Hello,
I created such a class, and am attaching it for anybody who would lie to use it. It
is a bit of a hack, but it works. Any modifications or suggestions will be most
welcome!
-Armen
> Hi,
>
> I am wondering is that possible to create Mutiple line tooltips. By
> default, the swing is only able to display single line tooltips.
>
> Any idea is much appreciated.
>
> Zhichao
--
Armen Yampolsky
Axiom Software Labs
New York
import java.awt.*;
import java.util.*;
import java.io.*;
import javax.swing.*;
/**
* A custom tooltip class;
* Here we determine the dimensions of the tooltip based on the quantity and
* size of text to be displayed. We overide paint() and setPreferredSize() in
* order to implement the tooltip as multiline within the new dimensions, and
* add a few other minor visual tweaks.
*
* @author Armen Yampolsky
* Copyright(c) Axiom Software Labs
*/
public class CoolTip extends JToolTip
{
/** default values for tooltip maxwidth, and hpad/vpad for the text */
public static final int MAX_WIDTH_DEFAULT = 200;
public static final int HPAD_DEFAULT = 3;
public static final int VPAD_DEFAULT = 3;
/** instance values for tooltip maxwidth, and hpad/vpad for the text */
private int _maxwidth = MAX_WIDTH_DEFAULT;
private int _hpad = HPAD_DEFAULT;
private int _vpad = VPAD_DEFAULT;
/** the tooltip text, broken down by lines */
private Vector _textvector = new Vector();
public CoolTip()
{
super();
}
/** set the tooltip window width */
public void setMaxWidth(int maxwidth)
{
_maxwidth = maxwidth;
}
/** set the tooltip text hpadding */
public void setHpad(int hpad)
{
_hpad = hpad;
}
/** set the tooltip text vpadding */
public void setVpad(int vpad)
{
_vpad = vpad;
}
/** overrides JComponent's paint, in order to draw mulitple lines */
public void paint(Graphics g)
{
Font font = this.getFont();
FontMetrics metrics = Toolkit.getDefaultToolkit().getFontMetrics(font);
Dimension size = this.getSize();
int line_number = 1;
g.setColor(this.getBackground());
g.fillRect(0, 0, size.width, size.height);
g.setColor(Color.gray);
g.drawRect(0, 0, size.width-1, size.height-1);
g.setColor(this.getForeground());
g.setFont(font);
for (Enumeration e = _textvector.elements(); e.hasMoreElements();
line_number++)
{
g.drawString((String)e.nextElement(), _hpad, (_vpad +
metrics.getAscent())*line_number);
}
}
/**
* override super's getPreferredSize in order to determine width/height
such that
* each line fits within a specified tooltip window width.
*/
public Dimension getPreferredSize()
{
Font font = this.getFont();
FontMetrics metrics = Toolkit.getDefaultToolkit().getFontMetrics(font);
String tip_text = this.getTipText();
String current_line;
String current_token = "";
String spacer;
StringTokenizer st;
boolean eol;
int max_width = _maxwidth - (_hpad * 2);
int width, height;
// fix for bug 4094153 (Solaris pre-swing1.1 only)
if (tip_text == null)
{
return new Dimension(6,metrics.getHeight() + 4);
}
else
{
if (metrics.stringWidth(tip_text) > max_width) //multi-line
tooltip
{
st = new StringTokenizer(tip_text);
while (st.hasMoreTokens())
{
eol = false;
current_line = current_token; //make unused
token from last loop first part of current line
while ( (!eol) && (st.hasMoreTokens()) )
{
current_token = st.nextToken();
if (metrics.stringWidth(current_line +
" " + current_token) < max_width )
{
spacer =
(current_line.length() > 0) ? " " : "";
current_line = current_line +
spacer + current_token;
current_token = "";
}
else
{
eol = true;
}
}
_textvector.addElement(current_line);
}
if (current_token.length() > 0)
_textvector.addElement(current_token);
width = _maxwidth;
height = (_textvector.size())*(metrics.getAscent() +
_vpad) + _vpad*2;
}
else //single-line tooltip
{
_textvector.addElement(tip_text);
width = metrics.stringWidth(tip_text) + (_hpad * 2);
height = metrics.getHeight() + (_vpad * 2);
}
return new Dimension(width, height);
}
}
}
