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,
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 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
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);
}
f.getContentPane().add(new JScrollPane(pane));
f.setSize(500, 300);
f.setVisible(true);
try {
// Dump the view structure
Thread.sleep(30000);
ViewDisplayer.displayViews(pane, System.out);
} catch (InterruptedException e) {
}
System.out.flush();
System.exit(0);
}
// 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,
" ") }) };
}
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++) {
out.print("\t");
}
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.print("\t");
}
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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