volatile bool enabled = true;
transient JPanel buttons;
transient SingleComponentPanel scpStretcherControl;

JComponent visualizeWithoutEnabled() { ret super.visualize(); }
  
JComponent dm_visualizeWithEnabled(JComponent main) {
  ret centerAndSouthWithMargins(main, wrapControlArea());
}

JComponent wrapControlArea() {
  ret makeControlArea();
}

JPanel makeControlArea() {
  if (scpStretcherControl == null)
    scpStretcherControl = singleComponentPanel();
  var cb = makeEnabledCheckBox();
  buttons = jrightalignedline(cb);
  ret centerAndEastWithMargin(scpStretcherControl, buttons);
}

static JCheckBox makeEnabledCheckBox() {
  ret dm_fieldCheckBox('enabled);
}
  
void setEnabled(bool b) { setField(enabled := b); }

void addToControlArea aka addControls(Component... components) {
  addComponentsFirst(buttons, components);
}

void addButton aka addControl(Component component) {
  addComponentsFirst(buttons, component);
}

void addControl(Swingable component) {
  addComponentsFirst(buttons, wrap(component));
}

void setMainControl(JComponent control) {
  scpSet(scpStretcherControl, control);
}