选中其中的复选框时，如何防止JPopUpMenu消失?

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问题描述

我想在JPopupMenu中使用JCheckBoxMenuItem.它的工作原理，但问题是，当一个复选框项目已被选中或取消选中弹出菜单中消失.因此，如果要选中/取消选中多个项目，则需要反复启动弹出窗口，这很烦人.

I want to use JCheckBoxMenuItems in a JPopupMenu. It works, but the problem is that the popup menu disappears when a checkbox item has been checked or unchecked. So if one wants to check/uncheck several items, the popup needs to be launched repeatedly, which is irritating.

奇怪的是，如果我在菜单中仅使用普通的JCheckBox项(而不是JCheckBoxMenuItem s)，则其行为应为应有的状态:弹出窗口停留在该位置，并且可以选中/取消选中复选框.完成后，只需在其外部单击即可关闭弹出窗口.

Curiously, if I use just plain JCheckBox items in the menu (instead of JCheckBoxMenuItems), the behavior is just as it should be: the popup stays there and the checkboxes can be checked/unchecked. Once done, the popup can be closed just by clicking outside it.

当项为JCheckBoxMenuItem时，如何使弹出窗口具有类似的行为?由于它们的外观，我更喜欢使用JCheckBoxMenuItem.

How do I make the popup to behave like that when the items there are JCheckBoxMenuItems? I would prefer using JCheckBoxMenuItems because of their looks.

推荐答案

好，从 http://forums.sun.com/thread.jspa?threadID=5432911 .基本上，创建一个自定义UI:

Well, found working answer from http://forums.sun.com/thread.jspa?threadID=5432911. Basically, create a custom UI:

public class StayOpenCheckBoxMenuItemUI extends BasicCheckBoxMenuItemUI {

   @Override
   protected void doClick(MenuSelectionManager msm) {
      menuItem.doClick(0);
   }

   public static ComponentUI createUI(JComponent c) {
      return new StayOpenCheckBoxMenuItemUI();
   }
}

并在JCheckBoxMenuItem中进行设置:

myJCheckBoxMenuItem.setUI(new StayOpenCheckBoxMenuItemUI());

不知道这是否是最优雅的解决方案，但是效果很好.

Don't know if this is the most elegant possible solution, but works perfectly.

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