Bug 12329 [Cell Editors] Request:ComboBoxCellEditor READ_ONLY style
Although CCombo accepts SWT.READ_ONLY style, there is no way to specify style when it is used in ComboBoxCellEditor. How about adding createControl(Composite parent, int style) method to ComboBoxCellEditor class?
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/CellEditor.java
* </p>
 * <p>
 * Subclasses may override
 * </p>
 * @return <code>true</code> if copy is possible,
 *  <code>false</code> otherwise
 */
public boolean isCopyEnabled() {
	return false;
}
/**
 * Returns whether the given value is valid for this cell editor.
 * This cell editor's validator (if any) makes the actual determination.
 *
 * @return <code>true</code> if the value is valid, and <code>false</code>
 *  if invalid
 */
protected boolean isCorrect(Object value) {
	errorMessage = null;
	if (validator == null)
		return true;
	errorMessage = validator.isValid(value);
	return (errorMessage == null || errorMessage.equals(""));
}
/**
 * Returns <code>true</code> if this cell editor is
 * able to perform the cut action.
 * <p>
 * This default implementation always returns 
 * <code>false</code>.