statusbar.java

该系统是一个基于p2p的即时聊天系统

/*
 * @(#) StatusBar.java
 * Copyright 2004 HWStudio. All rights reserved.
 */
package hws.item.smart.panel.statusbar;
//导入核心Java类库
import java.awt.Insets;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.Timer;
//导入自定义Java类库
import hws.item.smart.misc.BorderShop;
import hws.item.smart.misc.PopToolkit;
/**
 * 主窗体的状态栏
 *
 * @version 0.1 2005-07-21
 * @author Hwerz
 */
public class StatusBar extends JPanel {
    /*------------------------------------------------------------------------*
     *                                属性定义                                *
     *------------------------------------------------------------------------*/
    /**
     * 该类自身的一个静态引用
     */
    private static StatusBar bar;
    /**
     * 显示提示信息的标签
     */
    private JLabel hintLabel;
    /**
     * 显示日期信息的标签
     */
    private JLabel dateLabel;
    /**
     * 显示时间信息的标签
     */
    private JLabel timeLabel;
    /*------------------------------------------------------------------------*
     *                                构造函数                                *
     *------------------------------------------------------------------------*/
    /**
     * 构造函数为私有，这样在整个运行过程中该类就只能有一个实例
     */
    private StatusBar() {
        super(new GridBagLayout());
        //显示提示信息的标签
        hintLabel = new JLabel("如需帮助，请按F1", JLabel.LEFT);
        hintLabel.setBorder(BorderShop.LOWERED_THIN_BEVEL_BORDER);
        GridBagConstraints constraints = new GridBagConstraints(
            //gridx, gridy
            0, 0,
            //gridwidth, gridheight
            1, 1,
            //weightx, weighty
            1.0, 0.0,
            //anchor
            GridBagConstraints.LINE_START,
            //fill
            GridBagConstraints.HORIZONTAL,
            //insets
            new Insets(0, 0, 0, 0),
            //ipadx, ipady
            0, 0);
        add(hintLabel, constraints);
        //显示日期信息的标签
        dateLabel = new JLabel(PopToolkit.getCurrentDate());
        dateLabel.setBorder(BorderShop.LOWERED_THIN_BEVEL_BORDER);
        constraints.gridx = 1;
        constraints.weightx = 0.0;
        constraints.fill = GridBagConstraints.NONE;
        add(dateLabel, constraints);
        //显示时间信息的标签
        timeLabel = new JLabel(PopToolkit.getCurrentTime());
        timeLabel.setBorder(BorderShop.LOWERED_THIN_BEVEL_BORDER);
        constraints.gridx = 2;
        add(timeLabel, constraints);
        Timer timer = new Timer(1000, new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                timeLabel.setText(PopToolkit.getCurrentTime());
            }
        });
        timer.start();
    }
    /*------------------------------------------------------------------------*
     *                                公共方法                                *
     *------------------------------------------------------------------------*/
    /**
     * 对该类提供的一个全局访问点，用来实例化该对象
     *
     * @return 该类唯一的一个实例
     */
    public static StatusBar getInstance() {
        if (bar == null) {
            bar = new StatusBar();
        }
        return bar;
    }
    /**
     * 设置提示信息标签的内容
     *
     * @param hint 提示信息标签的内容
     */
    public void setHintInfo(String hint) {
        hintLabel.setText(hint);
    }
}