Translations:Code snippets/17/en

The following event types are supported
 * SoEvent -- all kind of events
 * SoButtonEvent -- all mouse button and key events
 * SoLocation2Event -- 2D movement events (normally mouse movements)
 * SoMotion3Event -- 3D movement events (normally spaceball)
 * SoKeyboardEvent -- key down and up events
 * SoMouseButtonEvent -- mouse button down and up events
 * SoSpaceballButtonEvent -- spaceball button down and up events