Hi Stephane,
Thanks for the heads-up, I'll take a look at it. I was able to
reproduce what you're seeing.
- Don
On Oct 9, 2006, at 12:57 PM, Stéphane Wasserhardt wrote:
> Hello list !
>
> I don't know if this happens only with the current CVS version of
> OpenMap, but the overview map doesn't work anymore.
> In fact, it works only the first time it is used. When you close
> it, it is removed from the mapBean's WindowSupport listeners, and
> does not work anymore.
> I have found the reason, but I don't know how it should be avoided...
> So, the reason is the following :
> In the OverviewMapHandler class, there are these two methods :
>
> public void componentShown(ComponentEvent e) {
> if (sourceMap != null) {
> sourceMap.addProjectionListener(this);
> }
> }
>
> public void componentHidden(ComponentEvent e) {
> if (sourceMap != null) {
> sourceMap.removeProjectionListener(this);
> }
> }
>
> So that when the overview is not displayed, it doesn"t recieve any
> projectionEvents. That's ok.
> These methods are called by the overview's WindowSupport (class
> member).
> Here is the code (in WindowSupport) that calls componentHidden (in
> OverviewMapHandler) :
>
> public void componentHidden(ComponentEvent e) {
> Iterator it = iterator();
> while (it.hasNext()) {
> ((ComponentListener) it.next()).componentHidden(e);
> }
>
> // We need to do this after componentHidden notifications,
> // otherwise the component never finds out it's been hidden,
> // it gets removed as a ComponentListener at cleanup.
> Component source = (Component) e.getSource();
> if (display == source) {
> cleanUp();
> }
> }
>
> The overview is a WindowSupport's listener, so the componentHidden
> call is forwarded to it.
> But after the overview map is hidden, you can see that the
> 'cleanUp' method is also called.
> During this cleanUp, the OverviewMapHandler is removed from the
> WindowSupport's listeners !
> That is the issue !
> When you open up the overview for the second time, the
> componentShown call on the WindowSupport is not forwarded to the
> overview !
> So the overview cannot be restored as a projectionListener, and
> becomes semi-inactive : it sends the projectionChange events to the
> main application's mapBean, but isn't refreshed when the mapBean's
> projection changes !
>
> I don't know what is the right way to avoid this behaviour. What is
> different from previous openMap releases ? (Or maybe this issue has
> always been here !)
> Thanks in advance for your help !
>
> Stephane
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=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Don Dietrick, dietrick_at_bbn.com
BBN Technologies, Cambridge, MA
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
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Received on Tue Oct 10 2006 - 11:54:34 EDT