41 lines
1 KiB
Dart
41 lines
1 KiB
Dart
import 'package:flutter/material.dart';
|
|
|
|
class PlaceHolderWidget extends StatelessWidget {
|
|
const PlaceHolderWidget(
|
|
this.count,
|
|
this.columns, {
|
|
Key? key,
|
|
}) : super(key: key);
|
|
|
|
final int count, columns;
|
|
|
|
static final _gridViewCache = <String, GridView>{};
|
|
|
|
@override
|
|
Widget build(BuildContext context) {
|
|
final key = _getCacheKey(count, columns);
|
|
if (!_gridViewCache.containsKey(key)) {
|
|
_gridViewCache[key] = GridView.builder(
|
|
padding: const EdgeInsets.all(0),
|
|
shrinkWrap: true,
|
|
physics: const NeverScrollableScrollPhysics(),
|
|
itemBuilder: (context, index) {
|
|
return Container(
|
|
margin: const EdgeInsets.all(2.0),
|
|
color: Colors.grey[900],
|
|
);
|
|
},
|
|
itemCount: count,
|
|
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
|
|
crossAxisCount: columns,
|
|
),
|
|
);
|
|
}
|
|
return _gridViewCache[key]!;
|
|
}
|
|
|
|
String _getCacheKey(int totalCount, int columns) {
|
|
return totalCount.toString() + ":" + columns.toString();
|
|
}
|
|
}
|