Querying Reactors Using Function Calls

Inspecting Reactors

Querying, Modifying, and Removing Reactors

Modifying Reactors

 

AutoLISP Developer's Guide > Using the Visual LISP Environment > Advanced Topics > Attaching Reactors to AutoCAD Drawings > Querying, Modifying, and Removing Reactors > 

Querying Reactors Using Function Calls

VLISP also provides functions to inspect a reactor definition from within an application program, or at the Console prompt:

• vlr-type returns the type of the specified reactor. For example:

  $ (vlr-type circleReactor)

  :VLR-Object-Reactor

• vlr-current-reaction-name returns the name of the event that caused the callback function to be called.
• vlr-data returns the application-specific data value attached to the reactor, as shown in the following example:

  $ (vlr-data circleReactor)

  "Circle Reactor"

  You can use this data to distinguish among multiple reactors that can fire the same callback function.

• vlr-owners returns a list of the objects in an AutoCAD drawing that fire notifications to an object reactor. The following function call lists the objects that fire notifications to circleReactor:

  _$ (vlr-owners circleReactor)

  (#<VLA-OBJECT IAcadCircle 03ad077c>)

• vlr-reactions returns the callback list of condition-function pairs of the specified reactor. The following example returns information about circleReactor:

  $ (vlr-reactions circleReactor)

  ((:vlr-modified . PRINT-RADIUS))