[Solved] How to add MouseLeftButtonDownEvent to TreeListView's Cell

[Minwei]

We have occurred a problem in register TreeListView's cell.
Code:

    this.RowLoaded += new EventHandler<RowLoadedEventArgs>(CustomTabTreeListView_RowLoaded);

    this.RowUnloaded += new EventHandler<RowUnloadedEventArgs>(CustomTabTreeListView_RowUnloaded);

void CustomTabTreeListView_RowUnloaded(object sender, RowUnloadedEventArgs e)

{

    TreeListViewRow row = e.Row as TreeListViewRow;

    if (row != null)

    {

        row.Cells.ToList().ForEach(t => t.RemoveHandler(GridViewCellBase.MouseLeftButtonDownEvent, new EventHandler<MouseButtonEventArgs>(CustomTabTreeListView_Cell_MouseLeftButtonDown)));

    }

}

 

void CustomTabTreeListView_RowLoaded(object sender, RowLoadedEventArgs e)

{

    TreeListViewRow row = e.Row as TreeListViewRow;

    if (row != null)

    {

        row.Cells.ToList().ForEach(t => t.AddHandler(GridViewCellBase.MouseLeftButtonDownEvent, new EventHandler<MouseButtonEventArgs>(CustomTabTreeListView_Cell_MouseLeftButtonDown), true));

    }

}

 

private void CustomTabTreeListView_Cell_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)

{

 

}


Exception occurred in row.Cells.ToList().ForEach(t => t.AddHandler(GridViewCellBase.MouseLeftButtonDownEvent, new EventHandler<MouseButtonEventArgs>(CustomTabTreeListView_Cell_MouseLeftButtonDown), true));
 
Could you help me?
 
Thanks

[Minwei]

And if we changed to
            TreeListViewRow row = e.Row as TreeListViewRow;
            if (row != null)
            {
                row.Cells.ToList().ForEach(t => t.MouseLeftButtonDown += CustomTabTreeListView_Cell_MouseLeftButtonDown);
            }

The MouseLeftButtonDown event can't be triggered.

[Vanya Pavlova]

Hi Minwei,

 
Have you defined CellTemplate in RadTreeListView's columns? If that is the case you may take a look at the following forum thread "Gridview cell click event" and you will understand how to fire this event in an appropriate manner.

Kind regards,
Vanya Pavlova
the Telerik team

[Minwei]

We have read the thread.
Is there any other way to solve this issue?

Thx.

[Maya]

Hi Minwei,

Another approach would be to add a handler directly to the RadTreeListView and verify that you have a clicked on a cell:

public MainPage()
{

  InitializeComponent();       this.RadTreeListView1.AddHandler(GridViewCellBase.MouseLeftButtonDownEvent, new MouseButtonEventHandler(OnMouseLeftButtonDown), true);

}

 
private void OnMouseLeftButtonDown(object sender, MouseButtonEventArgs e)

{

            var clickedElement = e.OriginalSource as FrameworkElement;

            if (clickedElement != null)

            {

                var cell = clickedElement.ParentOfType<GridViewCell>();

                if(cell != null)

                {

                    MessageBox.Show("You clicked on a cell");

                }

            }      
}  

 

All the best,
Maya
the Telerik team

[Minwei]

Thanks for your help.
We'll have a try.