Alex,

I got this message when I submitted it: Your suggested bug-fix has been
assigned an internal review ID of: 1070487

As for the rest of the email, I'm still investigating. However, I've discovered that the JPopupMenu's parent is set to null when I call getRootPane from a JMenuItem, but it has a parent when I call it from a JButton. I don't know where it's value gets set yet, but I'm investigating.

-- Miguel Mu?oz

*/Alexander Potochkin <Alexander.Potochkin at Sun.COM>/* wrote:

Hello Miguel

> http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6499857 > > I submitted a fix.

Sorry, I can't find the fix

How did you submit it ?

> The fix works for JMenuItems, but when I look at the > documentation, I see that other components may also be added to JMenus, > and the fix won't work for them. But after experimenting, I discovered > that, if I add a JButton to a JMenu, the bug doesn't show up. So the bug > only affects JMenuItems that are added to a JMenu. > > This raises an interesting question. Is there a better fix for this? > Right now, JMenuItems are added to menus through a special mechanism, > and other JComponents are added through the standard mechanism, but they > both work as menu items.

Do you mean JMenu.add(JMenuItem) comparing with JMenu.add(JComponent) ?

Their implementation looks almost identical

> Furthermore, getRootPane() works for items > added through the standard mechanism. This raises an obvious question: > Would JMenuItems work fine if added through the standard mechanism? If > so, that would be a better fix, and here's why: > > There are a few related bugs. For example, bug 4231737 (which has the > mysterious designation of RFE) is caused by > JOptionPane.getWindowForComponent(Component parentComponent), which > calls itself recursively like this: > > return JOptionPane.getWindowForComponent(parentComponent.getParent()) > > (with other code to end this cycle cleanly.) > > Looping on parent.getParent() is a common thing to do, and shows up in > these four methods in SwingUtilities: > > Window getWindowAncestor(Component c) > Window windowForComponent(Component c) > Component getRoot(Component c) > JRootPane getRootPane(Component c) > > I'm sure a few developers have also written this loop. And all of these > fail for JMenuItems for the same reason getRootPane() fails. > > So I am currently investigating why getRootPane() works for a JButton > added to a menu, and I'm looking at how hard it will be to make > JMenuItems work through the standard mechanism instead of the custom > one. (I realize this is probably a long shot.) If that works, it would > be a better fix, because it would fix all four of the methods above, as > well as every individual developer's parent=parent.getParent() loop.

It would be really great to investigate all of that questions

Thanks alexp

> > -- Miguel > > > */Alexander Potochkin /* wrote: > > Hello Miguel > > > The problem is simple. The getRootPane() method calls > > SwingUtilities.getRootPane(Component c). That method loops on a > call to > > getParent, like this: > > > > for( ; c != null; c = c.getParent()) { > > if (c instanceof JRootPane) { > > return (JRootPane)c; > > } > > } > > > > The trouble is that anything placed on a menu doesn't belong to the > > standard hierarchy. JMenus use a JPopupMenu, and JPopupMenus > don't have > > a parent, they have an invoker. > > > > An obvious fix would be to override getParent() in JPopupMenu to > call > > getInvoker() and return that. This doesn't work. The getInvoker() > method > > returns a Component, but getParent() returns a Container. I can work > > around this, but it breaks the menu code. > > > > The fix is to complicate the loop on c = c.getParent(), by > checking for > > JMenuItems and handling them differently. This slows the loop > down, so I > > don't want to do that in Swing Utilities, because there's no need > for > > the more complicated loop for most components. Instead, I plan to > > override getRootPane() in JMenuItem. > > This sounds like a good idea > > > > > This is complicated by the fact that not all JMenuItems are broken. > > JMenus are subclasses of JMenuItem, and they have a valid parent > (unless > > they're a submenu). But that should be easy to work around. > > > > I'll have some code in a day or two. I'll include a test program. > Are > > there any constraints I should know about for the test program? > > We use jtreg harness for our regression tests > > http://openjdk.java.net/jtreg/index.html > > It might look a bit messy, > but actually it's quite simple to write a test with jtreg > > In your case, I imagine, you'd check JMenuItem.getRootPane() > and throw RuntimeException if it is null just like with JUnit > > > Thanks > alexp > > > > > -- Miguel Mu???oz > > > > > > On Sep 20, 2007, at 6:55 AM, Alexander Potochkin wrote: > > > >> Hello Miguel > >> > >>> I plan to fix bug 6499857. There are a couple of approaches, but I > >>> think I know the best way to fix it. Has anybody else looked at > this? > >> > >> Currently no one works on this fix > >> so you are welcome to start with it ! > >> > >> Thanks > >> alexp > >> > >>> -- Miguel Mu???oz > >>> ___________________ > >>> There are 10 kinds of people: Those who know binary and those > who don't. > >> > > > > ___________________ > > > > There are 10 kinds of people: Those who know binary and those who > don't. > > > > > >