TextPane Views 2 : TextPane « Swing JFC « Java

TextPane Views 2

TextPane Views 2
Core SWING Advanced Programming 
By Kim Topley
ISBN: 0 13 083292 8       
Publisher: Prentice Hall  

import java.awt.Color;
import java.awt.Font;
import java.io.PrintStream;
import java.net.URL;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultStyledDocument;
import javax.swing.text.Document;
import javax.swing.text.JTextComponent;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.Style;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyleContext;
import javax.swing.text.View;

public class TextPaneViews {
  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 thisClass = TextPaneViews.class;
    URL url = thisClass.getResource("java2s.gif");
    ImageIcon icon = new ImageIcon(url);
    JLabel comp = new JLabel("Displaying text with attributes", icon,
    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, (float) 16.0);

  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++) {
            runs[j].styleName == null ? SimpleAttributeSet.EMPTY
                : sc.getStyle(runs[j].styleName), true);

      // 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) {

      if (content[i].styleName != null) {


  public static void main(String[] args) {
    try {
    } catch (Exception evt) {}
    JFrame f = new JFrame("Text Pane Views");

    // 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

    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);

    f.getContentPane().add(new JScrollPane(pane));
    f.setSize(500, 300);

    try {
      // Dump the view structure
      ViewDisplayer.displayViews(pane, System.out);
    } catch (InterruptedException e) {

  // 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(
          new Run[] {
              new Run(null, "The simple "),
              new Run(charStyleName, "PlainDocument"),
              new Run(
                  " 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(
                  " 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(
                  " and is also the base class from which "
                      + "more specific models, such as the "),
              new Run(charStyleName, "HTMLDocument"),
              new Run(
                  " 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,
          " ") }) };

class ViewDisplayer {
  public static void displayViews(JTextComponent comp, PrintStream out) {
    View rootView = comp.getUI().getRootView(comp);
    displayView(rootView, 0, comp.getDocument(), out);

  public static void displayView(View view, int indent, Document doc,
      PrintStream out) {
    String name = view.getClass().getName();
    for (int i = 0; i < indent; i++) {

    int start = view.getStartOffset();
    int end = view.getEndOffset();
    out.println(name + "; offsets [" + start + ", " + end + "]");
    int viewCount = view.getViewCount();
    if (viewCount == 0) {
      int length = Math.min(32, end - start);
      try {
        String txt = doc.getText(start, length);
        for (int i = 0; i < indent + 1; i++) {
        out.println("[" + txt + "]");
      } catch (BadLocationException e) {
    } else {
      for (int i = 0; i < viewCount; i++) {
        displayView(view.getView(i), indent + 1, doc, out);


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