在paintComponent中绘制另一个组件

Question

I use SwingPaintDemo2 from Java Tutorials:

http://download.oracle.com/javase/tutorial/uiswing/examples/painting/SwingPaintDemo2Project/src/painting/SwingPaintDemo2.java

I modified it like this:

public void paintComponent(Graphics g) {
    super.paintComponent(g);

    // Draw Text
    g.drawString("This is my custom Panel!",10,20);

    JLabel c = new JLabel("Label");
    c.paint(g);
}

g.drawString works fine. But how can I paint JLabel from this method? It doesn't work.

Answer 1

I think you have to set a size to your label.

public void paintComponent(Graphics g) {
    super.paintComponent(g);

    // Draw Text
    g.drawString("This is my custom Panel!",10,20);

    JLabel c = new JLabel("Label");
    c.setBounds(0, 0, 400, 30);
    c.paint(g);
}

Answer 2

See the LabelRenderTest.java source on this thread . The label is eventually drawn to screen, but it is painted to BufferedImage before ever being displayed.

The important line of the source is..

textLabel.setSize(textLabel.getPreferredSize());

Answer 3

JLabel label_name = new JLabel("Some text");

label_name.setBounds(position_x, position_y, width, height);

label_name.setFont(new Font("Dialog", Font.PLAIN, 10));

add(label_name);