How to expand or collapse the UWP TreeGrid?

In UWP TreeGrid, the default behavior for expanding or collapsing tree nodes is to click the expander icon. However, you can customize this functionality to allow users to expand or collapse nodes by clicking any cell in the row. This can enhance user experience by making the interaction more intuitive.

To achieve this customization, you need to override the ProcessOnTapped method in the TreeGridRowSelectionController class. Below is a sample implementation:

C#

treeGrid.SelectionController = new TreeGridSelectionControllerExt(treeGrid);

public class TreeGridSelectionControllerExt : TreeGridRowSelectionController

{

   public TreeGridSelectionControllerExt(SfTreeGrid treeGrid) : base(treeGrid)

   {

   }



   protected override void ProcessOnTapped(TappedRoutedEventArgs e, RowColumnIndex currentRowColumnIndex)

   {

       if (currentRowColumnIndex.RowIndex <= this.TreeGrid.GetHeaderIndex())

           return;



       var node = TreeGrid.GetNodeAtRowIndex(currentRowColumnIndex.RowIndex);

       if (node != null)

       {

           if (node.IsExpanded)

               TreeGrid.CollapseNode(node);

           else if (!node.IsExpanded)

               TreeGrid.ExpandNode(node);

       }

       base.ProcessOnTapped(e, currentRowColumnIndex);

   }      

} 

Output

Sample:
View the sample in GitHub

Conclusion

​I hope you enjoyed learning on how to expand or collapse the UWP TreeGrid.

You can refer to our UWP TreeGrid feature tour page to know about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications.

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