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
}
/**
 * Sets the valid state of this cell editor.
 * The default value is false.
 * Subclasses should call this method on construction.
 *
 * @param valid <code>true</code> if the current valie is valid,
 *  and <code>false</code> if invalid
 *
 * @see #isValueValid
 */
protected void setValueValid(boolean valid) {
	this.valid = valid;
}
/**
 * The value has changed.  
 * Updates the valid state flag, marks this cell editor as dirty,
 * and notifies all registered cell editor listeners of a value change.
 *
 * @param oldValidState the valid state before the end user changed the value
 * @param newValidState the current valid state
 * @see ICellEditorListener#editorValueChanged
 */
protected void valueChanged(boolean oldValidState, boolean newValidState) {
	valid = newValidState;
	dirty = true;
	fireEditorValueChanged(oldValidState, newValidState);
}
}