implementing SelectionChanging

[Jean-Marc Schellings]

Hello,

We would like to implement something like a SelectionChanging event (before the selection is changed) on the RadGridView.
The aim is to be able to decide wether the user can change the selection or not and cancel the action that made the selection to be changed (like when the user click on a row).

We cannot find such event in the RadGridView API.

We tried to place some event args Handled properties to true but without success, but we are not used with routed event handling.

Could anyone tell us how this could be done with the RadGridView ? an extension method ? managing mouse events deeper ?

Thank you

[Milan]

Hello Jean-Marc Schellings,

There is one workaround that you can try - just subscribe to the SelectionChanged event and in the event handler decide if the new selection is valid and if not reverse the changes:

private bool isChanging = false;

void RadGridView1_SelectionChanged(object sender, SelectionChangeEventArgs e)
{
    if (isChanging)
        return;

    this.isChanging = true;

    foreach (var item in e.AddedRecords)
        this.RadGridView1.SelectedRecords.Remove(item);

    foreach (var item in e.RemovedRecords)
        this.RadGridView1.SelectedRecords.Add(item);

    this.isChanging = false;
}

For examples, this code does not allow any changes to the selection. Of course, you can implements your own selection validation logic inside the event handler.
Hope this helps.

We are also considering adding SelectionChanging event to RadGridView in the future.


Best wishes,
Milan
the Telerik team

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[Sandi Markon]

Yes, we badly need this event! Please implement SelectionChanging event to RadGridView in the near future!

Best Regards,

[Milan]

Hello Sandi Markon,

Thank you for your feedback. We would really appreciate it if you could spare some time to share how would you use the SelectionChanging event? I guess the primary use of this event would be to cancel selection changes but I am also interested if you expect to be able to modify the selection in that event? For example, if the event arguments expose RemovedItems and AddedItems properties should you be able to modify those collections or just use them as reference (read-only collections)?

Best wishes,
Milan
the Telerik team

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