To use this facility, a menu procedure should first be defined, as explained above. Next, add a call to this procedure in the required title strings, using an embedded PRoc command. Finally, activate the updating process with MENU CALLED. When the user selects the chosen item, your procedure is repeatedly accessed by the menu system.
Because menu items are not double buffered, bobs may flicker a little, but the use of computed sprites will present no such problems.
MENU ONCE
instruction: turn off automatic re-drawing
Menu Once(single item parameters)
MENU ONCE turns off the automatic updating system instigated by MENU CALLED. After the command is given, each menu item will only be re-drawn once when the menu is called on the screen. It is used like this:
X> Menu Once(1,1)