Nilen Patel Inc.

Tutorial and code of the Popover in Flutter. Copy and paste the below code as per your requirements.

popover: ^0.2.6+3

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

void main() => runApp(const PopoverExample());

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        appBar: AppBar(title: const Center(child: Text('Popover'),)),
        body: SafeArea(
          child: Padding(
            padding: const EdgeInsets.all(16),
            child: Column(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              mainAxisSize: MainAxisSize.max,
              children: [
                Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  mainAxisSize: MainAxisSize.max,
                  children: const[
                     Button(),
                     Button(),
                     Button(),
                  ],
                ),
                Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  mainAxisSize: MainAxisSize.max,
                  children: const[
                     Button(),
                     Button(),
                     Button(),
                  ],
                ),
                Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  mainAxisSize: MainAxisSize.max,
                  children: const[
                     Button(),
                     Button(),
                     Button(),
                  ],
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    return Container(
      width: 80,
      height: 40,
      decoration: const BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.all(Radius.circular(5)),
        boxShadow: [BoxShadow(color: Colors.black26, blurRadius: 5)],
      ),
      child: GestureDetector(
        child: const Center(child: Text('Click Me')),
        onTap: () {
          showPopover(
            context: context,
            transitionDuration: const Duration(milliseconds: 150),
            bodyBuilder: (context) => const ListItems(),
            onPop: () => print('Popover was popped!'),
            direction: PopoverDirection.bottom,
            width: 200,
            height: 400,
            arrowHeight: 15,
            arrowWidth: 30,
          );
        },
      ),
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    return Scrollbar(
      child: Padding(
        padding: const EdgeInsets.symmetric(vertical: 8),
        child: ListView(
          padding: const EdgeInsets.all(8),
          children: [
            InkWell(
              onTap: () {
                Navigator.of(context)
                  ..pop()
                  ..push(
                    MaterialPageRoute<SecondRoute>(
                      builder: (context) => const SecondRoute(),
                    ),
                  );
              },
              child: Container(
                height: 50,
                color: Colors.amber[100],
                child: const Center(child: Text('Entry A')),
              ),
            ),
            const Divider(),
            Container(
              height: 50,
              color: Colors.amber[200],
              child: const Center(child: Text('Entry B')),
            ),
            const Divider(),
            Container(
              height: 50,
              color: Colors.amber[300],
              child: const Center(child: Text('Entry C')),
            ),
            const Divider(),
            Container(
              height: 50,
              color: Colors.amber[400],
              child: const Center(child: Text('Entry D')),
            ),
            const Divider(),
            Container(
              height: 50,
              color: Colors.amber[500],
              child: const Center(child: Text('Entry E')),
            ),
            const Divider(),
            Container(
              height: 50,
              color: Colors.amber[600],
              child: const Center(child: Text('Entry F')),
            ),
          ],
        ),
      ),
    );
  }
}

class SecondRoute extends StatelessWidget {
  const SecondRoute({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Second Route'),
        automaticallyImplyLeading: false,
      ),
      body: Center(
        child: ElevatedButton(
          onPressed: () => Navigator.pop(context),
          child: const Text('Go back!'),
        ),
      ),
    );
  }
}