Binding KeyUp Event with Parameter

[Valentin]

Hello Telerik,

 

I have a RadGridView and I set to it an EventBinding like this :

<telerik:EventToCommandBehavior.EventBindings>
    <telerik:EventBinding Command="{Binding CommandDeleteFolderRSP}" EventName="KeyUp"
                   CommandParameter="Delete" />
</telerik:EventToCommandBehavior.EventBindings>

=> I want to bind a command if the user wants to delete the selected row.

 

The problem is that all of the keys are fired the command, not only the 'Delete' key.

What is my error ?

 

Thank you.

[Stefan]

Hi Valentin,

In order to achieve this, you can benefit from the built-in Commands that the control provides. This is demonstrated in the Commands WPF Demo and in its online equivalent.

Can you please give it a try and let me know how it goes?

Regards,
Stefan
Progress Telerik

[Valentin]

Hi Stefan,

 

Thanks for your answer, but if I understand documentations, I must go through in code behind to link the "Delete" keyboard and the Delete RadGridView Command ?

 

I know that I can do the following code :

Private Sub RadGridViewFoldersSettingsRSP_KeyUp(sender As Object, e As KeyEventArgs)
    If e.Key = Key.Delete Then
        Me._vm.CommandDeleteFolderRSP.Execute(Nothing)
    End If
End Sub

 

... But if I can do it in XAML file it's better.

 

Any idea ?

[Stefan]

Hi Valentin,

Thanks for the update.

It seems that I have overlooked that you need to perform the user confirmation on Delete button click. Please, excuse me for this.

In order to achieve such behavior you can utilize the Deleting event instead of the KeyDown one. It will be raised when the user presses the Delete key and you can cancel the deleting operation with it by setting the Cancel property of the event arguments to true. Can you please check this out?

I hope this helps. Let me know in case further assistance is needed.

Regards,
Stefan
Progress Telerik

[Valentin]

Hello Stefan,

I don't exactly understand what you mind.

I found the Deleting event but this one created a code in code behind and my question is, is it possible to do this only in xaml ?

If this is why I tried with the EventBinding but this one catch all keys, and not only the Delete key. May be my parameter is bad ?

 

I don't know if I express myself correctly.

 

Thank you !

[Stefan]

Hello Valentin,

To demonstrate what I have in mind, I have prepared a sample application which you can find attached to my post. As you should be able to see, the deleting operation is cancelled if the user tries to delete the item with name Chelsea. The event and the command, respectively, will be triggered when the user presses the Delete key.

Can you please check it out? Does this correspond to your requirements?

Regards,
Stefan
Progress Telerik

[Valentin]

Hi Stefan,

Thank you for this project.

It is the behavior that I was expected, but when I'm triying to set it on my project, nothing is done.

 

My Grid :

<telerik:RadGridView x:Name="RadGridViewFoldersSettingsRSP" AutoGenerateColumns="False" CanUserDeleteRows="False" CanUserFreezeColumns="False" CanUserInsertRows="False"
                                         CanUserReorderColumns="False" CanUserResizeColumns="True" CanUserResizeRows="False" CanUserSortColumns="False" Height="Auto" HorizontalAlignment="Stretch"
                                         IsReadOnly="True" ItemsSource="{Binding Folders}" Margin="5" MinWidth="400" MinHeight="340" SelectionMode="Single" SelectionUnit="FullRow" ShowGroupPanel="False"
                                         Width="Auto" Grid.Row="1" VerticalAlignment="Stretch" IsFilteringAllowed="False" SelectedItem="{Binding SelectedFolder}" RowIndicatorVisibility="Collapsed"
                                         GroupRenderMode="Flat" >
                        <!--KeyUp="RadGridViewFoldersSettingsRSP_KeyUp"-->
                        <telerik:EventToCommandBehavior.EventBindings>
                            <telerik:EventBinding Command="{Binding CommandDeleteFolderRSP}" EventName="Deleting" PassEventArgsToCommand="True" />
                        </telerik:EventToCommandBehavior.EventBindings>
<!--Columns-->
                    </telerik:RadGridView>

 

My VM :

Public ReadOnly Property CommandDeleteFolderRSP As ICommand
    Get
        Static _command As New CommandImpl(AddressOf DeleteFolderRSP)
        Return _command
    End Get
End Property

Private Sub DeleteFolderRSP(p_parameter As Object)
    If Me.SelectedFolder IsNot Nothing Then
        If (Me.ConfirmBox("text","header") = True) Then
            RSP_DAO.DeleteFolderRSP(Me.SelectedFolder.Folder)
            Me.LoadFoldersAutoprocessor()
        End If
    Else
        Me.ErrorBox("text","error")
    End If
End Sub

 

I put a breakpoint in the DeleteFolderRSP sub but I never enter inside. I tried with CanUserDeleteRows="True" but I have the same result...

What is the problem ?

 

Thank.

[Stefan]

Hello Valentin,

Its strange that the solution is not working on your end. I converted the provided sample application to a VB project and it is working as expected. You can find it attached to my reply.

May I kindly ask you to take a look at it? Does the approach demonstrated in it work as expected on your end?

Regards,
Stefan
Progress Telerik

[Valentin]

Hi Stefan,

Thanks for the project in VB, and it's the behavior that I expected.

 

I found why my breakpoint was never attained : although I set CanUserDeleteRows="True", the IsReadOnly="True" property blocks the Deleting event. Therefore, I set IsReadOnly="True" and the breakpoint was found by the debugger.

 

Thank you very much !

 

Valentin.

[Stefan]

Hi Valentin,

I am happy to hear that you have found the solution for your requirement.

Feel free to contact us again should you need other assistance with our components.

All the best,
Stefan
Progress Telerik