Distinguishing the Source Control of RadContextMenu
Environment
| Product Version | 2018.1 220 |
| Product | RadContextMenu for WinForms |
Description
The RadContextMenuManager component allows a single RadContextMenu instance to be associated with various controls. This KB article demonstrates a way to distinguish the source control of the menu. It may be useful in a scenario requiring the menu items need to be dynamically changed or different actions be invoked upon clicking the menu items. The example assumes that two different RadListView controls are using the same RadContextMenu. Additional information about the RadContextMenuManager component is available here: https://docs.telerik.com/devtools/winforms/menus/contextmenu/assign-radcontextmenu-to-telerik-and-non-telerik-controls.
Solution
The source control will be extracted from the element`s visual tree and stored in a variable so that it can be validated upon clicking the menu items.
Figure 1: Single Context Menu
Context Menu Events
public partial class RadContextMenuSourceControlForm : Telerik.WinControls.UI.RadForm
{
public RadContextMenuSourceControlForm()
{
InitializeComponent();
this.radContextMenu1.DropDownOpening += RadContextMenu1_DropDownOpening;
this.radMenuItem1.Click += RadMenuItem1_Click;
}
private void RadMenuItem1_Click(object sender, EventArgs e)
{
if (this.currentControl == this.radListView1)
{
//...
}
else if (this.currentControl == this.radListView2)
{
//...
}
RadMessageBox.Show(this.currentControl.Name);
}
RadControl currentControl = null;
private void RadContextMenu1_DropDownOpening(object sender, CancelEventArgs e)
{
RadElement element = sender as RadElement;
if (element == null)
{
return;
}
this.currentControl = element.ElementTree.Control as RadControl;
if (this.currentControl != null)
{
Console.WriteLine(this.currentControl.Name);
}
}
}
Public Class RadContextMenuSourceControlForm
Public Sub New()
InitializeComponent()
AddHandler Me.radContextMenu1.DropDownOpening, AddressOf RadContextMenu1_DropDownOpening
AddHandler Me.radMenuItem1.Click, AddressOf RadMenuItem1_Click
End Sub
Private Sub RadMenuItem1_Click(ByVal sender As Object, ByVal e As EventArgs)
If Me.currentControl Is Me.radListView1 Then
'../
ElseIf Me.currentControl Is Me.radListView2 Then
'...
End If
RadMessageBox.Show(Me.currentControl.Name)
End Sub
Private currentControl As RadControl = Nothing
Private Sub RadContextMenu1_DropDownOpening(ByVal sender As Object, ByVal e As CancelEventArgs)
Dim element As RadElement = TryCast(sender, RadElement)
If element Is Nothing Then
Return
End If
Me.currentControl = TryCast(element.ElementTree.Control, RadControl)
If Me.currentControl IsNot Nothing Then
Console.WriteLine(Me.currentControl.Name)
End If
End Sub
End Class