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JPanel-type class doesn't apear on the JFrame?
I created a class named Surface the inherites from JPanel. This class draws a General Path inside it's paintComponent(). I tried adding it to a JFrame and it doesn't get displayed.
Then I was advised to give the Surface instance a preferredSize, and it now displays correctly.
My question is: Is the default for JPanel-type objects that only have a GeneralPath in their paintComponent() (no rectangles and other shapes), to be invisible until you explicitly set their preferred size?
Thanks
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Re: JPanel-type class doesn't apear on the JFrame?
No.
Please show the code that wasn't working correctly so that we can determine the reason.
Re: JPanel-type class doesn't apear on the JFrame?
Not exactly. The size (and location) of a component depends on the container in which you add the component:Originally Posted by AvivC
a) if the container uses a layout manager or not.
and
b) if there is a layout manager, in which area (depending on the specific layout manager).
For example, if a container has a BorderLayout and you put a component in the CENTER area, then any set of the preferred size is totally ignored.
Andrea, www.andbin.net — SCJP 5 (91%) – SCWCD 5 (94%)
Useful links for Java beginners – My new project Java Examples on Google Code
Re: JPanel-type class doesn't apear on the JFrame?
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