|
// This example is from the book _Java AWT Reference_ by John Zukowski.
// Written by John Zukowski. Copyright (c) 1997 O'Reilly & Associates.
// You may study, use, modify, and distribute this example for any purpose.
// This example is provided WITHOUT WARRANTY either expressed or
import java.awt.Dimension;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Insets;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Center extends JPanel {
static String text[] = new String[]{"asdf","asdfasdf"};
private Dimension dim;
public void addNotify() {
super.addNotify();
int maxWidth = 0;
FontMetrics fm = getFontMetrics(getFont());
for (int i=0;i<text.length;i++) {
maxWidth = Math.max (maxWidth, fm.stringWidth(text[i]));
}
Insets inset = getInsets();
dim = new Dimension (maxWidth + inset.left + inset.right,
text.length*fm.getHeight() + inset.top + inset.bottom);
setSize (dim);
}
public void paint (Graphics g) {
g.translate(100, 100);
FontMetrics fm = g.getFontMetrics();
for (int i=0;i<text.length;i++) {
int x,y;
x = (getWidth() - fm.stringWidth(text[i]))/2;
y = (i+1)*fm.getHeight()-1;
g.drawString (text[i], x, y);
}
}
public static void main(String[] a){
JFrame f = new JFrame();
f.add(new Center());
f.setSize(300,300);
f.setVisible(true);
}
}
|
