This class is used to allow nodes in a scene graph to handle input events. It is usually invoked from a component derived from SoXtRenderArea when the component receives a window system event.

Manipulator, dragger and selection nodes respond to and process events. Most other group nodes just pass the event to their children, while most other nodes simply ignore the action entirely. Once a node has indicated to the action that it has handled the event, traversal stops.

A node that handles an event can also grab future events. Once it has done so, all events will be sent directly to that node, with no traversal taking place, until the node releases the grab.