Heavyweight Component.print() doesn't print anything

Name: agR10216 Date: 02/22/2003


I want to print some heavyweight Component that isn't a
Container on a Graphics. I expect Component.print() to do
this job as well as Component.printAll(). But a heavyweight
Component's print() doesn't print anything. This is rather
odd.

The following test case demonstrates the problem.

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import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;

public class PrintTest extends Frame {
    private Label label = new Label("click me!");
    private ImageCanvas canvas1 = new ImageCanvas();
    private ImageCanvas canvas2 = new ImageCanvas();

    public PrintTest() {
        setLayout(new GridLayout(0, 1));
        add(label);
        add(canvas1);
        add(canvas2);
        label.addMouseListener(new MouseAdapter() {
            public void mouseClicked(MouseEvent event) {
                BufferedImage image1 = new BufferedImage(
                        label.getWidth(), label.getHeight(),
                        BufferedImage.TYPE_INT_ARGB);
                Graphics g1 = image1.createGraphics();
                label.printAll(g1);
                canvas1.setImage(image1);

                BufferedImage image2 = new BufferedImage(
                        label.getWidth(), label.getHeight(),
                        BufferedImage.TYPE_INT_ARGB);
                Graphics g2 = image2.createGraphics();
                label.print(g2);
                canvas2.setImage(image2);
            }
        });
        setSize(200, 200);
        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                dispose();
            }
        });
        setVisible(true);
    }

    public static void main(String[] args) {
        new PrintTest();
    }
}

class ImageCanvas extends Canvas {
    private Image image;
    public void paint(Graphics g) {
        if (image != null) {
            g.drawImage(image, 0, 0, this);
        } else {
            g.drawString("no image", 30, 30);
        }
    }
    public void setImage(Image im) {
        image = im;
        repaint();
    }
}
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###@###.### 2002-02-22
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