Window Expose ⎕WX

⎕WX is a system variable with the value 0, 1 ,2 or 3. Considered as a sum of bit flags, the first bit in ⎕WX specifies (a); the second (b) as follows:

  1. whether or not the names of properties, methods and events provided by a Dyalog APL GUI object are exposed
  2. certain aspects of behaviour of .NET and COM objects

If ⎕WX is 1 (1st bit is set), the names of properties, methods and events are exposed as reserved names in GUI namespaces and can be accessed directly by name. This means that the same names may not be used for global variables in GUI namespaces.

If ⎕WX is 0, these names are hidden and may only be accessed indirectly using ⎕WG and ⎕WS.

If ⎕WX is 3 (2nd bit is also set) COM and .NET objects adopt the behaviour introduced in Version 11, as opposed to the behaviour in previous versions of Dyalog APL.

Note that it is the value of ⎕WX in the object itself, rather than the value of ⎕WX in the calling environment, that determines its behaviour.

When you create an object, its ⎕WX (like any other system variable) is initially inherited from its parent.

If the value of ⎕WX of a GUI object is initially 0, it will not expose its members. If you subsequently change it from 0 to 1, it will expose them. If you change its ⎕WX back to 0, it will not expose any yet-unexposed members, although already-exposed members will continue to be exposed.

The value of ⎕WX in a clear workspace is defined by the default_wx parameter (see default_wx) which itself defaults to 3.

⎕WX has namespace scope and may be localised in a function header. This allows you to create a utility namespace or utility function in which the exposure of objects is known and determined, regardless of its global value in the workspace.