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Purpose |
To provide a call-back function when a window is initially displayed. |
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Syntax |
winio@('%sc', cb_func) |
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Description |
Causes a given call-back to be called once only when a window is initially displayed (for example, for drawing initial %gr (Graphics Region) data). |
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Notes |
If %gr (Graphics Region) (say) has a call-back function that receives the RESIZE message from CLEARWIN_INFO@('CALLBACK_REASON'), this message is received before the %sc call-back is called. Call-back functions can often be shared by different format codes within one format window. For example, a call-back associated with %sc may also be suitable for %mv (OnMove Callback). |