package org.openswing.swing.tree.client;

import java.util.*;

import javax.swing.*;
import javax.swing.event.*;

public class AbstractCellEditor implements CellEditor {

    protected EventListenerList listenerList = new EventListenerList();

    public Object getCellEditorValue() { return null; }
    public boolean isCellEditable(EventObject e) { return true; }
    public boolean shouldSelectCell(EventObject anEvent) { return false; }
    public boolean stopCellEditing() { return true; }
    public void cancelCellEditing() {}

    public void addCellEditorListener(CellEditorListener l) {
	listenerList.add(CellEditorListener.class, l);
    }

    public void removeCellEditorListener(CellEditorListener l) {
	listenerList.remove(CellEditorListener.class, l);
    }

    /*
     * Notify all listeners that have registered interest for
     * notification on this event type.
     * @see EventListenerList
     */
    protected void fireEditingStopped() {
	// Guaranteed to return a non-null array
	Object[] listeners = listenerList.getListenerList();
	// Process the listeners last to first, notifying
	// those that are interested in this event
	for (int i = listeners.length-2; i>=0; i-=2) {
	    if (listeners[i]==CellEditorListener.class) {
		((CellEditorListener)listeners[i+1]).editingStopped(new ChangeEvent(this));
	    }
	}
    }

    /*
     * Notify all listeners that have registered interest for
     * notification on this event type.
     * @see EventListenerList
     */
    protected void fireEditingCanceled() {
	// Guaranteed to return a non-null array
	Object[] listeners = listenerList.getListenerList();
	// Process the listeners last to first, notifying
	// those that are interested in this event
	for (int i = listeners.length-2; i>=0; i-=2) {
	    if (listeners[i]==CellEditorListener.class) {
		((CellEditorListener)listeners[i+1]).editingCanceled(new ChangeEvent(this));
	    }
	}
    }
}
