Java Swing写的字体选择器，仿记事本中的字体控件

Java Swing 写的字体选择器，仿记事本中的字体控件，使用操作方法与文件选择器JFileChooser基本相同。

 

 

package net.miqiang.gui; import java.awt.BorderLayout; import java.awt.Color; import java.awt.Dimension; import java.awt.Font; import java.awt.GraphicsEnvironment; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.FocusEvent; import java.awt.event.FocusListener; import javax.swing.BorderFactory; import javax.swing.Box; import javax.swing.ButtonGroup; import javax.swing.JButton; import javax.swing.JDialog; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JList; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JRadioButton; import javax.swing.JScrollPane; import javax.swing.JTextField; import javax.swing.event.ListSelectionEvent; import javax.swing.event.ListSelectionListener; import javax.swing.text.AttributeSet; import javax.swing.text.BadLocationException; import javax.swing.text.Document; import javax.swing.text.PlainDocument; /** * 字体选择器，仿记事本中的字体控件，使用操作方法与文件选择器JFileChooser基本相同。 * @author 米强<转载请注明作者与来源> * @blog http://blog.csdn.net/mq612 * @blog http://hi.baidu.com/mq612/blog * */ @SuppressWarnings("serial") public class MQFontChooser extends JDialog { /** * 选择取消按钮的返回值 */ public static final int CANCEL_OPTION = 0; /** * 选择确定按钮的返回值 */ public static final int APPROVE_OPTION = 1; /** * 中文预览的字符串 */ private static final String CHINA_STRING = "神马都是浮云！"; /** * 英文预览的字符串 */ private static final String ENGLISH_STRING = "Hello Kitty！"; /** * 数字预览的字符串 */ private static final String NUMBER_STRING = "0123456789"; // 预设字体，也是将来要返回的字体 private Font font = null; // 字体选择器组件容器 private Box box = null; // 字体文本框 private JTextField fontText = null; // 样式文本框 private JTextField styleText = null; // 文字大小文本框 private JTextField sizeText = null; // 预览文本框 private JTextField previewText = null; // 中文预览 private JRadioButton chinaButton = null; // 英文预览 private JRadioButton englishButton = null; // 数字预览 private JRadioButton numberButton = null; // 字体选择框 private JList fontList = null; // 样式选择器 private JList styleList = null; // 文字大小选择器 private JList sizeList = null; // 确定按钮 private JButton approveButton = null; // 取消按钮 private JButton cancelButton = null; // 所有字体 private String [] fontArray = null; // 所有样式 private String [] styleArray = {"常规", "粗体", "斜体", "粗斜体"}; // 所有预设字体大小 private String [] sizeArray = {"8", "9", "10", "11", "12", "14", "16", "18", "20", "22", "24", "26", "28", "36", "48", "初号", "小初", "一号", "小一", "二号", "小二", "三号", "小三", "四号", "小四", "五号", "小五", "六号", "小六", "七号", "八号"}; // 上面数组中对应的字体大小 private int [] sizeIntArray = {8, 9, 10, 11, 12, 14, 16, 18, 20, 22, 24, 26, 28, 36, 48, 42, 36, 26, 24, 22, 18, 16, 15, 14, 12, 10, 9, 8, 7, 6, 5}; // 返回的数值，默认取消 private int returnValue = CANCEL_OPTION; /** * 体构造一个字体选择器 */ public MQFontChooser() { this(new Font("宋体", Font.PLAIN, 12)); } /** * 使用给定的预设字体构造一个字体选择器 * @param font 字体 */ public MQFontChooser(Font font) { setTitle("字体选择器"); this.font = font; // 初始化UI组件 init(); // 添加监听器 addListener(); // 按照预设字体显示 setup(); // 基本设置 setModal(true); setResizable(false); // 自适应大小 pack(); } /** * 初始化组件 */ private void init(){ // 获得系统字体 GraphicsEnvironment eq = GraphicsEnvironment.getLocalGraphicsEnvironment(); fontArray = eq.getAvailableFontFamilyNames(); // 主容器 box = Box.createVerticalBox(); box.setBorder(BorderFactory.createEmptyBorder(8, 8, 8, 8)); fontText = new JTextField(); fontText.setEditable(false); fontText.setBackground(Color.WHITE); styleText = new JTextField(); styleText.setEditable(false); styleText.setBackground(Color.WHITE); sizeText = new JTextField("12"); // 给文字大小文本框使用的Document文档，制定了一些输入字符的规则 Document doc = new PlainDocument(){ public void insertString(int offs, String str, AttributeSet a) throws BadLocationException { if (str == null) { return; } if (getLength() >= 3) { return; } if (!str.matches("[0-9]+") && !str.equals("初号") && !str.equals("小初") && !str.equals("一号") && !str.equals("小一") && !str.equals("二号") && !str.equals("小二") && !str.equals("三号") && !str.equals("小三") && !str.equals("四号") && !str.equals("小四") && !str.equals("五号") && !str.equals("小五") && !str.equals("六号") && !str.equals("小六") && !str.equals("七号") && !str.equals("八号")) { return; } super.insertString(offs, str, a); sizeList.setSelectedValue(sizeText.getText(), true); } }; sizeText.setDocument(doc); previewText = new JTextField(20); previewText.setHorizontalAlignment(JTextField.CENTER); previewText.setEditable(false); previewText.setBackground(Color.WHITE); chinaButton = new JRadioButton("中文预览", true); englishButton = new JRadioButton("英文预览"); numberButton = new JRadioButton("数字预览"); ButtonGroup bg = new ButtonGroup(); bg.add(chinaButton); bg.add(englishButton); bg.add(numberButton); fontList = new JList(fontArray); styleList = new JList(styleArray); sizeList = new JList(sizeArray); approveButton = new JButton("确定"); cancelButton = new JButton("取消"); Box box1 = Box.createHorizontalBox(); JLabel l1 = new JLabel("字体:"); JLabel l2 = new JLabel("字形:"); JLabel l3 = new JLabel("大小:"); l1.setPreferredSize(new Dimension(165, 14)); l1.setMaximumSize(new Dimension(165, 14)); l1.setMinimumSize(new Dimension(165, 14)); l2.setPreferredSize(new Dimension(95, 14)); l2.setMaximumSize(new Dimension(95, 14)); l2.setMinimumSize(new Dimension(95, 14)); l3.setPreferredSize(new Dimension(80, 14)); l3.setMaximumSize(new Dimension(80, 14)); l3.setMinimumSize(new Dimension(80, 14)); box1.add(l1); box1.add(l2); box1.add(l3); Box box2 = Box.createHorizontalBox(); fontText.setPreferredSize(new Dimension(160, 20)); fontText.setMaximumSize(new Dimension(160, 20)); fontText.setMinimumSize(new Dimension(160, 20)); box2.add(fontText); box2.add(Box.createHorizontalStrut(5)); styleText.setPreferredSize(new Dimension(90, 20)); styleText.setMaximumSize(new Dimension(90, 20)); styleText.setMinimumSize(new Dimension(90, 20)); box2.add(styleText); box2.add(Box.createHorizontalStrut(5)); sizeText.setPreferredSize(new Dimension(80, 20)); sizeText.setMaximumSize(new Dimension(80, 20)); sizeText.setMinimumSize(new Dimension(80, 20)); box2.add(sizeText); Box box3 = Box.createHorizontalBox(); JScrollPane sp1 = new JScrollPane(fontList); sp1.setPreferredSize(new Dimension(160, 100)); sp1.setMaximumSize(new Dimension(160, 100)); sp1.setMaximumSize(new Dimension(160, 100)); box3.add(sp1); box3.add(Box.createHorizontalStrut(5)); JScrollPane sp2 = new JScrollPane(styleList); sp2.setPreferredSize(new Dimension(90, 100)); sp2.setMaximumSize(new Dimension(90, 100)); sp2.setMinimumSize(new Dimension(90, 100)); box3.add(sp2); box3.add(Box.createHorizontalStrut(5)); JScrollPane sp3 = new JScrollPane(sizeList); sp3.setPreferredSize(new Dimension(80, 100)); sp3.setMaximumSize(new Dimension(80, 100)); sp3.setMinimumSize(new Dimension(80, 100)); box3.add(sp3); Box box4 = Box.createHorizontalBox(); Box box5 = Box.createVerticalBox(); JPanel box6 = new JPanel(new BorderLayout()); box5.setBorder(BorderFactory.createTitledBorder("字符集")); box6.setBorder(BorderFactory.createTitledBorder("示例")); box5.add(chinaButton); box5.add(englishButton); box5.add(numberButton); box5.setPreferredSize(new Dimension(90, 95)); box5.setMaximumSize(new Dimension(90, 95)); box5.setMinimumSize(new Dimension(90, 95)); box6.add(previewText); box6.setPreferredSize(new Dimension(250, 95)); box6.setMaximumSize(new Dimension(250, 95)); box6.setMinimumSize(new Dimension(250, 95)); box4.add(box5); box4.add(Box.createHorizontalStrut(4)); box4.add(box6); Box box7 = Box.createHorizontalBox(); box7.add(Box.createHorizontalGlue()); box7.add(approveButton); box7.add(Box.createHorizontalStrut(5)); box7.add(cancelButton); box.add(box1); box.add(box2); box.add(box3); box.add(Box.createVerticalStrut(5)); box.add(box4); box.add(Box.createVerticalStrut(5)); box.add(box7); getContentPane().add(box); } /** * 按照预设字体显示 */ private void setup() { String fontName = font.getFamily(); int fontStyle = font.getStyle(); int fontSize = font.getSize(); /* * 如果预设的文字大小在选择列表中，则通过选择该列表中的某项进行设值，否则直接将预设文字大小写入文本框 */ boolean b = false; for (int i = 0; i < sizeArray.length; i++) { if (sizeArray[i].equals(String.valueOf(fontSize))) { b = true; break; } } if(b){ // 选择文字大小列表中的某项 sizeList.setSelectedValue(String.valueOf(fontSize), true); }else{ sizeText.setText(String.valueOf(fontSize)); } // 选择字体列表中的某项 fontList.setSelectedValue(fontName, true); // 选择样式列表中的某项 styleList.setSelectedIndex(fontStyle); // 预览默认显示中文字符 chinaButton.doClick(); // 显示预览 setPreview(); } /** * 添加所需的事件监听器 */ private void addListener() { sizeText.addFocusListener(new FocusListener() { public void focusLost(FocusEvent e) { setPreview(); } public void focusGained(FocusEvent e) { sizeText.selectAll(); } }); // 字体列表发生选择事件的监听器 fontList.addListSelectionListener(new ListSelectionListener() { public void valueChanged(ListSelectionEvent e) { if (!e.getValueIsAdjusting()) { fontText.setText(String.valueOf(fontList.getSelectedValue())); // 设置预览 setPreview(); } } }); styleList.addListSelectionListener(new ListSelectionListener() { public void valueChanged(ListSelectionEvent e) { if (!e.getValueIsAdjusting()) { styleText.setText(String.valueOf(styleList.getSelectedValue())); // 设置预览 setPreview(); } } }); sizeList.addListSelectionListener(new ListSelectionListener() { public void valueChanged(ListSelectionEvent e) { if (!e.getValueIsAdjusting()) { if(!sizeText.isFocusOwner()){ sizeText.setText(String.valueOf(sizeList.getSelectedValue())); } // 设置预览 setPreview(); } } }); // 编码监听器 EncodeAction ea = new EncodeAction(); chinaButton.addActionListener(ea); englishButton.addActionListener(ea); numberButton.addActionListener(ea); // 确定按钮的事件监听 approveButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { // 组合字体 font = groupFont(); // 设置返回值 returnValue = APPROVE_OPTION; // 关闭窗口 disposeDialog(); } }); // 取消按钮事件监听 cancelButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { disposeDialog(); } }); } /** * 显示字体选择器 * @param owner 上层所有者 * @return 该整形返回值表示用户点击了字体选择器的确定按钮或取消按钮，参考本类常量字段APPROVE_OPTION和CANCEL_OPTION */ public final int showFontDialog(JFrame owner) { setLocationRelativeTo(owner); setVisible(true); return returnValue; } /** * 返回选择的字体对象 * @return 字体对象 */ public final Font getSelectFont() { return font; } /** * 关闭窗口 */ private void disposeDialog() { MQFontChooser.this.removeAll(); MQFontChooser.this.dispose(); } /** * 显示错误消息 * @param errorMessage 错误消息 */ private void showErrorDialog(String errorMessage) { JOptionPane.showMessageDialog(this, errorMessage, "错误", JOptionPane.ERROR_MESSAGE); } /** * 设置预览 */ private void setPreview() { Font f = groupFont(); previewText.setFont(f); } /** * 按照选择组合字体 * @return 字体 */ private Font groupFont() { String fontName = fontText.getText(); int fontStyle = styleList.getSelectedIndex(); String sizeStr = sizeText.getText().trim(); // 如果没有输入 if(sizeStr.length() == 0) { showErrorDialog("字体（大小）必须是有效“数值！"); return null; } int fontSize = 0; // 通过循环对比文字大小输入是否在现有列表内 for (int i = 0; i < sizeArray.length; i++) { if(sizeStr.equals(sizeArray[i])){ fontSize = sizeIntArray[i]; break; } } // 没有在列表内 if (fontSize == 0) { try{ fontSize = Integer.parseInt(sizeStr); if(fontSize < 1){ showErrorDialog("字体（大小）必须是有效“数值”！"); return null; } }catch (NumberFormatException nfe) { showErrorDialog("字体（大小）必须是有效“数值”！"); return null; } } return new Font(fontName, fontStyle, fontSize); } /** * 编码选择事件的监听动作 * @author 米强 * */ class EncodeAction implements ActionListener { public void actionPerformed(ActionEvent e) { if (e.getSource().equals(chinaButton)) { previewText.setText(CHINA_STRING); } else if (e.getSource().equals(englishButton)) { previewText.setText(ENGLISH_STRING); } else { previewText.setText(NUMBER_STRING); } } } }

 

下面是一个测试类，需要单独建一个TestMain.java文件

package net.miqiang.gui; import java.awt.BorderLayout; import java.awt.Font; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTextArea; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException; /** * 字体选择器测试类 * @author 米强 * */ public class TestMain extends JFrame { private JTextArea text = null; private JButton button = null; static { try { // 请配合Look And Feel使用本组件，可得到更好的效果 UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException e) { e.printStackTrace(); } catch (InstantiationException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } catch (UnsupportedLookAndFeelException e) { e.printStackTrace(); } } public TestMain() { text = new JTextArea("五星红旗迎风飘扬，/n胜利歌声多么响亮；/n歌唱我们亲爱的祖国，/n从今走向繁荣富强。/n歌唱我们亲爱的祖国，/n从今走向繁荣富强。/n/n越过高山，/n越过平原，/n跨过奔腾的黄河长江；/n宽广美丽的土地，/n是我们亲爱的家乡，/n英雄的人民站起来了！/n我们团结友爱坚强如钢。"); System.out.println(text.getFont()); button = new JButton("设置字体"); // 给按钮添加动作事件监听 button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { // 构造字体选择器，参数字体为预设值 MQFontChooser fontChooser = new MQFontChooser(text.getFont()); // 打开一个字体选择器窗口，参数为父级所有者窗体。返回一个整型，代表设置字体时按下了确定或是取消，可参考MQFontChooser.APPROVE_OPTION和MQFontChooser.CANCEL_OPTION int returnValue = fontChooser.showFontDialog(TestMain.this); // 如果按下的是确定按钮 if (returnValue == MQFontChooser.APPROVE_OPTION) { // 获取选择的字体 Font font = fontChooser.getSelectFont(); // 将字体设置到JTextArea中 text.setFont(font); } } }); getContentPane().add(new JScrollPane(text)); getContentPane().add(button, BorderLayout.SOUTH); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setSize(500, 300); setLocationRelativeTo(null); setVisible(true); } public static void main(String[] args) { new TestMain(); } }