Re: Copying widget layout into a cairo layout

[Behdad Esfahbod <behdad behdad org>]

Try copying setting the font description of the label on your PangoContext. 
widget->style->font_desc.

On 06/11/2009 08:33 AM, Zoltan Boszormenyi wrote:
> Zoltan Boszormenyi írta:
> > Hi,
> >
> > I need to create a scrolling label widget.
> > I already succeeded marrying gtklabel and gtkimage,
> > I use a Cairo surface and created PangoLayout out of it,
> > I render the label text into the Cairo+Pango layout,
> > I use the expose method used by GtkImage to display
> > the pixbuf in the widget, and added a timer so the
> > pixbuf is scrolled in a double buffered way.
> >
> > Now, the problem is that the text rendered into the pixbuf
> > is much larger than the usual widget texts, like on stock
> > GtkButton and GtkLabel. I attached the screenshot from
> > my example application.
> >
> > How can I copy the PangoContext that a plain widget use?
> > E.g. the following code doesn't seem to work:
> >
> > =================================
> >    label->surface = cairo_image_surface_create_for_data(cairo_data,
> >                          CAIRO_FORMAT_ARGB32, width, height, rowstride);
> >
> >    label->cairo = cairo_create (label->surface);
> >
> >    label->layout = pango_cairo_create_layout(label->cairo);
> >
> >    /* This is the layout used by GtkLabel, etc. */
> >    layout = gtk_widget_create_pango_layout (GTK_WIDGET (label),
> >                                "This long string gives a good enough
> > length for any line to have.");
> >
> >    pango_cairo_context_set_font_options(
> >              pango_layout_get_context(label->layout),
> >
> > pango_cairo_context_get_font_options(pango_layout_get_context(layout)));
> >
> >    pango_cairo_update_context(label->cairo,
> > pango_layout_get_context(layout));
> >    pango_layout_context_changed(label->layout);
> >
> >    g_object_unref (layout);
> > =================================
> >
> > What is the proper way to get the same font, fontsize, etc. on a Cairo
> > layout?
> >
> > Thanks in advance,
> > Zoltán Böszörményi
>
> The following code also doesn't work, I get the same large font
> for my GtkScrollLabel that my previously attached screenshot showed:
>
>    label->cairo = cairo_create (label->surface);
>    pango_cairo_update_context(label->cairo, gtk_widget_get_pango_context
> (GTK_WIDGET(label)));
>    label->layout = pango_cairo_create_layout(label->cairo);
>
> Is there and easy way to render the text in the same size as
> GtkLabel's default?
>
> Thanks in advance,
> Zoltán Böszörményi
>
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