is there an Application which lets me preview all the Theme-Widgets at once?
Like in the old Ubuntu-tweak there was some sort of Preview of all Theme-button/slider/progressbar-layouts. But nowadays there isnt.
Can somebody help me with this?
You can just install the The Widget Factory with
sudo apt-get install thewidgetfactory
And run it in your terminal with
twf
The package has moved and is now called gtk3-widget-factory
.
$ sudo apt install gtk3-widget-factory
$ gtk3-widget-factory
I think what you're looking for is "The Widget Factory" or its somewhat newer version PyWF which is available from here: https://code.activestate.com/pypm/pywf/
You can try widget factory for gtk3
sudo apt install gtk-3-examples
gtk3-widget-factory