Multi-line Tooltip inside a JTable's Cell

stevenc49 · #1 (**permalink**) 06-29-2008, 06:00 AM

Hi, I have a JTable and I got it to display tooltips depending on which cell the mouse hovers over. However, my tooltips are all one line and I would like to make it multi-lined (like a JTextArea). Some of the sites that I have found said that tooltips can display simple html but inserting <br> or even \n into my strings doesn't work for my program.

Could someone please take a look at my code and see what I can do? Thanks.

i

Code:

import java.awt.Font;
import java.awt.event.MouseEvent;
 
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
 
public class MultiLineToolTipInsideJTableCell extends JFrame {
 
	public static void main(String[] args) {
		
		new MultiLineToolTipInsideJTableCell();
	}
 
	public MultiLineToolTipInsideJTableCell()
	{
		//initilize
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		JPanel panel = new JPanel();
		
		//JTable
		JTable commentTable = new JTable() {
			
            //Implement table cell tool tips.			
            public String getToolTipText(MouseEvent e) {
            	String tip = null;
                java.awt.Point p = e.getPoint();
                int rowIndex = rowAtPoint(p);
                int colIndex = columnAtPoint(p);
                int realColumnIndex = convertColumnIndexToModel(colIndex);
			
                try {
					if (realColumnIndex == 2 && rowIndex!=0) { //comment row, exclude heading
						tip = getValueAt(rowIndex, colIndex).toString();
					}
				} catch (RuntimeException e1) {
					//catch null pointer exception if mouse is over an empty line
				}
                
                return tip;
            }
		};
		
		commentTable.setFont(new Font("Dialog", 0, 11));
		commentTable.setAutoscrolls(true);
		commentTable.setOpaque(true);
		commentTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
		
		commentTable.setModel(new DefaultTableModel(new Object[][] {},
				new String[] { "USER", "TIME", "COMMENT" }) {
			@SuppressWarnings("unchecked")
			Class[] types = new Class[] { java.lang.String.class,
					java.lang.String.class, java.lang.String.class};
 
			boolean[] canEdit = new boolean[] { false, false, false};
 
			@SuppressWarnings("unchecked")
			public Class getColumnClass(int columnIndex) {
				return types[columnIndex];
			}
 
			public boolean isCellEditable(int rowIndex, int columnIndex) {
				return canEdit[columnIndex];
			}
		});
		
		((DefaultTableModel) commentTable.getModel()).setRowCount(5);
		
		commentTable.getModel().setValueAt("USERNAME", 0, 0);
		commentTable.getModel().setValueAt("DATE", 0, 1);
		commentTable.getModel().setValueAt("COMMENTS", 0, 2);
				
		//generate table's content here
		for (int i=1; i<=3; i++)
		{
			commentTable.getModel().setValueAt("User"+i, i, 0);
			commentTable.getModel().setValueAt("Date"+i, i, 1);
			//commentTable.getModel().setValueAt("short comment"+i, i, 2);
			commentTable.getModel().setValueAt("A very loooooooooooooooooooooooooooooooooong comment. Would like to split it up into multiple lines."+i, i, 2);
		}
		
		//finalize
		panel.add(commentTable);
		this.add(panel);
		this.setSize(400, 300);
		this.setVisible(true);
	}
}

hardwired · #2 (**permalink**) 06-29-2008, 06:12 AM

Code:

tip = "<html>";
...
tip += some_data + "<br>";
...
tip += more_data;
...
return tip.

You can use a <center> tag if you like.

stevenc49 · #3 (**permalink**) 06-29-2008, 06:15 AM

Awesome. That's what I needed. Thanks!