Event Architecture - Cocoa Event Handling Guide - Apple Developer

Event ArchitectureThe path taken by an event to the object in a Cocoa application that finally handles it can be a complicated one. This chapter traces the possible paths of events of various types and describes the mechanisms and architectural designs for handling events in the Application Kit. For further background, About OS X App Design in Mac App Programming Guide is recommended reading. How

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Event Architecture Responder Chain for Action MessagesFor action messages, the Application Kit constructs a more elaborate responder chain that varies according to two factors:Whether the application is based on the document architecture and, if it isn't, whether it uses NSWindowController objects f