PROPERTY [ READ ] Identifier AS Datatype
This declares a class property.
If the keyword READ
is specified, then the property will be read-only.
Once declared, a property must be implemented : you must write a function to read the property, and, if not read-only, a function to write the property.
The name of the read function is the name of the property followed by an underscore and the text "Read". This function takes no argument and must return a data whose type is the same as the property datatype.
The name of the write function is the name of the property followed by an underscore and the text "Write". This function is a procedure that returns nothing, and that takes only one argument whose type is the same as the property datatype.
Example :
PROPERTY Enabled AS Boolean PROPERTY READ Handle AS Integer ... PRIVATE $bEnabled AS Boolean PRIVATE $iHandle AS Integer ' Implements the Enabled property FUNCTION Enabled_Read() AS Boolean RETURN $bEnabled END SUB Enabled_Write(bEnabled AS Boolean) $bEnabled = bEnabled UpdateEverything END ' Implements the Handle property FUNCTION Handle_Read() AS Integer RETURN $iHandle END