Re: Copying widget layout into a cairo layout

[Zoltan Boszormenyi <zboszor freemail hu>]

Hi,

thanks very much, the font now is the same, but it's still a bit larger,
see the attached picture. Is there some other option I can apply?

Thanks in advance,
Zoltán

Behdad Esfahbod írta:
> 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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>
>