The pad button that was pressed.
the pad group the button belongs to. A %GDK_SOURCE_TABLET_PAD device may have one or more groups containing a set of buttons/rings/strips each.
The current mode of group. Different groups in a %GDK_SOURCE_TABLET_PAD
device may have different current modes.
%TRUE if the event was sent explicitly.
the time of the event in milliseconds.
the type of the event (%GDK_PAD_BUTTON_PRESS or %GDK_PAD_BUTTON_RELEASE).
the window which received the event.
Generated during %GDK_SOURCE_TABLET_PAD button presses and releases.