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本篇内容介绍了“怎么用flutter_staggered_grid_view实现分页瀑布流效果”的有关知识,在实际案例的操作过程中,不少人都会遇到这样的困境,接下来就让小编带领大家学习一下如何处理这些情况吧!希望大家仔细阅读,能够学有所成!
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1.前言的话
GridView是一个可滚动的,2D数组控件可以用这个组件实现滚动效果,但是它渲染的高度是一样的。
如果要实现不同高度的滚动瀑布流,就要使用这个插件:
flutter_staggered_grid_view
说明:配置pubspec.yaml文件,最好要使用0.3.2版本以上,此时flutter版本需要1.17以上的支持
因为低版本的插件支持并不友好
flutter_staggered_grid_view: ^0.3.2
如果组件无法滑动,可能就是版本的问题导致
2.插件的git地址
https://github.com/letsar/flutter_staggered_grid_view
在使用的flutter组件中导入这个插件
import 'package:flutter_staggered_grid_view/flutter_staggered_grid_view.dart';
3.效果体验
new StaggeredGridView.countBuilder( crossAxisCount: 4, itemCount: 8, itemBuilder: (BuildContext context, int index) => new Container( color: Colors.green, child: new Center( child: new CircleAvatar( backgroundColor: Colors.white, child: new Text('$index'), ), )), staggeredTileBuilder: (int index) => new StaggeredTile.count(2, index.isEven ? 2 : 1), mainAxisSpacing: 4.0, crossAxisSpacing: 4.0, )
4.配合RefreshIndicator实现下拉刷新
CustomScrollView( controller: _scrollController, slivers:[ SliverToBoxAdapter( child: RefreshIndicator( onRefresh: () async { await Future.delayed(Duration(seconds: 5)); }, child: StaggeredGridView.countBuilder( shrinkWrap: true, controller: _scrollController, crossAxisCount: 4, crossAxisSpacing: 4, mainAxisSpacing: 10, itemCount: _count, itemBuilder: (context, index) { return Container( color: Colors.green, child: new Center( child: new CircleAvatar( backgroundColor: Colors.white, child: new Text('$index'), ), )); }, staggeredTileBuilder: (index) => StaggeredTile.count(2, index == 0 ? 2.5 : 3)), ), ), ], ))
5.六种创建方式和属性
StaggeredGridView.count
和StaggeredGridView.extent
,前者创建了一个纵轴方向固定Tile个数的布局,后者只是在纵轴方法指定了一个Tile个数的最大值,这两种都是适合子Widget个数比较少的情况,都是List
StaggeredGridView.countBuilder
和StaggeredGridView.extentBuild
,这两个跟上面的含义差不多,区别在于适合子Widget数量比较多的需要动态创建的情况
更高级的还有StaggeredGridView.builder
和StaggeredGridView.custom
,区别在于创建的方式不同,而且也更加灵活
StaggeredTile.count:固定纵轴和主轴上的数量
StaggeredTile.extent:纵轴上的数量和主轴上的最大范围
StaggeredTile.fit:纵轴上的数量
StaggeredGridView有几列是由crossAxisCount除以StaggeredTile设置上的纵轴的数量的结果
import 'dart:math'; import 'dart:typed_data'; import 'package:flutter/material.dart'; import 'package:dio/dio.dart'; import 'package:flutter_staggered_grid_view/flutter_staggered_grid_view.dart'; final Uint8List kTransparentImage = new Uint8List.fromList([ 0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A, 0x00, 0x00, 0x00, 0x0D, 0x49, 0x48, 0x44, 0x52, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x08, 0x06, 0x00, 0x00, 0x00, 0x1F, 0x15, 0xC4, 0x89, 0x00, 0x00, 0x00, 0x0A, 0x49, 0x44, 0x41, 0x54, 0x78, 0x9C, 0x63, 0x00, 0x01, 0x00, 0x00, 0x05, 0x00, 0x01, 0x0D, 0x0A, 0x2D, 0xB4, 0x00, 0x00, 0x00, 0x00, 0x49, 0x45, 0x4E, 0x44, 0xAE, ]); List _createSizes(int count) { Random rnd = new Random(); return new List.generate(count, (i) => new IntSize((rnd.nextInt(500) + 200), rnd.nextInt(800) + 200)); } class Example08 extends StatefulWidget { @override Example08State createState() => new Example08State(); } class Example08State extends State { static const int _kItemCount = 10; final List _sizes = _createSizes(_kItemCount).toList(); ScrollController _scrollController = new ScrollController(); @override Widget build(BuildContext context) { return new Scaffold( appBar: new AppBar( title: new Text('random dynamic tile sizes'), ), body: new StaggeredGridView.countBuilder( controller: _scrollController, itemCount: 10, primary: false, crossAxisCount: 4, mainAxisSpacing: 4.0, crossAxisSpacing: 4.0, itemBuilder: (context, index) => new _Tile(index, _sizes[index]), staggeredTileBuilder: (index) => new StaggeredTile.fit(2), ), ); } @override void initState() { super.initState(); print('初始化进入'); _scrollController.addListener(() { print('我监听到了'); }); } } class IntSize { const IntSize(this.width, this.height); final int width; final int height; } class _Tile extends StatelessWidget { const _Tile(this.index, this.size); final IntSize size; final int index; @override Widget build(BuildContext context) { return new Card( child: new Column( children: [ new Stack( children: [ //new Center(child: new CircularProgressIndicator()), new Center( child: new FadeInImage.memoryNetwork( placeholder: kTransparentImage, image: 'https://picsum.photos/${size.width}/${size.height}/', ), ), ], ), new Padding( padding: const EdgeInsets.all(4.0), child: new Column( children: [ new Text( 'Image number $index', style: const TextStyle(fontWeight: FontWeight.bold), ), new Text( 'Width: ${size.width}', style: const TextStyle(color: Colors.grey), ), new Text( 'Height: ${size.height}', style: const TextStyle(color: Colors.grey), ), ], ), ) ], ), ); } }
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