如何模拟一个模式对话框从applet中？ [英] How do I simulate a modal dialog from within an Applet?

问题描述

在调用setVisible（真），我请拨打以下code以启动一个模态对话框：

On setVisible(true), I call the following code to start a modal dialog:

private synchronized void startModal () {
  try {
    if (SwingUtilities.isEventDispatchThread()) {
      EventQueue theQueue = getToolkit().getSystemEventQueue();
      while (isVisible()) {
        AWTEvent event = theQueue.getNextEvent();
        Object source = event.getSource();
        if (event instanceof ActiveEvent) {
          ((ActiveEvent) event).dispatch();
        } else if (source instanceof Component) {
          ((Component) source).dispatchEvent(event);
        } else if (source instanceof MenuComponent) {
          ((MenuComponent) source).dispatchEvent(event);
        } else {
          System.err.println("Unable to dispatch: " + event);
        }
      }
    } else {
      while (isVisible()) {
        wait();
      }
    }
  } catch (InterruptedException ignored) { }
}

这在大多数的浏览器好了。但是，Opera和Safari for Windows中，我面临着以下大讨厌的异常：

This works just great in most browsers. However, in Opera and Safari for Windows, I am confronted with the following big-nasty-exception:

java.security.AccessControlException: access denied (java.awt.AWTPermission accessEventQueue)
    at java.security.AccessControlContext.checkPermission(Unknown Source)
    at java.security.AccessController.checkPermission(Unknown Source)
    at java.lang.SecurityManager.checkPermission(Unknown Source)
    at java.lang.SecurityManager.checkAwtEventQueueAccess(Unknown Source)
    at java.awt.Toolkit.getSystemEventQueue(Unknown Source)

有没有在这些浏览器生成假模态对话框的变通方法？

Is there a workaround for generating fake-modal dialogs in these browsers?

推荐答案

具有歌剧院有问题可能是歌剧有命名为opera.policy自己的java.policy文件（下Opera_installation_directory \\ classes文件夹）的原因。虽然，在我的Opera安装，我看不出是不是在Opera批准，但批准在默认的java.policy文件许可。

The reason of having a problem with Opera might be that Opera has its own java.policy file named as opera.policy (under Opera_installation_directory\classes folder). Though, in my Opera installation, I couldn't see any permission that is not granted in Opera but granted in the default java.policy file.

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