Make tray icon themeable

[andia89]

Steps to reproduce

1. Open telegram on Linux
2. Enable tray icon

Expected behaviour

Icon from generic place like /usr/share/icons/hicolor is used instead of a hardcoded one, so that different icon themes can provide tray icons for telegram instead of a hardcoded png.

Actual behaviour

An icon that is hardcoded in the binary is used, with absolutely no way to change apart from building telegramDesktop from source with changed png files...

Configuration

Ubuntu 15.10 with appindicator installed

Telegram version 0.9.33

[auchri]

Shouldn't #1431 fix this issue?

[andia89]

I don't think so because this is only for the app icon (the icon that shows up in the unity launcher for example), whereas the tray icon is still hardcoded.

If I made a pull request, is this something you would consider merging?

EDIT: Relevant #419

[auchri]

Duplicate #1199

If I made a pull request, is this something you would consider merging?

Yes, a PR would be great 👍

[john-preston]

What will happen with the coloured unread counters that are placed upon the icon (currently red or grey, depending on the muted status of the conversations with a positive unread counter)? They will be placed that way above an arbitrary tray icon?

[andia89]

I suppose that's up to the icon theme to decide. If they ship icons for all different states, they should show up

[john-preston]

@wa4557 I just don't understand (and afraid a bit) how this is going to look in the pull request — the counter is added uniformly there using internal styles.

[andia89]

Is it? As far as I understand the code there are a lot of different png files for all different counter values. So for me there's not really a difference if this is done internally (this will be the fallback oc), or via an icon theme

I could be wrong though, and misunderstand the code...

[DavidVentura]

Any news on this? Plasma uses the theme icon but the status bar still shows the original blue icon

[auchri]

@wa4557 Did you make some progress on this issue?

[andia89]

Ah yeah I thought I commented on that. I coded around only to find out, that this wont work. The problem is that telegram doesn't use system Qt libraries, which consequentely means that the icon theme used is not recognized (I'm not sure how this is done by system Qt).

So this means that I was not able to use icons from hicolor or other icon themes

[DavidVentura]

Would you at least keep/distribute a directory named 'icons' with the icon? Also embed the default icon in the binary as it's done now in case the icon gets deleted. While this won't work with general themes, at least the interested users can switch the icon.

Maybe don't even ship the icon, but load it on launch if it's present.

[auchri]

@wa4557

The problem is that telegram doesn't use system Qt libraries, which consequentely means that the icon theme used is not recognized (I'm not sure how this is done by system Qt).

But it works for the app icon .. ? #1431

[andia89]

Well that's a different story.

In order for telegram using system tray icons, I need the QIcon::fromTheme method, which as I said doesn't work with non system Qt libraries.

For the app icon it is as simple as changing a line in the .desktop file from Icon=/path/to/a/hardcoded/icon.png to a simple Icon=telegram the rest is done by the DE.

EDIT: I would argue, that line L524 in your linked commit could be deleted, the important thing is L1199

@DavidVentura Yeah this might work. This used to work on Ubuntu but Unity doesn't use AppIndicator anymore, and the icons are created on the fly by the program. I guess this could be changed though