grouped_list 4.0.0-nullsafety.1

A Flutter ListView where the list items can be grouped into sections.

Grouped list package for Flutter.

Now with beta support for null safety!

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

Features

• Prerelease version with null safety support!
• Easy creation of chat dialog.
• List Items can be separated in groups.
• For the groups an individual header can be set.
• Almost all fields from ListView.builder available.

Getting Started

Add the package to your pubspec.yaml:

 grouped_list: ^4.0.0-nullsafety.1

In your dart file, import the library:

import 'package:grouped_list/grouped_list.dart';

Instead of using a ListView create a GroupedListView Widget:

 GroupedListView<dynamic, String>(
   elements: _elements,
   groupBy: (element) => element['group'],
   groupSeparatorBuilder: (String groupByValue) => Text(groupByValue),
   itemBuilder: (context, dynamic element) => Text(element['name']),
   itemComparator: (item1, item2) => item1['name'].compareTo(item2['name']), // optional
   useStickyGroupSeparators: true, // optional
   floatingHeader: true, // optional
   order: GroupedListOrder.ASC, // optional
 ),

Parameters:

Name	Description	Required	Default value
elements	A list of the data you want to display in the list	required	-
groupBy	Function which maps an element to its grouped value	required	-
itemBuilder / indexedItemBuilder	Function which returns an Widget which defines the item. indexedItemBuilder provides the current index as well. If both are defined indexedItemBuilder is preferred	yes, either of them	-
groupSeparatorBuilder / groupHeaderBuilder	Function which returns an Widget which defines the group headers. While groupSeparatorBuilder gets the groupBy-value as parameter groupHeaderBuilder gets the whole element. If both are defined groupHeaderBuilder is preferred	yes, either of them	-
useStickyGroupSeparators	When set to true the group header of the current visible group will stick on top	no	false
floatingHeader	Whether the sticky group header float over the list or occupy it's own space	no	false
stickyHeaderBackgroundColor	Defines the background color of the sticky header. Will only be used if useStickyGroupSeparators is used	no	Color(0xffF7F7F7)
separator	A Widget which defines a separator between items inside a group	no	no separator
groupComparator	Can be used to define a custom sorting for the groups. Otherwise the natural sorting order is used	no	-
itemComparator	Can be used to define a custom sorting for the elements inside each group. Otherwise the natural sorting order is used	no	-
order	Change to GroupedListOrder.DESC to reverse the group sorting	no	GroupedListOrder.ASC

Also the fields from ListView.builder can be used.

Highlight - Chat Dialog

Easy creation of chat dialogs. Just set the option reverse to true and order to GroupedListOrder.DESC. A full example can be found in the examples. The list will be scrolled to the end in the initial state and therefore scrolling will be against redeaing direction.

My other packages :

For easy creation of chat-like dialogs:

Check out my other package StickyGroupedList, which is based on the scrollable_positioned_list.