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Previous: <a href="DoUndo.html#DoUndo" accesskey="p" rel="prev">DoUndo</a>, Up: <a href="Undo-Commands.html#Undo-Commands" accesskey="u" rel="up">Undo Commands</a> [<a href="Command-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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<h4 class="subsection">4.7.5 AtomicUndo</h4>
<a name="index-AtomicUndo"></a>
<p>Syntax: <code>AtomicUndo [0|+|-]</code><br>
Abbreviation: <code>AU</code>
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<p>increases, decreases, sets or clears the <code>AtomicUndo</code> level.
The normal level is zero. All current document changes made while the
<code>AtomicUndo</code> level is above zero are treated as a single change by the
<code>Undo</code> and <code>Redo</code> commands. If no parameter is given, a level of 0
is set to 1; otherwise the current non-zero level is decremented. If 0 is
given, the level is reset to zero. Parameters of ‘<samp>+</samp>’ and ‘<samp>-</samp>’ respectively
increment and decrement the level, which in no case can be negative. If the
level is above zero, the <code>DoUndo</code> flag in the status bar, which is
normally a lower-case ‘<samp>u</samp>’, becomes upper case ‘<samp>U</samp>’.
</p>
<p>Two other actions will reset the <code>AtomicUndo</code> level to zero: invoking the
<code>Undo</code> command, and disabling the undo system with the <code>DoUndo</code>
command. You cannot set a non-zero <code>AtomicUndo</code> level unless the undo
system is enabled.
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<p>Note: macros that you wish to undo and redo atomically—i.e., as if they
were single commands—should begin with <code>AtomicUndo +</code> and end with
<code>AtomicUndo -</code> so that they can call and/or be called by other macros.
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