Hi Stefan, High-DPI infrastructure was introduced to GTK+3 last cycle:
http://blogs.gnome.org/alexl/2013/06/28/hidpi-support-in-gnome/ It should be completely transparent to your application. It works like HTML5 does, by making the "drawing pixel" different from the "device pixel". You can test on a low-DPI display by setting the GDK_SCALE envvar. Try running: $ GDK_SCALE=2 ./your-app and see if it's any different. Happy hacking! On Mon, Feb 10, 2014 at 11:59 AM, Stefan Salewski <m...@ssalewski.de> wrote: > Recently I ported an Ruby application to GTK3. It is working fine so > far, but it seems that for GTK3 still stuff like widget margins and > window borders are specified in pixels. (some sizes, like text entry > size, can be specified already in characters, which is fine) > > My application is in area of CAD > (http://www.ssalewski.de/PetEd.html.en), so it may be used with displays > of 200 DPI or more. Problem is, when a user has scaled text and widgets > sizes up, i.e. double the ordinary size. When I specify borders and > margins in pixesl, then it may look not really nice for 200 DPI with > scaled up widgets. I can offer the user a way to manually scale that > spaces, some sort of that scaling is already offered for cairo drawing > in my application, i.e. line width. But generally I would prefer > automatic scaling of widgets margins. LaTeX has sizes em and ex relative > to current font -- I think I can do something similar when I query users > default font size or users custom widgets size. For GTK3 label there > seems to be a method gtk_label_get_layout() and Pango offers methods to > query pixel size of that layout. That may work, I can calculate some > kind of ex and em values at program startup. (Unfortunately I am not > notified when user changes font size in gnome control center...) > > Are there betters solution? I.e direct access to users default font size > in x and y pixels? > > Best regards, > > Stefan Salewski > > > _______________________________________________ > gtk-list mailing list > gtk-list@gnome.org > https://mail.gnome.org/mailman/listinfo/gtk-list > -- Jasper
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