ContextMenu.Popup Event

Reference

Definition

Namespace:: System.Windows.Forms

Assembly:: System.Windows.Forms.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Occurs before the shortcut menu is displayed.

public:
 event EventHandler ^ Popup;

public event EventHandler Popup;

member this.Popup : EventHandler

Public Custom Event Popup As EventHandler

Event Type

EventHandler

Examples

The following code example creates an event handler for the Popup event of the ContextMenu. The code in the event handler determines which of two controls a PictureBox named pictureBox1 and a TextBox named textBox1 is the control displaying the shortcut menu. Depending on which control caused the ContextMenu to display its shortcut menu, the control adds the appropriate MenuItem objects to the ContextMenu. This example requires that you have an instance of the ContextMenu class, named contextMenu1, defined within the form. This example also requires that you have a TextBox and PictureBox added to a form and that the ContextMenu property of these controls is set to contextMenu1.

private:
   void MyPopupEventHandler( System::Object^ /*sender*/, System::EventArgs^ /*e*/ )
   {
      // Define the MenuItem objects to display for the TextBox.
      MenuItem^ menuItem1 = gcnew MenuItem( "&Copy" );
      MenuItem^ menuItem2 = gcnew MenuItem( "&Find and Replace" );
      // Define the MenuItem object to display for the PictureBox.
      MenuItem^ menuItem3 = gcnew MenuItem( "C&hange Picture" );
      
      // Clear all previously added MenuItems.
      contextMenu1->MenuItems->Clear();

      if ( contextMenu1->SourceControl == textBox1 )
      {
         
         // Add MenuItems to display for the TextBox.
         contextMenu1->MenuItems->Add( menuItem1 );
         contextMenu1->MenuItems->Add( menuItem2 );
      }
      else if ( contextMenu1->SourceControl == pictureBox1 )
      {
         // Add the MenuItem to display for the PictureBox.
         contextMenu1->MenuItems->Add( menuItem3 );
      }
   }

private void MyPopupEventHandler(System.Object sender, System.EventArgs e)
 {
    // Define the MenuItem objects to display for the TextBox.
    MenuItem menuItem1 = new MenuItem("&Copy");
    MenuItem menuItem2 = new MenuItem("&Find and Replace");
    // Define the MenuItem object to display for the PictureBox.
    MenuItem menuItem3 = new MenuItem("C&hange Picture");

    // Clear all previously added MenuItems.
    contextMenu1.MenuItems.Clear();
 
    if(contextMenu1.SourceControl == textBox1)
    {
       // Add MenuItems to display for the TextBox.
       contextMenu1.MenuItems.Add(menuItem1);
       contextMenu1.MenuItems.Add(menuItem2);
    }
    else if(contextMenu1.SourceControl == pictureBox1)
    {
       // Add the MenuItem to display for the PictureBox.
       contextMenu1.MenuItems.Add(menuItem3);
    }
 }

Private Sub MyPopupEventHandler(sender As System.Object, e As System.EventArgs)
    ' Define the MenuItem objects to display for the TextBox.
    Dim menuItem1 As New MenuItem("&Copy")
    Dim menuItem2 As New MenuItem("&Find and Replace")
    ' Define the MenuItem object to display for the PictureBox.
    Dim menuItem3 As New MenuItem("C&hange Picture")
    
    ' Clear all previously added MenuItems.
    contextMenu1.MenuItems.Clear()
    
    If contextMenu1.SourceControl Is textBox1 Then
        ' Add MenuItems to display for the TextBox.
        contextMenu1.MenuItems.Add(menuItem1)
        contextMenu1.MenuItems.Add(menuItem2)
    ElseIf contextMenu1.SourceControl Is pictureBox1 Then
        ' Add the MenuItem to display for the PictureBox.
        contextMenu1.MenuItems.Add(menuItem3)
    End If
End Sub

Remarks

You can use this event to initialize the MenuItem objects before they are displayed. For example, if you use a ContextMenu for three TextBox controls and you want to disable certain menu items in the ContextMenu depending on which TextBox is displaying the shortcut menu, you can create an event handler for this event. You could use the SourceControl property to determine which TextBox is about to display the ContextMenu and disable the appropriate MenuItem objects.

For more information about handling events, see Handling and Raising Events.

Applies to

Produkt	Verzie
.NET Framework	1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
Windows Desktop	3.0, 10

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