searchform.java

英语背单词联网版本

/*
 * SearchForm.java
 *
 * Created on 2004年1月13日, 下午7:03
 */

package handenglish;

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import java.util.*;

/**
 *
 * @author  Administrator 
 * @version
 */
public class SearchForm extends Form implements ReceiveListener,CommandListener,Runnable{
    private Receive m_Receive;
    private Midlet midlet;
    private TextField m_Input;
    private Command m_CmdSearch;
    private StringItem m_Result;
    private Vector m_Words;
    private boolean doSearch = false;
    private Thread searchThread;
    
    public SearchForm(Midlet midlet) {
        super( "单词查询" );
        this.midlet = midlet;
        m_Receive = new Receive(midlet);
        m_Receive.setReceiveListener( this );
        m_Input = new TextField( "输入查询单词","",60,TextField.ANY );
        m_CmdSearch = new Command( "查询",Command.OK,0 );
        m_Words = new Vector();
        m_Result = new StringItem( "","" );
        append( m_Input );
        addCommand( m_CmdSearch );
        addCommand( midlet.cmdBack );
        setCommandListener( this );
        startThread();
    }
    
    public void dataReceived(int cmd, int status) {
        m_Result.setLabel( "查询结果" );
        StringBuffer strs = new StringBuffer();
        for( int i = 0;i< m_Words.size();i++ ) {
            strs.append( m_Words.elementAt(i) );
            strs.append( "\n\n" );
        }
        if ( m_Words.size() == 0 )
            m_Result.setText( "您查的单词未找到！" );
        else
            m_Result.setText( strs.toString() );
    }
    
    public void dataReceiving(int cmd, int pos, int total, int send) {
    }
    
    public void errorReceived(int errno) {
        Alert alert = new Alert( "错误信息","通讯错误,请与服务提供商联系!错误号=" + errno ,null,AlertType.ERROR );
        alert.setTimeout( Alert.FOREVER );
        Display.getDisplay( midlet ).setCurrent( alert );
    }
    
    public void setCurState(int curState) {
    }
    
    public void startThread() {
        if(searchThread==null)
            searchThread=new Thread(this);
        searchThread.start();
    }
    public void stopThread() {
        searchThread = null;
    }
    public void commandAction(Command c, Displayable s) {
        if ( c == midlet.cmdBack && s == this ) {
            stopThread();
            midlet.nowDisplay( s,midlet.WIN_MENU );
        }
        else if( c == m_CmdSearch && s == this ) {
            if (  m_Input.getString().equals( null ) || m_Input.getString().equals( "" ) )
            {
                Alert alert = new Alert( "警告信息","请输入查询单词！" ,null,AlertType.WARNING );
                alert.setTimeout( Alert.FOREVER );
                Display.getDisplay( midlet ).setCurrent( alert );
                return;
            }
            removeResult();
            m_Result.setLabel( "正在查询中，请稍候..." );
            m_Result.setText("");
            append( m_Result );
            doSearch = true;
        }
    }
    
    private void removeResult() {
        for( int i=0;i< size();i++ ) {
            Item item = get( i );
            if ( item == m_Result )
                delete( i );
        }
    }
    
    public void run() {
        Thread curThread = Thread.currentThread();
        while ( searchThread == curThread ) {
            try {
                Thread.sleep( 200 );
                if ( doSearch ) {
                    m_Receive.queryWord( m_Input.getString(),m_Words );
                    doSearch = false;
                }
            }catch(Exception e){
                //System.out.println(e.toString());
            }
        }
    }
}