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4.4.4 Frame phase events

To handle events during different points of frame processing, handlers of ‘csevFrame’ can use simple helper macros to classify themselves as belonging to any of six “phases” of frame creation.

These macros, included in the declaration of an event handler class, provide all of the naming and constraint methods to make instances of that handler class schedule their subscriptions to ‘csevFrame’ within the appropriate phase. (You will not be able to use these macros if you need to subscribe the handler to events besides ‘csevFrame’ and apply ordering constraints for those events.)

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