Swing/WindowShape のバックアップ(No.3)

JFrame frame = new JFrame();
frame.setUndecorated(true);
frame.setAlwaysOnTop(true);
frame.setDefaultCloseOperation(WindowConstants.HIDE_ON_CLOSE);
frame.getContentPane().add(label);
frame.getContentPane().setBackground(Color.GREEN);
frame.pack();

String str = textField.getText().trim();
//label.setText(str);
TextLayout tl = new TextLayout(str, font, frc);
Rectangle2D b = tl.getBounds();
Shape shape = tl.getOutline(AffineTransform.getTranslateInstance(-b.getX(),-b.getY()));

frame.setBounds(shape.getBounds());
//frame.setSize(shape.getBounds().width, shape.getBounds().height);
com.sun.awt.AWTUtilities.setWindowShape(frame, shape);
//frame.setShape(shape); // 1.7.0
frame.setLocationRelativeTo(parent);
frame.setVisible(true);