XnView Software

:~$ xnview -platformtheme gtk2
Cannot mix incompatible Qt library (version 0x50902) with this library (version 0x50903)


The error message says that you have on your system a mix of two versions of Qt: 5.9.2 and 5.9.3.

I suggest you uninstall XnView 0.88 (and remove the /opt/XnView directory ...

sissou wrote:Perhaps I have to compile qt5-style-plugins package : debian version is 5.0.0...

Same version on Ubuntu 16.04. So the problem is not here.

sissou wrote:Debian Stretch 64 with XFCE.

So you have Qt 5.7.1, unless you have installed a newer version.
My workaround works on Ubuntu 16.04 (with XFCE4 and Qt 5.5.1) and on Ubuntu 17.10 (with Gnome3 and Qt 5.9.1).
Strange that it doesn't work for you

What system do you use?

sissou wrote:But it does not work with XNView...

Here is a workaround for now (works on Ubuntu 16.04 and 17.10):

1. Download the attached lib.tar.gz and extract it in your XnView directory (for example in /usr/local/XnView)

2. Launch XnView as:

xnview -platformtheme gtk2

and you should get the system theme.

i means this file
could you try to extract this file in XnView/lib/platformthemes/

OK, it works, but only when the library libqgtk2style.so is also contained in the directory XnView/lib/styles, and when launching:

xnview -platformtheme gtk2

Note that, in this case the system icon theme is not ...

xnview wrote:

roland65 wrote: 4. Copy 'libqtgk2.so' into <install_directory>XnView/lib/platformthemes

and the one that i've built doesn't work???

With version 0.88 you only provided libqgtk3.so and xnview -platformtheme gtk3 doesn't work.

I found another way to get the system themes applied when using XnView 0.88. Here are the steps:

1. Download the sources of the qt5-style-plugins package (see attached qtstyleplugins-src-5.0.0.tar.gz tarball)
2. Compile the package using Qt 5.9.2 (or use the attached lib.tar.gz tarball that ...

after installing adwaita-qt, i have themes subfolder in qt5/plugins
you can search for adwaita.so?

On Ubuntu 17.10 (artful aardvark), the adwaita.so library is located in /usr/lib/x86_64-linux-gnu/qt5/plugins/styles
So I copied the directory /usr/lib/x86_64-linux-gnu/qt5/plugins/styles to /opt ...

xnview wrote:If you copy /usr/lib/x86_64-linux-gnu/qt5/plugins/themes in lib folder of XnView, it works!

I don't have such a folder. Do you mean /usr/lib/x86_64-linux-gnu/qt5/plugins/platformthemes ?

I've tried 'speedcrunch -style Adwaita-dark', and i have 'QApplication: invalid style override passed, ignoring it.' too
If i set Adwaita-dark, speedcrunch use it own theme :(

Do you use 'global dark theme'?

As I explained in another message:

I did some research on the Internet and found that ...

xnview wrote:but why is it written? "GTK+ 2 versions of the Adwaita and High Contrast themes"

I don't know!

If you don't trust me (and I understand), just do this:

cat /usr/share/themes/Adwaita/gtk3/gtk.css

You'll get this:

/* Adwaita is the default theme of GTK+ 3, this file is not used */

[quote="xnview"but it's a gtk 2 theme
https://launchpad.net/ubuntu/+source/gnome-themes-standard[/quote]

No, Adwaita is a GTK 3 theme. It's indeed 'the default GTK3 theme'. I guess the gnome-themes-standard package (and its associated package gnome-themes-standard-data) is a compatibility package ...

xnview wrote: yes done, but i don't have Adwaita-dark

OK, I got the point: you have to install the package gnome-themes-standard. Then you'll have the Adwaita and Adwaita-dark themes.

Hi Pierre,

in Ubuntu, you have to install the gnome-tweak-tool package. Then launch this tool and in the Appearance tab you will find the default themes and you can switch between them.

Linux Mint uses the Cinnamon desktop, so I don't know if these instructions apply...