colheadtips.html

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<TITLE>Setting Column Header Tool Tips in a JTable Components
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  <h3>
    e936.  
    Setting Column Header Tool Tips in a JTable Components</h3>

The way in which to display a tool tip for a column header is to
install a mouse motion listener on the header component and change its
tool tip based on which column header is under the cursor.


<pre>
    int rows = <font color="#0066ff"><i>10</i></font>;
    int cols = <font color="#0066ff"><i>5</i></font>;
    JTable table = new JTable(rows, cols);
    JTableHeader header = table.getTableHeader();
    
    ColumnHeaderToolTips tips = new ColumnHeaderToolTips();
    
    // Assign a tooltip for each of the columns
    for (int c=0; c&lt;table.getColumnCount(); c++) {
        TableColumn col = table.getColumnModel().getColumn(c);
        tips.setToolTip(col, <font color="#0066ff"><i>"Col "+c</i></font>);
    }
    header.addMouseMotionListener(tips);
    
    public class ColumnHeaderToolTips extends MouseMotionAdapter {
        // Current column whose tooltip is being displayed.
        // This variable is used to minimize the calls to setToolTipText().
        TableColumn curCol;
    
        // Maps TableColumn objects to tooltips
        Map tips = new HashMap();
    
        // If tooltip is null, removes any tooltip text.
        public void setToolTip(TableColumn col, String tooltip) {
            if (tooltip == null) {
                tips.remove(col);
            } else {
                tips.put(col, tooltip);
            }
        }
    
        public void mouseMoved(MouseEvent evt) {
            TableColumn col = null;
            JTableHeader header = (JTableHeader)evt.getSource();
            JTable table = header.getTable();
            TableColumnModel colModel = table.getColumnModel();
            int vColIndex = colModel.getColumnIndexAtX(evt.getX());
    
            // Return if not clicked on any column header
            if (vColIndex &gt;= 0) {
                col = colModel.getColumn(vColIndex);
            }
    
            if (col != curCol) {
                header.setToolTipText((String)tips.get(col));
                curCol = col;
            }
        }
    }
</pre>
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            &nbsp;Related Examples
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e937. <a class="eglink" href="Tips.html?l=rel">
    Setting Tool Tips on Cells in a JTable Component
</a>
<br>


<table width="600" CELLSPACING="0" CELLPADDING="2" BORDER="0">
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<br>
        See also: 
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Cells">
    Cells
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Column%20Heads">
    Column Heads
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Columns">
    Columns
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Editing">
    Editing
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Events">
    Events
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Layout">
    Layout
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Rows">
    Rows
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Scrolling">
    Scrolling
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Selection">
    Selection
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Sorting">
    Sorting
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Table%20Model">
    Table Model
</a>&nbsp;&nbsp;

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