I want to implement a Staggered GridView, because my SliverGrid delegate requires an aspect ratio, and I want the grid items to be dynamically sized which is only possible with staggered gridview as far as I know.

My question is how can I implement a staggered gridview and use it in my CustomScrollView as a sliver?

Edit:

My pubspec.yaml file:

dependencies:
  flutter:
    sdk: flutter
  flutter_localizations:
    sdk: flutter
  flutter_staggered_grid_view: ^0.5.1
  ...other packages

CodePudding user response：

For Update version wrap GridView with SliverToBoxAdapter and set gridView physics to NeverScrollableScrollPhysics because CustomScrollView will handle scroll event.

SliverToBoxAdapter(
  child: GridView.custom(
    shrinkWrap: true,
    physics: const NeverScrollableScrollPhysics(),

Test Widget

Scaffold(
          body: CustomScrollView(
        slivers: [
          const SliverAppBar(
            title: Text("title"),
          ),
          SliverToBoxAdapter(
            child: GridView.custom(
              shrinkWrap: true,
              physics: const NeverScrollableScrollPhysics(),
              gridDelegate: SliverQuiltedGridDelegate(
                crossAxisCount: 4,
                mainAxisSpacing: 4,
                crossAxisSpacing: 4,
                repeatPattern: QuiltedGridRepeatPattern.inverted,
                pattern: const [
                  QuiltedGridTile(2, 2),
                  QuiltedGridTile(1, 1),
                  QuiltedGridTile(1, 1),
                  QuiltedGridTile(1, 2),
                ],
              ),
              childrenDelegate: SliverChildBuilderDelegate(
                (context, index) => Container(
                  color: Colors.cyanAccent,
                  child: Text("$index"),
                ),
                childCount: 44,
              ),
            ),
          )
        ],
      )),

flutter_staggered_grid_view: ^0.4.1 provides SliverStaggeredGrid to use as sliver's child.

 CustomScrollView(
   slivers: [
     SliverStaggeredGrid.countBuilder(...

CodePudding user response：

import 'package:flutter/material.dart';
import 'package:flutter_staggered_grid_view/flutter_staggered_grid_view.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(home: Dene());
  }
}

class Dene extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return SafeArea(
      child: Scaffold(
        body: Column(
          children: [
            Expanded(
              child: StaggeredGridView.countBuilder(
                mainAxisSpacing: 16,
                crossAxisSpacing: 16,
                crossAxisCount: 2,
                itemCount: 22,
                itemBuilder: (context, index) {
                  return Container(
                    width: 200,
                    height: 100,
                    color: Colors.red,
                  );
                },
                staggeredTileBuilder: (index) {
                  return StaggeredTile.fit(1);
                },
              ),
            ),
          ],
        ),
      ),
    );
  }
}

CodePudding user response：

import 'package:flutter/material.dart';
import 'package:flutter_staggered_grid_view/flutter_staggered_grid_view.dart';

void main() => runApp(Dene());

class Dene extends StatelessWidget {
  const Dene({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: MyApp(),
    );
  }
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return SafeArea(
      child: Scaffold(
        body: Column(
          children: [
            Expanded(
              child: StaggeredGridView.countBuilder(
                crossAxisCount: 4,
                itemCount: 22,
                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,
              ),
            ),
          ],
        ),
      ),
    );
  }
}