<divclass=CToolTipid="tt2201"><divclass=CFunction><blockquote><tableborder=0cellspacing=0cellpadding=0class="Prototype"><tr><tdclass="prettyprint">mxEditor.prototype.undo = () =></td></tr></table></blockquote>Undo the last change in graph.</div></div><divclass=CToolTipid="tt2202"><divclass=CFunction><blockquote><tableborder=0cellspacing=0cellpadding=0class="Prototype"><tr><tdclass="prettyprint">mxUndoableEdit.prototype.undo = function()</td></tr></table></blockquote>Undoes all changes in this edit.</div></div><divclass=CToolTipid="tt2203"><divclass=CFunction><blockquote><tableborder=0cellspacing=0cellpadding=0class="Prototype"><tr><tdclass="prettyprint">mxUndoManager.prototype.undo = function()</td></tr></table></blockquote>Undoes the last change.</div></div><divclass=CToolTipid="tt2204"><divclass=CFunction><blockquote><tableborder=0cellspacing=0cellpadding=0class="Prototype"><tr><td><tableborder=0cellspacing=0cellpadding=0><tr><tdclass="PBeforeParameters prettyprint "nowrap>mxUndoManager.prototype.undoableEditHappened = function(</td><tdclass="PParameter prettyprint "nowrap>undoableEdit</td><tdclass="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Method to be called to add new undoable edits to the history.</div></div><divclass=CToolTipid="tt2205"><divclass=CFunction><blockquote><tableborder=0cellspacing=0cellpadding=0class="Prototype"><tr><td><tableborder=0cellspacing=0cellpadding=0><tr><tdclass="PBeforeParameters prettyprint "nowrap>mxGraph.prototype.ungroupCells = function(</td><tdclass="PParameter prettyprint "nowrap>cells</td><tdclass="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Ungroups the given cells by moving the children the children to their parents parent and removing the empty groups. </div></div><divclass=CToolTipid="tt2206"><divclass=CFunction><blockquote><tableborder=0cellspacing=0cellpadding=0class="Prototype"><tr><td><tableborder=0cellspacing=0cellpadding=0><tr><tdclass="PBeforeParameters prettyprint "nowrap>mxVertexHandler.prototype.union = function(</td><tdclass="PParameter prettyprint "nowrap>bounds,</td></tr><tr><td></td><tdclass="PParameter prettyprint "nowrap>dx,</td></tr><tr><td></td><tdclass="PParameter prettyprint "nowrap>dy,</td></tr><tr><td></td><tdclass="PParameter prettyprint "nowrap>index,</td></tr><tr><td></td><tdclass="PParameter prettyprint "nowrap>gridEnabled,</td></tr><tr><td></td><tdclass="PParameter prettyprint "nowrap>scale,</td></tr><tr><td></td><tdclass="PParameter prettyprint "nowrap>tr,</td></tr><tr><td></td><tdclass="PParameter prettyprint "nowrap>constrained,</td></tr><tr><td></td><tdclass="PParameter prettyprint "nowrap>centered</td><tdclass="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Returns the union of the given bounds and location for the specified handle index.</div></div><divclass=CToolTipid="tt2207"><divclass=CFunction><blockquote><tableborder=0cellspacing=0cellpadding=0class="Prototype"><tr><tdclass="prettyprint">mxCellMarker.prototype.unmark = function()</td></tr></table></blockquote>Hides the marker and fires a mark event.</div></div><divclass=CToolTipid="tt2208"><divclass=CFunction><blockquote><tableborder=0cellspacing=0cellpadding=0class="Prototype"><tr><td><tableborder=0cellspacing=0cellpadding=0><tr><tdclass="PBeforeParameters prettyprint "nowrap>mxConstraintHandler.prototype.update = function(</td><tdclass="PParameter prettyprint "nowrap>me,</td></tr><tr><td></td><tdclass="PParameter prettyprint "nowrap>source,</td></tr><tr><td></td><tdclass="PParameter prettyprint "nowrap>existingEdge,</td></tr><tr><td></td><tdclass="PParameter prettyprint "nowrap>point</td><tdclass="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Updates the state of this handler based on the given mxMouseEvent. </div></div><divclass=CToolTipid="tt2209"><divclass=CFunction><blockquote><tableb