tag

#responder-chain

2 posts

macOSDeep Dive October 3, 2026 8 min read

AppKit Responder Chains: First Responder, Actions, and Keyboard Routing

Debug AppKit input by tracing first-responder changes, nil-target actions, key-view traversal, text interpretation, and menu validation.

#macos#appkit#responder-chain

macOSDeep Dive October 3, 2026 6 min read

NSMenuItem Validation on macOS: Enable Commands From Real State

Keep AppKit menus truthful with responder-chain validation, inexpensive menu updates, clear command ownership, and tests for changing selection and document state.

#macos#appkit#menus