On 21.02.2018 16:55, Robert Marcano wrote: > Greetings. I have been playing with the developers guide example  for > embedding LO inside a Java window (Swing toolkit). The example works on > a Windows host, but on Linux I found the following problems (in the > order I found) > > 1- When the host Java application is running on a Wayland session (Java > Swing is still an X11 program), there is a crash. IIRC LO still is a X11 > based application (or at least the Fedora compiled version is using the > X11 GTK back-end) > > 2- Switched to an X11 desktop session, there was no crash this time, but > the document was not shown embedded on the Java window, it was a > floating window with no window controls, unresponsive to the user. > > 3- Run the same application with the environment variable > SAL_USE_VCLPLUGIN=gtk in order to force the LO GTK2 back-end. The > document is embedded on the Java window as expected, but keyboard input > is not possible on the document or the controls, mouse actions works, > for example, I can change fonts using the mouse, but can't write > anything on the font combobox nor the document. New LO dialogs opened > from that document, keyboard input works. > > 4- Trying with SAL_USE_VCLPLUGIN=gen and keyboard input now works, but > with the outdated look of that LO VCL backend :( > > So now the possible reasons that came to my head for each case: > > 1- Some confusion between Java being X11 and LO trying to do some > Wayland thing?
by default the "gtk3" vclplug will use Wayland if available. probably this won't work if the Java connects to X11 instead. there is some environment var GDK_BACKEND=x11 that can be used to force it. > 2- Java has a GTK Look and Feel/theme that loads GTK2 (the example > application does not load that theme) , I am under the impression that > if LO is loading GTK3, they are on different processes, so should not be > any conflict here. AFAIK GTK 2 and GTK 3 cannot coexist in the same process, due to some naming conflict of GObjects or so... > 3- Now both processes should be using GTK2, but the problems with > keyboard input is a blocker that sounds like a bug somewhere. (unlikely to get fixed any time soon given this is quite an esoteric use-case.) > 4- Everything running without conflicting libraries/protocols (Wayland > vs X11 or GTK3 vs GTK2) and work, but the look and feel!!!!!! > > Now, when running the example with a no inline option, everything works > fine, even when GTK2 and GTK3 are mixed. Wish to have an option to > create the new document top level window as a child of the Java window, > it is a pain for user that the document can go to the back of the > "caller" window. Any hints if this is possible between two processes > like Java and LO? so does that option run LO as a separate process? yes, that would avoid some of these issues, but as you found you get different issues instead :-/ _______________________________________________ LibreOffice mailing list LibreOffice@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/libreoffice