forked from lxm_flutter/FlutterUnit
93 lines
2.7 KiB
Dart
93 lines
2.7 KiB
Dart
import 'package:flutter/material.dart';
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/// create by 张风捷特烈 on 2020/6/6
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/// contact me by email 1981462002@qq.com
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/// 说明:
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// {
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// "widgetId": 315,
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// "name": 'LayoutId使用场景',
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// "priority": 1,
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// "subtitle":
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// "【id】 : 标识id 【Object】\n"
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// "【child】 : 子组件 【Widget】",
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// }
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class LayoutIdDemo extends StatelessWidget {
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@override
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Widget build(BuildContext context) {
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return Container(
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width: 300,
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height: 150,
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color: Colors.grey.withAlpha(33),
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child: CustomMultiChildLayout(
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delegate: CornerCustomMultiChildLayout(
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padding:EdgeInsets.only(left: 10,top: 5,right: 10,bottom: 5),
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),
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children: [
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LayoutId(id: CornerType.topLeft, child: Box50(Colors.red)),
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LayoutId(id: CornerType.topRight, child: Box50(Colors.yellow)),
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LayoutId(id: CornerType.bottomLeft, child: Box50(Colors.blue)),
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LayoutId(id: CornerType.bottomRight, child: Box50(Colors.green)),
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],
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),
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);
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}
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}
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// 50 颜射盒
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class Box50 extends StatelessWidget {
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final Color color;
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Box50(this.color);
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@override
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Widget build(BuildContext context) {
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return Container(
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width: 50,
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height: 50,
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color: color,
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);
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}
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}
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enum CornerType{
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topLeft,
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topRight,
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bottomLeft,
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bottomRight
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}
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class CornerCustomMultiChildLayout extends MultiChildLayoutDelegate{
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final EdgeInsets padding;
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CornerCustomMultiChildLayout({this.padding = EdgeInsets.zero});
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@override
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void performLayout(Size size) {
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if (hasChild(CornerType.topLeft)) {
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layoutChild(CornerType.topLeft, BoxConstraints.loose(size));
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positionChild(CornerType.topLeft, Offset.zero.translate(padding.left, padding.top));
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}
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if (hasChild(CornerType.topRight)) {
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var childSize = layoutChild(CornerType.topRight, BoxConstraints.loose(size));
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positionChild(CornerType.topRight, Offset(size.width-childSize.width,0).translate(-padding.right, padding.top));
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}
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if (hasChild(CornerType.bottomLeft)) {
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var childSize = layoutChild(CornerType.bottomLeft, BoxConstraints.loose(size));
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positionChild(CornerType.bottomLeft, Offset(0,size.height-childSize.height).translate(padding.left, -padding.bottom));
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}
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if (hasChild(CornerType.bottomRight)) {
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var childSize = layoutChild(CornerType.bottomRight, BoxConstraints.loose(size));
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positionChild(CornerType.bottomRight, Offset(size.width-childSize.width,size.height-childSize.height).translate(-padding.right, -padding.bottom));
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}
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}
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@override
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bool shouldRelayout(CornerCustomMultiChildLayout oldDelegate) => oldDelegate.padding!=padding;
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}
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