我有JPanels和CardLayout一些很奇怪的症状。从本质上讲,我有卡充当“页”,因为我只能对电网容纳12个细胞,我每页显示的卡,并单击 - >和< - 按钮更改页面相应的(或者是这样的想法)。因为这个数据是代表一个不断变化的模式,每五秒钟,我将有新的卡被添加显示更新信息,并简单地删除旧的页面。

基本上,我构建初始页面当程序启动时:

public OrderSimPanel() {
    super( new CardLayout() );

    // Create the map
    frames = new TreeMap<Integer, String>();

    // Update and draw
    refreshRelevantOrders();
    drawPanel();

    // Set a timer for future updating
    java.util.Timer timer = new java.util.Timer();
    timer.schedule(new UpdateTask(), 5000);

    System.out.println("Constructor DOES get called");
    System.out.println("Panel type is " + this.getLayout().getClass().getName() );
}

在哪里refershReleventOrders()刚刚更新的列表,并drawPanel()是这样的:

private void drawPanel() {
    System.out.println("Panel type is " + this.getLayout().getClass().getName() );

    // Set all old frames to deprecated
    for( Integer k : frames.keySet() ) {
         String o = frames.get( k );
         frames.remove(k);
         k = -k;
         frames.put(k, o);
    }

    // Frame to add to
    JPanel frame = new JPanel( new GridLayout(3,4) );
    int f = 0;

    // Create new cells in groups of 12
    for( int i = 0; i < orders.size(); i++ ) {
        // Pagination powers activate!
        int c = i % 12;
        f = i / 12;

        // Create a new panel if we've run out of room on this one
        if ( c == 0 && i > 0 ) {
            // Add old frame
            String id = new Double( Math.random() ).toString();
            frames.put(f, id);
            add( frame, id );

            // Create new one
            frame = new JPanel( new GridLayout(3,4) );
        }

        // Add the order cell to the panel
        frame.add(new OrderCellPanel( orders.get(i) ));

        i++;
    }

    // Add last frame
    String id = new Double( Math.random() ).toString();
    frames.put(f, id);
    add( frame, id );

    // Set active frame to 0'th frame
    ((CardLayout)(this.getLayout())).show(this, frames.get(0));

    // Erase other frames and from map
    for( Integer k : frames.keySet() ) {
        if( k < 0 ) {
            this.remove(0);
            frames.remove(k);
        }
    }
}

在构造函数中创建计时器任务调用refreshRelevantOrders()的drawPanel()。初始打印输出如下所示:

Panel type is java.awt.CardLayout
Constructor DOES get called
Panel type is java.awt.CardLayout

但是,当计时器执行时,这被显示:

Panel type is javax.swing.GroupLayout

当然,在drawPanel()铸造代码失败。感谢您的任何想法!

有帮助吗?

解决方案

覆盖的setLayout()方法,并打印旧/新布局的类名存在(前或调用超级实施后)。这样,你会看到你的代码的一部分将GroupLayout的面板上。

许可以下: CC-BY-SA归因
不隶属于 StackOverflow
scroll top