Question

我有 VTreePanel 类，它扩展自从JPanel扩展的CPanel。该类有一个 JSplitPane 对象，该对象分为两个区域：left＆amp;对。左侧包含树状菜单选择对象。在右侧，它包含 JTabbedPane 对象。 VTreePanel类是这样的：

public final class VTreePanel extends CPanel
    implements ActionListener
{
    private JSplitPane centerSplitPane = new JSplitPane();

    private JTabbedPane tabbedPane;

    ...

    // GET method for the tabbedPane    
    public JTabbedPane getTabbedPane() {
        return tabbedPane;
    }

    // Constructor
    public VTreePanel(int WindowNo, boolean hasBar, boolean editable)
    {

        ...

        tabbedPane = new JTabbedPane();
        centerSplitPane.add(treePart, JSplitPane.LEFT);
        centerSplitPane.add(tabbedPane, JSplitPane.RIGHT);  // Look at this

        ...
    }

}

在构造函数中，我将树选择（treePart）和JTabbedPane对象（ tabbedPane ）添加到JSplitPane对象（centerSplitPane）中。我还没有在tabbedPane中添加任何Tab。请看下面的截图：

http://i45.tinypic.com/2v3j0nl.jpg

然后，当用户点击其中一个菜单时，如何添加标签？

我有 AMenu 类，它实现了PropertyChangeListener，当用户点击菜单时触发了propertyChange方法：

public final class AMenu extends CFrame
    implements ActionListener, PropertyChangeListener, ChangeListener
{

    private VTreePanel treePanel = null;    // this is the VTreePanel object

    ...

    public void propertyChange(PropertyChangeEvent e)
    {
        ...

        // Here I pass the VTreePanel object as parameter to AMenuStartItem thread object
        (new AMenuStartItem(cmd, true, sta, this, treePanel)).start();
    }

}

您可以看到我有VTreePanel对象（ treePanel ），我将VTreePanel对象作为参数传递给 AMenuStartItem 线程。 AMenuStartItem包含在JTabbedPane中执行添加Tab的逻辑（记住，JTabbedPane对象（tabbedPane）在VTreePanel中）。

这是 AMenuStartItem 线程类：

public class AMenuStartItem extends Thread implements ActionListener
{
    private VTreePanel m_vtreePanel;

    public AMenuStartItem (int ID, boolean isMenu, String name, AMenu menu, VTreePanel vtreepanel)
    {
        ...

        m_vtreePanel = vtreepanel;  // save the VTreePanel object
    }

    // The thread method that executed when thread is started
    public void run()
    {
        ...

        startWindow(0, cmd);

        ...
    }

    private void startWindow(int AD_Workbench_ID, int AD_Window_ID)
    {
        ...

        // Here I perform adding new tab
        m_vtreePanel.getTabbedPane().addTab(frame.getTitle(), frame.getAPanel());

        ...
    }

}

因此， getTabbedPane（）返回了JTabbedPane对象，并且执行了addTab（）方法，但根本没有显示任何标签。

任何人都知道如何解决这个问题？

Answer 1

与UI的所有交互必须通过事件调度线程完成，没有例外......

public class AMenuStartItem extends Thread implements ActionListener
{
    private VTreePanel m_vtreePanel;

    public AMenuStartItem (int ID, boolean isMenu, String name, AMenu menu, VTreePanel vtreepanel)
    {
        ...

        m_vtreePanel = vtreepanel;  // save the VTreePanel object
    }

    // The thread method that executed when thread is started
    public void run()
    {
        ...

        startWindow(0, cmd);

        ...
    }

    private void startWindow(final int AD_Workbench_ID, final int AD_Window_ID)
    {
        ...

        if (EventQueue.isDispatchingThread()) {
            // This is safe, we're in the EDT
            m_vtreePanel.getTabbedPane().addTab(frame.getTitle(), frame.getAPanel());
            m_vtreePanel.getTabbedPane().invalidate();
            m_vtreePanel.getTabbedPane().repaint();
        } else {
            // This is unsafe, we need to resync with the EDT
            SwingUtilities.invokeLater(new Runnable() {
                public void run() {
                    // Here I perform adding new tab
                    m_vtreePanel.getTabbedPane().addTab(frame.getTitle(), frame.getAPanel());
                    m_vtreePanel.getTabbedPane().invalidate();
                    m_vtreePanel.getTabbedPane().repaint();

                }
            });
        }

        ...
    }

}

JTabbedPane中添加的选项卡不会显示

1 个答案: