Flutter布局插件flexi的使用
Flutter布局插件flexi的使用
兼容性
Flexi | Flutter | Dart |
---|---|---|
Flexi 0.1.0 - 更新版本 | Flutter 2.0.0 - 更新版本 | Dart 2.12.0 - 更新版本 |
安装 - pubspec.yaml
dependencies:
flexi: <最新版本>
示例
示例 1 - 预定义布局
import 'package:flexi/flexi.dart';
import 'package:flutter/material.dart';
void main() {
runApp(const App());
}
class App extends StatelessWidget {
const App({Key? key}) : super(key: key);
[@override](/user/override)
Widget build(BuildContext context) =>
const MaterialApp(
title: 'Flexi 示例 - 预定义布局',
home: FlexContainer(
// 查看其他预定义布局:
// BootstrapLayout, CarbonLayout, RuleOfThirdsLayout 和 FluidLayout
layout: MaterialLayout(),
child: Scaffold(body: HomePage()),
),
);
}
class HomePage extends StatelessWidget {
const HomePage({Key? key}) : super(key: key);
[@override](/user/override)
Widget build(BuildContext context) =>
Center(child: Text(context.flexi.breakpoint.toString()));
}
示例 2 - 自定义布局
import 'dart:collection';
import 'package:flexi/flexi.dart';
// 定义自定义断点枚举
enum CustomBreakpointId { sm, md }
// 创建自定义断点类
class CustomBreakpoint extends Breakpoint<CustomBreakpointId> {
const CustomBreakpoint({
required CustomBreakpointId id,
required double minWidth,
}) : super(id: id, minWidth: minWidth);
}
// 创建自定义布局类
class CustomLayout extends Layout<CustomBreakpointId, CustomBreakpoint> {
const CustomLayout();
[@override](/user/override)
SplayTreeSet<CustomBreakpoint> get breakpoints =>
SplayTreeSet.from(<CustomBreakpoint>{
const CustomBreakpoint(id: CustomBreakpointId.sm, minWidth: 0),
const CustomBreakpoint(id: CustomBreakpointId.md, minWidth: 600),
});
[@override](/user/override)
LayoutFormat format(double containerWidth, [
double containerHeight = double.maxFinite,
]) =>
const LayoutFormat(
columns: 4,
gutter: 0,
leftMargin: 0,
topMargin: 0,
rightMargin: 0,
bottomMargin: 0,
);
}
更多关于Flutter布局插件flexi的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
1 回复
更多关于Flutter布局插件flexi的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
Flexi
是一个用于 Flutter 的布局插件,旨在简化复杂的布局设计。它提供了一种声明式的方式来构建灵活的布局,类似于 Flex
和 Wrap
,但具有更多的自定义选项和简化的 API。
安装 Flexi
首先,你需要在 pubspec.yaml
文件中添加 flexi
依赖:
dependencies:
flutter:
sdk: flutter
flexi: ^1.0.0 # 请检查最新版本
然后运行 flutter pub get
来安装依赖。
基本用法
Flexi
的核心是 Flexi
小部件,它允许你通过 children
属性来定义子组件,并通过 direction
、alignment
、spacing
等属性来控制布局。
1. 水平布局
import 'package:flutter/material.dart';
import 'package:flexi/flexi.dart';
class MyHomePage extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Flexi Example'),
),
body: Flexi(
direction: Axis.horizontal,
spacing: 8.0, // 子组件之间的间距
runSpacing: 8.0, // 行之间的间距(适用于多行布局)
alignment: FlexiAlignment.center,
children: [
Container(width: 50, height: 50, color: Colors.red),
Container(width: 50, height: 50, color: Colors.green),
Container(width: 50, height: 50, color: Colors.blue),
],
),
);
}
}
2. 垂直布局
Flexi(
direction: Axis.vertical,
spacing: 8.0,
runSpacing: 8.0,
alignment: FlexiAlignment.center,
children: [
Container(width: 50, height: 50, color: Colors.red),
Container(width: 50, height: 50, color: Colors.green),
Container(width: 50, height: 50, color: Colors.blue),
],
)
3. 自适应布局
Flexi
还支持自适应布局,可以根据屏幕宽度自动调整子组件的排列方式。
Flexi(
direction: Axis.horizontal,
spacing: 8.0,
runSpacing: 8.0,
alignment: FlexiAlignment.center,
wrap: true, // 允许换行
children: [
Container(width: 100, height: 50, color: Colors.red),
Container(width: 100, height: 50, color: Colors.green),
Container(width: 100, height: 50, color: Colors.blue),
Container(width: 100, height: 50, color: Colors.orange),
Container(width: 100, height: 50, color: Colors.purple),
],
)
自定义对齐方式
Flexi
提供了多种对齐方式,可以通过 alignment
属性来设置:
FlexiAlignment.start
FlexiAlignment.center
FlexiAlignment.end
FlexiAlignment.spaceBetween
FlexiAlignment.spaceAround
FlexiAlignment.spaceEvenly
Flexi(
direction: Axis.horizontal,
spacing: 8.0,
alignment: FlexiAlignment.spaceBetween,
children: [
Container(width: 50, height: 50, color: Colors.red),
Container(width: 50, height: 50, color: Colors.green),
Container(width: 50, height: 50, color: Colors.blue),
],
)
嵌套布局
你可以将 Flexi
嵌套使用,以创建更复杂的布局结构。
Flexi(
direction: Axis.vertical,
spacing: 16.0,
children: [
Flexi(
direction: Axis.horizontal,
spacing: 8.0,
children: [
Container(width: 50, height: 50, color: Colors.red),
Container(width: 50, height: 50, color: Colors.green),
],
),
Flexi(
direction: Axis.horizontal,
spacing: 8.0,
children: [
Container(width: 50, height: 50, color: Colors.blue),
Container(width: 50, height: 50, color: Colors.orange),
],
),
],
)