Icon for linux application

[atom_352]

Hello, how could i add icon for my app? I need the icon to be displayed in the system tray when launched, I am writing the application for Ubuntu and other Linux systems, my build system is cmake, and the language is C++ (I don’t know if this is important)

[Pl45m4]

@atom_352

This also works

{
    ui->setupUi(this);
    QMainWindow::setWindowIcon(QIcon("qrc:/new/icons/img/information.png"));
}

Because at startup the taskbar still displays the standard icon

If you want to have your icon as "shortcut" / desktop icon on Linux you need to follow @JonB 's solution in the topic linked by @jsulm above.

[jsulm]

@atom_352 See https://forum.qt.io/topic/102167/how-to-add-qt-application-icon-in-ubuntu

[atom_352]

@jsulm , i tried somthing from that, but probably did something wrong, I think I didn’t really understand where to write this and how to point to an image if it is in .qrc resources

[jsulm]

@atom_352 Did you try QMainWindow::setWindowIcon(), I think this is what you need and you can use an icon embedded in a rosource file.

[atom_352]

@jsulm , Yes, I tried to use exactly this, but where can I write this, and is it necessary to use the qicon class?

[Pl45m4]

@atom_352 said in Icon for linux application:

but where can I write this

Anywhere ;-)
But I don't think your neighbors will like you if you paint that on their door.

However, to set your MainWindow icon you need to write it in a function that is called when creating your QMainWindow :)

is it necessary to use the qicon class

You can construct a QIcon from file, either QRC or directly from file string.

[atom_352]

@Pl45m4 Thanks!! But should it look like this?

mainwindow.cpp

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    icon();
}

void MainWindow::icon()
{
     QMainWindow::setWindowIcon(QIcon("qrc:/new/icons/img/information.png"));
}

Because at startup the taskbar still displays the standard icon

[Pl45m4]

@atom_352

This also works

{
    ui->setupUi(this);
    QMainWindow::setWindowIcon(QIcon("qrc:/new/icons/img/information.png"));
}

Because at startup the taskbar still displays the standard icon

If you want to have your icon as "shortcut" / desktop icon on Linux you need to follow @JonB 's solution in the topic linked by @jsulm above.

[atom_352]

@Pl45m4 Ok! Finally, i understand, thank you so much

[SimonSchroeder]

I am using AppImages (created with linuxdeploy and linuxdeployqt) to have portable applications. These rely on a .desktop file which is supposed to be portable between KDE and Gnome (and hopefully other desktop environments). The .desktop file plays together with the xdg-utils. You can install these with xdg-desktop-menu or xdg-desktop-icon. I'd expect that through this they would also immediately show the icon in the taskbar when launched this way. (You can even register file extensions with xdg-mime and than open file with the associated program with xdg-open–much like macOS's open command.)

If I am not mistaken, this is the official link for .desktop files: https://specifications.freedesktop.org/desktop-entry-spec/latest/index.html

[eman086]

To add a system tray icon in a C++ app on Ubuntu/Linux using CMake, you can use libappindicator or Qt (if using Qt framework). Here's a short summary:

Use libappindicator for GTK-based apps:

Install: sudo apt install libappindicator3-dev

Link in CMake: target_link_libraries(your_app appindicator3-0.1)

Set icon: app_indicator_set_icon_full(indicator, "icon-name", "description");

Or use Qt:

Use QSystemTrayIcon and set icon with setIcon(QIcon(":/icon.png"));

Make sure the icon file is included in your build and accessible at runtime.