ReorderableListView() is a built-in widget in the flutter that enables the user to change the order of the items placed in the ListView through a long tap and drag.
A reminder app or a task manager app would be the perfect example of this. These apps usually provide reorder or sort functionalities. As in these apps, the user needs to be able to arrange/sort items based on his/her preferences or order priority.
This is pretty easy to implement in the flutter. So, let’s check how to implement Reorderable ListView in Flutter.
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Step 1: Create a flutter project.
Step 2: First, we will create a list that has data. So, we will create a list of strings and names as tasks.
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List<String> tasks = ["A Task", "B Task", "C Task", "D Task", "E Task", "F Task","G Task","H Task"]; |
Step 3: Add the ReorderableListView() widget and add the key in the children of the ReorderableListView widget. The key is expected to distinguish the items after their position is changed.
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Container(padding: const EdgeInsets.all(8.0), child: ReorderableListView( children: [ for(final task in tasks) Card(color: Colors.lightBlueAccent.shade100, key: ValueKey(task), elevation: 5.0, child: ListTile(title: Text(task), leading: const Icon(Icons.work, color: Colors.black),),), ],)) |
Step 4: Add the reorder function. It is a callback function used by the list to report that a list item has been dragged to a new location in the list and the application should update the order of the items.
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onReorder:(oldIndex,newIndex ){ setState(() { if(newIndex > oldIndex){ newIndex = newIndex-1; } }); final task = tasks.removeAt(oldIndex); tasks.insert(newIndex, task); } |
Now run your code and check by long-tapping on an item and dragging it to a new position.
Output:
So, this is how we implement reorderable listview in Flutter.
Thanks for reading this article ❤
If I got something wrong, let me know in the comments. I would love to improve.
Reference Link: https://www.kindacode.com/article/working-with-reorderablelistview-in-flutter/