layeredpanedemo.java

高等院校计算机应用技术硕士研究生课程,高级计算机网络程序设计实例子代码,GUI部分.

import javax.swing.*;
import javax.swing.border.*;
import javax.accessibility.*;

import java.awt.*;
import java.awt.event.*;

public class LayeredPaneDemo extends JFrame 
{
    //字符串数组和颜色数组
    private String[] layerStrings = { "Yellow (0)", "Magenta (1)", 
                                      "Cyan (2)", "Red (3)", 
                                      "Green (4)" };
    private Color[] layerColors = { Color.yellow, Color.magenta, 
                                    Color.cyan, Color.red,
                                    Color.green };

    //
    private JLayeredPane layeredPane;
    private JLabel dukeLabel;

    public LayeredPaneDemo()    
    {
        super("LayeredPaneDemo");

        //创建一个图标
        final ImageIcon icon = new ImageIcon("dukeWaveRed.gif");

        //创建一个layeredPane
        layeredPane = new JLayeredPane();
        //设置layeredPane的大小
        layeredPane.setPreferredSize(new Dimension(300, 310));
        //设置边界类型
        layeredPane.setBorder(BorderFactory.createTitledBorder(
                                    "Move the Mouse to Move Duke"));
                                    
        //添加鼠标移动事件
        //鼠标移动，图标也跟着移动
        layeredPane.addMouseMotionListener(new MouseMotionAdapter() 
        {
            final int XFUDGE = 40;
            final int YFUDGE = 57;
            public void mouseEntered(MouseEvent e) 
            {
                dukeLabel.setLocation(e.getX()-XFUDGE, e.getY()-YFUDGE);
            }
            public void mouseMoved(MouseEvent e) 
            {
                dukeLabel.setLocation(e.getX()-XFUDGE, e.getY()-YFUDGE);
            }
        });

        //创建一个点实例
        Point origin = new Point(10, 20);

        
        int offset = 35;

        //将label添加入layeredPane
        for (int i = 0; i < layerStrings.length; i++) 
        {
            JLabel label = createColoredLabel(layerStrings[i],
                                              layerColors[i], origin);
            //将label加入不同的层
            layeredPane.add(label, new Integer(i));  
            origin.x += offset;
            origin.y += offset;
        }

        //创建图表
        dukeLabel = new JLabel(icon);
        dukeLabel.setBounds(15, 225, 
                            icon.getIconWidth(),
                            icon.getIconHeight());
        layeredPane.add(dukeLabel, new Integer(2), 0);

        //绘制GUI的界面
        Container contentPane = getContentPane();
        contentPane.setLayout(new BoxLayout(contentPane,
                                            BoxLayout.Y_AXIS));
        contentPane.add(Box.createRigidArea(new Dimension(0, 10)));
        //添加控制面板
        contentPane.add(createControlPanel());
        contentPane.add(Box.createRigidArea(new Dimension(0, 10)));
        contentPane.add(layeredPane);
    }

    private JLabel createColoredLabel(String text, Color color,Point origin) 
    {
        JLabel label = new JLabel(text);
        label.setVerticalAlignment(JLabel.TOP);
        label.setHorizontalAlignment(JLabel.CENTER);
        label.setOpaque(true);
        label.setBackground(color);
        label.setForeground(Color.black);
        label.setBorder(BorderFactory.createLineBorder(Color.black));
        label.setBounds(origin.x, origin.y, 140, 140);
        return label;
    }

    private JPanel createControlPanel() 
    {
        final JCheckBox onTop = new JCheckBox("Top Position in Layer");
        onTop.setSelected(true);
        onTop.addActionListener(new ActionListener() 
        {
            public void actionPerformed(ActionEvent e) 
            {
                if (onTop.isSelected())
                    layeredPane.moveToFront(dukeLabel);
                else
                    layeredPane.moveToBack(dukeLabel);
            }
        });

        final JComboBox layerList = new JComboBox(layerStrings);
        layerList.setSelectedIndex(2);    
        layerList.addActionListener(new ActionListener () 
        {
            public void actionPerformed(ActionEvent e) 
            {
            	
                int position = onTop.isSelected() ? 0 : 1;
                layeredPane.setLayer(dukeLabel,
                                     layerList.getSelectedIndex(),
                                     position);
            }
        });
        
        JPanel controls = new JPanel();
        controls.add(layerList);
        controls.add(onTop);
        controls.setBorder(BorderFactory.createTitledBorder(
                                 "Choose Duke's Layer and Position"));
        return controls;
    }

    public static void main(String[] args) 
    {
        JFrame frame = new LayeredPaneDemo();

        frame.addWindowListener(new WindowAdapter() 
        {
            public void windowClosing(WindowEvent e) 
            {
                System.exit(0);
            }
        });

        frame.pack();
        frame.setVisible(true);
    }
}