This was reported in October 2006 - see
http://code.google.com/p/google-web-toolkit/issues/detail?id=262
It's still 'planned for somewhen' :-(
Ian
2008/8/25 Dean S. Jones <[EMAIL PROTECTED]>
>
> this is not a threading problem
>
> add 4 ClickListeners to a button, have each alert it's number, 1, 2,
> 3, 4... on ClickListener 2, remove the listener for 2... the next
> listener that fires is 4... the ArrayList is slid down, but the
> iterator is still incremented, missing #3.
>
> On Aug 24, 4:00 am, "Nicolas Wetzel" <[EMAIL PROTECTED]> wrote:
> > Hi
> > dont' forget that javascript execution is monothread . I' not sure the
> > trouble you describe could happen. did you check it ?
> > Nicolas W
> >
> > On Sun, Aug 24, 2008 at 8:10 AM, Dean S. Jones <[EMAIL PROTECTED]>
> wrote:
> >
> >
> >
> > > I have posted about this before, but it keeps coming back to bite me,
> > > or ... not me, but people on my projects. It needs to be addressed...
> > > This issue is widespread in GWT, and also in many other frameworks.
> >
> > > Imagine ClickListener in Button/ButtonBase/ClickListenerCollection, is
> > > an ArrayList. IF, while during dispatch, a component removes, or adds
> > > a ClickListener to the ArrayList of Listeners... The Iterator
> > > generally used will malfunction: depending on the order of
> > > registration, or the order of execution, one listener will be skipped
> > > ( in the case of remove, as the list is "slidded" down" or missed, as
> > > the list is expanded to add a new Listener, it will fire... ). The
> > > only SANE conclusion I can imagine is to CLONE or copy the listener
> > > list at dispatch:
> >
> > > public Iterator<L> iterator()
> > > {
> > > ArrayList<L> temp = new ArrayList<L>(this.m_listeners);
> >
> > > return temp.iterator();
> > > }
> >
> > > one line of code would fix this problem. It may seem like an edge
> > > case, but it comes up more than I would imagine.
> >
>
--
Ian
http://examples.roughian.com
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