Java tutorial
/* Core SWING Advanced Programming By Kim Topley ISBN: 0 13 083292 8 Publisher: Prentice Hall */ import javax.swing.*; import javax.swing.text.*; import java.awt.*; import java.net.URL; public class TextPaneElements { 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 = TextPaneElements.class; URL url = thisClass.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, (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++) { 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("Text Pane Elements"); // 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); // Dump the element structure ((AbstractDocument) pane.getDocument()).dump(System.out); } }); } catch (Exception e) { System.out.println("Exception when constructing document: " + e); System.exit(1); } f.getContentPane().add(new JScrollPane(pane)); f.setSize(500, 300); 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, " ") }) }; }