Flutter最酷炫瀑布流实现

本文主要是介绍Flutter最酷炫瀑布流实现，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

• 背景

公司APP首页列表有此需求

• 使用哪些组件

StaggeredGridView.countBuilder

• 如何实现，难点在哪里

瀑布流的宽度与高度。
宽度=(屏幕宽—组件间隙) / 2
高度=图片高度进行设置
这样才能实现并展示瀑布流的效果
在pubspec.yaml 文件 添加 flutter_staggered_grid_view: ^0.4.1
flutter_screenutil: ^5.0.0这个是屏幕适配使用
使用过程中有什么问题可以自己私信我

• 最终效果图
  给你们配置了网红孙一宁

FeedListView.dart文件

class FeedListView extends StatefulWidget {final FeedMode? mode;FeedListView({Key? key, this.mode}) : super(key: key);@overrideFeedListViewState createState() => FeedListViewState();
}class FeedListViewState extends State<FeedListView> {List<String> imgList = ['https://bkimg.cdn.bcebos.com/pic/500fd9f9d72a6059252d1977427a239b033b5bb50c05?x-bce-process=image/watermark,image_d2F0ZXIvYmFpa2UxNTA=,g_7,xp_5,yp_5/format,f_auto','https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fnimg.ws.126.net%2F%3Furl%3Dhttp%3A%2F%2Fdingyue.ws.126.net%2F2021%2F0624%2Fca3f3547j00qv6yuq002ic000mn0148c.jpg%26thumbnail%3D650x2147483647%26quality%3D80%26type%3Djpg&refer=http%3A%2F%2Fnimg.ws.126.net&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1636620826&t=1f7e60c5d4a5baadafbae5d25dfdae39','https://bkimg.cdn.bcebos.com/pic/0d338744ebf81a4c510f10a4bd647759252dd42a0805?x-bce-process=image/watermark,image_d2F0ZXIvYmFpa2UyMjA=,g_7,xp_5,yp_5/format,f_auto','https://upload-images.jianshu.io/upload_images/6865547-100e574111cf0696.png?imageMogr2/auto-orient/strip|imageView2/2/w/507/format/webp','https://bkimg.cdn.bcebos.com/pic/500fd9f9d72a6059252d1977427a239b033b5bb50c05?x-bce-process=image/watermark,image_d2F0ZXIvYmFpa2UxNTA=,g_7,xp_5,yp_5/format,f_auto','https://p9-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/76a788337365419c971a94a5fbdbc4f8~tplv-k3u1fbpfcp-zoom-crop-mark:1304:1304:1304:734.awebp?','https://upload-images.jianshu.io/upload_images/6865547-100e574111cf0696.png?imageMogr2/auto-orient/strip|imageView2/2/w/507/format/webp','https://bkimg.cdn.bcebos.com/pic/0ff41bd5ad6eddc451dad5965395a1fd5266d0169502?x-bce-process=image/watermark,image_d2F0ZXIvYmFpa2UxMTY=,g_7,xp_5,yp_5/format,f_auto','https://p9-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/76a788337365419c971a94a5fbdbc4f8~tplv-k3u1fbpfcp-zoom-crop-mark:1304:1304:1304:734.awebp?','https://upload-images.jianshu.io/upload_images/6865547-100e574111cf0696.png?imageMogr2/auto-orient/strip|imageView2/2/w/507/format/webp','https://p9-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/76a788337365419c971a94a5fbdbc4f8~tplv-k3u1fbpfcp-zoom-crop-mark:1304:1304:1304:734.awebp?','https://upload-images.jianshu.io/upload_images/6865547-100e574111cf0696.png?imageMogr2/auto-orient/strip|imageView2/2/w/507/format/webp',];List<WaterfallsFlowModel> modelList = <WaterfallsFlowModel>[];@overridevoid initState() {super.initState();var ii = new Random().nextInt(5);var i = 0;imgList.forEach((element) {var _random = new Random();int next(int min, int max) => min + _random.nextInt(max - min);var c = next(200, 800);i++;var model = WaterfallsFlowModel(imageUrl: element,content: i > ii ? '影片名称影片名称影片名称影片名称影片名称' : '影片名称',like: '2313',imageHeight: c);modelList.add(model);});}@overrideWidget build(BuildContext context) {homeProvider = context.watch<HomeProvider>();return Container(child: StaggeredGridView.countBuilder(padding: EdgeInsets.symmetric(horizontal: 5.w),// shrinkWrap: true,crossAxisCount: 4,itemCount: provider.modelList.length,itemBuilder: (context, i) {if (i == 0 && mode == FeedMode.user) {return UserInfoTop();}return GestureDetector(onTap: _onTap,child: FeedWidget(mode: mode,model: provider.modelList[i],),);},staggeredTileBuilder: (index) {return StaggeredTile.fit(2);}),);}

WaterfallsFlowModel.dart

class WaterfallsFlowModel {String? imageUrl;String? content;String? name;String? avatarUrl;String? like;bool? isLise;int? imageWidth;int? imageHeight;WaterfallsFlowModel({this.imageUrl,this.content,this.name,this.avatarUrl,this.like,this.isLise,this.imageWidth,this.imageHeight});
}

FeedWidget.dart 瀑布流Widget

///瀑布流组件
class FeedWidget extends StatefulWidget {final String? imageUrl;final WaterfallsFlowModel? model;final FeedMode? mode;FeedWidget({Key? key, this.imageUrl, this.model, this.mode}): super(key: key);@override_FeedWidgetState createState() => _FeedWidgetState();
}class _FeedWidgetState extends State<FeedWidget> {var imageWidth = ScreenUtil().screenWidth - 30.w;var isMaxTwo = false;late WaterfallsFlowModel model;var isLike = false;@overrideWidget build(BuildContext context) {model = widget.model!;_didExceedOneMoreLines(model.content!, ScreenUtil().screenWidth / 2 - 120.w,TextStyle(fontSize: 30.sp));return Container(margin: EdgeInsets.fromLTRB(5.w, 5.w, 5.w, 5.w),height: isMaxTwo? model.imageHeight!.w + 190.w: model.imageHeight!.w + 150.w,decoration: BoxDecoration(borderRadius: BorderRadius.all(Radius.circular(8.w),),color: Colors.white,boxShadow: [BoxShadow(// 设置第一个阴影效果color: Color(0xfff2f2f4), // 阴影颜色为绿色blurRadius: 8.w, // 模糊半径为10), // 延伸半径为10]),child: Column(crossAxisAlignment: CrossAxisAlignment.start,children: [_imageWidget(),_movieWidget(),_likeWidget(),],),);}///1.顶部图片_imageWidget() {return Image.network(model.imageUrl!,width: imageWidth,height: model.imageHeight!.w,);}///2.影片名称_movieWidget() {return Padding(padding: EdgeInsets.fromLTRB(20.w, 20.w, 20.w, 0),child: Text(model.content!,overflow: TextOverflow.ellipsis,style: TextStyle(color: KColor.black,fontWeight: FontWeight.w700,fontSize: 30.sp,),maxLines: 2,),);}///3.用户名称与点赞数量_likeWidget() {return Padding(padding: EdgeInsets.all(20.w),child: Row(children: [widget.mode == FeedMode.user ? _viewsWidget() : _userInfoWidget(),SizedBox(width: 4.w),Text('111',overflow: TextOverflow.ellipsis,maxLines: 1,style: TextStyle(color: Color(0xFF66667E), fontSize: 24.sp))],),);}///3.1 用户信息_userInfoWidget() {return Expanded(child: Row(crossAxisAlignment: CrossAxisAlignment.start,children: [GestureDetector(onTap: () {},child: Image.network(model.imageUrl!,width: imageWidth,height: model.imageHeight!.w,),SizedBox(width: 12.w),Expanded(child: GestureDetector(onTap: () {},child: Text('用户名称用户名称用户名称',overflow: TextOverflow.ellipsis,style: TextStyle(color: Color(0xFF66667E),fontSize: 24.sp,),maxLines: 1,),),),SizedBox(width: 20.w),],),);}///3.2 浏览量_viewsWidget() {return Expanded(child: Row(children: [Text('111',overflow: TextOverflow.ellipsis,maxLines: 1,style: TextStyle(color: Color(0xFF66667E), fontSize: 24.sp))],),);}_didExceedOneMoreLines(String text, double width, TextStyle style) {final span = TextSpan(text: text, style: style);final tp =TextPainter(text: span, maxLines: 1, textDirection: TextDirection.ltr);tp.layout(maxWidth: width);if (tp.didExceedMaxLines) {isMaxTwo = true;} else {isMaxTwo = false;}}
}

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