The QCustomEvent class provides support for custom events. ... QCustomEvent  ( int type, void * data )  . ... QCustomEvent is a user-defined event type which contains a void*. ... It is not advisable to use QCustomEvent in normal applications, where other event types and the signal/slot mechanism can do the job. Constructs a custom event object with the event type type and a pointer to data. ... The event data can be anything and must be casted to something useful based on the event type . ...