Listening to JSplitPane divider location changes by user only?

Question

I am trying to implement a JSplitPane that saves its state to some configuration file, so i added a listener like this one :

mHorSplitPane.addPropertyChangeListener(new PropertyChangeListener() {
            public void propertyChange(PropertyChangeEvent changeEvent) {
                JSplitPane sourceSplitPane = (JSplitPane) changeEvent.getSource();
                String propertyName = changeEvent.getPropertyName();
                if (propertyName.equals(JSplitPane.DIVIDER_LOCATION_PROPERTY)) {
                    mController.writeSplitPaneProperty((int) (sourceSplitPane.getDividerLocation()/(float)sourceSplitPane.getBounds().width*100));

                }
            }
        });

which handles it just fine, but for some reason sometimes Swing code itself changes this property and changes the divider location, any suggestion on how can i overcome this?