L_AutAddUndoNode

#include "ltaut.h"

L_LTAUT_API L_INT L_AutAddUndoNode(pAutomation, dwFlags);

pAUTOMATIONHANDLE pAutomation;	/* pointer to an automation handle */
L_UINT32 dwFlags;	/* reserved */

Manually adds an undo node to the automation object.

Parameter	Description
pAutomation	Pointer to an automation handle.
dwFlags	Reserved for future use. Use 0.

Returns

SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

This function adds an undo node to the automation object. When used with L_AutSetUndoEnabled, a lengthy operation, consisting of multiple steps, can be combined into one undo call to L_AutUndo. To accomplish this, use the following steps:

1.	Call L_AutAddUndoNode to add an undo node to the automation handle.
2.	Disable the undo feature by calling L_AutSetUndoEnabled (pAutomation, FALSE).
3.	Perform the operations to be combined into one undo, For example:

Vector Rotate

Vector Scale

Vector Translate

4.	Re-enable the undo feature by calling L_AutSetUndoEnabled (pAutomation, TRUE).

Now, all three operations can be undone with one call to L_AutUndo instead of three calls to L_AutUndo.

Required DLLs and Libraries

LTAUT

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application

See Also

Functions:	L_AutSetUndoEnabled, L_AutSetUndoLevel, L_AutUndo, L_AutRedo
Topics:	Undoing and Redoing Automation Operations

Example

 L_INT AutAddUndoNodeExample(pAUTOMATIONHANDLE pAutomation)
{
   L_INT nRet;
   /* Add an undo node manually */
   nRet = L_AutAddUndoNode( pAutomation, 0L );
   if(nRet != SUCCESS)
      return nRet;

   /* Disable the undo feature */
   nRet = L_AutSetUndoEnabled ( pAutomation, FALSE );
   if(nRet != SUCCESS)
      return nRet;

   /* Do multiple operations on the automation object */

   /* Re-enable the undo feature */
   nRet = L_AutSetUndoEnabled ( pAutomation, TRUE );
   if(nRet != SUCCESS)
      return nRet;
   return SUCCESS;
}