System.Windows.Forms.MenuTracker.OnMotion C# (CSharp) Method

		public void OnMotion (MouseEventArgs args)
		{
			// Windows helpfully sends us MOUSEMOVE messages when any key is pressed.
			// So if the mouse hasn't actually moved since the last MOUSEMOVE, ignore it.
			if (args.Location == last_motion)
				return;
				
			last_motion = args.Location;
			
			MenuItem item = GetItemAtXY (args.X, args.Y);

			UpdateCursor ();

			if (CurrentMenu.SelectedItem == item)
				return;

			//GrabControl.ActiveTracker = (active || item != null) ? this : null;

			if (item == null) {
				MenuItem old_item = CurrentMenu.SelectedItem;
				
				// Return when is a popup with visible subitems for MainMenu 
				if  ((active && old_item.VisibleItems && old_item.IsPopup && (CurrentMenu is MainMenu)))
					return;

				// Also returns when keyboard navigating
				if (keynav_state == KeyNavState.Navigating)
					return;
				
				// Select parent menu when move outside of menu item
				if (old_item.Parent is MenuItem) {
					MenuItem new_item = (old_item.Parent as MenuItem);
					if (new_item.IsPopup) {
						SelectItem (new_item.Parent, new_item, false);
						return;
					}
				}
				if (CurrentMenu != TopMenu)
					CurrentMenu = CurrentMenu.parent_menu;
								
				DeselectItem (old_item);
			} else {
				keynav_state = KeyNavState.Idle;
				SelectItem (item.Parent, item, active && item.IsPopup && popup_active && (CurrentMenu.SelectedItem != item));
			}
		}