ),
        body: HomeContent(),
      ),
    );
  }
}

class HomeContent extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    //Stack结合align实现布局:
    return Center(
      child: Container(
        width: 300.0,
        height: 400.0,
        color: Colors.red,
        child: Stack(
          children: <Widget>[
            Align(
              alignment: Alignment.topLeft,
              child: Icon(Icons.home, color: Colors.white,size: 40),
            ),
            Align(
              alignment: Alignment.center,
              child: Icon(Icons.search, color: Colors.white,size: 40),
            ),
            Align(
              alignment: Alignment.bottomRight,
              child: Icon(Icons.select_all, color: Colors.white,size: 40),
            ),
          ],
        ),
      ),
    );
  }
}

Stack与Positioned

效果图:

main.dart

import 'package:flutter/material.dart';
void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Padding Row Column Expanded'),
        ),
        body: HomeContent(),
      ),
    );
  }
}

class HomeContent extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    //Stack结合align实现布局:
    return Center(
      child: Container(
        width: 300.0,
        height: 400.0,
        color: Colors.red,
        child: Stack(
          children: <Widget>[
            Positioned(
              top: 0,
              right: 10,
              child: Icon(Icons.home, color: Colors.white,size: 40),
            ),
            Positioned(
              top: 10,
              left: 10,
              child: Icon(Icons.search, color: Colors.white,size: 40),
            ),
            Positioned(
              bottom: 10,
              right: 20,
              child: Icon(Icons.select_all, color: Colors.white,size: 40),
            ),
          ],
        
        ),
      ),
    );
  }
}

 

posted @ 2019-09-03 11:25  生如逆旅,一苇以航  阅读(2329)  评论(0编辑  收藏  举报