Retrieve the Clicked Item When Opening a RadContextMenu

Environment

Product Version	2023.3.1114
Product	RadContextMenu for WPF

Description

Retrieve the clicked item when the RadContextMenu is opened.

Solution

You can derive from the RadContextMenu class and add an additional dependency property.

Deriving from the RadContextMenu class and adding an additional dependency property

public class ExtendedContextMenu : RadContextMenu 
{ 
    public static readonly DependencyProperty ClickedItemProperty = 
        DependencyProperty.Register("ClickedItem", typeof(FrameworkElement), typeof(ExtendedContextMenu), new PropertyMetadata(null)); 
 
    public FrameworkElement ClickedItem 
    { 
        get { return (FrameworkElement)GetValue(ClickedItemProperty); } 
        set { SetValue(ClickedItemProperty, value); } 
    } 
} 

Public Class ExtendedContextMenu 
    Inherits RadContextMenu 
 
    Public Shared ReadOnly ClickedItemProperty As DependencyProperty = DependencyProperty.Register("ClickedItem", GetType(FrameworkElement), GetType(ExtendedContextMenu), New PropertyMetadata(Nothing)) 
 
    Public Property ClickedItem As FrameworkElement 
        Get 
            Return CType(GetValue(ClickedItemProperty), FrameworkElement) 
        End Get 
        Set(ByVal value As FrameworkElement) 
            SetValue(ClickedItemProperty, value) 
        End Set 
    End Property 
End Class 

To assign a value to the dependency property, override the OnOpened method and call the GetClickedElement method. This method will allow you to retrieve the first element of the given type at the click point coordinates.

In the following example, the custom RadContextMenu is used in the RadTreeListView control and a reference to the clicked TreeListViewRow instance is retrieved in the OnOpened method.

Retrieving the clicked TreeListViewRow instance inside the OnOpened method of the custom RadContextMenu

public class ExtendedContextMenu : RadContextMenu 
{ 
    public static readonly DependencyProperty ClickedItemProperty = 
        DependencyProperty.Register("ClickedItem", typeof(FrameworkElement), typeof(ExtendedContextMenu), new PropertyMetadata(null)); 
 
    public FrameworkElement ClickedItem 
    { 
        get { return (FrameworkElement)GetValue(ClickedItemProperty); } 
        set { SetValue(ClickedItemProperty, value); } 
    } 
 
    protected override void OnOpened(RadRoutedEventArgs e) 
    { 
        base.OnOpened(e); 
 
        this.ClickedItem = null; 
        this.ClickedItem = this.GetClickedElement<TreeListViewRow>(); 
    } 
} 

Public Class ExtendedContextMenu 
    Inherits RadContextMenu 
 
    Public Shared ReadOnly ClickedItemProperty As DependencyProperty = DependencyProperty.Register("ClickedItem", GetType(FrameworkElement), GetType(ExtendedContextMenu), New PropertyMetadata(Nothing)) 
 
    Public Property ClickedItem As FrameworkElement 
        Get 
            Return CType(GetValue(ClickedItemProperty), FrameworkElement) 
        End Get 
        Set(ByVal value As FrameworkElement) 
            SetValue(ClickedItemProperty, value) 
        End Set 
    End Property 
 
    Protected Overrides Sub OnOpened(ByVal e As RadRoutedEventArgs) 
        MyBase.OnOpened(e) 
        Me.ClickedItem = Nothing 
        Me.ClickedItem = Me.GetClickedElement(Of TreeListViewRow)() 
    End Sub 
End Class