我的顫振應用程式中有一個按鈕串列，如圖所示：
import 'package:flutter/material.dart';
class SelectableGridView extends StatefulWidget {
const SelectableGridView({Key? key}) : super(key: key);
@override
State<SelectableGridView> createState() => _SelectableGridViewState();
}
class _SelectableGridViewState extends State<SelectableGridView> {
int selectedIndex = 0;
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.blueGrey,
body: Padding(
padding: const EdgeInsets.all(16.0),
child: GridView.builder(
physics: const ClampingScrollPhysics(),
gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 3,
crossAxisSpacing: 16.0,
mainAxisSpacing: 16.0,
),
itemCount: 18,
itemBuilder: (context, index) {
return GestureDetector(
onTap: () => setState(() {
selectedIndex = index;
}),
child: Container(
color: selectedIndex == index ? Colors.pink : Colors.white,
),
);
},
),
),
);
}
}
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