Re: GtkCombo items?

[Mihai Bazon <mbazon websci ro>]

The GtkCombo structure contains a member named "list", which is a 
GtkList widget pointer (in fact, it is pointer to GtkWidget, but you can 
get the list using GtkList *ls = GTK_LIST(combo->list)).

This is basically a GtkListItem container.  So we study the GtkList 
structure:  it contains a member named "children", of type GList* (this 
is glib's double linked list).  This member is a list of GtkListItem*. 
The structure of this one could appear a little complicated. 
Inheritance looks like: GtkListItem is derived from GtkItem, which in 
turn is derived from GtkBin, which contains a member named "child", of 
type GtkWidget*.  This approach makes GtkList very flexible, in terms 
that it may contain any kind of widgets (although they are usually 
GtkLabel-s).  Hope my explanations are not very hard to follow, code 
below should clear the mess...

In conclusion, if your list contains only GtkLabel items (I mean, string 
values), you can get the string list by using the following code (or 
something similar):

GtkCombo *the_combo;
// ...
GtkList *the_list = the_combo->list;
GList *list_items = the_list->children;
GList *p = list_items;
GList *strings = NULL;
GList *si;

while (p != NULL) {
 GtkListItem *item = GTK_LIST_ITEM(p->data);
 GtkLabel *label = GTK_LABEL(GTK_BIN(item)->child);
 char *text = NULL;

 gtk_label_get(label, &text);

 if (text != NULL) {
   int len = strlen(text) + 1;
   char *new_text = malloc(len);
   memcpy(new_text, text, len); // do we have to do this way?
   if (strings == NULL) {
     strings = g_list_append(strings, text);
     si = strings;
   } else {
     si = g_list_append(si, text);
   }
 }
 
 p = g_list_next(p);
}

// hopefully, here you have all the strings in the "strings" list.

si = strings;
while (si != NULL) {
 const char *text = (const char*)(si->data);
 fprintf(stderr, "%s\n", text);
 si = g_list_next(si);
}

// free the allocated memory

g_list_foreach(strings, free, NULL);

Disclaimer: I did not test the above code.  I did not read any 
documents, except the header files, in order to give you this reply.  So 
I think I'm right, but I cannot guarantee it.  Sorry if anything goes 
wrong.  Also, please excuse me the C++-like style (variables should be 
declared at the beginning of block, for ANSI C :)

Cheers,
Mishoo

Janus N. Tøndering wrote:

> Dear Sirs,
>
> I've looked at the header files and the references found at
> developer.gnome.org but I cannot figure out how to get the list of
> strings in a standard GtkCombo. Could someone point me in the right
> direction?
>
> Thank you.
>
> --
> Janus N. Tøndering
> "Trying is the first step to failure" -- Homer Simpson
Or to success... :)   I rather think positive..

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> gtk-app-devel-list mailing list
> gtk-app-devel-list gnome org
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--

 ... and on the seventh day, He exited from append mode.