More info from Apple about the changes to Carbon in Lion (Rev is still
a Carbon based application)
Carbon Framework Release Notes
This document describes new features and issues with the Carbon
framework in Mac OS X v10.7.
Transparent Application Lifecycle
Persistent State
All Carbon applications support Persistent State restoration across
logout/shutdown and login automatically or when the user selects "Quit
and Keep Windows" menu item from the application menu. When this menu
item is chosen, the OS records a list of all open disk-based documents
to re-open at next launch. In addition to the standard state like
window size, position and toolbar visibility, your application can
preserve custom state such as current selection. See SetWindowProperty
and ChangeWindowPropertyAttributes, the attribute
kWindowPropertyPersistent, andkEventWindowRestoredAfterRelaunch.
Sudden Termination
When Sudden termination is enabled (either using the
NSSupportsSuddenTermination key in the application’s Info.plist file
or the NSProcessInfomethod enableSuddenTermination), the app can be
terminated immediately, without sending the kAEQuitApplication
AppleEvent. Sudden termination is automatically disabled when a
window’s close box shows the modified state indicator (via the
SetWindowModified API).
Automatic Termination
An application may adopt the automatic termination capability by
adding the NSSupportsAutomaticTermination key to its Info.plist. The
application’s File menu automatically gains a "Close All" menu item
which uses the new kHICommandCloseAll and dispatches a
kEventWindowCloseAll event. Your application should implement
kEventWindowCloseAll to prevent multiple sheets for unsaved changes
and allow the user to review unsaved changes in each document singly.
With no visible documents and when deactivated, such applications may
be converted to UIElements, disappear from the Dock or application
switcher, and be terminated to recover memory. If termination should
not occur (due to background task), the application may
useNSProcessInfo methods disableAutomaticTermination and
enableAutomaticTermination.
Scroll Bars
Carbon now uses the new overlay scrollbar appearance for the standard
scrollbar control and for scrollbars drawn with the HITheme API.
Carbon does not support the automatic scrollbar hiding behavior
provided by AppKit; for Carbon applications, the scrollbars will
always remain visible.
Known Issues
There are a few issues with Carbon in the current seed. There is no
need to file bugs on these specific problems:
• Window close/minimize/zoom buttons are positioned too low in the
window title bar.
• Resizing a window from any edge or corner is only available for
compositing windows.
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