Re: Dynamic widget creation/destruction

[Olexiy Avramchenko <olexiy irtech cn ua>]

Russell Shaw wrote:

> Hi,
> When a bunch of widget objects are created such as in a dialog,
> do they need to be destroyed to free memory before returning?
> Does every widget need to be destroyed, or will destroying the
> top widget automatically destroy all the child widgets? What
> command to use for destroy?
>
> static void
> dialog_bg(void)
> {
>     GtkWidget* dialog=gtk_dialog_new_with_buttons("Grid Settings",NULL,
>       GTK_DIALOG_MODAL|GTK_DESTROY_WITH_PARENT,
>       GTK_STOCK_OK,GTK_RESPONSE_OK,
>       GTK_STOCK_APPLY,GTK_RESPONSE_APPLY,
>       GTK_STOCK_CANCEL,GTK_RESPONSE_CANCEL,
>       NULL);
>
>     GtkWidget *button=gtk_radio_button_new_with_label(NULL,"Grid");
>     gtk_widget_show(button);
>     GSList *group=gtk_radio_button_get_group(button);
>     GtkWidget *button=gtk_radio_button_new_with_label(group,"Dots");
>     gtk_widget_show(button);
>     gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->action_area),
>                         button, TRUE, TRUE, 0);
>     // run modal
>     gint result=gtk_dialog_run(dialog);
> ...
>     < destroy things here??? >
> }

They will be destroyed with a parent container.
When you create a widget it has a floating reference count, this stuff 
is well-explained here:
http://developer.gnome.org/doc/API/2.0/gtk/GtkObject.html (search on 
word "floating")

You can remove some lines from the code above by using:
button = 
gtk_radio_button_new_with_label_from_widget(GTK_RADIO_BUTTON(button), 
"Dots"); /* you dont need to handle radio group by hands */
gtk_widget_show_all(dialog); /* single call to show all children of 
container */

   Olexiy