UndoManager mgr = new UndoManager();
// Show how insignificant edits are skipped over.
//
// # adds? sig? replace?
mgr.addEdit(new SampleUndoableEdit(1, false, true, false));
mgr.addEdit(new SampleUndoableEdit(2, false, true, false));
mgr.addEdit(new SampleUndoableEdit(3, false, false, false));
mgr.addEdit(new SampleUndoableEdit(4, false, false, false));
System.out.println("--------------------------");
System.out.println("Insignificant edit example");
System.out.println("--------------------------");
mgr.undo();
mgr.redo();
System.out.println(mgr.canRedo()); // No more sig. edits
// Show how edits that call add/replace are used.
//
// # adds? sig? replace?
mgr.addEdit(new SampleUndoableEdit(5, true, true, false));
mgr.addEdit(new SampleUndoableEdit(6, false, true, false));
System.out.println("----------------------------------");
System.out.println("Absorbed (by addEdit) edit example");
System.out.println("----------------------------------");
mgr.undo();
mgr.discardAllEdits();
// # adds? sig? replace?
mgr.addEdit(new SampleUndoableEdit(1, false, true, false));
mgr.addEdit(new SampleUndoableEdit(2, false, true, true));
System.out.println("--------------------------------------");
System.out.println("Absorbed (by replaceEdit) edit example");
System.out.println("--------------------------------------");
mgr.undo();
System.out.println(mgr.canUndo());
// Show how changing limit works.
mgr.discardAllEdits();
// # adds? sig? replace?
mgr.addEdit(new SampleUndoableEdit(1, false, true, false));
mgr.addEdit(new SampleUndoableEdit(2, false, true, false));
mgr.addEdit(new SampleUndoableEdit(3, false, true, false));
mgr.addEdit(new SampleUndoableEdit(4, false, true, false));
mgr.addEdit(new SampleUndoableEdit(5, false, true, false));
mgr.addEdit(new SampleUndoableEdit(6, false, true, false));
System.out.println("----------------------");
System.out.println("Changing limit example");
System.out.println("----------------------");
mgr.undo();
mgr.undo();
mgr.undo(); // Now 3 undoable, 3 redoable
mgr.setLimit(4); // Now 2 undoable, 2 redoable!
while (mgr.canUndo())
mgr.undo();
while (mgr.canRedo())
mgr.redo();
// undoOrRedo example
mgr.discardAllEdits();
mgr.setLimit(1);
// # adds? sig? replace?
mgr.addEdit(new SampleUndoableEdit(1, false, true, false));
System.out.println("------------------");
System.out.println("undoOrRedo example");
System.out.println("------------------");
System.out.println(mgr.getUndoOrRedoPresentationName());
mgr.undoOrRedo();
System.out.println(mgr.getUndoOrRedoPresentationName());
mgr.undoOrRedo();
// Show how UndoManager becomes a CompositeEdit.
mgr.discardAllEdits();
mgr.setLimit(100);
// # adds? sig? replace?
mgr.addEdit(new SampleUndoableEdit(1, false, true, false));
mgr.addEdit(new SampleUndoableEdit(2, false, true, false));
mgr.addEdit(new SampleUndoableEdit(3, false, true, false));
System.out.println("------------------------------");
System.out.println("Transform to composite example");
System.out.println("------------------------------");
mgr.end();
mgr.undo();
mgr.redo();
// Show that adds are no longer allowed. Note that addEdit() returns true in
// pre-JDK 1.2 Swing releases. This is fixed in JDK 1.2.
System.out.println(mgr.addEdit(
new SampleUndoableEdit(4, false, true, false)));
mgr.undo(); // note that edit 4 is not there
