sclass JContentAndControls is Swingable, Updateable {

  settable IF0/*<JComponent or Swingable>*/ makeContent;

  SingleComponentPanel scpContent = singleComponentPanel();

  ReliableSingleThread rstReloadContent = rst(l0 reloadImpl);

  settable JButton btnReload;

  gettable DynamicHStack controls = dynamicHStack();

  gettable JPanel rightCornerControls = jline();

  SingleComponentPanel scpControls = singleComponentPanel(jfullcenter(controls));

  settable bool loadingScreenWhenReloading;

  settable bool showControls = true;

  settable bool showReloadButton = true;

  public void reload aka update() { rstReloadContent.trigger(); }

  cachedVisualize {

    onComponentShown(scpContent, -> { if (scpContent.isEmpty()) reload(); });

    if (!showControls) ret scpContent;

    if (showReloadButton) {

      btnReload = jReloadButton(l0 reload);

      add(rightCornerControls, btnReload);

    }

    ret northAndCenter(withMargin(

      centerAndEastWithMargin(scpControls, rightCornerControls)), scpContent);

  }

  swappable JComponent makeLoadingScreen() {

    ret jCenteredLabel("Loading...");

  }

  void reloadImpl {

    temp tempDisableButton(btnReload);

    if (loadingScreenWhenReloading() || !scpContent.hasComponent())

      scpContent.set(makeLoadingScreen());

    try {

      scpContent.set(wrap(makeContent?!));

    } catch print e {

      scpContent.set(jErrorView(e));

    }

  }

  selfType addControl(S label, JComponent etc control) {

    ret addControl(withLabel(label, control));

  }

  selfType addControl(JComponent etc control) {

    controls.addComponent(control);

    this;

  }

  selfType content(IF0 makeContent) {

    ret makeContent(makeContent);

  }

  selfType addControlLine(JComponent newControls) {

    scpControls.set(centerAndSouthWithMargin(scpControls!, newControls);

    this;

  }

}