/*
 *                 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 NetBeans. The Initial Developer of the Original
 * Code is Sun Microsystems, Inc. Portions Copyright 1997-2000 Sun
 * Microsystems, Inc. All Rights Reserved.
 */

package org.netbeans.examples.modules.shownodeactions;

import java.util.*;
import java.beans.*;
import javax.swing.*;

import org.openide.nodes.*;
import org.openide.util.actions.*;
import org.openide.windows.TopComponent;

public class ShowNodeActionsMenu extends JMenu {

    public ShowNodeActionsMenu () {
        System.err.println("Creating ShowNodeActionsMenu...");
        // [PENDING] really the list of things should be shared state, and only
        // the physical menu part of instance state, but whatever...
        addPropertyChangeListener (new PropertyChangeListener () {
                                       public void propertyChange (PropertyChangeEvent ev) {
                                           if ("ancestor".equals (ev.getPropertyName ()))
                                               update ();
                                       }
                                   });
        TopComponent.getRegistry ().addPropertyChangeListener (new PropertyChangeListener () {
                    public void propertyChange (PropertyChangeEvent ev) {
                        if (isShowing () && TopComponent.Registry.PROP_CURRENT_NODES.equals (ev.getPropertyName ()))
                            update ();
                    }
                });
    }

    private void update () {
        //System.err.println("update");
        removeAll ();

        Node[] nodes = TopComponent.getRegistry ().getCurrentNodes ();
        if (nodes == null) nodes = new Node[] {};

        // Adapted from org.openide.nodes.NodeOp algorithm:
        // hashtable: SystemAction -> Integer
        HashMap actions = new HashMap ();

        // counts the number of occurences for each action
        for (int n = 0; n < nodes.length; n++) {
            SystemAction[] arr = nodes[n].getActions ();
            if (arr == null) {
                // use default actions
                arr = NodeOp.getDefaultActions ();
            }
            for (int i = 0; i < arr.length; i++) {
                if (arr[i] != null) {
                    Integer cntInt = (Integer)actions.get (arr[i]);
                    int cnt = cntInt == null ? 0 : cntInt.intValue ();
                    actions.put (arr[i], new Integer (cnt + 1));
                }
            }
        }

        // take all actions that are nodes.length number times
        if (!actions.isEmpty ()) {
            SystemAction[] arr = nodes[0].getActions ();
            if (arr == null) {
                // use default
                arr = NodeOp.getDefaultActions ();
            }
            boolean canSep = false;
            for (int i = 0; i < arr.length; i++) {
                boolean addSep = true;
                if (arr[i] != null) {
                    Integer cntInt = (Integer)actions.get (arr[i]);
                    int cnt = cntInt == null ? 0 : cntInt.intValue ();
                    if (cnt == nodes.length) {
                        addSep = false;
                        canSep = true;
                        JMenuItem item;
                        //System.err.println("adding " + arr[i]);
                        // Use popup presenters, not menu, because they are faster to display:
                        if (arr[i] instanceof Presenter.Popup) {
                            item = ((Presenter.Popup) arr[i]).getPopupPresenter ();
                        } else {
                            item = new JMenuItem (arr[i].getName ());
                            item.setEnabled (false);
                        }
                        add (item);
                    }
                }

                if (addSep && canSep) {
                    addSeparator ();
                    canSep = false;
                }
            }
        }

        setEnabled (getMenuComponentCount () > 0);
        switch (nodes.length) {
        case 0:
            setText ("(No selection)");
            break;
        case 1:
            setText ("Popup: " + nodes[0].getDisplayName ());
            break;
        default:
            setText ("Popup: (" + nodes.length + " nodes)");
            break;
        }
    }

}