OneDisplay

Technical skills demonstrated in this project

• Core display management

  • Uses CGDisplayCapture to take exclusive control of the built-in display, rendering it black and inactive when an external monitor is connected.
  • Monitors display connection/disconnection via NSNotificationCenter and restores the laptop screen on disconnect.
  • Clamshell-aware: blanking respects whether the laptop lid is open or closed.

• Menu bar app

  • Lightweight menu bar utility with SwiftUI for the popover and AppKit for display management.
  • Launch at Login support via SMAppService (macOS 13+).
  • Hide icon mode — runs silently in the background.
  • Handles sleep/wake events gracefully, re-blanking on wake if a monitor is still connected.

• Build & dependencies

  • Pure Swift — zero external dependencies.
  • Makefile-based build system with targets for build, bundle, run, and icon generation.
  • MIT licensed, supports Apple Silicon and Intel Macs on macOS 13+.