Programmer's Reference
Common Printing uses the callback mechanism to inform applications of
events related to the printing process. Callbacks are added to a shell
using the
addCallback:receiver:selector:clientData:
method.
CwPrinterShell uses the following callbacks:
- mapCallback
- The shell has been mapped and is ready for print job production.
- exposeCallback
- The shell is ready to receive data for the current printer page.
- resizeCallback
- The shell's dimensions have been modified.
- destroyCallback
- The shell is about to be destroyed.
The following diagram shows the proper sequencing of printer shell job
commands and callbacks.

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