combobox.html
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<TITLE>Using a JComboBox in a Cell in a JTable Component
(Java Developers Almanac Example)
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<META CONTENT="Patrick Chan" NAME="AUTHOR">
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<h3>
e958.
Using a JComboBox in a Cell in a JTable Component</h3>
If the possible values allowed in a column must be one from a small
fixed set of values, a combo box might be appropriate as the cell
editor for that column. By using a combo box, it is impossible for the
user to input an invalid value.
<pre>
JTable table = new JTable();
DefaultTableModel model = (DefaultTableModel)table.getModel();
// Add some columns
model.addColumn(<font color="#0066ff"><i>"A"</i></font>, <font color="#0066ff"><i>new Object[]{"item1"}</i></font>);
model.addColumn(<font color="#0066ff"><i>"B"</i></font>, <font color="#0066ff"><i>new Object[]{"item2"}</i></font>);
// These are the combobox values
String[] values = new String[]{<font color="#0066ff"><i>"item1"</i></font>, <font color="#0066ff"><i>"item2"</i></font>, <font color="#0066ff"><i>"item3"</i></font>};
// Set the combobox editor on the 1st visible column
int vColIndex = <font color="#0066ff"><i>0</i></font>;
TableColumn col = table.getColumnModel().getColumn(vColIndex);
col.setCellEditor(new MyComboBoxEditor(values));
// If the cell should appear like a combobox in its
// non-editing state, also set the combobox renderer
col.setCellRenderer(new MyComboBoxRenderer(values));
public class MyComboBoxRenderer extends JComboBox implements TableCellRenderer {
public MyComboBoxRenderer(String[] items) {
super(items);
}
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
if (isSelected) {
setForeground(table.getSelectionForeground());
super.setBackground(table.getSelectionBackground());
} else {
setForeground(table.getForeground());
setBackground(table.getBackground());
}
// Select the current value
setSelectedItem(value);
return this;
}
}
public class MyComboBoxEditor extends DefaultCellEditor {
public MyComboBoxEditor(String[] items) {
super(new JComboBox(items));
}
}
</pre>
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Related Examples
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e952. <a class="eglink" href="CustEdit.html?l=rel">
Creating a Custom Table Cell Editor in a JTable Component
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e953. <a class="eglink" href="ValidateValue.html?l=rel">
Preventing Invalid Values in a Cell in a JTable Component
</a>
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e954. <a class="eglink" href="CustEditClick.html?l=rel">
Setting the Activation Click Count for a Table Cell Editor in a JTable Component
</a>
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e955. <a class="eglink" href="StopEdit.html?l=rel">
Programmatically Starting and Stopping Cell Editing in a JTable Component
</a>
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e956. <a class="eglink" href="AnchorEdit.html?l=rel">
Creating a Text Field That Mirrors the Value in the Anchor Cell in a JTable Component
</a>
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e957. <a class="eglink" href="NoEdit.html?l=rel">
Disabling User Edits in a JTable Component
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e959. <a class="eglink" href="Spinner.html?l=rel">
Using a List JSpinner as a Cell Editor 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#Column%20Heads">
Column Heads
</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#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
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