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e1016. Listening for Editing Changes in a JTextComponent
A DocumentEvent is fired each time characters are inserted or
removed from a text component. The event is also fired if the set of
attributes in the text component is changed.
JTextComponent textcomp = new JTextPane();
textcomp.setText("Initial Text");
textcomp.getDocument().addDocumentListener(new DocumentListener() {
// This method is called after an insert into the document
public void insertUpdate(DocumentEvent evt) {
// Get index of newly inserted characters
int off = evt.getOffset();
// Get length of new inserted characters
int len = evt.getLength();
try {
// Get inserted string
String str = evt.getDocument().getText(off, len);
} catch (BadLocationException e) {
}
}
// This method is called after a removal from the document
public void removeUpdate(DocumentEvent evt) {
// Get starting index of removed characters
int off = evt.getOffset();
// Get length of removed characters
int len = evt.getLength();
// The removed characters are not available
}
// This method is called after one or more attributes have changed.
// This method is not called when characters are inserted with attributes.
public void changedUpdate(DocumentEvent evt) {
// Get starting index of characters whose attributes have changed
int off = evt.getOffset();
// Get length of characters whose attributes have changed
int len = evt.getLength();
}
});
e1015.
Listening for Caret Movement Events in a JTextComponent
© 2002 Addison-Wesley.
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