因此,在这一点上,我只有一个简单的JFrame,其中包含一个简单的JPanel。 (即contentPaneJPanel。)JFrame中有一个菜单栏,带有一个将当前JFrame转换为JInternalFrame的按钮-它设置了JFrame的移至预先存在的contentPane,并将JDesktopPane内部的JPanel移至新创建的JFrame-并创建第二个JInternalFrame,其中包含新的JInternalFrame。这是我的代码:

if(ae.getActionCommand().equals("newWindow"))
{
    if(jdp.getComponentCount() > 0)//jdp is the pre-existing JDesktopPane
    {
        //All of the code in this if statement works fine. It's the else in which I am getting problems.
        DefaultInternalFrame dif = new DefaultInternalFrame();//DefaultInternalFrame is an extension of JInternalFrame which is literally nothing more than a JInternalFrame right now.
        jdp.add(dif);
        dif.setContentPane(new DefaultPanel());//Much like DefaultInternalFrame, DefaultPanel is just an extension of JPanel which I plan on adding to, but have not yet.
        dif.setVisible(true);
        dif.moveToFront();
    }else
    {
        //Again, this is where I'm having issues..
        DefaultPanel dp = (DefaultPanel)baseFrame.getContentPane();
        jdp.setVisible(true);
        baseFrame.setContentPane(jdp);
        DefaultInternalFrame dif = new DefaultInternalFrame();
        jdp.add(dif);
        dif.setContentPane(dp);
        dif.setVisible(true);
        dif.moveToFront();

        DefaultInternalFrame dif2 = new DefaultInternalFrame();
        jdp.add(dif2);
        dif2.setContentPane(new DefaultPanel());
        dif2.setVisible(true);
        dif2.moveToFront();
    }
    arrangeHorizontally();//This takes care of resizing and relocating the JInternalFrames. (It is definitely not the problem.)
}


我遇到的问题是JPanel的优先级似乎越来越高。也就是说,执行此代码后,看不到两个JDesktopPane,而是看到JInternalFrames。这不是因为JDesktopPane的大小或位置问题。我已经进行了广泛检查(通过在JInternalFrame方法之后打印大小和位置)。所以,我很茫然。有什么帮助吗?

SSCCE:

private static JFrame f;
private static JDesktopPane desktop;
public static void main(String[] args) throws InterruptedException
{
    desktop = new JDesktopPane();

    f = new JFrame("Test");
    f.setPreferredSize(new Dimension(500,500));
    f.setContentPane(new JPanel());

    f.pack();
    f.setVisible(true);

    Thread.sleep(4000); //Just so you can see the before/after

    JPanel panel = (JPanel)f.getContentPane();

    desktop.setVisible(true);
    f.setContentPane(desktop);

    JInternalFrame inFrame = new JInternalFrame("1");
    desktop.add(inFrame);
    inFrame.setContentPane(panel);
    inFrame.setPreferredSize(new Dimension(200,200));//Just some random size; doesn't matter.
    inFrame.pack();
    inFrame.setVisible(true);

    JInternalFrame inFrame2 = new JInternalFrame("2");
    desktop.add(inFrame2);
    inFrame2.setContentPane(new JPanel());
    inFrame2.setPerferedSize(new Dimension(200,200));
    inFrame2.pack();
    inFrame2.setVisible(true);
}


那应该工作..
好的,SSCCE实际上可以正常工作。这使我感到奇怪,为什么原始的不起作用?

最佳答案

内容窗格中的更改可能不足以使框架本身进行更新(您认为可以,但是很麻烦)。

在您的切换代码中,尝试从框架向validate添加呼叫...

//Again, this is where I'm having issues..
DefaultPanel dp = (DefaultPanel)baseFrame.getContentPane();
jdp.setVisible(true);
baseFrame.setContentPane(jdp);
DefaultInternalFrame dif = new DefaultInternalFrame();
jdp.add(dif);
dif.setContentPane(dp);
dif.setVisible(true);
dif.moveToFront();

DefaultInternalFrame dif2 = new DefaultInternalFrame();
jdp.add(dif2);
dif2.setContentPane(new DefaultPanel());
dif2.setVisible(true);
dif2.moveToFront();

baseFrame.validate(); // <-- Call me


您可能还需要调用repaint,但请查看从何处获得帮助。

关于java - 使JInternalFrame出现的问题,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/14470969/

10-12 04:15