Re: gtk3 (GtkTextView) and MacOS

[Jim Charlton <charltn gmail com>]

I had a similar problem with gtk3 and gtkmm3 programs on MacOS X 
(Yosemite) and Linux (Ubuntu).  I am using jhbuild to install the 
gtk/gtkmm libraries on the Mac.  The UI looks fine on Linux but not so 
good on the Mac.  The problem appears to be the "theme".

On linux (Ubuntu), using libgtkmm-3.0-dev, compiled programs can have 
their themes changed with Tweak Tool. Having chosen the Ambiance theme, 
I can edit /usr/share/themes/Ambiance/gtk-3.0/gtk.css to "@import 
url("gtk-main.css");" and then edit 
/usr/share/themes/Ambiance/gtk-3.0/gtk-main.css to customize the theme.

I found (eventually) that I could do the same on the Mac if I set the 
environment variable
XDG_CONFIG_HOME=/path/to/theme/gtk-3.0/ (I am not sure where your themes 
are installed using MacPorts. Perhaps /usr/share/themes/Ambiance or 
whatever).
prior to executing the program. The selected (and perhaps edited) theme 
is then used over the embedded default.
If memory serves me correctly... I was able to copy themes from Linux to 
the Mac and use them.

jim...   JIm Charlton


On 15-02-24 11:18 PM, Roger Davis wrote:
> Hi all,
>
> I have an application suite built on gtk3 which is targeted at both 
> Linux (specifically CentOS 6 and 7) and MacOS X (Yosemite). Although 
> the software is usable under MacOS I am having an ugly cosmetic 
> problem there with my GtkTextView widgets, and other visual details 
> are also not consistent with CentOS Linux. I suspect this is due to an 
> incomplete or misconfigured gnome3 theme/font installation under 
> Yosemite. (I am using the MacPorts gtk3/gnome packages.) I am hoping 
> that someone here can give some advice on what gnome3 packages I need 
> to install and configure to at least solve my GtkTextView problem.
>
> Under Linux my GtkTextView widgets display text nicely with consistent 
> and adequate spacing between successive lines of text. There appears 
> to be a very consistent 2 or 3 pixels of white space between the 
> lowest descenders of line N and the highest ascenders of line N+1. 
> Under MacOS, however, the descenders from line N actually touch the 
> ascenders of line N+1 and the text is thus hard to read. Furthermore, 
> line spacing is not always consistent -- lines with the unicode 
> sequence \342\206\222 (right-arrow) have 2 or 3 pixels of additional 
> inter-line spacing after the preceding line. (That spacing is actually 
> perfect, but I want it for *every* line.)
>
> There appear to be no relevant gtk_text_view_XXX() functions 
> controlling inter-line spacing, so I assume this problem is all about 
> something that is broken with my gnome3 theme and/or font installation 
> under MacOS. Does anyone have any idea of what this might be?
>
> I would very much prefer to configure a gnome3 installation under 
> MacOS that is as lightweight as possible. No gtk3 apps other than my 
> own are running, and I don't want to force users to have to cope with 
> the gnome3 UI any more than is necessary, although if there was a way 
> for them to select their own theme (especially with regard to font 
> sizing within GtkTextView and other dialog panel widgets) that would 
> be a big plus. Another reason for a lightweight gnome3 environment is 
> that I've so far been unable to even install the full MacPorts gnome3 
> package set (due to a problem with the mojs17 port which seems to be a 
> required dependency for many of the gnome3 packages), and I've read 
> that many people who did manage to install a full-featured gnome3 
> under MacOS never got it to operate.
>
> Following is a list of gtk3- and gnome-related MacPorts packages which 
> are now installed on my system, and which are clearly sufficient to 
> build my software and run it, albeit with these annoying cosmetic issues:
>
> > port list installed | grep gnome
> adwaita-icon-theme             @3.14.1 gnome/adwaita-icon-theme
> at-spi2-atk                    @2.14.1         gnome/at-spi2-atk
> at-spi2-core                   @2.14.1         gnome/at-spi2-core
> gnome-backgrounds              @3.14.1 gnome/gnome-backgrounds
> gnome-icon-theme               @3.12.0 gnome/gnome-icon-theme
> gnome-themes-standard          @3.14.0 gnome/gnome-themes-standard
> gobject-introspection          @1.42.0 gnome/gobject-introspection
> gtk2                           @2.24.25        gnome/gtk2
> gtk3                           @3.14.5         gnome/gtk3
> hicolor-icon-theme             @0.14 gnome/hicolor-icon-theme
> icon-naming-utils              @0.8.90 gnome/icon-naming-utils
> libcroco                       @0.6.8          gnome/libcroco
>
> Can anyone recommend any other packages which are necessary to get my 
> GtkTextView objects to display better-looking text? Is there any 
> necessary user-environment configuration, e.g., environment variables 
> or config files stashed in ~ or elsewhere? (I did try copying the 
> ~/.config directory from a CentOS 7 system with a functional 
> full-blown gnome3 environment, but that didn't make any difference.) 
> Are there any gnome3-related system processes which must be running 
> before I start a gtk3 app if I want the latter to conform to any 
> particular theme, etc.? I am starting my apps simply by invoking them 
> directly from a MacOS Terminal, which then implicitly starts XQuartz 
> (2.7.7). I've made no effort to specifically launch any gnome3-related 
> system process other than the following commands which were 
> recommended by the MacPorts installation chatter at gtk3 package 
> installation time:
>
>    % sudo launchctl load -w 
> /Library/LaunchDaemons/org.freedesktop.dbus-system.plist
>    % launchctl load -w 
> /Library/LaunchAgents/org.freedesktop.dbus-session.plist
>
>
> Any ideas? Thanks!
>
> Roger Davis
> Univ. of Hawaii
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