//please include function withMargin.

static int showForm_defaultGap = 4;
static int showForm_gapBetweenColumns = 10;

static JPanel showFormTitled(fS title, fO... _parts) {
  ret swing(func -> JPanel {
    final new Var<JFrame> frame;
    JPanel panel = showForm_makePanel(frame, _parts);
    frame.set(handleEscapeKey(minFrameWidth(showPackedFrame(title, withMargin(panel)), 400)));
    ret panel;
  });
}

static JPanel showForm_makePanel(final Var<JFrame> frame, O... _parts) {
  Pair<LL<JComponent>, Runnable> p = showForm_makeComponents(frame, _parts);
  LL<JComponent> l = p.a;
  Runnable submit = p.b;

  int minW = 0;
  for (L<JComponent> row : l) {
    JComponent left = first(row);
    if (left instanceof JLabel) makeBold((JLabel) left).setVerticalAlignment(JLabel.TOP);
    minW = max(minW, getMinimumSize(left).width);
  }
  new L<JComponent> out;
  for (L<JComponent> row : l) {
    JComponent left = first(row);
    out.add(westAndCenter(withRightMargin(showForm_gapBetweenColumns, jMinWidth(minW, left)), second(row)));
  }
  JPanel panel = vstackWithSpacing(out, showForm_defaultGap);
  
  onEnterInAllTextFields(panel, submit);
  ret panel;
}