Rank 1
How can i expose RadTreeView.SelectedContainer property, which will return my own custom type instead of RadTreeViewItem?
code:
public RadTreeViewItem SelectedContainer
{
get { return (RadTreeViewItem)TreeView.GetValue(RadTreeView.SelectedContainerProperty); }
set { TreeView.SetValue(RadTreeView.SelectedContainerProperty, value); }
}
instead of the above code i want to write something like this:
public TngTreeViewItem SelectedContainer
{
get { return (TngTreeViewItem )TreeView.GetValue(RadTreeView.SelectedContainerProperty); }
set { TreeView.SetValue(RadTreeView.SelectedContainerProperty, value); }
}
--------------------------------------------------------------------------------------------------------------------------------------------------------------------TngTreeViewItem.cs
[
ContentProperty("Items")]
public class TngTreeViewItem : FrameworkContentElement
{
protected RadTreeViewItem _treeViewItem = new RadTreeViewItem();
#region
Constructors
static TngTreeViewItem()
{
DefaultStyleKeyProperty.OverrideMetadata(
typeof(TngTreeViewItem), new FrameworkPropertyMetadata(typeof(TngTreeViewItem)));
}
#endregion
#region
Internal Control
public RadTreeViewItem InternalControl
{
get
{
return _treeViewItem;
}
}
#endregion
#region
Property: Header
public virtual Object Header
{
get { return GetValue(HeaderProperty); }
set { SetValue(HeaderProperty, value); }
}
public static readonly DependencyProperty HeaderProperty =
DependencyProperty.Register(
"Header", typeof(Object), typeof(TngTreeViewItem),
new FrameworkPropertyMetadata
{
PropertyChangedCallback = (obj, e) =>
{
(obj
as TngTreeViewItem).UpdateHeader(e.NewValue);
}
});
private void UpdateHeader(Object sel)
{
_treeViewItem.Header = sel;
}
#endregion
}}
Thanks,
-Manjurekar
3 Answers, 1 is accepted
I've attached you a sample project demonstrating how to implement your own SelectedContainer property. I hope this will help you solve the issue. If not, can you elaborate a little bit more on what you are trying to achieve.
Kind regards,
Hristo Milyakov
the Telerik team
Rank 1
Thank you for the example.
one question here. can we avoid using the RadRoutedEventArgs in the client application. instead of that i want to use my custom dependency property which wraps even the events.
I dont want to use any Telerik's reference's in the client application.
thank you
Manjerekar
It is possible to do that. You need to add new definition of SelectedEvent in the MyTreeViewItem class with the type of MyRoutedEventArgs.
new public static readonly RoutedEvent SelectedEvent = EventManager.RegisterRoutedEvent("Selected", RoutingStrategy.Bubble, typeof(EventHandler<MyRoutedEventArgs>), typeof(MyTreeViewItem));Next step is to implement new Selected setter and getter with the type of EventHandler<MyRoutedEvnetArgs>.
public new event EventHandler<MyRoutedEventArgs> Selected { add { this.AddHandler(MyTreeViewItem.SelectedEvent, value); } remove { this.RemoveHandler(MyTreeViewItem.SelectedEvent, value); } }Now you will have your own SelectedEvent with the customized event args type. Next you need to fire the event in appropriate conditions. This could be achieved if you register a handler to the original SelectedEvent (with event args of type RadRoutedeventArgs) of the base RadTreeView class. From the handler you can fire your custom. Following code snippet demonstrates what I mean:
public MyTreeView() : base() { (this as RadTreeView).Selected += new EventHandler<Telerik.Windows.RadRoutedEventArgs>(MyTreeView_Selected); } void MyTreeView_Selected(object sender, Telerik.Windows.RadRoutedEventArgs e) { //If e.Handeled=true is not commented then event handlers registered to both type of events will be executed. e.Handled = true; MyRoutedEventArgs me = new MyRoutedEventArgs(); //Pass the usefull data from RadRoutedEventArgs to your custom event args object. //... //... //... me.RoutedEvent = MyTreeViewItem.SelectedEvent; this.RaiseEvent(me); }Finally you need to register an event handler for SelectedEvent of the MyTreeView object.
I'm attaching a sample project demonstrating the suggested solution. Please let us know if it works for you.
Kind regards,
Hristo Milyakov
the Telerik team