!7

cm CurrentAction {
  transient JPanel stack;
  transient new RestartableCountdown deleteIfUnused;
  
  start {
    startCountdown();
    if (dm_getBounds() == null) {
      int w = getWidth(dm_desktopPane()), h = getHeight(dm_desktopPane());
      dm_setBounds(this, w-300, h-200, 300, 200);
    }
  }
  
  visualize {
    ret withRightMargin(stack = dynamicVStack2());
  }
  
  // start countdown to delete module if unused
  void startCountdown {
    deleteIfUnused.start(60.0, rEnter deleteIfUnused);
  }
  
  // API
  
  interface AnAction extends AutoCloseable {
    void setText(S text);
  }
  
  // Note: cancelMe will be called in GUI thread
  AutoCloseable showAction(S action, Runnable cancelMe) {
    deleteIfUnused.stop();
    final JLabel lbl = jlabel(action);
    final JComponent c = centerAndEast(lbl, jbutton("Cancel", cancelMe));
    addAndValidate(stack, c);
    ret new AnAction {
      public void close() enter {
        removeAndValidate(c);
        //print("Remaining components: " + componentCount(stack));
        if (emptyContainer(stack)) dm_hideModule();
        startCountdown();
      }
      public void setText(S text) { main.setText(lbl, text); }
    };
  }
  
  void deleteIfUnused {
    // TODO: minimal race condition
    if (countComponents(stack) == 0) dm_deleteModule();
  }
}