[英]How can I get the card layout of an jInternalPane?
I have a jInternalPane
within a jDesktopPane
. 我在jInternalPane
中有一个jDesktopPane
。 The jDesktopPane
is within a jPanel
that has the BorderLayout
layout. jDesktopPane
位于具有BorderLayout
布局的jPanel
中。
In my internal pane, I am trying to programatically switch cards. 在我的内部窗格中,我试图以编程方式切换卡。 I have the following, relevant piece of code that breaks: 我有以下相关的可中断代码:
public void switchCards() {
CardLayout cl = (CardLayout)(internalFrame1.getLayout());
cl.show(internalFrame1, "card1"); //Where card1 is a jPanel
}
However, in the error trace, I can see the following: 但是,在错误跟踪中,我可以看到以下内容:
javax.swing.plaf.basic.BasicInternalFrameUI$Handler cannot be cast to java.awt.CardLayout
. javax.swing.plaf.basic.BasicInternalFrameUI$Handler cannot be cast to java.awt.CardLayout
。
Can someone please point me in the right direction to properly handle this error? 有人可以指出正确的方向来正确处理此错误吗? I would love to learn how to do it! 我很想学习如何做!
Many thanks in advance. 提前谢谢了。
You would use a CardLayout on the content pane of the JInternalFrame, not the internal frame itself. 您将在JInternalFrame的内容窗格上使用CardLayout,而不是内部框架本身。
You can just set the layout of the content pane: 您可以只设置内容窗格的布局:
Container contentPane = internalFrame.getContentPane();
contentPane.setLayout( new CardLayout() );
contentPane.add(panel1, "Card1");
contentPane.add(panel2, "Card2");
Then your switchCards() method would be: 然后,您的switchCards()方法将是:
Container contentPane = internalFrame.getContentPane();
CardLayout cl = (CardLayout)(contentPane.getLayout());
cl.show(contentPane, "card1"); //Where card1 is a jPanel
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