//// Copyright 2002 Nokia Corporation.//// THIS SOURCE CODE IS PROVIDED 'AS IS', WITH NO WARRANTIES WHATSOEVER,// EXPRESS OR IMPLIED, INCLUDING ANY WARRANTY OF MERCHANTABILITY, FITNESS// FOR ANY PARTICULAR PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE// OR TRADE PRACTICE, RELATING TO THE SOURCE CODE OR ANY WARRANTY OTHERWISE// ARISING OUT OF ANY PROPOSAL, SPECIFICATION, OR SAMPLE AND WITH NO// OBLIGATION OF NOKIA TO PROVIDE THE LICENSEE WITH ANY MAINTENANCE OR// SUPPORT. FURTHERMORE, NOKIA MAKES NO WARRANTY THAT EXERCISE OF THE// RIGHTS GRANTED HEREUNDER DOES NOT INFRINGE OR MAY NOT CAUSE INFRINGEMENT// OF ANY PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OWNED OR CONTROLLED// BY THIRD PARTIES//// Furthermore, information provided in this source code is preliminary,// and may be changed substantially prior to final release. Nokia Corporation// retains the right to make changes to this source code at any time,// without notice. This source code is provided for informational// purposes only.//// Nokia and Nokia Connecting People are registered trademarks of Nokia// Corporation. Java and all Java-based marks are trademarks or registered// trademarks of Sun Microsystems, Inc. Other product and company names// mentioned herein may be trademarks or trade names of their respective owners.//// A non-exclusive, non-transferable, worldwide, limited license is hereby// granted to the Licensee to download, print, reproduce and modify the// source code. The licensee has the right to market, sell, distribute and// make available the source code in original or modified form only when// incorporated into the programs developed by the Licensee. No other// license, express or implied, by estoppel or otherwise, to any other// intellectual property rights is granted herein.//import javax.microedition.lcdui.*;class PeerList     extends Form     implements CommandListener, ItemStateListener{    private final ChatMIDlet parent;    private final ChoiceGroup peers;    private final Command okCommand, backCommand, newCommand;    private final Command editCommand, removeCommand;    private boolean isElementSelected = false;    PeerList(ChatMIDlet parent, String[] peerNames)    {        super("Choose Peers");        this.parent = parent;        peers = new ChoiceGroup("", List.MULTIPLE, peerNames, null);        append(peers);        okCommand = new Command("OK", Command.OK, 1);        backCommand = new Command("Back", Command.BACK, 2);        newCommand = new Command("New", Command.SCREEN, 2);        editCommand = new Command("Edit", Command.SCREEN, 2);        removeCommand = new Command("Remove", Command.SCREEN, 2);        addCommand(backCommand);        addCommand(newCommand);        setCommandListener(this);        setItemStateListener(this);    }    void init(String[] names)    {        while (peers.size() > 0)        {            peers.delete(0);        }        for (int i = 0; i < names.length; i++)        {            peers.append(names[i], null);        }        elementUnselected();    }    public void itemStateChanged(Item item)    {        for (int i = 0; i < peers.size(); i++)        {            if (peers.isSelected(i))            {                if (!isElementSelected)                {                    elementSelected();                }                return;            }        }        elementUnselected();    }    private void elementUnselected()    {        removeCommand(newCommand);        removeCommand(okCommand);        removeCommand(editCommand);        removeCommand(removeCommand);        addCommand(newCommand);        isElementSelected = false;    }    private void elementSelected()    {        removeCommand(okCommand);        removeCommand(editCommand);        removeCommand(removeCommand);        removeCommand(newCommand);        addCommand(okCommand);        addCommand(editCommand);        addCommand(removeCommand);        isElementSelected = true;    }    public void commandAction(Command c, Displayable d)    {        if (c == okCommand || c == removeCommand)        {            // get selected names and put them to an array            int peerNum = 0;            int i;            for (i = 0; i < peers.size(); i++)            {                peerNum += peers.isSelected(i) ? 1 : 0;            }            String[] peerNames = new String[peerNum];            int k = 0;            for (i = 0; i < peers.size() && k < peerNum; i++)            {                if (peers.isSelected(i))                {                    peerNames[k] = peers.getString(i);                    k++;                }            }            if (c == okCommand)            {                parent.peerListDone(peerNames);            }            else            {                // removeCommand                for (i = peers.size() - 1, k = peerNum; i >= 0 && k > 0; i--)                {                    if (peers.isSelected(i))                    {                        peers.delete(i);                        k--;                    }                }                elementUnselected();                parent.peerListRemove(peerNames);            }        }        else if (c == newCommand)        {            parent.peerListNew();        }        else if (c == editCommand)        {            int i = 0;            for (; i < peers.size() - 1 && !peers.isSelected(i); i++)            {                ;            }            parent.peerListEdit(peers.getString(i));        }        else        {            // backCommand            parent.peerListBack();        }    }    public int size()    {        return peers.size();    }}