ContextMenu for ListBox Item

[Grant Drury-Green]

I have a list box with some items in it. I have a ContextMenu assigned to the ListBox

I want to add logic to the "DropDownOpening" event so that the menu only displays when an ITEM is right clicked, and that is contextual for that item.

I don't seem to be able to work out how to retrieve the item over which the right click was made.

I've tried listBox.SelectedItem but that doesn't work as the right click isn't moving the selection

I've also tried listBox.GetChildAtPoint(contextMenu.DropDown.Location) - but that always returns null

Any help greatly appreciated.

Grant

[Victor]

Hello Grant Drury-Green,

Thank you for contacting us. Here is some sample code that demonstrates how you can get the clicked ListBoxItem object:

public partial class Form1 : Form
{
    RadListBox listBox = new RadListBox();
    public Form1()
    {
        InitializeComponent();
        this.Controls.Add(listBox);

        listBox.DataSource = new string[] { "1", "2", "3" };
        RadContextMenu menu = new RadContextMenu();
        RadContextMenuManager mgr = new RadContextMenuManager();
        mgr.SetRadContextMenu(listBox, menu);

        menu.DropDownOpening += new System.ComponentModel.CancelEventHandler(menu_DropDownOpening);
    }

    void menu_DropDownOpening(object sender, System.ComponentModel.CancelEventArgs e)
    {
        RadContextMenu menu = (RadContextMenu)sender;
        menu.Items.Clear();
        RadElement elementAtPoint = this.listBox.ElementTree.GetElementAtPoint(this.listBox.ListBoxElement.PointFromScreen(Control.MousePosition));
        if (elementAtPoint is RadListBoxItem)
        {
            // Add menu options based on the item.
            menu.Items.Add(new RadMenuItem((elementAtPoint as RadListBoxItem).Text));
        }
    }
}

Do not hesitate to write me back if you have further questions.

Kind regards,
Victor
the Telerik team

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[Grant Drury-Green]

Perfect - many thanks

[bruno]

Maybe because some updates, now this does not works.

Based on this post:
http://www.telerik.com/community/forums/winforms/menus/contextmenu-on-listcontrol.aspx

I changed it to someting like this:

private void menu_DropDownOpening(object sender, CancelEventArgs e)
{
  RadContextMenu menu = (RadContextMenu)sender;<br>
  menu.Items.Clear();
 
  RadListVisualItem elementAtPoint = this.listBox.ElementTree.GetElementAtPoint(this.listBox.ListElement.PointFromScreen(Control.MousePosition)) as RadListVisualItem;

  if (elementAtPoint != null)
  {
    RadListDataItem dataItem = elementAtPoint.Data;
    menu.Items.Add(new RadMenuItem(dataItem.Text));
  }
  else
    e.Cancel = true;
}

This works fine for me.

Hope it helps someone :)

Best Regards,

Bruno Almeida

[Peter]

Hello bruno,

Thanks for sharing your solution with us.

Your Telerik points have been updated for your community effort.

If you have additional feedback to share, feel free to contact me.

Sincerely yours,
Peter
the Telerik team

[Sangeetha]

Hi

The code below works only for RadListCOntrol, for RadListBox it returns null.
RadListVisualItem elementAtPoint = this.listBox.ElementTree.GetElementAtPoint(this.listBox.ListElement.PointFromScreen(Control.MousePosition)) as RadListVisualItem;

Can someone please suggest working code for the same scenario?

Regards,
Sangeetha. G

[Richard Slade]

Hi Sangeetha,

Are you trying to do the same on a RadDropDownList?
Let me know and I'll do my best to help
Richard

[Sangeetha]

Hi

Thanks for your reply.

The control is RadListBox.
code trying to execute:
 private void m_radListFunction_MouseDown(object sender, MouseEventArgs e)
{
         RadElement elementAtPoint = m_radListFunction.ElementTree.GetElementAtPoint(m_radListFunction.ListBoxElement.PointFromScreen(e.Location)) as RadElement;
         if (elementAtPoint != null)
            {
            }
}

This returns null.

Regards,
Sangeetha. G

[Richard Slade]

Hello Sangeetha,

You should use the code that was provided in the aforementioned forum post for this

private void radListControl1_MouseDown(object sender, MouseEventArgs e)
{
    if (e.Button == MouseButtons.Right)
    {
        RadListVisualItem clickedItem = radListControl1.ElementTree.GetElementAtPoint(e.Location) as RadListVisualItem;
        if (clickedItem != null)
        {
            RadListDataItem dataItem = clickedItem.Data;
            MessageBox.Show("Right Clicked " + dataItem.Text);
        }
    }
}

Hope that helps
Richard

[Sangeetha]

RadListVisualItem is not supported in the telerik version used by me.
So I tried with RadListBoxElement which returns the entire list box instead of the selected one.

[Peter]

Hello Grant Drury-Green,

Thank you for writing.

You should use the following code snippet. 

this.radListBox1.MouseDown += new MouseEventHandler(radListBox1_MouseDown);

      private void radListBox1_MouseDown(object sender, MouseEventArgs e)
      {
          if (e.Button == MouseButtons.Right)
          {
              RadElement clickedItem = radListControl2.ElementTree.GetElementAtPoint(e.Location) as RadElement;
              if (clickedItem != null)
              {
                  RadListBoxItem dataItem = clickedItem as RadListBoxItem;
                  MessageBox.Show("Right Clicked " + dataItem.Text);
              }
          }
      }

If you have any other questions, do not hesitate to contact us.

Richard, once again, thank you for your efforts.

All the best,
Peter
the Telerik team