This system function resets property values for a GUI object.
X is a namespace reference or a character vector containing the name of the object. Y defines the property or properties to be changed and the new value or values. If a single property is to be changed, Y is a vector whose first element Y[1] is a character vector containing the property name. If Y is of length 2, Y[2] contains the corresponding property value. However, if the property value is itself a numeric or nested vector, its elements may be specified in Y[2 3 4 ...] instead of as a single nested element in Y[2]. If Y specifies more than one property, they may be declared either positionally or with a keyword followed by a value. Properties are specified positionally by placing their values in Y in the order prescribed for an object of that type. Note that the first property in Y must always be specified with a keyword because the Type property (which is expected first) may not be changed using ⎕WS.
If X refers to a non-existent GUI name, a VALUE ERROR is reported. If Y refers to a non-existent property, or to a property that is not defined for the type of object X, or to a property whose value may not be changed by ⎕WS, a DOMAIN ERROR is reported.
The shy result R contains the previous values of the properties specified in Y.
GUI objects are named relative to the current namespace. A null value of X (referring to the namespace in which the function is being evaluated) may be omitted. The following examples are equivalent:
'F1.B1' ⎕WS 'Caption' '&Ok'
'B1' F1.⎕WS 'Caption' '&Ok'
'' F1.B1.⎕WS 'Caption' '&Ok'
F1.B1.⎕WS 'Caption' '&Ok'
'F1' ⎕WC 'Form' ⍝ A default Form
'F1' ⎕WS 'Active' 0
'F1' ⎕WS 'Caption' 'My Application'
'F1' ⎕WS 'Posn' 0 0
'F1' ⎕WS ('Active' 1)('Event' 'Configure' 'FOO')
'F1' ⎕WS 'Junk' 10
DOMAIN ERROR
'F1' ⎕WS 'MaxButton' 0
DOMAIN ERROR