grouped_list 2.2.0

A ListView where list items can be grouped into sections. With sticky headers.

Grouped list package for Flutter

A Flutter ListView in which list items can be grouped to sections.

Features

• All fields from ListView.builder constructor available.
• List Items can be separated in groups.
• For the groups an individual header can be set.
• Sticky Headers. Option to stick top header at the top.
• Option to sort the groups.

Getting Started

Add the package to your pubspec.yaml:

grouped_list: ^2.2.0

In your dart file, import the library:

import 'package:grouped_list/grouped_list.dart';

Instead of using a ListView create a GroupedListView Widget:

 GroupedListView(
   elements: _elements,
   groupBy: (element) => element['group'],
   groupSeparatorBuilder: _buildGroupSeparator,
   itemBuilder: (context, element) => Text(element['name']),
   order: GroupedListOrder.ASC,
 ),

You can also use most fields from the ListView.builder constructor.

Required Parameters:

• elements: A list of the data you want to display in the list.
• groupBy: Function which maps an element to its grouped value.
• itemBuilder: Function which returns an Widget which defines the item.
• groupSeparator: Function which returns an Widget which defines the section separator.

Widget _buildGroupSeparator(dynamic groupByValue) {
  return Text('$groupByValue');
}

The parameter groupByValue has the return type of the defined groupBy function.

Optional Parameters:

• useStickyGroupSeparators. If set to true the top groupSeparator will stick on top. Default is false.
• order: By default it's GroupedListOrder.ASC. Change to GroupedListOrder.DESC for reversing the group sorting.
• separator: A Widget which defines a separator between items inside a section.
• sort: A bool which defines if the passed data should be sorted by the widget. By default it's true.

Notice:

• The item builder functions only creates the actual list items. For seperator items use the separator parameter.
• Other than the itemBuilder function of the ListView.builder constructor the function provides the specific element instead of the index as parameter.
• The elements need to be sorted according to the groupBy return value. The Widgets sorts the elements by default. Disable the sorting only if your list is sorted beforehand.