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@yashrs

yashrs/undoredo.java Secret

Created Mar 28, 2020
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public void addUndoRedoCapabilities(JTextArea textcomp){
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());
}
});
textcomp.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
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") {
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");
}
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