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MVC PROGRAMMING IN THE REAL WORLD

threads

• MIDI I/O probably happens in a thread other than the (main) GUI thread
• we require cross-thread mechanisms for Controllers and Views

notifying Views about Model changes

• basically, an anonymous callback system
• when the state of the model changes, invoke all registered callbacks for that change
• libsigc++
• QT ``signals/slots''
• GObject signal system

benefits

• anonymity:
  • the model doesn't know about the views, no UI code in "backend"
  • the views and controllers don't know about each other
• scalability: add/remove views or controllers without modifying model, or other views/controllers.