带半透明菜单的记事本的图形化组件，半透明图形化,带半透明菜单的记事本的图

带半透明菜单的记事本的图形化组件，半透明图形化,带半透明菜单的记事本的图

带半透明菜单的记事本的图形化组件

CustomMenuItemUI.java

import java.awt.*;import java.awt.image.*;import javax.swing.*;import javax.swing.plaf.*;import javax.swing.plaf.basic.*;public class CustomMenuItemUI extends BasicMenuItemUI {    public static ComponentUI createUI(JComponent c) {        return new CustomMenuItemUI();    }    public void paint(Graphics g, JComponent comp) {        // paint to the buffered image        BufferedImage bufimg = new BufferedImage(            comp.getWidth(),            comp.getHeight(),            BufferedImage.TYPE_INT_ARGB);        Graphics2D g2 = bufimg.createGraphics();        // restore the foreground color in case the superclass needs it        g2.setColor(g.getColor());        super.paint(g2,comp);        // do an alpha composite        Graphics2D gx = (Graphics2D) g;        gx.setComposite(AlphaComposite.getInstance(            AlphaComposite.SRC_OVER,0.8f));        gx.drawImage(bufimg,0,0,null);    }}

CustomPopupMenuUI.java

import javax.swing.*;import javax.swing.plaf.*;import javax.swing.plaf.basic.*;public class CustomPopupMenuUI extends BasicPopupMenuUI {    public static ComponentUI createUI(JComponent c) {        return new CustomPopupMenuUI();    }    public void installUI(JComponent c) {        super.installUI(c);        popupMenu.setOpaque(false);    }    public Popup getPopup(JPopupMenu popup, int x, int y) {        Popup pp = super.getPopup(popup,x,y);        JPanel panel = (JPanel)popup.getParent();        panel.setOpaque(false);        return pp;    }}

Notebook.java

import java.awt.*;import java.awt.event.*;import java.io.*;import javax.swing.*;public class Notebook extends JFrame {    static {        UIManager.put("PopupMenuUI", "CustomPopupMenuUI");        UIManager.put("MenuItemUI", "CustomMenuItemUI");    }    private static final long serialVersionUID = 1L;    private JTextArea jta = new JTextArea();    private JScrollPane jsp = new JScrollPane(jta);    private JPopupMenu jm = EditPopupMenu();    public static void main(String[] args) {        new Notebook();    }    public Notebook() {        JMenu menu = EditMenu();        JMenuItem jmi2 = new JMenuItem("打开");        jmi2.setActionCommand("打开");        jmi2.addActionListener(new Mylistener());        JMenuItem jmi3 = new JMenuItem("保存");        jmi3.setActionCommand("保存");        JMenuItem jmiexit = new JMenuItem("退出");        jmiexit.setActionCommand("退出");        jmi3.addActionListener(new Mylistener());        JMenuItem jmi4 = new JMenuItem("查看帮助");        jmi4.setActionCommand("查看帮助");        jmiexit.addActionListener(new Mylistener());        jmi4.addActionListener(new Mylistener());        JMenu jm1 = new JMenu("文件");        jm1.add(jmi2);        jm1.add(jmi3);        jm1.addSeparator();        jm1.add(jmiexit);        JMenu jm2 = new JMenu("帮助");        jm2.add(jmi4);        JMenuBar jbr = new JMenuBar();        jbr.add(jm1);        jbr.add(menu);        jbr.add(jm2);        this.add(jsp);        this.add(jbr, BorderLayout.NORTH);        jta.addMouseListener(new MouseAdapter() {            public void mouseClicked(MouseEvent e) {                if (e.getButton() == MouseEvent.BUTTON3) {                    jm.show(jta, e.getX(), e.getX());                }            }        });        this.setTitle("记事本");        this.setSize(600, 500);        this.setLocation(200, 200);        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        this.setVisible(true);    }    private JMenu EditMenu() {        JMenuItem jmicut, jmicopy, jmipaste, jmiSelectAll;        jmicut = new JMenuItem("剪切");        jmicut.setActionCommand("剪切");        jmicut.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent arg0) {                jta.cut();            }        });        jmicopy = new JMenuItem("复制");        jmicopy.setActionCommand("复制");        jmicopy.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent arg0) {                jta.copy();            }        });        jmipaste = new JMenuItem("粘贴");        jmipaste.setActionCommand("粘贴");        jmipaste.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent arg0) {                jta.paste();            }        });        jmiSelectAll = new JMenuItem("全选");        jmiSelectAll.setActionCommand("全选");        jmiSelectAll.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent arg0) {                jta.selectAll();            }        });        JMenu menu = new JMenu("编辑");        menu.add(jmicut);        menu.add(jmicopy);        menu.add(jmipaste);        menu.addSeparator();        menu.add(jmiSelectAll);        return menu;    }    private JPopupMenu EditPopupMenu() {        JMenuItem jmicut, jmicopy, jmipaste, jmiSelectAll;        jmicut = new JMenuItem("剪切");        jmicut.setActionCommand("剪切");        jmicut.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent arg0) {                jta.cut();            }        });        jmicopy = new JMenuItem("复制");        jmicopy.setActionCommand("复制");        jmicopy.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent arg0) {                jta.copy();            }        });        jmipaste = new JMenuItem("粘贴");        jmipaste.setActionCommand("粘贴");        jmipaste.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent arg0) {                jta.paste();            }        });        jmiSelectAll = new JMenuItem("全选");        jmiSelectAll.setActionCommand("全选");        jmiSelectAll.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent arg0) {                jta.selectAll();            }        });        JPopupMenu menu = new JPopupMenu("编辑");        menu.add(jmicut);        menu.add(jmicopy);        menu.add(jmipaste);        menu.addSeparator();        menu.add(jmiSelectAll);        return menu;    }    class Mylistener implements ActionListener {        private BufferedReader bfd = null;        private BufferedWriter bfw = null;        private JFileChooser jfc = null;        private FileReader fd = null;        private FileWriter fw = null;        public void actionPerformed(ActionEvent arg0) {            if (arg0.getActionCommand().equals("打开")) {                jfc = new JFileChooser();                jfc.setDialogTitle("请选择要打开的文件");                jfc.showOpenDialog(null);                jfc.setVisible(true);                File f = jfc.getSelectedFile();                if (f != null) {                    String filename = f.getAbsolutePath();                    try {                        fd = new FileReader(filename);                        bfd = new BufferedReader(fd);                        String s;                        StringBuilder allstring = new StringBuilder();                        while ((s = bfd.readLine()) != null) {                            allstring.append(s);                            allstring.append('\n');                        }                        jta.setText(allstring.toString());                        jta.setToolTipText(filename);                    } catch (Exception e) {                        e.printStackTrace();                    } finally {                        try {                            fd.close();                            bfd.close();                        } catch (IOException e) {                            e.printStackTrace();                        }                    }                }            } else if (arg0.getActionCommand().equals("保存")) {                // 很重要的一个组件JFileChooser                jfc = new JFileChooser();                jfc.setDialogTitle("请选择要保存的路径");                jfc.showSaveDialog(null);                jfc.setVisible(true);                File f = jfc.getSelectedFile();                if (f != null) {                    String savepath = f.getAbsolutePath();                    try {                        fw = new FileWriter(savepath);                        bfw = new BufferedWriter(fw);                        bfw.write(jta.getText());                        bfw.flush();                    } catch (Exception e) {                        e.printStackTrace();                    } finally {                        try {                            bfw.close();                            fw.close();                        } catch (IOException e) {                            e.printStackTrace();                        }                    }                }            } else if (arg0.getActionCommand().equals("查看帮助"))                JOptionPane.showMessageDialog(null, "请自行探索各项功能");            else if (arg0.getActionCommand().equals("退出"))                System.exit(0);        }    }}