/**
* Add undo/redo support to a text component. Undo is bound to "ctrl-z", redo to "ctrl-y".
*
* @param textcomp The text component.
*/
public static void addUndoSupport(JTextComponent textcomp) {
// Based on
// http://www.exampledepot.com/egs/javax.swing.undo/UndoText.html
final UndoManager undo = new UndoManager();
Document doc = textcomp.getDocument();
// Listen for undo and redo events
doc.addUndoableEditListener(
new UndoableEditListener() {
public void undoableEditHappened(UndoableEditEvent evt) {
undo.addEdit(evt.getEdit());
}
});
// Create an undo action and add it to the text component
textcomp
.getActionMap()
.put(
"Undo",
new AbstractAction("Undo") {
private static final long serialVersionUID = -1616574389415095169L;
public void actionPerformed(ActionEvent evt) {
try {
if (undo.canUndo()) {
undo.undo();
}
} catch (CannotUndoException e) {
}
}
});
// Bind the undo action to ctl-Z
textcomp.getInputMap().put(KeyStroke.getKeyStroke("control Z"), "Undo");
// Create a redo action and add it to the text component
textcomp
.getActionMap()
.put(
"Redo",
new AbstractAction("Redo") {
private static final long serialVersionUID = 58635276936990330L;
public void actionPerformed(ActionEvent evt) {
try {
if (undo.canRedo()) {
undo.redo();
}
} catch (CannotRedoException e) {
}
}
});
// Bind the redo action to ctl-Y
textcomp.getInputMap().put(KeyStroke.getKeyStroke("control Y"), "Redo");
}
private void initUndoFeature() {
Document doc = textcomp.getDocument();
// Listen for undo and redo events
doc.addUndoableEditListener(
new UndoableEditListener() {
public void undoableEditHappened(UndoableEditEvent ev) {
undoMenuItem.setEnabled(true);
addEdit(ev.getEdit());
refreshEnabledStatus();
}
});
// Create an undo action and add it to the text component
textcomp
.getActionMap()
.put(
"Undo",
new AbstractAction("Undo") { // $NON-NLS-1$ //$NON-NLS-2$
public static final long serialVersionUID = 0L;
public void actionPerformed(ActionEvent ev) {
undo();
}
});
// Bind the undo action to ctl-Z
textcomp
.getInputMap()
.put(KeyStroke.getKeyStroke("control Z"), "Undo"); // $NON-NLS-1$ //$NON-NLS-2$
// Create a redo action and add it to the text component
textcomp
.getActionMap()
.put(
"Redo",
new AbstractAction("Redo") { // $NON-NLS-1$ //$NON-NLS-2$
public static final long serialVersionUID = 0L;
public void actionPerformed(ActionEvent ev) {
redo();
}
});
// Bind the redo action to ctl-Y
textcomp
.getInputMap()
.put(KeyStroke.getKeyStroke("control Y"), "Redo"); // $NON-NLS-1$ //$NON-NLS-2$
}
/** add Undo and Redo bindings to a text component */
public static void addUndoFunctionality(JTextComponent text) {
// Add an undo manager
final UndoManager undo = new UndoManager();
Document doc = text.getDocument();
// Listen for undo and redo events
doc.addUndoableEditListener(
new UndoableEditListener() {
public void undoableEditHappened(UndoableEditEvent evt) {
undo.addEdit(evt.getEdit());
}
});
// Create an undo action and add it to the text component
text.getActionMap()
.put(
"Undo",
new AbstractAction("Undo") {
public void actionPerformed(ActionEvent evt) {
try {
if (undo.canUndo()) {
undo.undo();
}
} catch (CannotUndoException e) {
}
}
});
// Bind the undo action to ctl-Z
text.getInputMap().put(KeyStroke.getKeyStroke("control Z"), "Undo");
// Create a redo action and add it to the text component
text.getActionMap()
.put(
"Redo",
new AbstractAction("Redo") {
public void actionPerformed(ActionEvent evt) {
try {
if (undo.canRedo()) {
undo.redo();
}
} catch (CannotRedoException e) {
}
}
});
// Bind the redo action to ctl-Y
text.getInputMap().put(KeyStroke.getKeyStroke("control Y"), "Redo");
}
/**
* Construct an undo listener with default key mappings. The default key mappings invoke the undo
* and redo actions on <i>textArea</i> .
*
* <p>A typical usage pattern would be: <code>
* JTextArea textArea = new JTextArea("testing");
* textArea.getDocument().addUndoableEditListener(new UndoListener(textArea));
* </code>
*
* @param textArea the text component that is being listened to and upon which undo/redo actions
* will be performed
*/
public UndoListener(JTextComponent textArea) {
// Set the mapping for shortcut keys;
InputMap inputMap = textArea.getInputMap();
ActionMap actionMap = textArea.getActionMap();
// Ctrl-z or equivalent to undo.
inputMap.put(
KeyStroke.getKeyStroke(KeyEvent.VK_Z, Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()),
"undo");
actionMap.put("undo", _undoAction);
// Ctrl-y or equivalent to redo
inputMap.put(
KeyStroke.getKeyStroke(KeyEvent.VK_Y, Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()),
"redo");
actionMap.put("redo", _redoAction);
}
