Constructs a drawing object reactor object
(vlr-object-reactor owners data callbacks)
The reactor object is added to the drawing database, but does not become persistent.
Arguments
An AutoLISP list of VLA-objects identifying the drawing objects to be watched.
Any AutoLISP data to be associated with the reactor object; otherwise nil if no data.
A list of pairs of the following form:
(event-name . callback_function)
where event-name is one of the symbols listed in the “Object Events” table and callback_function is a symbol representing a function to be called when the event fires. Each callback function accepts three arguments:
owner The owner of the VLA-object the event applies to.
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 “Object Events Callback Data” table.
Return Values
The reactor_object argument.
|
Object events |
|
|---|---|
|
Name |
Event |
|
:vlr-cancelled |
The modification of the object has been canceled. |
|
:vlr-copied |
The object has been copied. |
|
:vlr-erased |
Erase-flag of the object has been set. |
|
:vlr-unerased |
Erase-flag of the object has been reset. |
|
:vlr-goodbye |
The object is about to be deleted from memory. |
|
:vlr-openedForModify |
The object is about to be modified. |
|
:vlr-modified |
The object has been modified. If the modification was canceled, also :vlr-cancelled and :vlr-modifyUndone will be fired. |
|
:vlr-subObjModified |
A sub-entity of the object has been modified. This event is triggered for modifications to vertices of polylines or meshes, and for attributes owned by blockReferences. |
|
:vlr-modifyUndone |
The object's modification was undone. |
|
:vlr-modifiedXData |
The object's extended entity data has been modified. |
|
:vlr-unappended |
The object has been detached from the drawing database. |
|
:vlr-reappended |
The object has been re-attached to the drawing database. |
|
:vlr-objectClosed |
The object's modification has been finished. |
|
Object events callback data |
||
|---|---|---|
|
Name |
List length |
Parameters |
|
:vlr-cancelled :vlr-erased, :vlr-unerased :vlr-goodbye :vlr-openedForModify :vlr-modified :vlr-modifyUndone :vlr-modifiedXData :vlr-unappended :vlr-reappended :vlr-objectClosed |
0 |
|
|
:vlr-copied |
1 |
The object created by the copy operation (ename). |
|
:vlr-subObjModified |
1 |
The sub-object (ename) that has been modified |
Examples
The following code attaches an object reactor to the myCircle object. It defines the reactor to respond whenever the object is modified (:vlr-modified) and to call the print-radius function in response to the modification event:
(setq circleReactor (vlr-object-reactor (list myCircle)
"Circle Reactor" '((:vlr-modified . print-radius))))
