Java/Swing：从 JPanel 内部获取 Window/JFrame
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原文地址: http://stackoverflow.com/questions/9650874/
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Java/Swing: Obtain Window/JFrame from inside a JPanel
提问by scravy
How can I get the JFrame in which a JPanel is living?
如何获得 JPanel 所在的 JFrame？
My current solution is to ask the panel for it's parent (and so on) until I find a Window:
我目前的解决方案是向面板询问它的父级（等等），直到我找到一个窗口：
Container parent = this; // this is a JPanel
do {
parent = parent.getParent();
} while (!(parent instanceof Window) && parent != null);
if (parent != null) {
// found a parent Window
}
Is there a more elegant way, a method in the Standard Library may be?
有没有更优雅的方法，标准库中的方法可能是？
采纳答案by Hovercraft Full Of Eels
You could use SwingUtilities.getWindowAncestor(...)method that will return a Window that you could cast to your top level type.
您可以使用SwingUtilities.getWindowAncestor(...)将返回一个可以转换为顶级类型的 Window 的方法。
JFrame topFrame = (JFrame) SwingUtilities.getWindowAncestor(this);
回答by Ismael Abreu
JFrame frame = (JFrame)SwingUtilities.getRoot(x);
回答by icza
There are 2 direct, different methods for this in SwingUtilitieswhich provide the same functionality (as noted in their Javadoc). They return java.awt.Windowbut if you added your panel to a JFrame, you can safely cast it to JFrame.
有两种直接的、不同的方法SwingUtilities可以提供相同的功能（如他们的 Javadoc 中所述）。它们会返回，java.awt.Window但如果您将面板添加到 a JFrame，则可以安全地将其投射到JFrame.
The 2 direct and most simple ways:
2种直接和最简单的方法：
JFrame f1 = (JFrame) SwingUtilities.windowForComponent(comp);
JFrame f2 = (JFrame) SwingUtilities.getWindowAncestor(comp);
For completeness some other ways:
为了完整起见，还有一些其他方式：
JFrame f3 = (JFrame) SwingUtilities.getAncestorOfClass(JFrame.class, comp);
JFrame f4 = (JFrame) SwingUtilities.getRoot(comp);
JFrame f5 = (JFrame) SwingUtilities.getRootPane(comp).getParent();
回答by jan
As other commentators already mentioned it is not generally valid to simply cast to JFrame. That does work in most special cases, but I think the only correct answer is f3by icza in https://stackoverflow.com/a/25137298/1184842
正如其他评论员已经提到的那样，简单地强制转换为JFrame. 这在大多数特殊情况下都有效，但我认为唯一正确的答案是https://stackoverflow.com/a/25137298/1184842 中f3的 icza
JFrame f3 = (JFrame) SwingUtilities.getAncestorOfClass(JFrame.class, comp);
because this is a valid and safe cast and nearly as simple as all other answers.
因为这是一个有效且安全的转换，几乎与所有其他答案一样简单。
