javax.swing.text.Document#removeUndoableEditListener ( )源码实例Demo

public void startNewDocument() {
	Document oldDoc = textPane.getDocument();
	if (oldDoc != null)
		oldDoc.removeUndoableEditListener(undoHandler);
	HTMLEditorKit editorKit = new HTMLEditorKit();
	document = (HTMLDocument) editorKit.createDefaultDocument();
	textPane.setDocument(document);
	currentFile = null;
	setTitle("HTMLDocumentEditor");
	textPane.getDocument().addUndoableEditListener(undoHandler);
	resetUndoManager();
}
 

public void openDocument() {
	try {
		File current = new File(".");
		JFileChooser chooser = new JFileChooser(current);
		chooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
		chooser.setFileFilter(new HTMLFileFilter());
		int approval = chooser.showSaveDialog(this);
		if (approval == JFileChooser.APPROVE_OPTION) {
			currentFile = chooser.getSelectedFile();
			setTitle(currentFile.getName());
			FileReader fr = new FileReader(currentFile);
			Document oldDoc = textPane.getDocument();
			if (oldDoc != null)
				oldDoc.removeUndoableEditListener(undoHandler);
			HTMLEditorKit editorKit = new HTMLEditorKit();
			document = (HTMLDocument) editorKit.createDefaultDocument();
			editorKit.read(fr, document, 0);
			document.addUndoableEditListener(undoHandler);
			textPane.setDocument(document);
			resetUndoManager();
		}
	} catch (BadLocationException ble) {
		System.err.println("BadLocationException: " + ble.getMessage());
	} catch (FileNotFoundException fnfe) {
		System.err.println("FileNotFoundException: " + fnfe.getMessage());
	} catch (IOException ioe) {
		System.err.println("IOException: " + ioe.getMessage());
	}
}
 

public void testSourceEditSyncUndo() throws Exception {
    defaultSetup();
    UndoManager urListener = new UndoManager();
    Document doc = mModel.getBaseDocument();
    mModel.addUndoableEditListener(urListener);
    
    mModel.startTransaction();
    B b2 = new B(mModel, 2);
    mModel.getRootComponent().addAfter(b2.getName(), b2, TestComponent3._A);
    mModel.endTransaction();
    assertEquals("first edit setup", 2, mModel.getRootComponent().getChildren(B.class).size());
    
    // see fix for issue 83963, with this fix we need coordinate edits from
    // on XDM model and on document buffer.  This reduce XDM undo/redo efficiency,
    // but is the best we can have to satisfy fine-grained text edit undo requirements.
    mModel.removeUndoableEditListener(urListener);
    doc.addUndoableEditListener(urListener);
    
    Util.setDocumentContentTo(doc, "resources/test2.xml");
    assertEquals("undo sync", 1, mModel.getRootComponent().getChildren(C.class).size());
    mModel.sync();
    doc.removeUndoableEditListener(urListener);
    
    assertEquals("sync setup", 1, mModel.getRootComponent().getChildren(B.class).size());
    assertEquals("sync setup", 0, mModel.getRootComponent().getChildren(C.class).size());
    
    // setDocumentContentTo did delete all, then insert, hence 2 undo's'
    urListener.undo(); urListener.undo(); 
    mModel.sync(); // the above undo's are just on document buffer, needs sync (inefficient).
    assertEquals("undo sync", 1, mModel.getRootComponent().getChildren(C.class).size());
    assertEquals("undo sync", 2, mModel.getRootComponent().getChildren(B.class).size());

    urListener.undo();
    assertEquals("undo first edit before sync", 1, mModel.getRootComponent().getChildren(B.class).size());

    urListener.redo();
    assertEquals("redo first edit", 1, mModel.getRootComponent().getChildren(C.class).size());
    assertEquals("redo first edit", 2, mModel.getRootComponent().getChildren(B.class).size());

    // needs to back track the undo's, still needs sync'
    urListener.redo(); urListener.redo();
    mModel.sync();
    assertEquals("redo to sync", 1, mModel.getRootComponent().getChildren(B.class).size());
    assertEquals("redo to sync", 0, mModel.getRootComponent().getChildren(C.class).size());
}