This package is helping you to show a list of custom object and let user pick one or multiple items form it.

There are 2 type of widget that you can use:

1-ListSelection
2-SingleSelection

In the first one user is able to select more than one item and in the second one user can just select one item.

Getting started

For using this package you just to need add it to your pubspec.yaml file.

selection :last version

After that import it where ever you want to use it.

import 'package:selection/selection.dart;

And finally like the blow codes use it to show user selection list to user.
ListSelection

 ListSelection<String>(
//custom style for hint
boxDecoration: SelectionBoxDecoration(
hintStyle: const TextStyle(color: Colors.red)),
//custom style for modal
modalDecoration:
SelectionModalDecoration(btnBackGroundColor: Colors.red),
//the title of your selection box
title: 'Select multiple number',
//hint text that shows in selection box
hint: 'choose',
// these are the items that will be shown in modal
itemBuilder: (item, isSelected) =>
Text(
item,
style: TextStyle(
color: isSelected ? Colors.red : Colors.black),
),
//selection callback
selectCallBack: (itemsSelected) {},
//your items
items: const ['1', '2', '3', '4']);

SingleSelection

 //show simple string
SingleSelection<String>(
//custom style for hint
boxDecoration: SelectionBoxDecoration(
hintStyle: const TextStyle(color: Colors.red)),
//the title of your selection box
title: 'Select one number',
//hint text that shows in selection box
hint: 'choose',
//when user choose this item will be shown in hint text. it must be string
showItemSelection: (item) => item,
// these are the items that will be shown in modal
itemBuilder: (item) => Text(item),
//selection callback
selectCallBack: (itemSelected) {},
//your items
items: const ['1', '2', '3', '4']);


SingleSelection<ModelTest>(
//custom style for hint
boxDecoration: SelectionBoxDecoration(
hintStyle: const TextStyle(color: Colors.red)),
//the title of your selection box
title: 'Select one number',
//hint text that shows in selection box
hint: 'choose',
//when user choose this item will be shown in hint text. it must be string
showItemSelection: (item) => item.title,
// these are the items that will be shown in modal
itemBuilder: (item) => Text(item.title),
//selection callback
selectCallBack: (itemSelected) {},
//your items
items:getTestModel);

NOTICE

After setting SelectionBoxDecoration and SelectionModalDecoration you need to restart your app and if you just use hot reload you face to err.

You can contribute on github https://github.com/mjdarvishi