Event TrayIcon.Scroll (gb.dbus.trayicon)
Event Scroll ( Delta As Float, Orientation As Integer )
This event is raised when the user rotates the mouse wheel on the TrayIcon icon in the system tray.
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Delta is the amount of wheel rotation. It is negative if the wheel is rotated backwards.
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Orientation is the axe of the rotation, either the Horizontal or Vertical constant. It is usually Vertical, unless you have two wheels on your mouse.