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<TITLE>Creating a Custom Column Header Renderer in a JTable Component (Java Developers Almanac Example)
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<h3>e936. Creating a Custom Column Header Renderer in a JTable Component</h3>
The default column header renderer simply display a single line of
text. If you need to display something other than this, you will need to
build and install your own column header renderer. This example
defines a generic renderer and installs it on a column.
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See <a href="../javax.swing.table/CustRend.html" class="eglink"><b>e928</b> Creating a Custom Cell Renderer in a JTable Component</a> for more information about
renderers.
<pre> JTable table = new JTable();
// Add data...
// Install the custom header renderer on the first visible column
int vColIndex = <font color="#0066ff"><i>0</i></font>;
TableColumn col = table.getColumnModel().getColumn(vColIndex);
col.setHeaderRenderer(new MyTableHeaderRenderer());
public class MyTableHeaderRenderer extends <font color="#0066ff"><i>JLabel</i></font> implements TableCellRenderer {
// This method is called each time a column header
// using this renderer needs to be rendered.
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int rowIndex, int vColIndex) {
// 'value' is column header value of column 'vColIndex'
// rowIndex is always -1
// isSelected is always false
// hasFocus is always false
// Configure the component with the specified value
<font color="#0066ff"><i>setText(value.toString())</i></font>;
// Set tool tip if desired
setToolTipText(<font color="#0066ff"><i>(String)value</i></font>);
// Since the renderer is a component, return itself
return this;
}
// The following methods override the defaults for performance reasons
public void validate() {}
public void revalidate() {}
protected void firePropertyChange(String propertyName, Object oldValue, Object newValue) {}
public void firePropertyChange(String propertyName, boolean oldValue, boolean newValue) {}
}
</pre>
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<b>Related Examples</b></font></td>
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e931. <a class="eglink" href="ShowHead.html?l=rel">
Showing the Table Header in a Non-Scrollable JTable Component
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e932. <a class="eglink" href="ChangeHeadName.html?l=rel">
Changing the Name of a Column in a JTable Component
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e933. <a class="eglink" href="IconHead.html?l=rel">
Displaying an Icon in a Column Head of a JTable Component
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e934. <a class="eglink" href="HeadHeight.html?l=rel">
Implementing Variable-Height Column Headers in a JTable Component
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e935. <a class="eglink" href="NoHead.html?l=rel">
Removing the Column Headers from a Scrollable in a JTable Component
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See also:
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Cells">
Cells
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Columns">
Columns
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Editing">
Editing
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Events">
Events
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Layout">
Layout
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Rows">
Rows
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Scrolling">
Scrolling
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Selection">
Selection
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Sorting">
Sorting
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Table%20Model">
Table Model
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Tool%20Tips">
Tool Tips
</a>
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