Flutter之Flex组件布局

目录

Flex属性值

轴向:direction:Axis.horizontal

主轴方向:mainAxisAlignment:MainAxisAlignment.center

交叉轴方向:crossAxisAlignment:CrossAxisAlignment

主轴尺寸:mainAxisSize

文字方向:textDirection:TextDirection

竖直方向排序:verticalDirection:VerticalDirection

基线对齐方式:textBaseline:TextBaseline

使用方法

第一种写法

第二种写法 

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Flex属性值

 

轴向:direction:Axis.horizontal

enum Axis {
  horizontal,//水平
  vertical,//竖直
}

主轴方向:mainAxisAlignment:MainAxisAlignment.center

enum MainAxisAlignment {
  start,//顶头
  end,//接尾
  center,//居中
  spaceBetween,//顶头接尾，其他均分
  spaceAround,//中间的孩子均分,两头的孩子空一半
  spaceEvenly,//均匀平分
  }

交叉轴方向:crossAxisAlignment:CrossAxisAlignment

enum CrossAxisAlignment {
  start,//顶头
  end,//接尾
  center,//居中
  stretch,//伸展
  baseline,//基线
}

主轴尺寸:mainAxisSize

enum MainAxisSize {
  min,
  max,
}

文字方向:textDirection:TextDirection

enum TextDirection {
  ltr,//从左到右
  rtl,//从右到左
}

竖直方向排序:verticalDirection:VerticalDirection

enum VerticalDirection{
    up,
    down,
}

基线对齐方式:textBaseline:TextBaseline

enum TextBaseline {
  alphabetic,
  ideographic,
}

 

使用方法

第一种写法

Column(
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            Flexible(
              flex: 1,
              child: Container(
                color: Colors.red,
                width: 100, // 宽度固定
                height: double.infinity, // 纵向填满
              ),
            ),
            Flexible(
              flex: 2,
              child: Container(
                color: Colors.blue,
                width: 100,
                height: double.infinity,
              ),
            ),
          ],
        )

第二种写法 

import 'dart:async';
 
import 'package:flutter/material.dart';
import 'package:flutter_diancan/pages/layout/login_page.dart';
import 'package:flutter_diancan/pages/home/home_page.dart';
import 'package:flutter_diancan/stores/user_store.dart';
import 'package:provider/provider.dart';
 
class Startpage extends StatelessWidget {
  const Startpage({super.key});
 
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          centerTitle: true,
          title: Text("首页"),
        ),
        body: Center(child: testFlex()));
  }
 
  testFlex() {
    var redBox = Container(
      color: Colors.red,
      height: 80,
      width: double.infinity,
      child: const Text("红"),
    );
 
    var blueBox = Container(
      color: Colors.blue,
      height: 80,
      width: double.infinity,
      child: const Text("蓝"),
    );
 
    var yellowBox = Container(
      color: Colors.yellow,
      height: 80,
      width: double.infinity,
      child: const Text("黄"),
    );
 
    var greenBox = Container(
      color: Colors.green,
      height: 80,
      width: double.infinity,
      child: const Text("绿"),
    );
 
    var show = Flex(
      direction: Axis.vertical,
      crossAxisAlignment: CrossAxisAlignment.start,
      textBaseline: TextBaseline.alphabetic,
      mainAxisAlignment: MainAxisAlignment.center,
      children: <Widget>[redBox, blueBox, yellowBox, greenBox],
      mainAxisSize: MainAxisSize.max,
    );
    return show;
  }
}