How to Popup a Context Menu when NSButton is Clicked in C#

gistfile1.txt

Taken from https://praveenmatanam.wordpress.com/2008/09/05/how-to-popup-context-menu-when-clicked-on-button/ and converted to C#

where...
propertyButton is NSButton.
popUpContextMenu is a prepopulated NSMenu with NSMenuItems

      propertyButton.Activated += (object sender, EventArgs e) => {
				var senderAsButton = (NSButton)sender;
				var frame = senderAsButton.Frame;
				var menuOrigin = senderAsButton.Superview.ConvertPointToView (new CGPoint (frame.Location.X, frame.Location.Y + frame.Size.Height + 3), null);

				var popupMenuEvent = NSEvent.MouseEvent (NSEventType.LeftMouseDown, menuOrigin, (NSEventModifierMask)0x100, 0, senderAsButton.Window.WindowNumber, senderAsButton.Window.GraphicsContext, 0, 1, 1);

				NSMenu.PopUpContextMenu (popUpContextMenu, popupMenuEvent, senderAsButton);
			};
			
Thanks Chris Hamons for your help!


And if you want to use a subclass, try something like this...

public class ButtonWithContextMenu : NSButton
	{
		NSMenu popUpContextMenu;
		public NSMenu PopUpContextMenu { 
			get { return popUpContextMenu; }
			set { popUpContextMenu = value; }
		}

		public ButtonWithContextMenu ()
		{
			Bordered = false;
			Enabled = true;
			Image = NSImage.ImageNamed ("maybe-a-fancy-image-here");
			ImageScaling = NSImageScale.AxesIndependently;
			Title = string.Empty;
			TranslatesAutoresizingMaskIntoConstraints = false;

			popUpContextMenu = new NSMenu ();
		}

        public override void MouseDown(NSEvent theEvent)
        {
			if (theEvent.Type == NSEventType.LeftMouseDown) {
				var menuOrigin = this.Superview.ConvertPointToView (new CGPoint (Frame.Location.X - 1, Frame.Location.Y + Frame.Size.Height + 4), null);

				var popupMenuEvent = NSEvent.MouseEvent (theEvent.Type, menuOrigin, (NSEventModifierMask)0x100, 0, this.Window.WindowNumber, this.Window.GraphicsContext, 0, 1, 1);

				NSMenu.PopUpContextMenu (popUpContextMenu, popupMenuEvent, this);
			}
			base.MouseDown(theEvent);
        }
    }
    
Use the PopUpContextMenu property to populate your menu when the time is right for you.