MultiLine ToolTip Example
// Example from http://www.crionics.com/products/opensource/faq/swing_ex/SwingExamples.html
/* (swing1.1beta3) */
import java.awt.Dimension;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Toolkit;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.StringReader;
import java.util.Enumeration;
import java.util.Vector;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JToolTip;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.plaf.metal.MetalToolTipUI;
/**
* @version 1.0 11/09/98
*/
public class MultiLineToolTipExample extends JFrame {
public MultiLineToolTipExample() {
super("Multi-Line ToolTip Example");
JButton button = new JButton("Hello, world") {
public JToolTip createToolTip() {
MultiLineToolTip tip = new MultiLineToolTip();
tip.setComponent(this);
return tip;
}
};
button.setToolTipText("Hello\nworld");
getContentPane().add(button);
}
public static void main(String args[]) {
try {
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
} catch (Exception evt) {}
MultiLineToolTipExample f = new MultiLineToolTipExample();
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
f.setSize(300, 100);
f.show();
}
}
class MultiLineToolTip extends JToolTip {
public MultiLineToolTip() {
setUI(new MultiLineToolTipUI());
}
}
class MultiLineToolTipUI extends MetalToolTipUI {
private String[] strs;
private int maxWidth = 0;
public void paint(Graphics g, JComponent c) {
FontMetrics metrics = Toolkit.getDefaultToolkit().getFontMetrics(
g.getFont());
Dimension size = c.getSize();
g.setColor(c.getBackground());
g.fillRect(0, 0, size.width, size.height);
g.setColor(c.getForeground());
if (strs != null) {
for (int i = 0; i < strs.length; i++) {
g.drawString(strs[i], 3, (metrics.getHeight()) * (i + 1));
}
}
}
public Dimension getPreferredSize(JComponent c) {
FontMetrics metrics = Toolkit.getDefaultToolkit().getFontMetrics(
c.getFont());
String tipText = ((JToolTip) c).getTipText();
if (tipText == null) {
tipText = "";
}
BufferedReader br = new BufferedReader(new StringReader(tipText));
String line;
int maxWidth = 0;
Vector v = new Vector();
try {
while ((line = br.readLine()) != null) {
int width = SwingUtilities.computeStringWidth(metrics, line);
maxWidth = (maxWidth < width) ? width : maxWidth;
v.addElement(line);
}
} catch (IOException ex) {
ex.printStackTrace();
}
int lines = v.size();
if (lines < 1) {
strs = null;
lines = 1;
} else {
strs = new String[lines];
int i = 0;
for (Enumeration e = v.elements(); e.hasMoreElements(); i++) {
strs[i] = (String) e.nextElement();
}
}
int height = metrics.getHeight() * lines;
this.maxWidth = maxWidth;
return new Dimension(maxWidth + 6, height + 4);
}
}
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