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

[Edwin C. <com...@gm...>]

Hi Brendan,

Great that SelectFeature works fine.

The problem with the KML format I will have to look into. Currently the
Format support in GWT-OpenLayers is still limited. KML inherits it's write
functionality from VectorFormat, but perhaps it's necessary to specify write
options for KML that I was unaware of to.

WKT should work. If that gives strange output to than sth else is going on.

Greetings,
Edwin


2009/3/5 Brendan Grady <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
>>>
>>>
>>> ------------------------------------------------------------------------------
>>> Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco,
>>> CA
>>> -OSBC tackles the biggest issue in open source: Open Sourcing the
>>> Enterprise
>>> -Strategies to boost innovation and cut costs with open source
>>> participation
>>> -Receive a $600 discount off the registration fee with the source code:
>>> SFAD
>>> http://p.sf.net/sfu/XcvMzF8H
>>> _______________________________________________
>>> Gwt-openlayers-users mailing list
>>> Gwt...@li...
>>> https://lists.sourceforge.net/lists/listinfo/gwt-openlayers-users
>>>
>>>
>>
>>
>> ------------------------------------------------------------------------------
>> Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco,
>> CA
>> -OSBC tackles the biggest issue in open source: Open Sourcing the
>> Enterprise
>> -Strategies to boost innovation and cut costs with open source
>> participation
>> -Receive a $600 discount off the registration fee with the source code:
>> SFAD
>> http://p.sf.net/sfu/XcvMzF8H
>> _______________________________________________
>> Gwt-openlayers-users mailing list
>> Gwt...@li...
>> https://lists.sourceforge.net/lists/listinfo/gwt-openlayers-users
>>
>>
>