java - swing jpopupmenu 和 jpanel 正在显示阴影

Question

我的 jcomponent 菜单有问题。菜单工作正常，但当菜单关闭到父面板中时，仍会留下阴影(灰色)，其大小与 jpopup 菜单相同。 我不得不提一下，jpopup 菜单的父级 jpanel 具有上面提到的颜色，但透明度设置为 25%。

Answer 1

I have to mention that the jpanel that is the parent of the jpopup menu has the color mentioned above but has the transparency set to 25%.

参见Background With Transparency针对可能出现的问题以及一些解决方案。