static int awtOnConceptChanges_defaultDelay = 500;

static new ThreadLocal<Concepts> awtOnConceptChanges_concepts;

static void awtOnConceptChanges(Component component, O runnable) {
  awtOnConceptChanges(componentToJComponent(component), runnable, true);
}

static void awtOnConceptChanges(JComponent component, final O runnable, bool runOnFirstTime) {
  awtOnConceptChanges(component, awtOnConceptChanges_defaultDelay, 0, runnable, runOnFirstTime);
}

static void awtOnConceptChanges(JComponent component, int delay, final O runnable) {
  awtOnConceptChanges(component, delay, delay, runnable);
}
  
static void awtOnConceptChanges(JComponent component, int delay, int firstDelay, O runnable) {
  awtOnConceptChanges(component, delay, firstDelay, runnable, true);
}

sbool awtOnConceptChanges_debug;

static void awtOnConceptChanges(JComponent component, int delay, int firstDelay, final O runnable, final bool runOnFirstTime) {
  final Concepts concepts = or(awtOnConceptChanges_concepts!, db_mainConcepts());
  installTimer(component, delay, firstDelay, new Runnable {
    long c = runOnFirstTime ? -1 : concepts.changes;
    bool skip;
    
    public void run() {
      long _c = concepts.changes;
      if (awtOnConceptChanges_debug)
        print("awtOnConceptChanges: " + _c + " / " + c);
      if (skip) skip = false;        
      else if (_c != c) {
        c = _c;
        call(runnable);
        skip = true;
      }
    }
  });
}