Java/Swing: Obtain Window/JFrame from inside a JPanel
Solution 1
You could use SwingUtilities.getWindowAncestor(...)
method that will return a Window that you could cast to your top level type.
JFrame topFrame = (JFrame) SwingUtilities.getWindowAncestor(this);
Solution 2
There are 2 direct, different methods for this in SwingUtilities
which provide the same functionality (as noted in their Javadoc). They return java.awt.Window
but if you added your panel to a JFrame
, you can safely cast it to JFrame
.
The 2 direct and most simple ways:
JFrame f1 = (JFrame) SwingUtilities.windowForComponent(comp);
JFrame f2 = (JFrame) SwingUtilities.getWindowAncestor(comp);
For completeness some other ways:
JFrame f3 = (JFrame) SwingUtilities.getAncestorOfClass(JFrame.class, comp);
JFrame f4 = (JFrame) SwingUtilities.getRoot(comp);
JFrame f5 = (JFrame) SwingUtilities.getRootPane(comp).getParent();
Solution 3
JFrame frame = (JFrame)SwingUtilities.getRoot(x);
Solution 4
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 f3
by icza in https://stackoverflow.com/a/25137298/1184842
JFrame f3 = (JFrame) SwingUtilities.getAncestorOfClass(JFrame.class, comp);
because this is a valid and safe cast and nearly as simple as all other answers.
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scravy
Updated on July 05, 2022Comments
-
scravy almost 2 years
How can I get the JFrame in which a JPanel is living?
My current solution is to ask the panel for it's parent (and so on) until I find a Window:
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?
-
icza almost 10 yearsJavadoc states that this might be an
Applet
(notWindow
orFrame
). -
user64141 about 4 yearsThat worked. You know much that is hidden, O Hovercraft Full Of Eels.