It is a little clearer now, couple of things were no correct in my
code and it took a while to get everything a little more straight.
I performed the following : click on an openLayers point to launch
java function. It works like that :
First, my native Js function largely inspired by Openlayers example
page :
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
private static native JavaScriptObject _select(JavaScriptObject map,
JavaScriptObject layer,VectorLayer x)
/*-{
var mylayer=layer
function select(feature)
{
[email protected]::selected
(Lcom/google/gwt/core/client/JavaScriptObject;)(feature.attributes[0])
}
var drawControl=new $wnd.OpenLayers.Control.SelectFeature
(
mylayer,
{
clickout: true,
toggle: true,
multiple: true,
hover: false,
toggleKey: "ctrlKey", // ctrl key removes from
selection
multipleKey: "shiftKey", // shift key adds to
selection
box: true,
onSelect:select
}
);
map.addControl(drawControl);
drawControl.activate();
}-*/;
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Note that :
Those three objects are passed JavaScriptObject map, JavaScriptObject
layer,VectorLayer x (VectorLayer is the self reference of the class :
this)
The path to the class in JSNI context is :
[email protected]
To adress a function in my class :
[email protected]::selected()()
On 10 mar, 15:26, Gilles <[email protected]> wrote:
> We are using GWT andOpenLayersin several projects making use of theJSNI.
> Until now we could use simpleOpenlayersjs function such as Zoom. It
> was clear to me that to use a zoom usingJSNII have to do :
>
> private static native void _zoomTo(JavaScriptObject map, int
> zoomLevel) /*-{
> map.zoomTo(zoomLevel);
> }-*/;
>
> I could do a lot with this simple methods. But now, as complexity is
> increasing I would need to use more complex feature ofOpenlayers.
> For example what would be the smartest way to apply those settings to
> my map so I can detect double click and get the event to my gwt
> application :
>
> <script src="../OpenLayers.js"></script>
> <script type="text/javascript">
> OpenLayers.Control.Click =OpenLayers.Class
> (OpenLayers.Control, {
> defaultHandlerOptions: {
> 'single': false,
> 'double': true,
> 'pixelTolerance': 0,
> 'stopSingle': false,
> 'stopDouble': false
> },
>
> initialize: function(options) {
> this.handlerOptions =OpenLayers.Util.extend(
> {}, this.defaultHandlerOptions
> );
> OpenLayers.Control.prototype.initialize.apply(
> this, arguments
> );
> this.handler = newOpenLayers.Handler.Click(
> this, {
> 'click': this.trigger
> }, this.handlerOptions
> );
> },
>
> trigger: function(e) {
> var lonlat = map.getLonLatFromViewPortPx(e.xy);
> alert("You clicked near " + lonlat.lat + " N, " +
> + lonlat.lon + " E");
> }
>
> });
>
> var map;
>
> function init(){
> map = newOpenLayers.Map('map');
>
> var click = newOpenLayers.Control.Click();
> map.addControl(click);
> }
> </script>
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