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Tip of the Day
Language:
Expertise: Beginner
Jan 5, 2005

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Make Cell Data Visible with a MouseMotionListener

At times, the width of a table column is so constrained that it obscures the data. Sometimes, the data is obscured because data itself too large for the cell. To alleviate this problem, you can use a MouseMotionListener to tap the mouse motion event and display the necessary data. So when the user brings the mouse cursor over a cell, the data in that cell is taken and displayed as a tooltip.

The following code sets the tooltip for the second column in a table. If the mouse cursor is moved over any other column, the tooltip is not displayed at all.


table.addMouseMotionListener(new MouseMotionAdapter() {
    public void mouseMoved(MouseEvent me) {
	int iRow = table.rowAtPoint(me.getPoint());
	int iCol = table.columnAtPoint(me.getPoint());

	if((iRow < 0) || (iCol < 0))
	    return;
	String toolTip = (String)table.getValueAt(iRow,iCol);
	if(iCol == 2) {
	    table.setToolTipText(toolTip);
	} else {
	    toolTip = null;
	    table.setToolTipText(toolTip);
	}

    }
});
Some values, like the Column number have been hard-coded in the interest of brevity.
Jeevan Joseph
 
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