sclass JImageSwitch > JLabel {
  S onImageID, offImageID;
  S offToolTip, onToolTip;
  IVarWithNotify<Bool> var;
  bool on;
  InstantNeverHideToolTip toolTip;
  
  *(S *onImageID, S *offImageID, IVarWithNotify<Bool> *var) {
    toolTip = new InstantNeverHideToolTip(this);
    bindListenerToComponent(this, var, r { set(var!) });
    on = var!;
    updateIcon();
    onLeftClick(this, l0 flip);
  }
  
  selfType setToolTips(S onTooltip, S offToolTip) {
    this.onToolTip = onToolTip;
    this.offToolTip = offToolTip;
    updateIcon();
    this;
  }
  
  // overriding getToolTipText doesn't work for JLabel?!
  @Override
  public S getToolTipText() {
    S toolTip = or(on ? onToolTip : offToolTip, super.getToolTipText());
    ret _print(+toolTip);
  }

  void updateIcon {  
    /*if (onToolTip != null || offToolTip != null)
      setToolTipText(_print(setToolTipText := on ? onToolTip : offToolTip));*/
    toolTip.setText(on ? onToolTip : offToolTip);
    setIcon(imageIcon(loadImage2_cached(on ? onImageID : offImageID)));
  }
  
  void flip { set(!on); }
  
  void set(bool value) swing {
    if (on != value) {
      on = value;
      updateIcon();
      var.set(on);
    }
  }
  
  bool isOn() { ret on; }
}