Re: Get the default font in Gtk3

[rastersoft <raster rastersoft com>]

Ok, now I thing I got it. Thank you very much!!!!!!!!!


El 29/03/18 a las 16:28, Emmanuele Bassi escribió:
> On 29 March 2018 at 15:12, rastersoft <raster rastersoft com 
> <mailto:raster rastersoft com>> wrote:
>
>
>             [get the Gtk font type and size]
>
>             Ops, sorry: I'm reworking a backup utility that I wrote
>             (cronopete), and
>             I added a timeline with the backups (you can see an
>             screenshot at
>             http://www.rastersoft.com/cronopete_screenshot.png
>             <http://www.rastersoft.com/cronopete_screenshot.png> ). As
>             you can see, at
>             the left is the timeline and it has the days, months and
>             years. I think
>             those should use the same typography than the standard Gtk
>             widgets, but
>             reducing the size to 2/3. The same for the titles in each
>             "pseudowindow"
>             (they have a visual effect: they go forward and backwards
>             when you move
>             through the timeline).
>
>         ...I must be missing something here...
>         You can change font size in a layout. The scrolling might be
>         tricky, but
>         just eyeballing it, sounds like something that can be done by
>         showing
>         the layout twice at different coords in different clips
>         (cairo_save/cairo_restore brackets).
>
>         So...?
>
>         (Only thing I'm not quite sure about right now is if gtk fully
>         initializes
>         font description in a layout, cause I vaguely recall that it might
>         not... though maybe that was just wrt. theming API...)
>
>
>     Mainly the problem is that I'm using cairo_show_text... 
>
>
> That's the Cairo toy text API; you should only use it for tests or 
> small examples; it's basically useless for anything user-facing.
>
>     I presume that what you say is that I should replace all that with
>     Pango... Now I have some problems: first, I'm using vala and I
>     can't find the "get_pango_layout" from a widget. It exists
>     "create_pango_layout", so I suppose that this is the call I need
>     to create a layout.
>
>
> Yes, the function is `gtk_widget_create_pango_layout()`: 
> https://developer.gnome.org/gtk3/stable/GtkWidget.html#gtk-widget-create-pango-layout
>
>     Now the big question is: does ANY widget return the right layout,
>     or I must use a widget designed to contain text (like a Gtk.Label)
>     to get that layout, paint into it, and paste it in the final Cairo
>     canvas (which won't be the same canvas than the Gtk.Label from
>     which I created the layout)?
>
>
> All widgets that need to render text call 
> gtk_widget_create_pango_layout() internally, including GtkLabel.
>
> Ciao,
>  Emmanuele.
>
> --
> https://www.bassi.io
> [@] ebassi [@gmail.com <http://gmail.com>]