It sounds to me more like the Smalltalk version of OOP in which Objects send messages to each other - and Smalltalk is where the term Object-Oriented Programmin

It sounds to me more like the Smalltalk version of OOP in which Objects send messages to each other - and Smalltalk is where the term Object-Oriented Programming originates. Event-driven programming has Event handlers (not objects) that pick up specific events. Events aren't messages to a specific Object.