Inside Macintosh: QuickTime Components /

Chapter 11 - Clock Components / Clock Components Reference

Clock Component Functions / Managing the Time

ClockTimeChanged

The Movie Toolbox calls your component's ClockTimeChanged function whenever the callback's time base time value is set. The Movie Toolbox calls this function only if the qtcbNeedsTimeChanges flag is set to 1 in the callBackFlags field of the QuickTime callback header structure allocated by your clock component (see "Data Type" beginning on page 11-5 for more information).

pascal ComponentResult ClockTimeChanged 
                                    (ComponentInstance aClock,
                                     QTCallBack cb);

aClock

Specifies the clock for the operation. Applications obtain this identifier from the Component Manager's OpenComponent function.

cb

Specifies the callback for the operation. The Movie Toolbox obtains this value from your component's ClockNewCallBack function.

DESCRIPTION

The Movie Toolbox calls this function once for each qualified callback function associated with the time base. Note that the Movie Toolbox calls this function only for callback events that are currently scheduled.