import java.awt.*;
import java.awt.event.*;
import java.io.IOException;
import java.net.URL;
import java.util.Enumeration;
import javax.swing.*;
import javax.swing.text.*;
public class StyleAttributes implements ActionListener {
//////// Code below copied from TextSamplerDemo.java////////
//////// found on How to Use Editor Panes and Text Panes ////////
//////// at http://java.sun.com/docs/books/tutorial/////////
////////uiswing/components/editorpane.html////////
JTextPane textPane;
private String newline = "\n";
protected static final String buttonString = "JButton";
private JScrollPane getContent() {
//Create a text pane.
textPane = createTextPane();
JScrollPane paneScrollPane = new JScrollPane(textPane);
paneScrollPane.setVerticalScrollBarPolicy(
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
paneScrollPane.setPreferredSize(new Dimension(250, 155));
paneScrollPane.setMinimumSize(new Dimension(10, 10));
return paneScrollPane;
}
private JTextPane createTextPane() {
String[] initString =
{ "This is an editable JTextPane, ",//regular
"another ",//italic
"styled ",//bold
"text ", //small
"component, ",//large
"which supports embedded components..." + newline,//regular
" " + newline,//button
"...and embedded icons..." + newline, //regular
" ",//icon
newline + "JTextPane is a subclass of JEditorPane that " +
"uses a StyledEditorKit and StyledDocument, and provides " +
"cover methods for interacting with those objects."
};
String[] initStyles =
{ "regular", "italic", "bold", "small", "large",
"regular", "button", "regular", "icon",
"regular"
};
JTextPane textPane = new JTextPane();
StyledDocument doc = textPane.getStyledDocument();
addStylesToDocument(doc);
try {
for (int i=0; i < initString.length; i++) {
doc.insertString(doc.getLength(), initString[i],
doc.getStyle(initStyles[i]));
}
} catch (BadLocationException ble) {
System.err.println("Couldn't insert initial text into text pane.");
}
return textPane;
}
protected void addStylesToDocument(StyledDocument doc) {
//Initialize some styles.
Style def = StyleContext.getDefaultStyleContext().
getStyle(StyleContext.DEFAULT_STYLE);
Style regular = doc.addStyle("regular", def);
StyleConstants.setFontFamily(def, "SansSerif");
Style s = doc.addStyle("italic", regular);
StyleConstants.setItalic(s, true);
s = doc.addStyle("bold", regular);
StyleConstants.setBold(s, true);
s = doc.addStyle("small", regular);
StyleConstants.setFontSize(s, 10);
s = doc.addStyle("large", regular);
StyleConstants.setFontSize(s, 16);
s = doc.addStyle("icon", regular);
StyleConstants.setAlignment(s, StyleConstants.ALIGN_CENTER);
ImageIcon pigIcon = createImageIcon("tutorial/images/Pig.gif",
"a cute pig");
if (pigIcon != null) {
StyleConstants.setIcon(s, pigIcon);
}
s = doc.addStyle("button", regular);
StyleConstants.setAlignment(s, StyleConstants.ALIGN_CENTER);
ImageIcon soundIcon = createImageIcon("tutorial/images/sound.gif",
"sound icon");
JButton button = new JButton();
if (soundIcon != null) {
button.setIcon(soundIcon);
} else {
button.setText("BEEP");
}
button.setCursor(Cursor.getDefaultCursor());
button.setMargin(new Insets(0,0,0,0));
button.setActionCommand(buttonString);
button.addActionListener(this);
StyleConstants.setComponent(s, button);
}
/** Returns an ImageIcon, or null if the path was invalid. */
protected static ImageIcon createImageIcon(String path,
String description) {
java.net.URL imgURL = TextSamplerDemo.class.getResource(path);
if (imgURL != null) {
return new ImageIcon(imgURL, description);
} else {
System.err.println("Couldn't find file: " + path);
return null;
}
}
public void actionPerformed(ActionEvent e) {
String ac = e.getActionCommand();
if (buttonString.equals(ac))
Toolkit.getDefaultToolkit().beep();
//////// End code copied from TextSamplerDemo.java ////////
// Show attributes at the current position of caret.
if(ac.equals("show local")) {
int pos = textPane.getCaretPosition();
StyledDocument doc = textPane.getStyledDocument();
Element element = doc.getCharacterElement(pos);
AttributeSet attrs = element.getAttributes();
String name = element.getName();
showElementAttributes(attrs, name, pos);
}
// Show attributes of all styles in textPane.
if(ac.equals("all styles"))
showTextPaneStyles();
}
private void showElementAttributes(AttributeSet attrs, String id, int pos) {
System.out.printf("Element %s at pos = %d attribute count = %d%n",
id, pos, attrs.getAttributeCount());
Enumeration e = attrs.getAttributeNames();
while(e.hasMoreElements()) {
Object key = e.nextElement();
Object value = attrs.getAttribute(key);
System.out.printf("\tAttribute: key=%s value=%s%n", key, value);
}
System.out.println("--");
}
//////// Code copied from////////
////////Listing the Styles Associated with a JTextPane ////////
//////// at http://javaalmanac.com/egs/javax.swing.text/////////
////////style_ListStyles.html?l=rel////////
private void showTextPaneStyles() {
DefaultStyledDocument doc = (DefaultStyledDocument)textPane.getDocument();
Enumeration e = doc.getStyleNames();
System.out.println("==== All Styles in textPane ====");
while (e.hasMoreElements()) {
String styleName = (String)e.nextElement();
System.out.printf("styleName = %s%n", styleName);
// Get style object
Style style = doc.getStyle(styleName);
showAttributes(style);
}
System.out.println("========");
}
//////// Code copied from ////////
////////Listing the Attributes in a Style////////
//////// at http://javaalmanac.com/egs/javax.swing.text/ ////////
////////style_ListAttr.html?l=rel ////////
private void showAttributes(Style style) {
// Get number of attributes
int count = style.getAttributeCount();
System.out.println("attribute count = " + count);
// Get enumeration of attribute names; an attribute name can be
// either a string or a StyleConstants object.
Enumeration e = style.getAttributeNames();
while (e.hasMoreElements()) {
Object o = e.nextElement();
if (o instanceof String) {
String attrName = (String)o;
Object attrValue = style.getAttribute(attrName);
System.out.printf("\tAttribute: name=%s value=%s%n",
attrName, attrValue);
} else if (o == StyleConstants.NameAttribute) {
// Retrieve the style's name
String styleName = (String)style.getAttribute(o);
System.out.printf("\tNameAttribute: %s%n", styleName);
} else if (o == StyleConstants.ResolveAttribute) {
// Retrieve the style's parent
Style parent = (Style)style.getAttribute(o);
System.out.printf("\tResolveAttribute: %s%n", parent.getName());
} else {
// Retrieve the style constant name and value
String attrName = o.toString();
Object attrValue = style.getAttribute(o);
System.out.printf("\tStyleConstants: name=%s value=%s%n",
attrName, attrValue);
}
}
}
private JPanel getControl() {
JButton local = new JButton("attributes at caret");
JButton styles = new JButton("all styles");
local.setActionCommand("show local");
styles.setActionCommand("all styles");
local.addActionListener(this);
styles.addActionListener(this);
JPanel panel = new JPanel();
panel.add(local);
panel.add(styles);
return panel;
}
public static void main(String[] args) {
StyleAttributes sa = new StyleAttributes();
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().add(sa.getContent());
f.getContentPane().add(sa.getControl(), "Last");
f.setSize(400,400);
f.setLocation(200,200);
f.setVisible(true);
}
}
