Close event for a RadPane

[Jorge Alberto]

Hello, I like to prevent the closing of a RadPane, when changes on its content has not been saved, like displaying the message: "Save changes before closing". I can't find the event to attach a handler to it.

Best regards.

[Konstantina]

Hello Jorge,

I am sending you a sample project, which illustrates how with the PreviewClose event handler you can display a window, which asks for confirmation.
I hope this will work for you.
If you have any further questions please feel free to ask again. 

Greetings,
Konstantina
the Telerik team

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[Ogi Ivanov]

Hi Konstantina,
I have a WPF solution using the MVVM pattern where I bind the RadPaneGroup of the DocumentHost to an ObservableCollection of RadDocumentPane on the ViewModel. I'm having a difficulty closing these documents from the X button on the right. If I trap the event as descibed in this post, remove the selected item from the collection and set the e.Hadled = true it works fine but only once. After that the button doesn't fire the event any more. How do I close a document pane when the RadPaneGroup is bound to an ObservableCollection on the ViewModel.

Your help is very much appreciated,
Ogi Ivanov

[Konstantina]

Hi Ogi,

Thank you for your question.

Binding the RadPaneGroup is not supported. You can manage the items of the RadPaneGroup via the Items collection.

If you have any other questions please feel free to contact us again.

All the best,
Konstantina
the Telerik team

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[Ogi Ivanov]

I rosolved this issue to work with the MVVM pattern so I'm sharing it. My requirement was to have a dynamicaly populated tab document collection in the DocumentHost. Using the MVVM pattern I have a ViewModel bound to a Window which contains the RadDocking control. Binding a RadPaneGroup to an observable collection work fine populating the tabs but they cannot be closed using the built-in controls. So I placed a button on the tab header to remove the item from the ObservableCollection. I added a cutom header template to the window resources.

 <Window.Resources>
    <DataTemplate x:Key="HeaderTemplate">
        <StackPanel Orientation="Horizontal">
            <Button Style="{StaticResource ImageButtonStyle}" Command="{Binding RelativeSource={RelativeSource FindAncestor,AncestorType={x:Type Window}}, Path=DataContext.CloseTabCommand}">
                <Image Height="14" Width="14" Source="Images/delete.png"/>
            </Button>
            <TextBlock Margin="5,0" Text="{Binding}"/>
        </StackPanel>
    </DataTemplate>
</Window.Resources>

It uses a custom style ImageButtonStyle to give it a compact look and it calls the command CloseTabCommand on the ViewModel which after running some checks removes the SelectedRadPane from the RadPaneList collection.

<telerikDocking:RadDocking.DocumentHost>
    <telerikDocking:RadSplitContainer InitialPosition="DockedLeft">
        <telerikDocking:RadPaneGroup ItemsSource="{Binding Path=RadPaneList}" SelectedItem="{Binding SelectedRadPane,Mode=TwoWay}" />
    </telerikDocking:RadSplitContainer>
</telerikDocking:RadDocking.DocumentHost>

So the ViewModel has the following properties bound to the xaml

public ObservableCollection<RadDocumentPane> RadPaneList { get; private set; }
public RadDocumentPane SelectedRadPane { get; set;}

And in order to add a RadDocumentPane to the collection I do the following which presumes there is a property Title on the ViewModel to bind the header to. It creates a new instance of the control to be displayed in the new tab and binds it to an instance of the respective ViewModel

System.Windows.Data.Binding binding = new System.Windows.Data.Binding("Title");
RadDocumentPane documentPane = new RadDocumentPane();
documentPane.SetBinding(RadDocumentPane.HeaderProperty, binding);
documentPane.SetBinding(RadDocumentPane.ToolTipProperty, binding);
documentPane.SetResourceReference(RadDocumentPane.HeaderTemplateProperty, "HeaderTemplate");
documentPane.CanUserClose = false;
documentPane.CanFloat = false;
documentPane.ContextMenuTemplate = null;

MyCustomContro myControl = new MyCustomControl();
documentPane.DataContext = new DocumentPaneViewModel();
documentPane.Content = myControl;

RadPaneList.Add(documentPane);

I hope this helps

[Konstantina]

Hello Ogi Ivanov,

Thank you for sharing your solution.

Just keep in mind that if you try to pin/unpin, float and dock the Pane you will get an error, because these actions manipulate the Items collection.

If you have any other questions about our controls please feel free to contact us again.

Best wishes,
Konstantina
the Telerik team

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[Rodrigo]

Hi, I want to join to the thread and expand it a little, i need to do the same thing that Jorge but the only difference is than Im not using the RadDocking control that you used on the example, Im using only the RadDocumentPane. Is there any property or event that I can use to do this ? Besides, is there any property or event that i can use to know if anything inside the RadDocumentPane was changed, in order to show a message of confirmation if the user wants to close the Pane only if he modified something inside the Pane (ie: changed radiobutton state or combobox value or entered some characters inside a textbox) ?

Thanks and Regards,

[George]

Hello Rodrigo,

You could handle the PreviewClose event for RadDocking and in the body of the handler you could check if RadDocumentPane is closing:

private void RadDocking_PreviewClose(object sender, Telerik.Windows.Controls.Docking.StateChangeEventArgs e)
        {
            if (e.Panes != null && e.Panes.Count() > 0 && e.Panes.ToList()[0].GetType() == typeof(RadDocumentPane))
            {
                // your code goes here
            }
        }

 
What kind of change do you need? We need more detailed information so that we can help you.

Please do not hesitate to contact us if you require any further information.

All the best,
George
the Telerik team

[Rodrigo]

Hi George, first of all thanks for the response, when i said "anything changed inside the RadDocumentPane" i meant to know if any control has changed, i mean, if the user made some modifications, but i really only need to know if any control has changed (besides of its an editable control or not). Regards.

[George]

Hello Rodrigo,

There is no property or event that indicates such change inside of a RadDocumentPane. You need to implement your custom logic to accomplish this. 

Please do not hesitate to contact us if you require any further information.

Kind regards,
George
the Telerik team