I need to compute the border sizes of a GtkFrame before the window containing
that GtkFrame has been realized. Precisely, I need the distances between the
GtkFrame container widget and its child. AFAICS, this isn't possible to get
before the GtkFrame has been realized. So I thought that I could use a workaround
that creates a top-level window, adds a GtkFrame with a GtkButton and computes
the size and destroys everything again. Here is the code:
void GTKFrameGetBorders(int *borderTop, int *borderOther)
{
GtkWidget *wnd = gtk_window_new(GTK_WINDOW_TOPLEVEL);
GtkWidget* labelwidget = gtk_label_new_with_mnemonic("Foo");
gtk_widget_show(labelwidget);
GtkWidget* framewidget = gtk_frame_new(NULL);
gtk_frame_set_label_widget(GTK_FRAME(framewidget), labelwidget);
GtkWidget *btn = gtk_button_new();
gtk_widget_show(btn);
gtk_container_add(GTK_CONTAINER(framewidget), btn);
gtk_container_add(GTK_CONTAINER(wnd), framewidget);
gtk_widget_show(framewidget);
// !!! THIS CALL IS NECESSARY TO GET CORRECT VALUES !!!
gtk_widget_realize(labelwidget);
GtkAllocation alloc, child_alloc;
gtk_widget_get_allocation(framewidget, &alloc);
GTK_FRAME_GET_CLASS(framewidget)->compute_child_allocation(GTK_FRAME(framewidget), &child_alloc);
*borderTop = child_alloc.y - alloc.y;
*borderOther = child_alloc.x - alloc.x;
gtk_widget_destroy(wnd);
}
This seems to do the job and returns the correct values but of course it's a
really hackish solution. So I've got two questions:
1) Is there a better/cleaner solution? :)
2) Is it allowed to call gtk_widget_realize() on the "labelwidget" as done above? The
docs say that gtk_widget_realize() is propagated upwards so does this mean that
gtk_widget_realize() will end up being called on the top-level window which means
that the top-level window will be shown very briefly? That's of course something
I'd like to avoid...
I'm targetting GTK+ 2.
Thanks for any suggestions!
--
Best regards,
Andreas Falkenhahn mailto:andreas@xxxxxxxxxxxxxx
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