friendlistview.java

用java写的聊天系统

/*
 * FriendListView.java
 *
 * Created on 2005年12月20日, 下午6:38
 *
 * To change this template, choose Tools | Options and locate the template under
 * the Source Creation and Management node. Right-click the template and choose
 * Open. You can then make changes to the template in the Source Editor.
 */

package javaicqproj;

/**
 *
 * @author hurysa
 */

import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
import java.util.*;

public class FriendListView extends JList implements Observer{
    
    NameAndPicListModel model=new NameAndPicListModel();
    ListCellRenderer renderer=new NameAndPicListCellRenderer();
    private String [] picsonline=new String []{"1.jpg","3.jpg","5.jpg","7.jpg"};
    private String [] picsoffline=new String[]{"2.jpg","4.jpg","6.jpg","8.jpg"};
    
    /**
     * Creates a new instance of FriendListView 
     */
    public FriendListView() {
        this.setModel(model);
        this.setCellRenderer(renderer);
    }

    /** Implements method update of interface java.util.Observer */
    public void update(Observable o, Object arg) {
        FriendInfoModel m=(FriendInfoModel)o;
        int picid;
        model.removeAllElements();
        for(int p=0;p<m.getFriendNum();p++){
            picid=Integer.parseInt(m.getFriendPic().get(p).toString());
            if(m.getFriendStatus().get(p).equals("上线")){
                model.addElement(new Object[]{m.getFriendNames().get(p),new ImageIcon(picsonline[picid])});}
            else
                model.addElement(new Object[]{m.getFriendNames().get(p),new ImageIcon(picsoffline[picid])});
        }//for
    }

    class NameAndPicListModel extends DefaultListModel{
        public NameAndPicListModel(){
            removeAllElements();
        }
        public NameAndPicListModel(Vector friendnames,String [] pics){
            removeAllElements();
            for(int i=0;i<friendnames.size();i++){
                addElement(new Object[]{friendnames.get(i),new ImageIcon(pics[i])});
            }
        }
        public  String getName(Object object){
            Object[] array=(Object[])object;
            return(String) array[0];
        }
        public Icon getIcon(Object object){
            Object[] array=(Object[]) object;
            return (Icon) array[1];
        }
    }
    
    class NameAndPicListCellRenderer extends JLabel implements ListCellRenderer{
        private Border lineBorder=BorderFactory.createLineBorder(Color.red,2),
                emptyBorder =BorderFactory.createEmptyBorder(2,2,2,2);
        public NameAndPicListCellRenderer(){
            setOpaque(true);
        }
        public Component getListCellRendererComponent(JList list,Object value,int index,
                boolean isSelected,boolean cellHasFocus){
            NameAndPicListModel model=(NameAndPicListModel) list.getModel();
            setText(model.getName(value));
            setIcon(model.getIcon(value));
            if(isSelected){
                setForeground(list.getSelectionForeground());
                setBackground(list.getSelectionBackground());
            }
            else{
                setForeground(list.getForeground());
                setBackground(list.getBackground());
            }
            if(cellHasFocus) setBorder(lineBorder);
            else setBorder(emptyBorder);
            return this;
        }
    }
    
}