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How to clear grouping when long pressing on a caption row in Xamarin.iOS DataGrid?

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SfDataGrid fires the SfDataGrid.GridLongPressed event when the grid is long pressed. You can perform any desired operation upon long pressing by handling the GridLongPressed event. The GridLongPressed event provides you with the arguments “RowIndex” and “RowData” (the underlying data associated with the row based on the row type) there by allowing you to customise the long press event based on the requirements.

The SfDataGrid fires this event for all type of rows such as header row, caption summary rows and data rows. When you long press the header row the associated GridColumn of the long pressed header cell is passed as RowData. When you long press the data rows, the underlying data object associated with the long pressed row is passed as RowData. When you long press the caption rows, the group information associated with the long pressed caption row is passed as RowData. Thus by checking whether the RowData is a “Group” you can clear the grouping in SfDataGrid by clearing the SfDataGrid.GroupColumnDescriptions collection.

 

Refer the following example which illustrates clearing the grouping in a SfDataGrid when long pressing a caption row by handling the GridLongPressed event.

public partial class ViewController : UIViewController
{
    SfDataGrid grid= new SfDataGrid();
    ViewModel viewModel=new ViewModel();
    public override void ViewDidLoad ()
    {
         base.ViewDidLoad ();
         View.BackgroundColor = UIColor.White;
         grid.ItemsSource = viewModel.ProductDetails;
         grid.BackgroundColor = UIColor.White;
         grid.GroupColumnDescriptions.Add(new GroupColumnDescription() { ColumnName = "UserRating" });
         grid.GridLongPressed += grid_GridLongPressed;
         View.AddSubview (grid);
    }
 
    public override void ViewDidLayoutSubviews ()
    {
         this.grid.Frame = new CGRect (0, 20, View.Frame.Width, View.Frame.Height);
         base.ViewDidLayoutSubviews ();
    }
    
    void sfGrid_GridLongPressed(object sender, GridLongPressedEventsArgs e)
    {
         //code to clear grouping
         if (e.RowData is Group) 
         {               
             UIAlertView alert = new UIAlertView () 
             {
                 Title = "Clear Grouping…",
                 Message = "Are you sure to remove grouping from the grid ?"
             };
             alert.AddButton ("OK");
             alert.AddButton ("Cancel");
             alert.Show ();
             alert.Clicked += Alert_Clicked;
         }
    }
    
    void Alert_Clicked (object sender, UIButtonEventArgs e)
    {
         if (e.ButtonIndex == 0)
  grid.GroupColumnDescriptions.Clear ();
         else
  return;
    }
}

 

Refer the following screenshot for the final outcome upon execution of the above code

Screenshot for the final outcome upon execution

The working sample for this KB can be downloaded from the following link
https://www.syncfusion.com/downloads/support/directtrac/general/ze/LongPress511868129


Conclusion

I hope you enjoyed learning about how to clear grouping when long pressing on a caption row.


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

For current customers, you can check out our components from the License and Downloads page. If you are new to Syncfusion, you can try our 30-day free trial to check out our other controls.

If you have any queries or require clarifications, please let us know in the comments section below. You can also contact us through our support forumsDirect-Trac, or feedback portal. We are always happy to assist you!


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