Roberto Falk :
How to draw something over all components of a Panel?
In the code below I tried to do this overriding the paintComponent method, I call super.paintComponent(g) hoping this will draw all components added as part of the constructor, but still my X stays below the image.
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class Stack extends JPanel {
private final JLabel some_text = new JLabel("Some very long text that will be covered", JLabel.LEFT);
private final JLabel some_icon = new JLabel((Icon)null, JLabel.CENTER);
public static final String COMPASS_URL = "https://upload.wikimedia.org/wikipedia/commons/thumb/f/f8/Compass_Rose_English_North.svg/240px-Compass_Rose_English_North.svg.png";
public Stack() throws IOException {
super(new GridBagLayout());
URL compassUrl = new URL(COMPASS_URL);
BufferedImage compassImage = ImageIO.read(compassUrl);
ImageIcon compassIcon = new ImageIcon(compassImage);
some_icon.setIcon(compassIcon);
GridBagConstraints c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 0;
add(some_icon, c);
c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 1;
add(some_text, c);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g.create();
g2.setColor(Color.RED);
g2.setStroke(new BasicStroke(15));
g2.drawLine(0, 0, this.getWidth(), this.getHeight());
g2.drawLine(this.getWidth(), 0, 0, this.getHeight());
g2.dispose();
}
private static void createAndShowUI() throws IOException {
JFrame frame = new JFrame("MyFrame");
frame.getContentPane().add(new Stack());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 400);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
try {
createAndShowUI();
} catch (IOException e) {
e.printStackTrace();
}
}
});
}
}
Is there a way to bring my X to the foreground or to wait for super.paintComponent(g) to paint everything, and then run the code that draws the X?
Thanks, Roberto
camickr :
Override the paint(…) method of your JPanel:
protected void paint(Graphics g)
{
super.paint(g);
// add custom painting code here
}
The paint(…) method invokes the paintChildren(…) method so your custom code will be executed after all the components on the panel are painted.
See A Closer Look at the Painting Mechanism for more information.
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