在Eclipse RCP中,如何根据编辑器中的"脏"属性禁用保存工具栏按钮

public class DirtyListener implements IPropertyChangeListener {
    @Override
    public void propertyChange(PropertyChangeEvent event) {
        if (event.getProperty().equals(IEditorPart.PROP_DIRTY)) {
            // 更新工具栏按钮状态
        }
    }
}

@Override
public void init(IEditorSite site, IEditorInput input) throws PartInitException {
    setSite(site);
    setInput(input);
    // 添加监听器
    editorPart.addPropertyChangeListener(new DirtyListener());
}

public class DirtyListener implements IPropertyChangeListener {
    private ToolItem saveToolItem;

    public DirtyListener(ToolItem saveToolItem) {
        this.saveToolItem = saveToolItem;
    }

    @Override
    public void propertyChange(PropertyChangeEvent event) {
        if (event.getProperty().equals(IEditorPart.PROP_DIRTY)) {
            boolean isDirty = (boolean) event.getNewValue();
            // 更新工具栏按钮状态
            saveToolItem.setEnabled(!isDirty);
        }
    }
}

@Override
public void createPartControl(Composite parent) {
    // 创建工具栏
    ToolBar toolbar = new ToolBar(parent, SWT.FLAT);

    // 创建保存按钮
    ToolItem saveToolItem = new ToolItem(toolbar, SWT.PUSH);
    saveToolItem.setText("Save");
    saveToolItem.setImage(ImageDescriptor.createFromURL(getClass().getResource("/icons/save.png")).createImage());
    saveToolItem.addSelectionListener(new SelectionAdapter() {
        @Override
        public void widgetSelected(SelectionEvent e) {
            // 保存编辑器内容
        }
    });

    // 添加监听器
    editorPart.addPropertyChangeListener(new DirtyListener(saveToolItem));
}