JOptionPane.showOptionDialog 并不总是在 Applet 中移动到前面
我的小程序中通常有一个 JOptionPane 弹出窗口，a-la:
Object[] options = {"Grade", "Save", "Cancel"};
selection = JOptionPane.showOptionDialog(this,
"Do you want to grade now or save your work to continue later?",
"Grade Or Save",
JOptionPane.DEFAULT_OPTION,
JOptionPane.QUESTION_MESSAGE,
null,
options,
options[2]);
this 指的是 JApplet 对象。
弹出窗口工作正常，一切正常，但有时它会出现在小程序后面，而不是弹出在小程序前面。
I have a JOptionPane popup in my applet normally, a-la:
Object[] options = {"Grade", "Save", "Cancel"};
selection = JOptionPane.showOptionDialog(this,
"Do you want to grade now or save your work to continue later?",
"Grade Or Save",
JOptionPane.DEFAULT_OPTION,
JOptionPane.QUESTION_MESSAGE,
null,
options,
options[2]);
this refers to the JApplet object.
The popup works fine and everything, but occasionally it will appear behind the applet instead of popping up in front of it.
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不知不觉中，您可能不会传入父组件；特别是“this”进入showOptionDialog()。确保“this”实际上是父组件。
如果“this”指的是一个框架，您可以通过执行以下操作找到焦点所在的框架：（
伪代码）
myFrames[] = Frame.getFrames();
if ( myFrames[i].isFocused() )
要传入的框架:)
Unknowingly you not may be passing in the parent component; specifically "this" into the showOptionDialog(). Make sure "this" is actually the parent component.
If "this" refers to a Frame you can find what frame is in focus by doing the following:
(pseduo code)
myFrames[] = Frame.getFrames();
if ( myFrames[i].isFocused() )
frame to pass in :)
要做的事情是找到作为框架（它是隐藏的、插件特定类型）的小程序的父级，并使用该框架作为对话框所有者。您可以发现使用
(Frame)SwingUtilities.getAncestorOfClass(java.awt.Frame.class, theApplet);这将确保对话框保留在浏览器顶部。但是，如果用户切换浏览器选项卡，该对话框不会隐藏。
The thing to do is find the parent of the applet that is a Frame (it's of a hidden, plugin specific type) and use that frame as the dialog owner. You can find that with
(Frame)SwingUtilities.getAncestorOfClass(java.awt.Frame.class, theApplet);That will ensure the dialog remains on top of the browser. However, if the user switches browser tabs, the dialog doesn't hide.