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<TITLE>Displaying an Icon in a Column Head of a JTable Component
(Java Developers Almanac Example)
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<META CONTENT="Patrick Chan" NAME="AUTHOR">
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<h3>
e932.
Displaying an Icon in a Column Head of a JTable Component</h3>
Although the default renderer for a table header is a <code>JLabel</code>, the
default renderer will only display text. This example demonstrates
how to install a custom renderer that can display text as well as
icons.
<pre>
DefaultTableModel model = new DefaultTableModel();
JTable table = new JTable(model);
// Create 2 columns
model.addColumn(<font color="#0066ff"><i>"Col1"</i></font>);
model.addColumn(<font color="#0066ff"><i>"Col2"</i></font>);
// 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(<font color="#0066ff"><i>"Col2"</i></font>, new ImageIcon(<font color="#0066ff"><i>"icon.gif"</i></font>)));
// 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;
}
};
</pre>
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Related Examples
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e930. <a class="eglink" href="ShowHead.html?l=rel">
Showing the Table Header in a Non-Scrollable JTable Component
</a>
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e931. <a class="eglink" href="ChangeHeadName.html?l=rel">
Changing the Name of a Column in a JTable Component
</a>
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e933. <a class="eglink" href="HeadHeight.html?l=rel">
Implementing Variable-Height Column Headers in a JTable Component
</a>
<br>
e934. <a class="eglink" href="NoHead.html?l=rel">
Removing the Column Headers from a Scrollable in a JTable Component
</a>
<br>
e935. <a class="eglink" href="CustHeadRend.html?l=rel">
Creating a Custom Column Header Renderer in a JTable Component
</a>
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<table width="600" CELLSPACING="0" CELLPADDING="2" BORDER="0">
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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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</tr>
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