Re: GTK & Pango string measurement

[Wesley Smith <wesley hoke gmail com>]

In the situation I'm talking about, there is no GtkWidget object so
your technique won't work.  This is the code I'm going off of
actually.  Thus my question is how can I get a pango context from  a
GtkCellRendererText?

wes

On Tue, Sep 15, 2009 at 11:16 PM, Ken Resander <kresander yahoo com> wrote:
>
> I also had a similar problem. Here is how I ended up doing it...
>
>
> extern GttWidget * curdlg;  // of current dialog
>
> void gettextwdht ( char * family , int ptsize , int weight , bool normalstyle ,
>                    char * stringtomeasure ,
>                    int * wdret , int * htret )
>    {
>    PangoFontDescription * fd = pango_font_description_new ( );
>
>    pango_font_description_set_family (fd, family );
>    pango_font_description_set_style (fd, normalstyle ? PANGO_STYLE_NORMAL :
>                                                        PANGO_STYLE_ITALIC );
>    pango_font_description_set_variant (fd, PANGO_VARIANT_NORMAL);
>    pango_font_description_set_weight (fd, (PangoWeight)weight );
>    pango_font_description_set_stretch (fd, PANGO_STRETCH_NORMAL);
>    pango_font_description_set_size (fd, ptsize * PANGO_SCALE);
>
>    PangoContext * context = gtk_widget_get_pango_context ( curdlg ) ;
>
>    PangoLayout * layout = pango_layout_new ( context );
>    pango_layout_set_text ( layout, stringtomeasure, -1 );
>    pango_layout_set_font_description ( layout, fd );
>    pango_layout_get_pixel_size (layout, wdret , htret );
>    g_object_unref ( layout );
>    }
>
> You can 'borrow' any widget for this (I think). It worked with a dialog widget for me.
>
> I really wanted a PangoContext that is not associated with a widget, so the calculations can be carried out totally 'offline'. I could not see how to do that.
> If anyone knows, I would be interested in finding out.
>
> P.S. The code shown above combines getting a font and measuring it. The actual code I am using splits these into two steps for efficiency.
>
> ----
> Hi,
> I'm banging my head trying to figure out how to measure the text width
> of a string to be displayed in a GtkCelRendererText.  From the code
> I've found, I need a PangoContext and GtkCelRendererText has plenty of
> Pango properties but none that return a PangoContext.  In addition,
> GtkCelRendererText is not a GtkWidget, so I can't use
> gtk_widget_get_pango_context().  I'm at a loss as to how to do this.
> Any ideas?
>
>
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