Adding Undo and Redo to a Text Component (转)-优快云博客

本文介绍如何为JTextArea组件添加撤销(Undo)和重做(Redo)功能，通过实现UndoManager及相应监听器，使得文本编辑操作具备基本的撤销与重做能力。

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Adding Undo and Redo to a Text Component (转)[@more@]

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Adding Undo and Redo to a Text Component

JTextArea textarea = new JTextArea(); final Undomanager undo = new UndoManager(); Document doc = textarea.getDocument(); //The next two lines should be in one line. doc.addUndoableEditListener( new UndoableEditListener() { The next two lines should be in one line. public void undoableEditHappened( UndoableEditEvent evt) { undo.addEdit(evt.getEdit()); } }); textarea.getActionMap().put("Undo", new AbstractAction("Undo") { public void actionPerformed(ActionEvent evt) { try { if (undo.canUndo()) { undo.undo(); } } catch (CannotUndoException e) { } } }); textarea.getInputMap().put(KeyStroke.getKeyStroke( "control Z"), "Undo"); textarea.getActionMap().put("Redo", new AbstractAction("Redo") { public void actionPerformed(ActionEvent evt) { try { if (undo.canRedo()) { undo.redo(); } } catch (CannotRedoException e) { } } }); textarea.getInputMap().put(KeyStroke.getKeyStroke( "control Y"), "Redo");

Examplets ^TM provided by peRmission of the publisher, Addision-Wesley, and Author Patrick Chan.
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