java 擦除 Swing 内容窗格/面板并显示新面板
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Erase Swing Content Pane/Panel & display a new panel
提问by Jim
I have created an applet where when you press the button "Forgot Pass" I erase the current JPanel on the applet & create a new JPanel that displays the JComponents related to Retrieving/Forgetting a password.
我创建了一个小程序，当您按下“忘记密码”按钮时，我会擦除小程序上的当前 JPanel，并创建一个新的 JPanel，显示与检索/忘记密码相关的 JComponent。
I can successfully clear the JPanel using .removeAll(); BUTafter I create all my new JComponents & add them to the content pane (main JPanel) the applet just goes gray & doesn't show the new JPanel & components UNLESSI resize the applet, then it repaints & works.
我可以使用 .removeAll(); 成功清除 JPanel；但是在我创建所有新的 JComponents 并将它们添加到内容窗格（主 JPanel）之后，小程序只是变灰并且不显示新的 JPanel 和组件，除非我调整小程序的大小，然后它会重新绘制和工作。
I have tried putting .invalidate() after I have created all the new JComponents but that still doesn't refresh the applet?
我已经尝试在创建所有新 JComponents 后放置 .invalidate() ，但仍然没有刷新小程序？
How can I make my JPanel appear after I clear it with .removeAll() & add different JComponents to it?
在使用 .removeAll() 清除 JPanel 并向其添加不同的 JComponents 后，如何使 JPanel 出现？
Code:
代码：
public class App extends JApplet
{
JPanel mainPanel;
public void init()
{
SwingUtilities.invokeAndWait( new Runnable() {
public void run()
{
showLoginPanel(); // this shows fine on loading
}
});
}
public void showForgotPassPanel()
{
mainPanel.removeAll();
mainPanel = (JPanel) getContentPane();
Box hBox = Box.createHorizontalBox();
Box vBox = Box.createVerticalBox();
mainPanel.setLayout( new BorderLayout() );
... create components
... add components to mainPanel
mainPanel.invalidate(); // doesn't make new layout visible, not unless I resize the applet
}
}
回答by POSIX_ME_HARDER
Use mainPanel.revalidate();and/or mainPanel.repaint();methods.
使用mainPanel.revalidate();和/或mainPanel.repaint();方法。
回答by Hovercraft Full Of Eels
Another "clean" option is to swap views with a CardLayout. It does all the dirty work for you behind the scenes.
另一个“干净”的选择是用 CardLayout 交换视图。它在幕后为您完成所有肮脏的工作。
