如何从 Applet 中模拟模态对话框? [英] How do I simulate a modal dialog from within an Applet?

问题描述

在 setVisible(true) 上，我调用以下代码来启动模态对话框:

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) { }
}

这在大多数浏览器中都很好用.但是，在 Windows 的 Opera 和 Safari 中，我遇到了以下令人讨厌的异常:

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)

是否有在这些浏览器中生成假模态对话框的解决方法?

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

推荐答案

Opera 出现问题的原因可能是Opera 有自己的java.policy 文件，名为opera.policy(在Opera_installation_directory\classes 文件夹下).但是，在我的 Opera 安装中，我看不到任何未在 Opera 中授予但在默认 java.policy 文件中授予的权限.

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.

这篇关于如何从 Applet 中模拟模态对话框?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！