Displaying an Icon in a Column Head of a JTable Component
Although the default renderer for a table header is a JLabel, the
default renderer will only display text. This example demonstrates
how to install a custom renderer that can display text as well as
icons.
DefaultTableModel model = new DefaultTableModel();
JTable table = new JTable(model);
// Create 2 columns
model.addColumn("Col1");
model.addColumn("Col2");
// the header value for this column will be overwritten
// with a TextandIcon object
// Set the icon renderer on the second column
table.getTableHeader().getColumnModel()
.getColumn(1).setHeaderRenderer(iconHeaderRenderer);
// Set the text and icon values on the second column for the icon render
table.getColumnModel().getColumn(1).setHeaderValue(
new TextAndIcon("Col2", new ImageIcon("icon.gif")));
// This class is used to hold the text and icon values
// used by the renderer that renders both text and icons
class TextAndIcon {
TextAndIcon(String text, Icon icon) {
this.text = text;
this.icon = icon;
}
String text;
Icon icon;
}
// This customized renderer can render objects of the type TextandIcon
TableCellRenderer iconHeaderRenderer = new DefaultTableCellRenderer() {
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
// Inherit the colors and font from the header component
if (table != null) {
JTableHeader header = table.getTableHeader();
if (header != null) {
setForeground(header.getForeground());
setBackground(header.getBackground());
setFont(header.getFont());
}
}
if (value instanceof TextAndIcon) {
setIcon(((TextAndIcon)value).icon);
setText(((TextAndIcon)value).text);
} else {
setText((value == null) ? "" : value.toString());
setIcon(null);
}
setBorder(UIManager.getBorder("TableHeader.cellBorder"));
setHorizontalAlignment(JLabel.CENTER);
return this;
}
};
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