bionic (3) d_list_proc.3alleg4.gz

NAME

       d_list_proc - Dialog procedure implementing a list box object. Allegro game programming library.

SYNOPSIS

       #include <allegro.h>

       int d_list_proc(int msg, DIALOG *d, int c);

DESCRIPTION

       A  list  box  object.  This  will  allow  the user to scroll through a list of items and to select one by
       clicking or with the arrow keys. If the D_EXIT flag is set, double clicking on a list item will close the
       dialog.  The  index  of the selected item is held in the d1 field, and d2 is used to store how far it has
       scrolled through the list. The dp field points to a function which will be called to  obtain  information
       about the contents of the list. This should follow the form:

          char *foobar(int index, int *list_size);

       If index is zero or positive, the function should return a pointer to the string which is to be displayed
       at position index in the list. If index is negative, it should return NULL and list_size should be set to
       the number of items in the list.

       To  create  a  multiple  selection  listbox,  set  the dp2 field to an array of byte flags indicating the
       selection state of each list item (non-zero for selected entries). This table must be at least as big  as
       the number of objects in the list!

SEE ALSO

       exgui(3alleg4)