Implement a draggable and scrollable bottom sheet In flutter.

main.dart

import 'dart:async';

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

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});
  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final Completer<GoogleMapController> _controller = Completer<GoogleMapController>();

  static const CameraPosition _kGooglePlex = CameraPosition(
    target: LatLng(37.42796133580664, -122.085749655962),
    zoom: 14.4746,
  );

  final DraggableScrollableController sheetController = DraggableScrollableController();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text(widget.title),
      ),
      body: Stack(
        children: [
          GoogleMap(
            mapType: MapType.hybrid,
            initialCameraPosition: _kGooglePlex,
            onMapCreated: (GoogleMapController controller) {
              _controller.complete(controller);
            },
          ),
          DraggableScrollableSheet(
            controller: sheetController,
            builder: (BuildContext context, scrollController) {
              return Container(
                clipBehavior: Clip.hardEdge,
                decoration: BoxDecoration(
                  color: Theme.of(context).canvasColor,
                  borderRadius: const BorderRadius.only(
                    topLeft: Radius.circular(25),
                    topRight: Radius.circular(25),
                  ),
                ),
                child: CustomScrollView(
                  controller: scrollController,
                  slivers: [
                    SliverToBoxAdapter(
                      child: Center(
                        child: Container(
                          decoration: BoxDecoration(
                            color: Theme.of(context).hintColor,
                            borderRadius: const BorderRadius.all(Radius.circular(10)),
                          ),
                          height: 4,
                          width: 40,
                          margin: const EdgeInsets.symmetric(vertical: 10),
                        ),
                      ),
                    ),
                    const SliverAppBar(
                      title: Text('My App'),
                      primary: false,
                      pinned: true,
                      centerTitle: false,
                    ),
                    SliverList.list(children: [
                      FilledButton.tonal(
                        onPressed: () {
                          sheetController.animateTo(
                            0.8,
                            duration: const Duration(milliseconds: 200),
                            curve: Curves.bounceIn,
                          );
                        },
                        child: const Text('Scrool to 0.8'),
                      ),
                      const ListTile(title: Text('Jane Doe')),
                      const ListTile(title: Text('Jack Reacher')),
                    ])
                  ],
                ),
              );
            },
          ),
        ],
      ),
    );
  }
}

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