Constructs an editor reactor object that notifies of a change to a system variable
Supported Platforms: Windows only; not available on Mac OS or Web
Signature
(vlr-sysvar-reactor data callbacks)
- data
-
Type: Integer, Real, String, List, VLA-object, Safearray, Variant, T, or nil
Any AutoLISP data to be associated with the reactor object; otherwise nil if no data.
- callbacks
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Type: List
A list of pairs of the following form:
(event-name . callback_function)
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event-name is one of the following SysVar reactor events:
SysVar reactor events
Event name
Description
:vlr-sysVarWillChange
AutoCAD is about to change the value of a system variable.
:vlr-sysVarChanged
The value of a system variable has changed.
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callback_function is a symbol representing a function to be called when the event fires. Each callback function accepts two arguments:
reactor_object -- The VLR object that called the callback function.
list -- A list of extra data elements associated with the particular event. The contents of this list for particular events are shown in the “SysVar reactor callback data” table.
SysVar reactor callback data
Name
List length
Parameters
:vlr-sysVarWillChange
1
A string identifying the system variable name.
:vlr-sysVarChanged
2
First parameter is a string identifying the system variable name.
Second parameter is symbol indicating whether the change was successful (T if successful, nil if not).
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Return Values
Type: VLR object
The reactor_object argument from the callback_function.
Examples
N/A