[英]How do I remove an old JPanel and add a new one?
I would like to remove an old JPanel from the Window (JFrame) and add a new one. 我想从Window(JFrame)中删除一个旧的JPanel并添加一个新的。 How should I do it? 我该怎么办?
I tried the following: 我尝试了以下方法:
public static void showGUI() {
JFrame frame = new JFrame("Colored Trails");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(partnerSelectionPanel);
frame.setSize(600,400);
frame.setVisible(true);
}
private static void updateGUI(final int i, final JLabel label, final JPanel partnerSelectionPanel) {
SwingUtilities.invokeLater(
new Runnable() {
public void run() {
label.setText(i + " seconds left.");
}
partnerSelectionPanel.setVisible(false); \\ <------------
}
);
}
My code updates the "old" JPanel and then it makes the whole JPanel invisible, but it does not work. 我的代码更新了“旧” JPanel,然后使整个JPanel不可见,但它不起作用。 The compiler complains about the line indicated with <------------
. 编译器抱怨<------------
指示的行。 It writes: <identifier> expected, illegal start of type
. 它写道: <identifier> expected, illegal start of type
。
ADDED: 添加:
I have managed to do what I needed and I did it in the following way: 我已经设法完成了我需要做的事情,并且通过以下方式做到了:
public static void showGUI() {
frame = new JFrame("Colored Trails");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(partnerSelectionPanel);
//frame.add(selectionFinishedPanel);
frame.setSize(600,400);
frame.setVisible(true);
}
public static Thread counter = new Thread() {
public void run() {
for (int i=4; i>0; i=i-1) {
updateGUI(i,label);
try {Thread.sleep(1000);} catch(InterruptedException e) {};
}
partnerSelectionPanel.setVisible(false);
frame.add(selectionFinishedPanel);
}
};
It works but it does not look to me like a safe solution for the following reasons: 它可以工作,但由于以下原因,在我看来它不是一个安全的解决方案:
Should I be doing that? 我应该这样做吗?
setVisible(false), even in the correct place, will not actually remove the panel from the container. setVisible(false),即使在正确的位置,也实际上不会从容器中移除面板。 If you want to replace the panel do this: 如果要更换面板,请执行以下操作:
frame.getContentPane().remove(partnerSelectionPanel);
frame.add(new JPanel());
frame.getContentPane().invalidate();
frame.getContentPane().validate();
Note that frame.getContentPane().add(Component) is the same as frame.add(Component) - the components are actually contained within the content pane. 请注意,frame.getContentPane()。add(Component)与frame.add(Component)相同-组件实际上包含在内容窗格中。
Don't forget or overlook the approach of using the Layout, namely the CardLayout as the Frames Layout, to allow this type of behavior (This is a good strategy for a "Wizard" for example). 不要忘记或忽略使用布局(即CardLayout作为框架布局)来允许这种类型的行为的方法(例如,这对于“向导”来说是个好策略)。 One advantage to this is it doesn't cause any weird flash or draw effects as that is what this Layout is meant to do--Allow a panels to be swapped out, assuming they have exclusive "real estate" or can share the same areas (ie "Wizard" like behavior.) 这样做的一个优点是,它不会引起任何怪异的闪光或绘制效果,这就是此Layout的目的-允许面板交换出来,前提是它们具有专有的“房地产”或可以共享相同的区域(即“向导”之类的行为。)
您可以使用
Frame.setContentPane(jPanel);
partnerSelectionPanel.setVisible(false); \\ <------------
This line is actualy out the method run. 这行实际上是方法运行的结果。
You probably want something like this: 您可能想要这样的东西:
public void run() {
label.setText(i + " seconds left.");
try {
Thread.sleep (i * 1000);
} catch (InterruptedException e) {
handleException (e);
}
partnerSelectionPanel.setVisible(false);
}
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