source: trunk/hiptop/cognet++/org/twodot/cognet/LinkMenu.java

/*
 * cognet chat app
 *
 * Copyright 2003, Daniel Grobe Scahs <sachs@uiuc.edu>
 * See LICENSE for redistribution terms
 *
 */
package org.twodot.cognet;

import danger.ui.Menu;
import danger.ui.MenuItem;

class LinkQueue 
{
        public static final int maxQueueLen = 9;
        
        private String LinkURLs[] = new String[maxQueueLen];
        private String LinkNames[] = new String[maxQueueLen]; 
        private int queueLen = 0;

        public void addLink(String URL, String Name)
        {
                System.err.println("Adding "+URL);
                if( queueLen < maxQueueLen )
                        queueLen++;
                else
                {
                        int i;

                        for( i = 0; i < queueLen-1; i++ )
                        {
                                LinkURLs[i] = LinkURLs[i+1];
                                LinkNames[i] = LinkNames[i+1];
                        }
                }

                if( Name.length() == 0 )
                        Name = URL;

                LinkURLs[queueLen-1] = URL;
                LinkNames[queueLen-1] = Name;
        }

        public String[] getNames()
        {
                return LinkNames;
        }

        public String[] getURLs()
        {
                return LinkURLs;
        }

        public int getQueueLen()
        {
                return queueLen;
        }
}


public class LinkMenu
{
        public static final int maxLinkMenus = 9;
        public static final int maxLinkTargets = maxLinkMenus * LinkQueue.maxQueueLen;

        int numMenus;

        public String Categories[] = new String[maxLinkMenus];
        public LinkQueue Queue[] = new LinkQueue[maxLinkMenus];

        public String LinkTarget[] = new String[maxLinkTargets];

        public void AddLink(String URL, String Category, String Name)
        {
                synchronized(this)
                {
                        int catIndex = findCategory(Category);
                        Queue[catIndex].addLink(URL, Name);
                }
        }

        public Menu makeLinkMenu(int base)
        {
                Menu Linkmenu;
                int i,j;
                int index = 0; 

                Menu links = new Menu("Links");
                MenuItem mi;

                synchronized(this)
                {
                        if( numMenus == 0 )
                                return null;

                        for( i = 0; i < numMenus; i++ )
                        {
                                int size;
                                String Names[], URLs[];

                                Menu submenu = new Menu(Categories[i]);

                                size = Queue[i].getQueueLen();
                                Names = Queue[i].getNames();
                                URLs = Queue[i].getURLs();

                                for( j = size-1; j >= 0;  j-- )
                                {
                                        submenu.addItem(Names[j],index+base);
                                        LinkTarget[index++] = URLs[j];
                                }

                                mi = links.addItem(Categories[i]);
                                mi.addSubMenu(submenu);
                        }
                }

                return links;
        }

        public void dispatchLink(int target, int base)
        {
                System.err.println("Dispatch to "+LinkTarget[target-base]);

                try 
                {
                        danger.net.URL.gotoURL(LinkTarget[target-base]);
                }
                catch( Exception e )
                {
                }
        }

        private int findCategory(String Category)
        {
                int i;

                for( i=0; i < numMenus; i++ )
                {
                        if( 0 == Category.compareTo(Categories[i]) )
                                return i;
                }

                if( numMenus == maxLinkMenus )
                {
                        for( i=0; i < numMenus-1; i++ )
                        {
                                Categories[i] = Categories[i+1];
                                Queue[i] = Queue[i+1];
                        }
                }
                else
                        numMenus ++;

                Categories[numMenus - 1] = Category;
                Queue[numMenus - 1] = new LinkQueue();

                return numMenus - 1;
        }
}