modal_top_sheet 0.0.2 modal_top_sheet: ^0.0.2 copied to clipboard
A Flutter package for creating top-aligned modal sheets. The effect is like [AppBar] dropdown for example.
import 'package:flutter/material.dart';
import 'package:modal_top_sheet/modal_top_sheet.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
theme: ThemeData(
appBarTheme: const AppBarTheme(
backgroundColor: Colors.blue,
foregroundColor: Colors.black,
elevation: 0,
),
scaffoldBackgroundColor: Colors.white,
),
home: const HomePage(),
);
}
}
class HomePage extends StatefulWidget {
const HomePage({super.key});
@override
State<HomePage> createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
void openModal() async => showModalTopSheet(
context,
isDismissible: false,
child: const YourModalWidget(),
);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBarWithSubtitle(
titleSection: InkWell(
onTap: openModal,
child: const Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
'Top Modal Sheet Example',
maxLines: 1,
overflow: TextOverflow.ellipsis,
style: TextStyle(
fontSize: 14,
color: Colors.black,
),
),
Text(
'Tap to expand',
maxLines: 1,
overflow: TextOverflow.ellipsis,
style: TextStyle(
fontSize: 12,
color: Colors.black54,
),
),
],
)),
),
body: CustomScrollView(
slivers: [
SliverList.builder(
itemBuilder: (context, index) {
return ListTile(
title: Text('Item $index'),
);
},
itemCount: 20,
),
],
),
);
}
}
class AppBarWithSubtitle extends StatelessWidget
implements PreferredSizeWidget {
const AppBarWithSubtitle({
Key? key,
required this.titleSection,
}) : super(key: key);
final Widget titleSection;
@override
Widget build(BuildContext context) {
ThemeData theme = Theme.of(context);
return Align(
alignment: Alignment.topCenter,
child: SafeArea(
bottom: false,
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Flexible(
child: ConstrainedBox(
constraints: const BoxConstraints(maxHeight: kToolbarHeight),
child: CustomSingleChildLayout(
delegate: const _ToolbarContainerLayout(kToolbarHeight),
child: Container(
color: theme.appBarTheme.backgroundColor,
child: Padding(
padding: const EdgeInsets.symmetric(
vertical: 8.0, horizontal: 16.0),
child: Row(
children: [
Expanded(child: titleSection),
],
),
),
),
),
),
),
],
),
),
);
}
@override
Size get preferredSize => const Size.fromHeight(kToolbarHeight);
}
class _ToolbarContainerLayout extends SingleChildLayoutDelegate {
const _ToolbarContainerLayout(this.toolbarHeight);
final double toolbarHeight;
@override
BoxConstraints getConstraintsForChild(BoxConstraints constraints) {
return constraints.tighten(height: toolbarHeight);
}
@override
Size getSize(BoxConstraints constraints) {
return Size(constraints.maxWidth, toolbarHeight);
}
@override
Offset getPositionForChild(Size size, Size childSize) {
return Offset(0.0, size.height - childSize.height);
}
@override
bool shouldRelayout(_ToolbarContainerLayout oldDelegate) =>
toolbarHeight != oldDelegate.toolbarHeight;
}
class YourModalWidget extends StatelessWidget {
const YourModalWidget({super.key});
@override
Widget build(BuildContext context) {
ThemeData theme = Theme.of(context);
return ConstrainedBox(
constraints: BoxConstraints(
maxHeight: MediaQuery.of(context).size.height * 0.4,
),
child: Column(
children: [
Container(
constraints: BoxConstraints(
maxHeight: MediaQuery.of(context).size.height * 0.4 - 60,
),
color: Colors.blue,
child: ListView.builder(
shrinkWrap: true,
itemBuilder: (context, index) {
return ListTile(
title: Text('Modal Item $index'),
onTap: () {
Navigator.pop(context);
},
);
},
itemCount: 2,
),
),
ClipPath(
clipper: WaveClipper(),
child: Container(
color: theme.appBarTheme.backgroundColor,
height: 60,
child: Center(
child: CircleAvatar(
radius: 18,
backgroundColor: Colors.black54,
child: IconButton(
onPressed: () => Navigator.pop(context),
icon: const Icon(Icons.close),
color: Colors.blue,
iconSize: 20,
),
),
),
),
),
],
));
}
}
class WaveClipper extends CustomClipper<Path> {
@override
Path getClip(Size size) {
Path path = Path();
path.lineTo(0, size.height / 2);
path.conicTo(size.width / 8, size.height * 0.5, size.width / 3,
size.height * 0.75, 0.5);
path.quadraticBezierTo(
size.width / 2, size.height, size.width * 2 / 3, size.height * 0.75);
path.conicTo(size.width * 0.875, size.height * 0.5, size.width,
size.height * 0.5, 0.5);
path.lineTo(size.width, 0);
path.lineTo(0, 0);
path.close();
return path;
}
@override
bool shouldReclip(covariant CustomClipper<Path> oldClipper) {
return false;
}
}