[SOLVED] Non functioning clipboard in Linux TrayIcon
lazarus / 31-LCL

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desliem · 2022-10-27 22:55

Text assigned to the Clipboard in a Linux TrayIcon cannot be pasted if
the main form was hidden in the OnShow event handler. However, text
set with
gtk_clipboard_set_text(gtk_clipboard_get(GDK_SELECTION_CLIPBOARD),
@mystring[1], -1) can be pasted.

It is best to hide the main form in the OnActivate event handler,
because the Clipboard can then be used without problem.

This behaviour was verified in Linux Mint Mate 20.1 and Linux Mint 21,
using Lazarus 2.3.0 (rev main-2_3-1602-gdb285860e3) FPC 3.3.1
x86_64-linux-gtk2. The problem has not been observed in Windows 10
using Lazarus 2.2.4 (rev lazarus_2_2_4) FPC 3.2.2
i386-win32-win32/win64. Other distros and other widgesets have not
been investigated.

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dbannon · 2022-10-28 01:01

Interesting observation.
Will almost certainly be Linux (or Unix) only, possibly GTK2 only
issue. All modern Linux Distros support only a limited subset of LCL's
SysTrayIcon these days, due to Gnome's war on screen clutter. But I am
surprised to see it affect the clipboard like that !

You might like to make a note on the wiki too,
https://wiki.freepascal.org/How_to_use_a_TrayIcon

Thanks for the well document report !

Davo

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desliem · 2022-11-01 01:09

Quote from: dbannon on October 28, 2022, 03:01:04 amYou might like to
make a note on the wiki too,
https://wiki.freepascal.org/How_to_use_a_TrayIcon

Before doing that, it seemed best to investigate some of the other
widget sets. As Davo suggested there is no problem with Qt5. However,
things got complicated when it came to Gtk3. It looks like the source
of the problem has nothing to do with TrayIcon. It could be a bug with
the TClipboard class  or, more likely, something wrong with how the
widget set was installed or used (see
https://forum.lazarus.freepascal.org/index.php/topic,61093.0.html).

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dbannon · 2022-11-01 23:25

Quote from: desliem on November 01, 2022, 02:09:45 amQuote from:
dbannon on October 28, 2022, 03:01:04 amYou might like to make a note
on the wiki too, https://wiki.freepascal.org/How_to_use_a_TrayIcon

Before doing that, it seemed best to investigate some of the other
widget sets. As Davo suggested there is no problem with Qt5. However,
things got complicated when it came to Gtk3. It looks like the source
of the problem has nothing to do with TrayIcon. It could be a bug with
the TClipboard class  or, more likely, something wrong with how the
widget set was installed or used (see
https://forum.lazarus.freepascal.org/index.php/topic,61093.0.html).

A simpler explanation might be that LCL's GTK3 TrayIcon code is based
heavily on the GTK2 version, if  thats the underlying cause, I am
afraid its down to me !

Both use the same libayana library so there is a lot of commonality
there ....

I am heavily committed right now but will look into it some time in
the not too distant future.

Davo