DC A wrote:
[...]
Why we cast for the first argument of this function but not the second one?
It seems a little wierd, but eventually you find that its just easier to
generalize where you can:
/* gtk_button_new & gtk_vbox_new return `GtkWidget *',
* not `GtkButton *'
*/
GtkWidget *vbox = gtk_vbox_new (FALSE, 0);
GtkWidget *button = gtk_button_new ();
/* Here we cast our `GtkWidget *vbox' to GTK_BOX to suit
* the api, most gtk functions take GtkWidget arguments
* (well, at least most container implementations do), so
* its just easier to declare every widget as `GtkWidget *'
* and not its subclass.
*/
gtk_box_pack_start (GTK_BOX (vbox), button, TRUE, TRUE, 0);
Cheers,
-Tristan
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