Upon launching QSyncthingTray
without any panel/trayer running, it displays an error dialog:
I couldn't detect any system tray on this system.
[ OK ]
and exits upon pressing [ OK ]
.
Curiously though, if I have QSyncthingTray
already running as a tray icon and kill my panel, QSyncthingTray
doesn't quit, and upon restarting the panel QSyncthingTray
is still there...
For my ~/.xsession
& ~/.xinitrc
startup, I'd like to add a looped check whether a tray is present, pseudocode:
loop:
if system-tray.is-available:
run QSyncthingTray
done
else sleep 1
How do I do the if system-tray.is-available
?
The preferable language is Perl
, also interested in Raku
and POSIX sh
.
Other languages are welcome as well.
QSyncthingTray
uses isSystemTrayAvailable() from Qt c++ lib.
You can do the same.
is_tray_available.cpp:
// program that exits with zero code when tray is available
// when not available (or program crashes) it should return non-zero
#include <QApplication>
#include <QSystemTrayIcon>
int main(int argc, char** argv)
{
QApplication app(argc, argv);
if(QSystemTrayIcon::isSystemTrayAvailable()) return 0;
else return 1;
}
QT is unique in that you need to use a full-blown build system to build programs using it:
is_tray_available.pro
:
QT += widgets
TARGET = is_tray_available
SOURCES += is_tray_available.cpp
Save both files in the same dir, execute qmake
, make
and voilĂ , you have an executable that you can use in a shell script.