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<SCRIPT LANGUAGE="JavaScript" SRC="/-fs0/sys/pop-up.js"></SCRIPT><SCRIPT LANGUAGE="JavaScript" SRC="/-fs0/sys/pop-up-all.js"></SCRIPT><html><head><title>易都网--Java 2 图形设计卷Ⅱ：SWING</title><LINK rel="stylesheet" href="../../../_public/javaa.css"><meta http-equiv="Content-Type" content="text/html; charset=GBK"><script language="JavaScript" src="../../../_public/javaa.js"></script><meta name="keywords" content="Java,JSP,ASP,PHP,J2EE,EJB,JavaScript,C/C++,ASM,CSS,HTML,XML,网络安全,MySQL,ACCESS"></head><body bgcolor="#FFFFFF"><table border=0 cellpadding=0 cellspacing=0 width="100%"> <tbody> <script language="javascript">print2()</script> <tr> <td width="100%"> <table bgcolor=#EEEEEE border=0 cellpadding=3 cellspacing=0 width="100%"> <tbody> <tr> <td class=f1 id=thetd width="100%"> <p>[<a href="index.html" target="_self">目录</a>][<a href="s22.htm">上一页</a>][下一页]</p> <p align="center"><b>第23章 定制文本组件</b></p> <p align="left"> Swing文本建立在由javax.swing.text包的类和接口提供的一个复杂的下层构件之上。一般使用Swing文本组件(在前两章中介绍)不要求对Swing文本包有很深的了解。但如果要定制文本组件，则要对javax.swing.text包有一个基本的掌握。本章提供了定制通用任务的例子。如彩色文本、设置字符和段落属性、实现定制视图等。</p> <p> <b>23.1 概览</b></p> <p> 与其他Swing组件一样，文本组件由一个模型(Document接口的一个实现)和一个UI代表（javax.swing.plaf.basic.BasicTextUI类的一个扩展）组成。文本组件还使用一个编辑器工具包(EditorKit类的一个扩展）和一个视图(View类的一个扩展)。图23-1示出了一个类图，这个类图说明了Swing文本域、这个域模型、UI代表、编辑器工具包和视图之间的静态关系(注：23.4节“视图”讨论了视图，所有的文本组件都有一个或多个视图)。其他的Swing文本组件有类似的类图。</p> <p> <b>23.2 属性集和风格常量</b></p> <p align="center"><b>例23-1 使用属性集</b> </p> <hr noshade size="1"> import java.awt.*;<br> import java.awt.event.*;<br> import javax.swing.*;<br> import javax.swing.text.*;<br> import java.util.*;<br> import java.io.FileReader; <p>public class Test extends JFrame {<br> private JTextPane textPane = new JTextPane();<br> private StyledDocument document = <br> (StyledDocument)textPane.getDocument();</p> <p> public Test() {<br> Container contentPane = getContentPane();<br> readFile("text.txt");<br> setAttributes();</p> <p> textPane.setFont(new Font("Dialog", Font.PLAIN, 18));<br> contentPane.add(new JScrollPane(textPane), <br> BorderLayout.CENTER);<br> }<br> private void setAttributes() {<br> SimpleAttributeSet attributes = new SimpleAttributeSet();</p> <p> StyleConstants.setForeground(attributes, Color.blue);<br> StyleConstants.setUnderline(attributes, true);</p> <p> document.setCharacterAttributes(5,9,attributes,false);</p> <p> StyleConstants.setForeground(attributes, Color.red);<br> StyleConstants.setStrikeThrough(attributes, false);</p> <p> document.setCharacterAttributes(15,9,attributes,true);<br> }<br> private void readFile(String filename) {<br> EditorKit kit = textPane.getEditorKit();<br> try {<br> kit.read(new FileReader(filename), document, 0);<br> }<br> catch(Exception ex) {<br> ex.printStackTrace();<br> }<br> }<br> public static void main(String args[]) {<br> GJApp.launch(new Test(), <br> "Setting Attributes",300,300,450,300);<br> }<br> }<br> class GJApp extends WindowAdapter {<br> static private JPanel statusArea = new JPanel();<br> static private JLabel status = new JLabel(" ");<br> static private ResourceBundle resources;</p> <p> static {<br> resources = ResourceBundle.getBundle(<br> "GJApp", Locale.getDefault());<br> };</p> <p> private GJApp() {}<br> <br> public static void launch(final JFrame f, String title,<br> final int x, final int y, <br> final int w, int h) {<br> f.setTitle(title);<br> f.setBounds(x,y,w,h);<br> f.setVisible(true);</p> <p> statusArea.setBorder(BorderFactory.createEtchedBorder());<br> statusArea.setLayout(new FlowLayout(FlowLayout.LEFT,0,0));<br> statusArea.add(status);<br> status.setHorizontalAlignment(JLabel.LEFT);</p> <p> f.setDefaultCloseOperation(<br> WindowConstants.DISPOSE_ON_CLOSE);</p> <p> f.addWindowListener(new WindowAdapter() {<br> public void windowClosed(WindowEvent e) {<br> System.exit(0);<br> }<br> });<br> }<br> static public JPanel getStatusArea() {<br> return statusArea;<br> }<br> static public void showStatus(String s) {<br> status.setText(s);<br> }<br> static Object getResource(String key) {<br> if(resources != null) {<br> return resources.getString(key);<br> }<br> return null;<br> }<br> }</p> <hr size="1" noshade> <p> </p> <p> 23.3 定制动作</p> <p> </p> <p align="center"><b>例23-2 实现定制动作</b></p> <hr noshade size="1"> import java.io.File;<br> import javax.swing.*;<br> import javax.swing.text.*;<br> import java.awt.*;<br> import java.awt.event.*;<br> import java.util.*;<br> import java.io.FileReader; <p>public class Test extends JFrame {<br> private JTextPane textPane = new JTextPane();<br> private StyledDocument document = <br> (StyledDocument)textPane.getDocument();<br> private StyledEditorKit kit = <br> (StyledEditorKit)textPane.getEditorKit();<br> private JColorChooser chooser = new JColorChooser();<br> private int CharacterMode = 0, ParagraphMode = 1;</p> <p> public Test() {<br> Container contentPane = getContentPane();<br> readFile("text.txt");</p> <p> textPane.setFont(new Font("Dialog", Font.PLAIN, 18));</p> <p> contentPane.add(new JScrollPane(textPane), <br> BorderLayout.CENTER);</p> <p> setJMenuBar(createMenuBar());<br> }<br> private JMenuBar createMenuBar() {<br> JMenuBar menuBar = new JMenuBar();<br> JMenu editMenu = new JMenu("Edit");</p> <p> editMenu.add(new ForegroundFromChooserAction(<br> "Character Foreground Color ... ",<br> CharacterMode));</p> <p> editMenu.add(new ForegroundFromChooserAction(<br> "Paragraph Foreground Color ... ",<br> ParagraphMode));</p> <p> menuBar.add(editMenu);<br> return menuBar;<br> }<br> private void readFile(String filename) {<br> try {<br> kit.read(new FileReader(filename), document, 0);<br> }<br> catch(Exception ex) {<br> ex.printStackTrace();<br> }<br> }<br> public static void main(String args[]) {<br> GJApp.launch(new Test(), <br> "Custom Actions",300,300,650,275);<br> }<br> class ForegroundFromChooserAction <br> extends StyledEditorKit.StyledTextAction {</p> <p> protected Color fg;<br> protected JColorChooser chooser = new JColorChooser();<br> protected int mode;</p> <p> public ForegroundFromChooserAction(String nm, int mode) {<br> super(nm);<br> this.mode = mode;<br> }<br> public void actionPerformed(ActionEvent e) {<br> JEditorPane editor = getEditor(e);<br> if (editor != null) {<br> AttributeSet attributes = <br> textPane.getCharacterAttributes();<br> Color c = <br> StyleConstants.getForeground(attributes);</p> <p> Color fg = chooser.showDialog(Test.this,<br> "Choose Color for Text",<br> c == null ? Color.black : c);<br> /*<br> if ((e != null) && (e.getSource() == editor)) {<br> String s = e.getActionCommand();<br> try {<br> fg = Color.decode(s);<br> } <br> catch(NumberFormatException ex) {<br> ex.printStackTrace();<br> }<br> }<br> */<br> if (fg != null) {<br> MutableAttributeSet attr = <br> new SimpleAttributeSet();<br> StyleConstants.setForeground(attr, fg);</p> <p> if(mode == CharacterMode)<br> setCharacterAttributes(editor, attr, false);<br> else<br> setParagraphAttributes(editor, attr, false);</p> <p> textPane.setCaretPosition(<br> textPane.getSelectionStart());<br> } else {<br> Toolkit.getDefaultToolkit().beep();<br> }<br> }<br> }<br> }<br> }<br> class GJApp extends WindowAdapter {<br> static private JPanel statusArea = new JPanel();<br> static private JLabel status = new JLabel(" ");<br> static private ResourceBundle resources;</p> <p> static {<br> resources = ResourceBundle.getBundle(<br> "GJApp", Locale.getDefault());<br> };</p> <p> private GJApp() {}<br> <br> public static void launch(final JFrame f, String title,<br> final int x, final int y, <br> final int w, int h) {<br> f.setTitle(title);<br> f.setBounds(x,y,w,h);<br>⌨️ 快捷键说明
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