Re: Computing border size of GtkFrame

[Igor Korot <ikorot01 gmail com>]

Hi, Andreas,

On Wed, Mar 23, 2016 at 11:34 AM, Andreas Falkenhahn
<andreas falkenhahn com> wrote:
> 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:

What is it that you are trying to accomplish/achieve?
Maybe this is possible in some other way?

Thank you.

> 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 falkenhahn com
>
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