Is there a way to make a JLabel's text stretch to 100% height? I need the text to update when the component's size changes as well.
I saw some solution that could work; It involved calculating and setting the font size so it appears the right height. I would have also have to add listeners for when the height changed to make it respond and I do not know exactly where I should do that.
I am hoping for a better solution with layout managers, but couldn't find anything.
Any ideas?
In the approach shown below, the desired text is imaged using TextLayout
using a suitably large Font
size and scaled to fill the component. There's a related example here.
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.font.FontRenderContext;
import java.awt.font.TextLayout;
import java.awt.image.BufferedImage;
import javax.swing.JFrame;
import javax.swing.JLabel;
/** @see https://stackoverflow.com/questions/8281886 */
public class LayoutTest extends JLabel {
private static final int SIZE = 256;
private BufferedImage image;
private LayoutTest(String string) {
super(string);
image = createImage(super.getText());
}
@Override
public void setText(String text) {
super.setText(text);
image = createImage(super.getText());
repaint();
}
@Override
public Dimension getPreferredSize() {
return new Dimension(image.getWidth() / 2, image.getHeight() / 2);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(image, 0, 0, getWidth(), getHeight(), null);
}
private BufferedImage createImage(String label) {
Font font = new Font(Font.SERIF, Font.PLAIN, SIZE);
FontRenderContext frc = new FontRenderContext(null, true, true);
TextLayout layout = new TextLayout(label, font, frc);
Rectangle r = layout.getPixelBounds(null, 0, 0);
System.out.println(r);
BufferedImage bi = new BufferedImage(
r.width + 1, r.height + 1, BufferedImage.TYPE_INT_RGB);
Graphics2D g2d = (Graphics2D) bi.getGraphics();
g2d.setRenderingHint(
RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setColor(getBackground());
g2d.fillRect(0, 0, bi.getWidth(), bi.getHeight());
g2d.setColor(getForeground());
layout.draw(g2d, 0, -r.y);
g2d.dispose();
return bi;
}
private static void display() {
JFrame f = new JFrame("LayoutTest");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(new LayoutTest("Sample"));
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
display();
}
});
}
}
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