sclass JControlsAndContent is Swingable {
  settable IF0</*JComponent or Swingable*/> makeContent;
  SingleComponentPanel scpContent = singleComponentPanel();
  ReliableSingleThread rstReloadContent = rst(l0 reloadImpl);
  settable JButton btnReload;
  SingleComponentPanel scpControls = singleComponentPanel();
  gettable JPanel controls = rightAlignedLine();
  SingleComponentPanel scpBigControl = scp();
  
  settable bool loadingScreenWhenReloading;
  settable bool showControls = true;
  
  void reload { rstReloadContent.trigger(); }
  
  cachedVisualize {
    onComponentShown(scpContent, -> { if (scpContent.isEmpty()) reload(); }, null);
    
    if (!showControls) ret scpContent;
    
    makeControls();
    ret northAndCenter(
      centerAndEastWithMargins(
        centerAndEastWithMargin(scpControlsMain, controls),
        btnReload), scpContent);
  }
  
  void makeControls {
    if (!showControls) ret;
    btnReload = jReloadButton(l0 reload);
    controls.add(btnReload);
  }
  
  swappable JComponent makeLoadingScreen() {
    ret jCenteredLabel("Loading...");
  }
    
  void reloadImpl {
    temp tempDisableButton(btnReload);
    
    if (loadingScreenWhenReloading() || !scpContent.hasComponent())
      scpContent.set(makeLoadingScreen());
      
    try {
      scpContent.set(makeComponent?!);
    } catch print e {
      scpContent.set(jErrorView(e));
    }
  }
}