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

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Thanks Edwin - I added that to the impl, and it started working - pretty
strange that the openlayers api claims that options is not required in the
constructor, yet there are two properties, featureType and featureNS, that
are marked as required.
(
http://dev.openlayers.org/releases/OpenLayers-2.7/doc/apidocs/files/OpenLayers/Format/GML/v3-js.html)

Any ideas about how to implement the read method in VectorFeature?  I
uncommented what you had so that the body of the method now looks something
like this:

        return VectorFeature.narrowToVectorFeature(
FormatImpl.read(getJSObject(), input) );

No errors, but the feature failed to plot when I added it via
Vector.addFeature()

I then saw that the openlayers api says that GML.read() is returning an
Array of Vectors, so I tried to convert the JSObject that comes back from
FormatImpl.read() into a JSObject[].  See snippets below.

In VectorFormat.read():

        JSObject arrayObject = FormatImpl.read(getJSObject(), input);
        JSObject[] array = ElementHelper.toArray(arrayObject);
        VectorFeature[] features = new VectorFeature[array.length];
        for( int i = 0; i < array.length ; i++){
            features[i] = VectorFeature.narrowToVectorFeature(array[i]);
        }

In  ElementHelper:

    public static JSObject[] toArray(JSObject array) {
        int length = getArraySize(array);
        JSObject[] recs = new JSObject[length];
         for (int i = 0; i < length; i++) {
                recs[i] = getValueFromJavaScriptObjectArray(array, i);
         }
         return recs;
    }

    public static native JSObject getValueFromJavaScriptObjectArray(
            JSObject elem, int i) /*-{
       return elem[i];
    }-*/;

Again, no errors, but the feature failed to plot.

Again, thanks for any tips,
Brendan

On Fri, Mar 6, 2009 at 4:39 AM, Edwin Commandeur <com...@gm...
> wrote:

> Hi Brendan,
>
> As far as I can see the problem is with the GML constructor. The
> constructor needs an options object, even if it that options object is
> empty. I added an empty options object to the GMLImpl create method.
>
> Possibly it needs more. If I look at the vector-formats example than it
> might be necessary to change:
>
>     public static native JSObject create()
>     /*-{
>         return new $wnd.OpenLayers.Format.GML.v3({});
>     }-*/;
>
> to
>
>     public static native JSObject create(String type, String namespace)
>     /*-{
>         return new $wnd.OpenLayers.Format.GML.v3({ featureType : type,
> featureNS: namespace });
>     }-*/;
>
>
> Greetings,
>
> Edwin
>
> 2009/3/5 Brendan Grady <bre...@gm...>
>
>> Hi Edwin,
>>
>> An updated patch to include the DragFeature Control.
>>
>> I figured out the weirdness with KML, and that one was my fault.  It
>> appears when I added the KML to the popup, that it lost everything that had
>> special characters in it.  Makes sense because I think the Popup is supposed
>> to be just for HTML.
>>
>> However, I am pretty stumped with GML.  Everything in the code looks like
>> it should work, but the call to the empty constructor fails.  Looking at the
>> Openlayer api, any options should be optional.
>>
>>  Some more debug info:
>>
>> - new GML() fails outright with a an exception in the GWT shell output:
>>
>> GWTShell:
>>      [java] Uncaught JavaScript exception
>> [com.google.gwt.core.client.JavaScriptException: (TypeError): Object
>> expected
>>      [java]  number: -2146823281
>>      [java]  description: Object expected
>>      [java]     at
>> com.eg.gwt.openLayers.client.format.GML2Impl.create(Native Method)
>>      [java]     at
>> com.eg.gwt.openLayers.client.format.GML2.<init>(GML2.java:21)
>>
>>
>> At the moment, serializing and deserializing in GML is my most pressing
>> feature.  Hopefully, I have a breakthough before my prototype demo tomorrow.
>>
>> If you have any insight/ideas into deserialization, I would be happy to
>> try to implement them.
>>
>> Thanks Again,
>> Brendan
>>
>>
>>
>>
>> On Thu, Mar 5, 2009 at 2:35 PM, Edwin Commandeur <
>> com...@gm...> wrote:
>>
>>> Hi Brendan,
>>>
>>> Thanks for the patch. I will take look at it and already commit the css
>>> to the trunk first thing tommorow morning.
>>>
>>> If WKT works, than I'm pretty sure that KML needs some additional options
>>> that can't be specified yet. I added a Tracker on SF to track Milestone
>>> issues, which should list all the issues to be fixed for release 0.4 and
>>> getting the KML Format fully working will definitely be on the list.
>>>
>>> Greetings and thanks for all your efforts,
>>> Edwin
>>>
>>> 2009/3/5 Brendan Grady <bre...@gm...>
>>>
>>> Thanks again for the response.  I really appreciate your time.
>>>>
>>>> I'm sure you are swamped with other things, so I put together a patch
>>>> for adding controls to the EditControlPanel.  If you think it is ok, feel
>>>> free to add it to the trunk.  First time working with JSNI, so if it doesn't
>>>> follow standards, feel free to scrap it.
>>>>
>>>> The following css needs to be added to your applications css:
>>>>
>>>>        .olControlEditingToolbar  {
>>>>             width: 400px!important;
>>>>         }
>>>>         .olControlEditingToolbar .olControlSelectFeatureItemActive {
>>>>           background-image: url("img/select_feature_on.png");
>>>>           background-repeat: no-repeat;
>>>>         }
>>>>         .olControlEditingToolbar .olControlSelectFeatureItemInactive {
>>>>           background-image: url("img/select_feature_off.png");
>>>>           background-repeat: no-repeat;
>>>>         }
>>>>         .olControlEditingToolbar .olControlModifyFeatureItemActive {
>>>>           background-image: url("img/move_vertex_on.png");
>>>>           background-repeat: no-repeat;
>>>>         }
>>>>         .olControlEditingToolbar .olControlModifyFeatureItemInactive {
>>>>           background-image: url("img/move_vertex_off.png");
>>>>           background-repeat: no-repeat;
>>>>         }
>>>>         .olControlEditingToolbar .olControlDragFeatureItemActive {
>>>>           background-image:
>>>> url("openlayers/theme/default/img/move_feature_on.png");
>>>>           background-repeat: no-repeat;
>>>>         }
>>>>         .olControlEditingToolbar .olControlDragFeatureItemInactive {
>>>>           background-image:
>>>> url("openlayers/theme/default/img/move_feature_off.png");
>>>>           background-repeat: no-repeat;
>>>>         }
>>>>
>>>> If you can't find the images, I can provide those too.  As a zip maybe?
>>>>
>>>> I'm also going to take a look at the GML2,3 / KML
>>>> serializer/deserializer.  Those seem to be broken right now, though WKT
>>>> serialize does seem to work, so I'll use that as a guideline.
>>>>
>>>> Brendan
>>>>
>>>>
>>>>
>>>> On Thu, Mar 5, 2009 at 8:53 AM, Brendan Grady <bre...@gm...>wrote:
>>>>
>>>>> 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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>>>>>>> Francisco, CA
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>>>>>>> _______________________________________________
>>>>>>> Gwt-openlayers-users mailing list
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>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>> ------------------------------------------------------------------------------
>>>>>> 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...
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>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>

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

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