mynotepad.java

Java记事本,类似于Windows附带的记事本

            return "JAVA类文件(*.class)";
        }
        return "";
    }
}

class Win extends WindowAdapter {
    public void windowClosing(WindowEvent e) {
        System.exit(0);
    }
}
//############################################字体设置类###################################
class SetFont extends JFrame implements ActionListener {
    /**
     * 模拟系统记事本的格式菜单下的字体设置菜单，并新增加了颜色设置功能
     */
// private static final long serialVersionUID = 1L;
    final JDialog fontDialog;
    final JTextField tfFont,  tfSize,  tfStyle;
    final int fontStyleConst[] = {Font.PLAIN, Font.BOLD, Font.ITALIC,
        Font.BOLD + Font.ITALIC
    };
    final JList listStyle,  listFont,  listSize;
    Color backgroundColor, fontColor;
    JLabel sample;
    Font newFont;
    JButton fontOkButton;
    JTextArea editArea;

//构造函数SetFont
    public SetFont(JTextArea tex) {
        fontDialog = new JDialog(this, "字体设置", true);
        Container con = fontDialog.getContentPane();
        con.setLayout(new BorderLayout());

        editArea = tex;
        backgroundColor = editArea.getBackground();
        fontColor = editArea.getForeground();

        JPanel topPanel = new JPanel(); //存放字体、字形、字号、颜色、预览面板的面板
        topPanel.setLayout(new GridLayout(2, 3));

        JPanel basePanel = new JPanel(); //存放确定和取消按钮的面板
        basePanel.setLayout(new FlowLayout());

        Font currentFont = editArea.getFont();//获取当前编辑文本的字体

        JPanel fontPanel = new JPanel(); //字体设置面板      
        JPanel stylePanel = new JPanel(); //字形设置面板    
        JPanel sizePanel = new JPanel(); //字号设置面板

        JPanel fontcolorPanel = new JPanel(); //字体颜色设置面板
        fontcolorPanel.setLayout(new BorderLayout());
        JPanel backgroundcolorPanel = new JPanel(); //背景颜色设置面板
        backgroundcolorPanel.setLayout(new BorderLayout());
        JPanel demoPanel = new JPanel(new BorderLayout()); //预览面板      

        final JLabel bgclabel = new JLabel("单击改变背景颜色");
        bgclabel.setOpaque(true); //设置透明
        bgclabel.setHorizontalAlignment(SwingConstants.CENTER); //设置文字剧中
        bgclabel.setBackground(Color.WHITE); //设置背景色为白色，此处为初始化的文本区背景色
        bgclabel.addMouseListener(new MouseListener() {

            public void mouseClicked(MouseEvent e) {
            // TODO Auto-generated method stub
            }

            public void mouseEntered(MouseEvent e) {
            // TODO Auto-generated method stub
            }

            public void mouseExited(MouseEvent e) {
            // TODO Auto-generated method stub
            }

            public void mousePressed(MouseEvent e) {
                // TODO Auto-generated method stub
                Color color = JColorChooser.showDialog(SetFont.this, "设置背景颜色", Color.BLACK);
                if (color != null) //若为null值表示用户按下Cancel按钮
                {
                    backgroundColor = color;
                    bgclabel.setBackground(backgroundColor);
                    sample.setBackground(backgroundColor);
                }
            }

            public void mouseReleased(MouseEvent e) {
            // TODO Auto-generated method stub
            }
        });

        final JLabel fclabel = new JLabel("单击改变字体颜色");
        fclabel.setHorizontalAlignment(SwingConstants.CENTER);
        fclabel.setOpaque(true);
        fclabel.setBackground(Color.BLACK); //此处为设置字体的颜色，初始化为黑色
        fclabel.addMouseListener(new MouseListener() {

            public void mouseClicked(MouseEvent e) {
            // TODO Auto-generated method stub
            }

            public void mouseEntered(MouseEvent e) {
            // TODO Auto-generated method stub
            }

            public void mouseExited(MouseEvent e) {
            // TODO Auto-generated method stub
            }

            public void mousePressed(MouseEvent e) {
                // TODO Auto-generated method stub
                Color color = JColorChooser.showDialog(SetFont.this, "设置字体颜色", Color.BLACK);
                if (color != null) //若为null值表示用户按下Cancel按钮
                {
                    fontColor = color;
                    fclabel.setBackground(fontColor);
                    sample.setForeground(fontColor);
                }
            }

            public void mouseReleased(MouseEvent e) {
            // TODO Auto-generated method stub
            }
        });

        JLabel lblFont = new JLabel("字体(F):");
        lblFont.setPreferredSize(new Dimension(80, 20));
        JLabel lblStyle = new JLabel("字形(Y):");
        lblStyle.setPreferredSize(new Dimension(80, 20));
        JLabel lblSize = new JLabel("大小(S):");
        lblSize.setPreferredSize(new Dimension(80, 20));
        tfFont = new JTextField(12);   //设置可显示的列数
        tfFont.setText(currentFont.getFontName());
        tfFont.selectAll();
        tfFont.setPreferredSize(new Dimension(20, 20));

        tfStyle = new JTextField(10);
        if (currentFont.getStyle() == Font.PLAIN) {
            tfStyle.setText("常规");
        } else if (currentFont.getStyle() == Font.BOLD) {
            tfStyle.setText("粗体");
        } else if (currentFont.getStyle() == Font.ITALIC) {
            tfStyle.setText("斜体");
        } else if (currentFont.getStyle() == (Font.BOLD + Font.ITALIC)) {
            tfStyle.setText("粗斜体");
        }

        tfFont.selectAll();
        tfStyle.setPreferredSize(new Dimension(20, 20));
        tfSize = new JTextField(8);
        tfSize.setText(currentFont.getSize() + "");
        tfSize.selectAll();
        tfSize.setPreferredSize(new Dimension(20, 20));

        final String fontStyle[] = {"常规", "粗体", "斜体", "粗斜体"};
        listStyle = new JList(fontStyle);

        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        final String fontName[] = ge.getAvailableFontFamilyNames(); //获取系统的本地字体
        int defaultFontIndex = 0;
        for (int i = 0; i < fontName.length; i++) {
            if (fontName[i].equals(currentFont.getFontName())) {
                defaultFontIndex = i;
                break;
            }
        }
        listFont = new JList(fontName);
        listFont.setSelectedIndex(defaultFontIndex);
        listFont.setSelectionMode(ListSelectionModel.SINGLE_SELECTION); //单选
        listFont.setVisibleRowCount(5);
        listFont.setFixedCellWidth(120);
        listFont.setFixedCellHeight(15);
        listFont.addListSelectionListener(new ListSelectionListener() {

            public void valueChanged(ListSelectionEvent event) {
                tfFont.setText(fontName[listFont.getSelectedIndex()]);
                tfFont.requestFocus();
                tfFont.selectAll();
                updateSample();
            }
        });

        listStyle.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        if (currentFont.getStyle() == Font.PLAIN) {
            listStyle.setSelectedIndex(0);
        } else if (currentFont.getStyle() == Font.BOLD) {
            listStyle.setSelectedIndex(1);
        } else if (currentFont.getStyle() == Font.ITALIC) {
            listStyle.setSelectedIndex(2);
        } else if (currentFont.getStyle() == (Font.BOLD + Font.ITALIC)) {
            listStyle.setSelectedIndex(3);
        }

        listStyle.setVisibleRowCount(5);
        listStyle.setFixedCellWidth(110);
        listStyle.setFixedCellHeight(15);
        listStyle.addListSelectionListener(new ListSelectionListener() {

            public void valueChanged(ListSelectionEvent event) {
                tfStyle.setText(fontStyle[listStyle.getSelectedIndex()]);
                tfStyle.requestFocus();
                tfStyle.selectAll();
                updateSample();
            }
        });

        final String fontSize[] = {"8", "9", "10", "12", "14", "15", "16", "18",
            "20", "21", "22", "24", "26", "28", "30", "36", "48", "54", "72", "89"
        };
        listSize = new JList(fontSize);
        int defaultFontSizeIndex = 0;
        for (int i = 0; i < fontSize.length; i++) {
            if (fontSize[i].equals(currentFont.getSize() + "")) {
                defaultFontSizeIndex = i;
                break;
            }
        }
        listSize.setSelectedIndex(defaultFontSizeIndex);

        listSize.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        listSize.setVisibleRowCount(5);
        listSize.setFixedCellWidth(70);
        listSize.setFixedCellHeight(15);
        listSize.addListSelectionListener(new ListSelectionListener() {

            public void valueChanged(ListSelectionEvent event) {
                tfSize.setText(fontSize[listSize.getSelectedIndex()]);
                tfSize.requestFocus();
                tfSize.selectAll();
                updateSample();
            }
        });
        fontOkButton = new JButton("确定");
        fontOkButton.addActionListener(this);
        JButton cancelButton = new JButton("取消");
        cancelButton.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {
                fontDialog.dispose();
            }
        });

        sample = new JLabel("Dave记事本");
        sample.setOpaque(true);
        sample.setHorizontalAlignment(SwingConstants.CENTER);
        sample.setBackground(Color.WHITE); //设置背景色
        sample.setForeground(Color.BLACK); //设置前景色，即字的颜色
//   sample.setPreferredSize(new Dimension(130, 100)); //设置文本域的大小
        demoPanel.setBorder(BorderFactory.createTitledBorder("预览")); //这是边框标题
        demoPanel.add(sample, BorderLayout.CENTER);

        fontPanel.add(lblFont);
        fontPanel.add(tfFont);
        fontPanel.add(new JScrollPane(listFont));

        stylePanel.add(lblStyle);
        stylePanel.add(tfStyle);
        stylePanel.add(new JScrollPane(listStyle));

        sizePanel.add(lblSize);
        sizePanel.add(tfSize);
        sizePanel.add(new JScrollPane(listSize));

        fontcolorPanel.setBorder(BorderFactory.createTitledBorder("字体颜色"));
        fontcolorPanel.add(fclabel, BorderLayout.CENTER);
        backgroundcolorPanel.setBorder(BorderFactory.createTitledBorder("背景颜色"));
        backgroundcolorPanel.add(bgclabel, BorderLayout.CENTER);

        basePanel.add(fontOkButton);
        basePanel.add(cancelButton);

        topPanel.add(fontPanel);
        topPanel.add(stylePanel);
        topPanel.add(sizePanel);
        topPanel.add(fontcolorPanel);
        topPanel.add(backgroundcolorPanel);
        topPanel.add(demoPanel);
        con.add(basePanel, BorderLayout.SOUTH);
        con.add(topPanel, BorderLayout.CENTER);
        updateSample();

        fontDialog.setSize(450, 340);
        fontDialog.setLocation(200, 200);
        fontDialog.setResizable(false);
        fontDialog.setVisible(true);
    }//构造函数结束

//设置文本编辑区的字体
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == fontOkButton) {
            newFont = new Font(tfFont.getText(), fontStyleConst[listStyle.getSelectedIndex()], Integer.parseInt(tfSize.getText()));
            fontDialog.dispose();
            editArea.setFont(newFont);
            editArea.setBackground(backgroundColor);
            editArea.setForeground(fontColor);

        }
    }//End method actionPerformed
    public Font getFont() {
        return newFont;
    }

    public Color getbackgroundColor() {
        return backgroundColor;
    }

    public Color getfontColor() {
        return fontColor;
    }

//更新示例显示的字体和风格大小等
    public void updateSample() {
        Font sampleFont = new Font(tfFont.getText(), fontStyleConst[listStyle.getSelectedIndex()], Integer.parseInt(tfSize.getText()));
        sample.setFont(sampleFont);
    }//End method updateSample
} //##########################################################End of class SetFont######################

public class MyNotepad {
    public static void main(String[] args) {
        try {
            UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
            Font font = new Font("Dialog", Font.PLAIN, 12); //一下是改变默认的组建上显示的字体，这样更加美观一些
            UIManager.put("MenuBar.font", font);
            UIManager.put("MenuItem.font", font);
            UIManager.put("Menu.font", font);
            UIManager.put("PopupMenu.font", font);
            UIManager.put("ToolBar.font", font);
            UIManager.put("ToolTip.font", font);
            UIManager.put("TabbedPane.font", font);
            UIManager.put("Label.font", font);
            UIManager.put("List.font", font);
            UIManager.put("ComboBox.font", font);
            UIManager.put("Button.font", font);
            UIManager.put("Table.font", font);
            UIManager.put("TableHeader.font", font);
            UIManager.put("Tree.font", font);
            UIManager.put("TextField.font", font);
            UIManager.put("TextArea.font", font);
            UIManager.put("TitledBorder.font", font);
            UIManager.put("OptionPane.font", font);
            UIManager.put("RadioButton.font", font);
            UIManager.put("CheckBox.font", font);
            UIManager.put("ToggleButton.font", font);
            UIManager.put("Dialog.font", font);
            UIManager.put("Panel.font", font);
        } catch (Exception e) {}
        DaveNotepad frm = new DaveNotepad();
        frm.addWindowListener(new Win());
    }
}