Re: [Gwt-openlayers-users] Adding a Listener to a Vector Layer

[Brendan G. <bre...@gm...>]

Hi Edwin -

The SelectFeature appears to be working perfectly.  Thanks!

Implementing the editing features that are in
http://crschmidt.net/mapping/wpserverdemo/  would make for a very powerful
toolset.  I would be happy to test out whatever you have.

As an aside, this is how I tested out the Select Feauture:

        SelectFeatureOptions options = new SelectFeatureOptions();
        options.onSelect( new SelectFeature.SelectFeatureListener(){

            public void onFeatureSelected(JSObject vectorFeature) {
                VectorFeature overlay =
VectorFeature.narrowToVectorFeature(vectorFeature);
                popup = new AnchoredBubble("vector-info",
                        new LonLat(0,0),
                        new Size(300, 400),
                        "<p>" + new KML().write(overlay) + "</p>",
                        new Icon("", new Size(0, 0), new Pixel(0, 0)),
                        true);
                map.addPopup(popup);
            }

        });

For some reason though, the info that popped up is not KML.  It looks more
like this:

OpenLayers exportExported on Thu Mar 5 08:49:56
EST2009OpenLayers.Feature.Vector_262No description available-0.0703125,
2.4609375 -0.703125,-20.390625 ...

Am I using the KML exporter incorrectly?

Thanks again,

Brendan


On Thu, Mar 5, 2009 at 5:43 AM, Edwin Commandeur <com...@gm...
> wrote:

> Hi there,
>
> Selecting features happens with a control in OpenLayers. I saw in the
> GWT-OpenLayers codebase that we are not yet wrapping the SelectFeature
> control. By default the SelectFeature selects features on click and you can
> pass it options to select on hover.
>
> So:
> (1) we need to add support for the select feature control => ADDED 5 min
> ago
>
> I added a wrapper for SelectFeature, but did not thoroughly test it...
> Maybe you can try it out.
>
> One caveat: The onSelect and onUnselect callback methods do not hook in
> with the broader OpenLayers event system. By the latter I mean that for
> example Vector (a vector layer object) has an Event object to register and
> unregister events, while the onSelect and onUnselect are just callback
> methods of the Control. This is why I added the Listener interfaces to the
> Control itself and this is why the methods onSelectFeature and
> onUnselectFeature return a JSObject which is a VectorFeature that you have
> to narrow to a VectorFeature yourself inside the method e.g.
> new SelectFeatureListener(){
>             public void onSelectFeature(JSObject vectorFeature) {
>                  VectorFeature vf =
> VectorFeature.narrowToVectorFeature(vectorFeature);
>    }
>
> (2) you then need to add a button to activate the SelectFeature control
> (and deactivate the other editing controls).
>
> Point (2) could be realised in two ways: (a) you should create your own
> editing toolbar using GWT (b) we could support adding controls to the
> Editing Toolbar. Option 2b is not yet in OpenLayers, but would not be very
> difficult to support this in GWT-OpenLayers. I guess that most people want
> an editing toolbar like this one:
>
> http://crschmidt.net/mapping/wpserverdemo/
>
> I will look into point 2b shortly, but cannot promise to have anything
> ready overnight.
>
> Greetings,
> Edwin
>
> 2009/3/4 Brendan Grady <bre...@gm...>
>
>> Hello,
>>
>>
>> New user to gwt-openlayers.
>>
>> Does anyone have an example of adding a "select" listener to a Vector
>> layer?  I am adding vectors using the Editing Toolbar.
>>
>> In openlayers, I would add something like the following:
>>
>>   selectControl = new OpenLayers.Control.SelectFeature(overlayLayer,
>>                 {onSelect: onFeatureSelect, onUnselect: onFeatureUnselect});
>>
>>
>> I tried the following, but I think I need to add something else to the map
>> to make the layer "selectable" as it does not seem to register that I am
>> over a selectable vector:
>>
>> <snip>
>>         Vector overlayLayer = new Vector("Overlay Creation Layer");
>>         map.addLayer(overlayLayer);
>>         map.addControl(new EditingToolbar(overlayLayer));
>>
>>         overlayLayer.addVectorFeatureSelectedListener( new
>> VectorFeatureSelectedListener(){
>>
>>             public void onFeatureSelected(Vector source,
>>                     FeatureSelectedEvent eventObject) {
>>                 VectorFeature overlay = eventObject.getFeature();
>>                 popup = new AnchoredBubble("vector-info",
>>                         new LonLat(0,0),
>>                         new Size(300, 400),
>>                         "<p>" + new KML().write(overlay) + "</p>",
>>                         new Icon("", new Size(0, 0), new Pixel(0, 0)),
>>                         true);
>>                 map.addPopup(popup);
>>             }
>>
>>         });
>> </snip>
>>
>> Any suggestions?
>>
>> Thanks,
>> Brendan
>>
>>
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>
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