TTrayIcon with Lazarus 2.2+ on Linux with Mate
lazarus / 32-Linux

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mhart · 2021-11-09 12:09

Hi, Could you please advise me some way how to display an icon on
system tray (Fedora 35 with Mate desktop). It was possible building
app with Lazarus 2.0.12 GTK2, but this option is no longer supported
by Lazarus 2.2+. Thanks.

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JuhaManninen · 2021-11-09 13:19

Quote from: mhart on November 09, 2021, 01:09:09 pmHi, Could you
please advise me some way how to display an icon on system tray
(Fedora 35 with Mate desktop). It was possible building app with
Lazarus 2.0.12 GTK2, but this option is no longer supported by Lazarus
2.2+.
It is supported, even better than before. Explain more please.

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mhart · 2021-11-09 13:33

An app built with Lazarus 2.0.12 displays icon on system tray
perfectly, but the same app built with Lazarus 2.2 RC1 or RC2 does not
display the icon. I try it on ubuntu 21.10 and no icon as well, but if
app was built with Lazarus 2.0.12 it works perfectly. At Lazarus Wiki
about TTrayIcon says the behavior was changed in Lazarus 2.2.

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Gustavo 'Gus' Carreno · 2021-11-09 15:27

Hey MHart,

Could you please tell us if you attached a TPopUpMenu to the TTrayIcon
?

ATM I'm upgrading Ubuntu boxes and after that I'm finally gonna start
on my TestTrayIcon app that I've been putting off for a while.
I'm gonna host it on GitHub, so I'll link it here if I get any answers
to this question.

As you can see by my signature I'm on Ubuntu 21.10 also.

Cheers,
Gus

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Gustavo 'Gus' Carreno · 2021-11-09 15:33

Hey MHart,

BTW, when I get some answers for myself I'll also update this thread:
Why did the Tray Icon stop working with Ubuntu?.

I started it quite a while ago and then planned the TestTrayIcon
project but never got around to get to it.
So I'll keep both threads updated on my progress.
In the mean time have a read an try to see if any of the info already
relayed on that thread can help you.

Cheers,
Gus

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mhart · 2021-11-09 16:29

Hey Gustavo,

I attached a popupmenu to TTrayIcon and the icon is there, perfect!
Without attached popupmenu the icon appears if libindicator-gtk3 is
removed and libindicator-gtk2 installed, but Lazarus 2.0.12 works
perfectly in any case.

Thank you,
Mhart.

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Gustavo 'Gus' Carreno · 2021-11-09 16:53

Hey Mhart,

Quote from: mhart on November 09, 2021, 05:29:40 pmI attached a
popupmenu to TTrayIcon and the icon is there, perfect! Without
attached popupmenu the icon appears if libindicator-gtk3 is removed
and libindicator-gtk2 installed, but Lazarus 2.0.12 works perfectly in
any case.

Yeah, it was mentioned on the other thread I started, something about
the fact that now we need to have a TPopUpMenu for it to work.
What I wasn't aware is that you didn't need it on 2.0.12.

Need to get all that info in my TestTrayIcon project.

Quote from: mhart on November 09, 2021, 05:29:40 pmThank you,

You are most welcome!!

Cheers,
Gus

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JuhaManninen · 2021-11-09 19:39

See
 https://wiki.lazarus.freepascal.org/How_to_use_a_TrayIcon

LAZUSEAPPIND=NO
environment variable may be useful.

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dbannon · 2021-11-10 01:20

In the "new" but not necessarily "better" model, a tray icon MUST have
a popup menu and does not return, as separate events things like
double click, drag, right click.

Desktops like Mate do still support the old, richer, system tray model
but there is no guarantee that they will even the next release. So,
you are well advised to design your apps to use only the new model.

(Sadly) most of your linux end users will be using Gnome (no, I don't
know why) and it will not display the old model at all.

And, for the record, most newly released distros right now, on Gnome
are using libayatana-appindicator3 rather than libappindicator3.
Lazarus less than 2.2.* (or trunk) does not know about libayanta ! 
So, fail.

I am experimenting with a postinst script that creates a symlink, do
not like it, but ...

EDIT: I should have mentioned one of the reasons why the old systray
model will disappear is Wayland. Right now, its Gnome on Wayland, but
the others are expected to follow.

Davo