java - 无法将 JOptionPane 设置为不可见然后再次恢复可见

Question

我想实现的是

• 在某种状态下，一个类应该自动隐藏其他类显示的对话框
• 隐藏的对话框应该在程序状态改变时显示

问题:

• 这不适用于 JOptionPanes
• JOptionPanes 被隐藏并再次显示，但随后它们会自动关闭，所以我只能再次看到它们几秒钟

我使用了以下方法:

public static void main(String[] args) {


    Toolkit.getDefaultToolkit().addAWTEventListener(new AWTEventListener() {

        public void eventDispatched(AWTEvent event) {
            WindowEvent windowEvent = ((WindowEvent) event);
            System.out.println(System.currentTimeMillis() + " " + windowEvent);
            switch (windowEvent.getID()) {
            case WindowEvent.WINDOW_OPENED:
                System.out.println("Hiding");
                windowEvent.getComponent().setVisible(false);
                try {
                    Thread.sleep(5000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println("Showing");
                windowEvent.getComponent().setVisible(true);
                break;
            }
        }


    }, AWTEvent.WINDOW_EVENT_MASK + AWTEvent.WINDOW_STATE_EVENT_MASK);

    JOptionPane.showMessageDialog(null,
            "Eggs are not supposed to be green.",
            "Inane custom dialog",
            JOptionPane.INFORMATION_MESSAGE);
}

它产生以下输出:

1347602481337 java.awt.event.WindowEvent[WINDOW_ACTIVATED,opposite=null,oldState=0,newState=0] 
on dialog0
1347602481337 java.awt.event.WindowEvent[WINDOW_GAINED_FOCUS,opposite=null,oldState=0,newState=0] on dialog0
1347602481337 java.awt.event.WindowEvent[WINDOW_OPENED,opposite=null,oldState=0,newState=0] on dialog0
Hiding
Showing
1347602486377 java.awt.event.WindowEvent[WINDOW_LOST_FOCUS,opposite=null,oldState=0,newState=0] on dialog0
1347602486377 java.awt.event.WindowEvent[WINDOW_DEACTIVATED,opposite=null,oldState=0,newState=0] on dialog0
1347602486377 java.awt.event.WindowEvent[WINDOW_ACTIVATED,opposite=null,oldState=0,newState=0] on dialog0
1347602486377 java.awt.event.WindowEvent[WINDOW_GAINED_FOCUS,opposite=null,oldState=0,newState=0] on dialog0
1347602486377 java.awt.event.WindowEvent[WINDOW_LOST_FOCUS,opposite=null,oldState=0,newState=0] on dialog0
1347602486377 java.awt.event.WindowEvent[WINDOW_DEACTIVATED,opposite=null,oldState=0,newState=0] on dialog0
1347602486377 java.awt.event.WindowEvent[WINDOW_CLOSED,opposite=null,oldState=0,newState=0] on dialog0
1347602486377 java.awt.event.WindowEvent[WINDOW_CLOSED,opposite=null,oldState=0,newState=0] on dialog0
1347602486377 java.awt.event.WindowEvent[WINDOW_CLOSED,opposite=null,oldState=0,newState=0] on frame0

我的问题是，我做错了什么？这是每个设计还是我犯了一个错误，我是否以错误的方式使用类？如果是，正确的方法是什么？

Answer 1

你做错的是在事件调度线程上 hibernate :

windowEvent.getComponent().setVisible(false);
try {
  Thread.sleep(5000);
} catch (InterruptedException e) {
  e.printStackTrace();
}
System.out.println("Showing");
windowEvent.getComponent().setVisible(true);

通过阻止 EDT 5 秒，无法重绘任何内容。请改用 Timer。

参见 Concurrency in Swing教程以获取更多信息。