Using a Popup to Apply Styles to a JTextPane
This example implements a text pane that allows the user to display a
popup of available styles. If the user selects a style in the popup,
the characters in the selection are formatted with the attributes in
the style.
JTextPane textPane = new JTextPane();
// Makes text red
Style style = textPane.addStyle("Red", null);
StyleConstants.setForeground(style, Color.red);
// Inherits from "Red"; makes text red and underlined
style = textPane.addStyle("Red Underline", style);
StyleConstants.setUnderline(style, true);
// Makes text 24pts
style = textPane.addStyle("24pts", null);
StyleConstants.setFontSize(style, 24);
// Makes text 12pts
style = textPane.addStyle("12pts", null);
StyleConstants.setFontSize(style, 12);
// Makes text italicized
style = textPane.addStyle("Italics", null);
StyleConstants.setItalic(style, true);
// Makes text bold
style = textPane.addStyle("Bold", null);
StyleConstants.setBold(style, true);
JTextPane c = textPane;
// Construct a sorted list of style names
DefaultStyledDocument doc = (DefaultStyledDocument)textPane.getDocument();
java.util.List l = new ArrayList();
Enumeration enum = doc.getStyleNames();
while (enum.hasMoreElements()) {
l.add(enum.nextElement());
}
Collections.sort(l);
// First sub menu applies character attributes
final JPopupMenu menu = new JPopupMenu();
JMenu submenu = new JMenu("Character");
for (int i=0; i<l.size(); i++) {
submenu.add(new JMenuItem(new DoStyleAction((String)l.get(i), CHARACTER)));
}
menu.add(submenu);
// Second sub menu applies paragraph attributes
submenu = new JMenu("Paragraph");
for (int i=0; i<l.size(); i++) {
submenu.add(new JMenuItem(new DoStyleAction((String)l.get(i), PARAGRAPH)));
}
menu.add(submenu);
// Third submenu applies logical attributes
submenu = new JMenu("Logical");
for (int i=0; i<l.size(); i++) {
submenu.add(new JMenuItem(new DoStyleAction((String)l.get(i), LOGICAL)));
}
menu.add(submenu);
// Add a listener to display pop-up
textPane.addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent evt) {
if (evt.isPopupTrigger()) {
menu.show(evt.getComponent(), evt.getX(), evt.getY());
}
}
public void mouseReleased(MouseEvent evt) {
if (evt.isPopupTrigger()) {
menu.show(evt.getComponent(), evt.getX(), evt.getY());
}
}
});
static final int CHARACTER = 1;
static final int PARAGRAPH = 2;
static final int LOGICAL = 3;
// Assumes the style name is the same as the action name.
// The type specifies how the style should be applied.
// The style is applied to the text within the selection.
public static class DoStyleAction extends StyledEditorKit.StyledTextAction {
int type;
public DoStyleAction(String styleName, int type) {
super(styleName);
this.type = type;
}
public void actionPerformed(ActionEvent e) {
JTextPane c = (JTextPane)getEditor(e);
if (c != null) {
String styleName = e.getActionCommand();
StyledDocument doc = (StyledDocument)c.getDocument();
switch (type) {
case CHARACTER:
c.setCharacterAttributes(doc.getStyle(styleName), true);
break;
case PARAGRAPH:
c.setParagraphAttributes(doc.getStyle(styleName), true);
break;
case LOGICAL:
c.setLogicalStyle(doc.getStyle(styleName));
break;
}
}
}
}
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