1

我想要实现的是

  • 在某种状态下，一个类应该自动隐藏其他类显示的对话框
  • 当程序状态发生变化时，应显示隐藏的对话框

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，所以我只在几秒钟内再次看到它们

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错误，我是否以错误的方式使用这些类？如果是，正确的方法是什么？

4

1 回答 1

3

你做错的是在事件调度线程上睡觉：

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

通过阻塞 EDT 5 秒，没有任何东西可以重新绘制。改用 a Timer。

有关更多信息，请参阅Swing 中的并发教程。

于 2012-09-14T06:12:32.690 回答