s23.htm

Java2Swingt界面设计

              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> 23.4 视图</p>
            <p>&nbsp;</p>
            <p align="center"><b>例23-3 实现一个定制视图</b></p>
            <hr noshade size="1">
            import javax.swing.*;<br>
            import javax.swing.event.*;<br>
            import javax.swing.text.*;<br>
            import java.awt.*;<br>
            import java.awt.event.*;<br>
            import java.util.*;
            <p>public class Test extends JFrame {<br>
              JEditorPane editorPane = new JEditorPane();<br>
              Vector positions = new Vector();<br>
              Position.Bias bias = Position.Bias.Forward;</p>
            <p> class CustomView extends WrappedPlainView {<br>
              public CustomView(Element elem) {<br>
              super(elem);<br>
              }<br>
              public void paint(Graphics g, Shape a) {<br>
              super.paint(g,a);</p>
            <p> Enumeration e = positions.elements();<br>
              Position p;</p>
            <p> while(e.hasMoreElements()) {<br>
              try {<br>
              p = (Position)e.nextElement();<br>
              int offset = p.getOffset();</p>
            <p> Shape s = modelToView(p.getOffset(), a, bias);<br>
              Rectangle r = s.getBounds();</p>
            <p> // black border<br>
              g.setColor(Color.black);<br>
              g.drawRect(r.x, r.y, 6, 6);</p>
            <p> // red fill<br>
              g.setColor(Color.red);<br>
              g.fillRect(r.x+1, r.y+1, 5, 5);<br>
              }<br>
              catch(BadLocationException ex) {<br>
              ex.printStackTrace();<br>
              }<br>
              }<br>
              }<br>
              };<br>
              class CustomEditorKit extends DefaultEditorKit <br>
              implements ViewFactory {<br>
              public ViewFactory getViewFactory() {<br>
              return this;<br>
              }<br>
              public View create(Element elem) {<br>
              return new CustomView(elem);<br>
              }<br>
              };<br>
              public Test() {<br>
              JPanel panel = new JPanel();<br>
              JButton button = new JButton(&quot;Insert Position&quot;);<br>
              Container contentPane = getContentPane(); <br>
              panel.add(button);</p>
            <p> editorPane.setEditorKit(new CustomEditorKit());<br>
              editorPane.setFont(new Font(&quot;Serif&quot;, Font.ITALIC, 36));</p>
            <p> contentPane.add(panel, BorderLayout.NORTH);<br>
              contentPane.add(editorPane, BorderLayout.CENTER);</p>
            <p> button.addActionListener(new ActionListener() {<br>
              public void actionPerformed(ActionEvent e) {<br>
              try {<br>
              Document doc = editorPane.getDocument();<br>
              int p = editorPane.getCaretPosition();</p>
            <p> positions.addElement(doc.createPosition(p));<br>
              editorPane.repaint();<br>
              }<br>
              catch(BadLocationException ex) {<br>
              ex.printStackTrace();<br>
              }<br>
              }<br>
              });<br>
              }<br>
              public static void main(String args[]) {<br>
              GJApp.launch(new Test(), <br>
              &quot;Custom Text Views&quot;,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(&quot; &quot;);</p>
            <p> 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>
              }</p>
            <hr size="1" noshade>
            <p> 23.5 风格和风格的相关内容</p>
            <p>&nbsp;</p>
            <p align="center"><b>例23-4 使用风格的相关内容</b> </p>
            <hr noshade size="1">
            import java.io.File;<br>
            import javax.swing.*;<br>
            import javax.swing.text.*;<br>
            import javax.swing.event.*;<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 Hashtable actionTable = new Hashtable();<br>
              private JCheckBoxMenuItem titleItem, bodyItem; </p>
            <p> public Test() {<br>
              Container contentPane = getContentPane();</p>
            <p> textPane.setEditorKit(new ChapterEditorKit());<br>
              textPane.setFont(new Font(&quot;Dialog&quot;, Font.PLAIN, 18));</p>
            <p> // must load action table after setting editor kit ...<br>
              loadActionTable();</p>
            <p> readFile(&quot;text.txt&quot;);</p>
            <p> contentPane.add(new JScrollPane(textPane), <br>
              BorderLayout.CENTER);<br>
              contentPane.add(GJApp.getStatusArea(),BorderLayout.SOUTH);</p>
            <p> setJMenuBar(createMenuBar());<br>
              }<br>
              private JMenuBar createMenuBar() {<br>
              JMenuBar menuBar = new JMenuBar();<br>
              JMenu editMenu = new JMenu(&quot;Edit&quot;),<br>
              styleMenu = new JMenu(&quot;Paragraph Styles&quot;);</p>
            <p> styleMenu.add(getAction(ChapterStyleContext.titleStyle));<br>
              styleMenu.add(getAction(ChapterStyleContext.bodyStyle));</p>
            <p> editMenu.add(styleMenu);<br>
              menuBar.add(editMenu);<br>
              return menuBar;<br>
              }<br>
              private void readFile(String filename) {<br>
              EditorKit kit = textPane.getEditorKit();<br>
              Document doc = textPane.getDocument();</p>
            <p> try {<br>
              kit.read(new FileReader(filename), doc, 0);<br>
              }<br>
              catch(Exception ex) {<br>
              ex.printStackTrace();<br>
              }<br>
              }<br>
              private void loadActionTable() {<br>
              Action[] actions = textPane.getActions();</p>
            <p> for(int i=0; i &lt; actions.length; ++i) {<br>
              actionTable.put(actions[i].getValue(Action.NAME),<br>
              actions[i]);<br>
              }<br>
              }<br>
              private Action getAction(String name) {<br>
              return (Action)actionTable.get(name);<br>
              }<br>
              public static void main(String args[]) {<br>
              GJApp.launch(new Test(), <br>
              &quot;Custom EditorKits &amp; Style Contexts&quot;,<br>
              300,300,650,275);<br>
              }<br>
              }<br>
              class ChapterEditorKit extends StyledEditorKit {<br>
              private CaretListener caretListener = new Listener();<br>
              private static ChapterStyleContext context = <br>
              new ChapterStyleContext();</p>
            <p> private static Action[] defaultActions = new Action[] {<br>
              new ParagraphStyleAction(<br>
              ChapterStyleContext.titleStyle,<br>
              context.getStyle(ChapterStyleContext.titleStyle)),<br>
              new ParagraphStyleAction(<br>
              ChapterStyleContext.bodyStyle,<br>
              context.getStyle(ChapterStyleContext.bodyStyle)),<br>
              };<br>
              public Action[] getActions() {<br>
              return TextAction.augmentList(super.getActions(), <br>
              defaultActions);<br>
              }<br>
              public void install(JEditorPane editorPane) {<br>
              editorPane.addCaretListener(caretListener);<br>
              }<br>
              public void deinstall(JEditorPane editorPane) {<br>
              editorPane.removeCaretListener(caretListener);<br>
              }<br>
              static class Listener implements CaretListener {<br>
              public void caretUpdate(CaretEvent e) {<br>
              int dot = e.getDot(), mark = e.getMark();</p>
            <p> if (dot == mark) {<br>
              JTextComponent c = (JTextComponent) e.getSource();<br>
              StyledDocument document = <br>
              (StyledDocument) c.getDocument(); <br>