Popup Menus

• Ability to popup a menu at a particular place on the screen
• Usually used with graphics primitives allowing one the ability to place a menu on any part of the screen
• The popup menu may either be a submenu (but not a pull down menu)
• An option in the wcreate allows the creation of a popup menu also

popup(Menu,Item, SMenu, SItem)
popup(Menu,Item, SMenu, SItem, (Y,X))
popup(Menu,Item, SMenu, SItem, GWin(Y,X))

where

• Item - which is the name of the menu item to be preselected,
• SMenu will be name of the selected menu and SItem is the name of the selected item,
• (Y,X) is a pair of integer specifying the position where the menu appears - if not specified - menu appears at the position of the mouse
• GWin the name of the graphics window, and the (Y,X) specify the point where the window appears in the coordinate system of the graphics window

  
Figure 14: The Query Dialog