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();

}

}