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, (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("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(500, 250));
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(2, 4, 2, 4));
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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