JEditorPane and the Swing HTML Package 8 : Text EditorPane « Swing JFC « Java

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Java » Swing JFC » Text EditorPane 




JEditorPane and the Swing HTML Package 8
JEditorPane and the Swing HTML Package 8
    
/*
Core SWING Advanced Programming 
By Kim Topley
ISBN: 0 13 083292 8       
Publisher: Prentice Hall  
*/

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.net.URL;

import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.ButtonGroup;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.text.DefaultStyledDocument;
import javax.swing.text.EditorKit;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.Style;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyleContext;

public class EditorPaneExample8 {
  public static void createDocumentStyles(StyleContext sc) {
    Style defaultStyle = sc.getStyle(StyleContext.DEFAULT_STYLE);

    // Create and add the main document style
    Style mainStyle = sc.addStyle(mainStyleName, defaultStyle);
    StyleConstants.setLeftIndent(mainStyle, 16);
    StyleConstants.setRightIndent(mainStyle, 16);
    StyleConstants.setFirstLineIndent(mainStyle, 16);
    StyleConstants.setFontFamily(mainStyle, "serif");
    StyleConstants.setFontSize(mainStyle, 12);

    // Create and add the constant width style
    Style cwStyle = sc.addStyle(charStyleName, null);
    StyleConstants.setFontFamily(cwStyle, "monospaced");
    StyleConstants.setForeground(cwStyle, Color.green);

    // Create and add the heading style
    Style heading2Style = sc.addStyle(heading2StyleName, null);
    StyleConstants.setForeground(heading2Style, Color.red);
    StyleConstants.setFontSize(heading2Style, 16);
    StyleConstants.setFontFamily(heading2Style, "serif");
    StyleConstants.setBold(heading2Style, true);
    StyleConstants.setLeftIndent(heading2Style, 8);
    StyleConstants.setFirstLineIndent(heading2Style, 0);

    // Create and add the Component style
    Class baseClass = EditorPaneExample8.class;
    URL url = baseClass.getResource("Java2s.gif");
    ImageIcon icon = new ImageIcon(url);
    JLabel comp = new JLabel("Displaying text with attributes", icon,
        JLabel.CENTER);
    comp.setVerticalTextPosition(JLabel.BOTTOM);
    comp.setHorizontalTextPosition(JLabel.CENTER);
    comp.setFont(new Font("serif", Font.BOLD | Font.ITALIC, 14));
    Style componentStyle = sc.addStyle(componentStyleName, null);
    StyleConstants.setComponent(componentStyle, comp);

    // The paragraph style for the component
    Style compParagraphStyle = sc.addStyle(compParaName, null);
    StyleConstants.setSpaceAbove(compParagraphStyle, (float16.0);
  }

  public static void addText(JTextPane pane, StyleContext sc,
      Style logicalStyle, Paragraph[] content) {
    // The outer loop adds paragraphs, while the
    // inner loop adds character runs.
    int paragraphs = content.length;
    for (int i = 0; i < paragraphs; i++) {
      Run[] runs = content[i].content;
      for (int j = 0; j < runs.length; j++) {
        pane.setCharacterAttributes(
            runs[j].styleName == null ? SimpleAttributeSet.EMPTY
                : sc.getStyle(runs[j].styleName)true);
        pane.replaceSelection(runs[j].content);
      }

      // At the end of the paragraph, add the logical style and
      // any overriding paragraph style and then terminate the
      // paragraph with a newline.
      pane.setParagraphAttributes(SimpleAttributeSet.EMPTY, true);

      if (logicalStyle != null) {
        pane.setLogicalStyle(logicalStyle);
      }

      if (content[i].styleName != null) {
        pane.setParagraphAttributes(sc.getStyle(content[i].styleName),
            false);
      }

      pane.replaceSelection("\n");
    }
  }

  public static void main(String[] args) {
    try {
        UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
    catch (Exception evt) {}
  
    JFrame f = new JFrame("Saving Data in Various Formats");

    // Create the StyleContext, the document and the pane
    final StyleContext sc = new StyleContext();
    final DefaultStyledDocument doc = new DefaultStyledDocument(sc);
    final JTextPane pane = new JTextPane(doc);

    // Build the styles
    createDocumentStyles(sc);

    try {
      // Add the text and apply the styles
      SwingUtilities.invokeAndWait(new Runnable() {
        public void run() {
          // Add the text
          addText(pane, sc, sc.getStyle(mainStyleName), content);
        }
      });
    catch (Exception e) {
      System.out.println("Exception when constructing document: " + e);
      System.exit(1);
    }

    JScrollPane scrollPane = new JScrollPane(pane);
    scrollPane.setPreferredSize(new Dimension(500250));
    f.getContentPane().add(scrollPane, "Center");

    JPanel panel = new JPanel();
    panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
    JButton button = new JButton("Save");
    final JCheckBox plain = new JCheckBox("Plain Text");
    final JCheckBox html new JCheckBox("HTML");
    final JCheckBox rtf = new JCheckBox("RTF");
    panel.add(plain);
    panel.add(html);
    panel.add(rtf);

    ButtonGroup group = new ButtonGroup();
    group.add(plain);
    group.add(html);
    group.add(rtf);
    plain.setSelected(true);

    panel.add(Box.createVerticalStrut(10));
    panel.add(button);
    panel.add(Box.createVerticalGlue());
    panel.setBorder(BorderFactory.createEmptyBorder(2424));
    button.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent evt) {
        Writer w = null;
        OutputStream os = System.out;
        String contentType;
        if (plain.isSelected()) {
          contentType = "text/plain";
          w = new OutputStreamWriter(os);
        else if (html.isSelected()) {
          contentType = "text/html";
          w = new OutputStreamWriter(os);
        else {
          contentType = "text/rtf";
        }

        EditorKit kit = pane.getEditorKitForContentType(contentType);
        try {
          if (w != null) {
            kit.write(w, pane.getDocument()0, pane.getDocument()
                .getLength());
            w.flush();
          else {
            kit.write(os, pane.getDocument()0, pane.getDocument()
                .getLength());
            os.flush();
          }
        catch (Exception e) {
          System.out.println("Write failed");
        }
      }
    });
    f.getContentPane().add(panel, "East");
    f.pack();
    f.setVisible(true);
  }

  // Style names
  public static final String mainStyleName = "MainStyle";

  public static final String heading2StyleName = "Heading2";

  public static final String charStyleName = "ConstantWidth";

  public static final String componentStyleName = "Component";

  public static final String compParaName = "CompPara";

  // Inner classes used to define paragraph structure
  public static class Run {
    public Run(String styleName, String content) {
      this.styleName = styleName;
      this.content = content;
    }

    public String styleName;

    public String content;
  }

  public static class Paragraph {
    public Paragraph(String styleName, Run[] content) {
      this.styleName = styleName;
      this.content = content;
    }

    public String styleName;

    public Run[] content;
  }

  public static final Paragraph[] content = new Paragraph[] {
      new Paragraph(heading2StyleName, new Run[] { new Run(null,
          "Attributes, Styles and Style Contexts") }),
      new Paragraph(
          null,
          new Run[] {
              new Run(null, "The simple "),
              new Run(charStyleName, "PlainDocument"),
              new Run(
                  null,
                  " class that you saw in the previous "
                      "chapter is only capable of holding text. "
                      "The more complex text components use a more "
                      "sophisticated model that implements the "),
              new Run(charStyleName, "StyledDocument"),
              new Run(null, " interface. "),
              new Run(charStyleName, "StyledDocument"),
              new Run(null, " is a sub-interface of "),
              new Run(charStyleName, "Document"),
              new Run(
                  null,
                  " that contains methods for manipulating attributes "
                      "that control the way in which the text in the "
                      "document is displayed. The Swing text package "
                      "contains a concrete implementation of "),
              new Run(charStyleName, "StyledDocument"),
              new Run(null, " called "),
              new Run(charStyleName, "DefaultStyledDocument"),
              new Run(null,
                  " that is used as the default model for "),
              new Run(charStyleName, "JTextPane"),
              new Run(
                  null,
                  " and is also the base class from which "
                      "more specific models, such as the "),
              new Run(charStyleName, "HTMLDocument"),
              new Run(
                  null,
                  " class that handles input in HTML format, can be "
                      "created. In order to make use of "),
              new Run(charStyleName, "DefaultStyledDocument"),
              new Run(null, " and "),
              new Run(charStyleName, "JTextPane"),
              new Run(null,
                  " you need to understand how Swing represents "
                      "and uses attributes.") }),
      new Paragraph(compParaName, new Run[] { new Run(componentStyleName,
          " ") }) };
}


           
         
    
    
    
  














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