d_list_proc(3) Allegro manual d_list_proc(3)NAMEd_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 dia‐
log. 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 ALSOexgui(3)Allegro version 4.4.2 d_list_proc(3)
