module Sketchup class ModelObserver def onActivePathChanged end def onAfterComponentSaveAs end def onBeforeComponentSaveAs end def onDeleteModel end def onEraseAll end def onExplode end def onPlaceComponent end def onSaveModel end def onTransactionAbort end def onTransactionCommit end def onTransactionEmpty end def onTransactionRedo end def onTransactionStart end def onTransactionUndo end end end