Mouse scroll on system tray icon does not work

[TomaszGasior]

In oryginal RadioTray, when I scrolled by mouse wheel on system tray icon, I changed volume. In this RadioTray version this feature does not work, because of incompatibility with GTK3.

You should correct SysTray.py file in scroll event and use Gdk.ScrollDirection object.

def scroll(self,widget, event):
    if event.direction == Gdk.ScrollDirection.UP:
        self.mediator.volume_up()

    if event.direction == Gdk.ScrollDirection.DOWN:
        self.mediator.volume_down()