19.2 Cocoa-specific issues

19.2.1 The break gesture

If a CAPI/Cocoa window is busy and unresponsive you can use the break gesture Command+Ctrl+, (comma) to regain control.

19.2.2 The Cocoa application interface

You can use set-application-interface on an instance of a subclass of cocoa-default-application-interface to get the following functionality:

• Define the application menu (leftmost menu in the menu bar).
• Define the menu bar items that are displayed when no interface is on the screen.
• Define the Dock context menu, which is raised from the Dock icon.
• Control and callbacks about the lifecycle of the interface.

A proper Cocoa application is likely to use this mechanism. Note that the call to set-application-interface needs to happen before any display or attempt to access the screen. See cocoa-default-application-interface for more details.