d_menu_proc (3) - Linux Manuals
d_menu_proc: Dialog procedure implementing a menu bar object. Allegro game programming library.
d_menu_proc - Dialog procedure implementing a menu bar object. Allegro game programming library.
int d_menu_proc(int msg, DIALOG *d, int c);
This object is a menu bar which will drop down child menus when it is
clicked or if an alt+key corresponding to one of the shortcuts in the
menu is pressed. It ignores a lot of the fields in the dialog structure,
in particular the color is taken from the gui_*_color variables, and the
width and height are calculated automatically (the w and h fields from
the DIALOG are only used as a minimum size.) The dp field points to an
array of menu structures: see do_menu() for more information. The top
level menu will be displayed as a horizontal bar, but when child menus
drop down from it they will be in the normal vertical format used by
do_menu(). When a menu item is selected, the return value from the menu
callback function is passed back to the dialog manager, so your callbacks
should return D_O_K, D_REDRAW, or D_CLOSE.