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Re: [platform-dev] Linux: handle problematic GTK3 themes
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Hi Eric,
On 07/01/2019 16:21, Eric Williams wrote:
Hi Thomas,
On 1/7/19 4:30 AM, Thomas Singer wrote:
Hello,
It looks like some GTK themes cause more problems on Linux than
others, e.g. we have a couple of problems with Mint-X on Linux Mate 17.1.
According to <https://developer.gnome.org/gtk3/3.20/gtk-running.html>
it should be possible to change the theme of a certain application by
setting the environment variable GTK_THEME before launching the
application (ours usually is launched from a .sh script so adding the
"export GTK_THEME=..." line would be no problem). Unfortunately, this
does not work - it simply uses the default Mint-X theme.
We have support in SWT to read the GTK_THEME environment variable, so
this should work. How are you using it? IIRC the theme has to be
installed on the system in order for GTK_THEME to work.
In my Linux Mint installation I can select, e.g. "Clearlooks" in the GUI
for the controls. Adding
export GTK_THEME=Clearlooks
before launching SmartGit has no effect - it still uses the system
setting of Mint-X.
How do you actually manage the problems of different themes in
combination with SWT? Do you suggest the users to switch their system
theme? Do you abort the application with an error if a known buggy
theme is detected?
SWT only officially supports the default GTK theme (Adwaita). A lot of
themes follow the Adwaita style of declaring colors and other such
things so it's usually not an issue, however there are exceptions. In
these cases we do not try to fix issues in broken themes as there are no
manpower/resources to do so. It's not really SWT's responsibility to fix
broken GTK themes anyways.
From the user perspective it looks like the SWT-based applications are
broken, because native applications simply work. Usually, users also
don't want to change the system theme because it looks good for them and
they might have selected it because they like it.
That said, if your theme is "difficult" and causes issues in SWT, you
can feed some GTK CSS to SWT via the
org.eclipse.swt.internal.gtk.cssFile property. SWT will load the CSS in
this file at startup. I believe bug 527729 had some discussion on this
matter.
Thanks you.
Quite related: why some controls, e.g. buttons, in native GTK
applications look so different than the ones in a SWT application?
--
Best regards,
Thomas Singer
=============
syntevo GmbH
https://www.syntevo.com
https://www.syntevo.com/blog
MfG,