vlr-undo-reactor

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vlr-types

V Functions

vlr-wblock-reactor

vlr-undo-reactor

Constructs an editor reactor object that notifies of an undo event

(vlr-undo-reactor data callbacks)

Arguments

data: Any AutoLISP data to be associated with the reactor object; otherwise nil if no data.
callbacks: A list of pairs of the following form:

(event-name . callback_function)

where event-name is one of the symbols listed in the “Undo reactor events” table below, and 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 “Undo reactor callback data” table.

Return Values

The reactor_object argument.

Undo reactor events
Event name	Description
:vlr-undoSubcommandAuto	The UNDO command's Auto option has been executed.
:vlr-undoSubcommandControl	The UNDO command's Control option has been executed.
:vlr-undoSubcommandBegin	The UNDO command's BEGIN or GROUP option is being performed. BEGIN and GROUP mark the beginning of a series of commands that can be undone as one unit.
:vlr-undoSubcommandEnd	The UNDO command's END option is being performed. UNDO/END marks the end of a series of commands that can be undone as one unit.
:vlr-undoSubcommandMark	The UNDO command's MARK option is about to be executed. This places a marker in the undo file so UNDO/BACK can undo back to the marker.
:vlr-undoSubcommandBack	The UNDO command's BACK option is about to be performed. UNDO/BACK undoes everything back to the most recent MARK marker or back to the beginning of the undo file if no MARK marker exists.
:vlr-undoSubcommandNumber	The UNDO command's NUMBER option is about to be executed (the default action of the UNDO command).

Undo reactor callback data
Name	List length	Parameters
:vlr-undoSubcommandAuto	2	First parameter is an integer indicating the activity. The value is always 4, indicating that notification occurred after the operation was performed. Second parameter is a symbol indicating the state of Auto mode. Value is T if Auto mode is turned on, nil if Auto mode is turned off.
:vlr-undoSubcommandControl	2	First parameter is an integer indicating the activity. The value is always 4, indicating that notification occurred after the operation was performed. Second parameter is an integer indicating the Control option selected. This can be one of the following: 0—NONE was selected 1—ONE was selected 2—ALL was selected
:vlr-undoSubcommandBegin :vlr-undoSubcommandEnd :vlr-undoSubcommandMark :vlr-undoSubcommandBack	1	An integer value of 0, indicating that notification occurs before the actual operation is performed.
:vlr-undoSubcommandNumber	2	First parameter is an integer indicating the activity. The value is always 0, indicating that notification occurs before the actual operation is performed. Second parameter is an integer indicating the number of steps being undone.

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