Re: GTK3 porting problem (clipboard)

[Jaroslav Šmíd <jardasmid gmail com>]

GtkTargetEntry targets[] = {
  {"text/html", 0, 0},
  {"text/plain", 0, 0}
};

size_t num_targets = sizeof(targets) / sizeof(targets[]);

// This IS required no matter what, or your program WILL BE broken
if (sizeof(size_t) > sizeof(guint) && num_targets > (size_t)G_MAX_GUINT) {
  // fail here because of stupid decision to use guint instead of size_t
  // this might get optimised away by compiler (condition is know to be 
false/true during compile-time
}

gtk_clipboard_set_with_data(clipboard, targets, (guint)num_targets, 
get_func, clear_func, data);

NOTE: you will get warning about conversion from const char* to char*. 
This is that even though this was reported as BUG years ago, once it was 
fixed and that fix was removed because it broke existing apps. Still, 
the could've fixed this for GTK3, but they didn't. Right way to do this 
would be either allocate string using strdup and than free it, or use 
something like this:

char target1[] = "text/html";
char target2[] = "text/plain";

// char *target = "blabla"; // this is NOT right

GtkTargetEntry targets[] = {
  { target1, 0, 0},
  { target2, 0, 0},
};

On 03/11/2011 08:55 AM, Miroslav Rajcic wrote:
> > You're right, but this seems odd. In the GTK3 version of the
> > documentation the basic structures GtkTargetEntry and
> > GtkTargetPair are still exposed in the API, and although
> > GtkTargetList is said to be opaque (a) it's unclear why this
> > should be so (it seems to be a trivial composite) and (b) the
> > functionality that was previously available via the struct itself
> > is not replicated via accessor functions. For example, there's no
> >
> > gtk_target_list_get_n_targets()
> >
> > to replace the original poster's GTK2 idiom:
> >
> > int nTargetCnt = g_list_length (list->list);
>
> Perhaps someone knows any workaround for what I am trying to do in my
> code or a way to implement this differently?
>
> The code does the following:
>
> //create a target list with text and HTML formats
> GtkTargetList *list = gtk_target_list_new (NULL, 0);
> gtk_target_list_add(list, atomTextHtml, 0, 0);
> gtk_target_list_add_text_targets(list, 0);
>
> //now I need to convert the target list to an array of the
> GtkTargetEntry structures as needed by gtk_clipboard_set_with_data
> int nTargetCnt = g_list_length (list->list);
> GtkTargetEntry *targets = g_new0 (GtkTargetEntry, nTargetCnt);
> int i=0;
> for (GList *l=list->list; l; l=l->next, i++)
> {
> GtkTargetPair *pair = (GtkTargetPair *)l->data;
> targets[i].target = gdk_atom_name (pair->target);
> }
>
> //set the clipboard with target formats
> gboolean bOK = gtk_clipboard_set_with_data(clipboard, targets,
> nTargetCnt, MyGtkClipboardGetFunc, NULL, 0);
>
> Basically the big problem is that gtk_clipboard_set_with_data API does
> not use GtktargetList directly.
>
> Regards,
> Miroslav
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