Method DataRef():validate() Foundation
Validates the data in the edit buffer.
:validate() --> lValidThis method returns the value .T. (true) when the data in the edit buffer is valid, otherwise it returns .F. (false).
The method :validate() validates the data currently in the edit buffer of an Xbase Part. A validation code block needs to be available in the instance variable :validate. self is passed to this code block. Within this code block, :editBuffer() must be used to read the edit buffer. The method :getData() cannot be used at this point, since it evaluates the code block in :dataLink (If :getData() is used, an assignment takes place during the validation).
If no validation code block exists, :validate() returns the value of the instance variable :lastValid.
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