* @param nullable a boolean.
*/
public TagListModel( @NotNull TagObservable availableTags, boolean nullable ) {
this.availableTags = availableTags;
this.nullable = nullable;
availableTags.addTagChangeListener( new TagChangeListener() {
@Override
public void tagChanged( @NotNull TagChangeEvent event ) {
notifyTagChanged( event );
}
} );