/*
* Sun Public License Notice
*
* The contents of this file are subject to the Sun Public License
* Version 1.0 (the "License"). You may not use this file except in
* compliance with the License. A copy of the License is available at
* http://www.sun.com/
*
* The Original Code is Forte for Java, Community Edition. The Initial
* Developer of the Original Code is Sun Microsystems, Inc. Portions
* Copyright 1997-2000 Sun Microsystems, Inc. All Rights Reserved.
*/
package org.openide.actions;
import java.io.IOException;
import javax.swing.event.ChangeListener;
import javax.swing.event.ChangeEvent;
import org.openide.nodes.Index;
import org.openide.util.HelpCtx;
import org.openide.util.actions.*;
import org.openide.nodes.Node;
/** Move an item down in a list.
* This action is final only for performance reasons.
* @see Index
*
* @author Ian Formanek, Dafe Simonek
*/
public final class MoveDownAction extends NodeAction {
/** generated Serialized Version UID */
static final long serialVersionUID = -6895014137711668193L;
/** the key to listener to reorder of selected nodes */
private static final String PROP_ORDER_LISTENER = "sellistener"; // NOI18N
/** Holds index cookie on which we are listening */
private Index curIndexCookie;
/* Initilizes the set of properties.
*/
protected void initialize () {
super.initialize();
// initializes the listener
OrderingListener sl = new OrderingListener();
putProperty(PROP_ORDER_LISTENER, sl);
}
/* Actually performs the action of moving the node down
* in the order.
* @param activatedNodes The nodes on which to perform the action.
*/
protected void performAction (Node[] activatedNodes) {
// we need to check activatedNodes, because there's no
// guarantee that they not changed between enable() and
// performAction calls
Index cookie = getIndexCookie(activatedNodes);
if (cookie == null) return;
int nodeIndex = cookie.indexOf(activatedNodes[0]);
if ((nodeIndex >= 0) && (nodeIndex < (cookie.getNodesCount() - 1))) {
cookie.moveDown(nodeIndex);
}
}
/* Manages enable - disable logic of this action */
protected boolean enable (Node[] activatedNodes) {
// remove old listener, if any
if (curIndexCookie != null) {
curIndexCookie.removeChangeListener(
(OrderingListener)getProperty(PROP_ORDER_LISTENER));
curIndexCookie = null;
}
Index cookie = getIndexCookie(activatedNodes);
if (cookie == null) return false;
int nodeIndex = cookie.indexOf(activatedNodes[0]);
// now start listening to reordering changes
cookie.addChangeListener(
(OrderingListener)getProperty(PROP_ORDER_LISTENER));
curIndexCookie = cookie;
return (nodeIndex >= 0) && (nodeIndex < (cookie.getNodesCount() - 1));
}
/* Human presentable name of the action. This should be
* presented as an item in a menu.
* @return the name of the action
*/
public String getName() {
return ActionConstants.BUNDLE.getString("MoveDown");
}
/* Help context where to find more about the action.
* @return the help context for this action
*/
public HelpCtx getHelpCtx() {
return new HelpCtx (MoveDownAction.class);
}
/* Resource name for the icon.
* @return resource name
*/
protected String iconResource () {
return "/org/openide/resources/actions/moveDown.gif"; // NOI18N
}
/** Helper method. Returns index cookie or null, if some
* conditions aren't satisfied */
private Index getIndexCookie (Node[] activatedNodes) {
if ((activatedNodes == null) || (activatedNodes.length != 1))
return null;
Node parent = activatedNodes[0].getParentNode();
if (parent == null) return null;
return (Index)parent.getCookie(Index.class);
}
/** Listens to the ordering changes and enables/disables the
* action if appropriate */
private final class OrderingListener implements ChangeListener {
public void stateChanged (ChangeEvent e) {
Node[] activatedNodes = getActivatedNodes();
Index cookie = getIndexCookie(activatedNodes);
if (cookie == null)
setEnabled(false);
else {
int nodeIndex = cookie.indexOf(activatedNodes[0]);
setEnabled((nodeIndex >= 0) &&
(nodeIndex < (cookie.getNodesCount() - 1)));
}
}
}
}
/*
* Log
* 13 Gandalf 1.12 1/12/00 Ian Formanek NOI18N
* 12 Gandalf 1.11 10/22/99 Ian Formanek NO SEMANTIC CHANGE - Sun
* Microsystems Copyright in File Comment
* 11 Gandalf 1.10 6/24/99 Jesse Glick Gosh-honest HelpID's.
* 10 Gandalf 1.9 6/9/99 Ian Formanek Fixed resources for
* package change
* 9 Gandalf 1.8 6/8/99 Ian Formanek ---- Package Change To
* org.openide ----
* 8 Gandalf 1.7 5/28/99 Ian Formanek Cleaned up source
* (imports, ... - no semantic/english text change)
* 7 Gandalf 1.6 5/2/99 Ian Formanek Fixed last change
* 6 Gandalf 1.5 5/2/99 Ian Formanek Obsoleted
* help->DEFAULT_HELP
* 5 Gandalf 1.4 3/26/99 Jesse Glick [JavaDoc]
* 4 Gandalf 1.3 3/15/99 Ian Formanek Fixed enabling of
* actions in initialize ()
* 3 Gandalf 1.2 2/17/99 Ian Formanek Updated icons to point
* to the right package (under ide/resources)
* 2 Gandalf 1.1 1/7/99 Ian Formanek fixed resource names
* 1 Gandalf 1.0 1/5/99 Ian Formanek
* $
*/