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Re: [Gwt-openlayers-users] Adding Map Event Handlers ...
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From: Edwin C. <com...@gm...> - 2009-10-05 11:39:06
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Hi Ken,
It sounds reasonable that you want to keep all non standard stuff separate.
If you would like to contribute a click handler that would be very
welcome. From your code it seems a click control is not even
necessary.
The click handler should be an abstract class with empty callback
functions, that can be overridden in an anonymous instance of the
click handler. For example:
abstract class ClickHandler extends JSObjectWrapper(){
//override
public void onClick(ClickEventObject obj){};
}
Then it needs to be instantiated like:
new ClickHandler(){
public void onClick(){
//do sth here
}
}
The javascript code would have to make a new javascript click handler
that calls the empty callback methods on the abstract java click
handler.
That would be the first solution that would come to mind.
If you would like to contribute a click handler or other such
solution, then you would be more than welcome. I will not have time to
work on it in the very near future.
Greetings,
Edwin
2009/10/5 Ken Needham <ke...@ke...>
> I have numerous changes to make to a (rather over complicated) GIS
> application
> The policy has been to leave the GWT-OpenLayers code untouched and to create
> yet another layer on top in which we handle all the non-standard stuff.
> In this case do you think I would be useful for me to add a new handler into
> the GWT-OpenLayer code?
>
> The pure OL JavaScript approach is as follows:
>
> <html>
> <head>
> <script type="text/javascript"
> src="http://openlayers.org/api/OpenLayers.js"></script>
> </head>
> <body onload="loadmap();">
> <script type="text/javascript">
>
> function centre(evt, map){
> var newCenter = map.getLonLatFromViewPortPx( evt.xy );
> map.setCenter(newCenter);
> }
> function loadmap(){
> //basic setup
> var map = new OpenLayers.Map('map');
> var wms = new OpenLayers.Layer.WMS( "OpenLayers WMS",
> "http://labs.metacarta.com/wms/vmap0", {layers: 'basic'} );
> map.addLayer(wms);
> if (!map.getCenter()) map.zoomToMaxExtent();
>
> //Create handler
> var dblclick = new OpenLayers.Handler.Click(this, {
> dblclick:function(evt) { centre(evt, map); } },
> {'double': true,
> stopDouble: true});
>
> //Fix up the missing map reference
> dblclick.setMap(map);
>
> //Activate in correct order
> dblclick.activate();
> }
> </script>
>
> <div style="width:1000px; height:500px; border: 1px blue solid;"
> id="map"></div>
> <div id="eventlog"></div>
> </body>
> </html>
>
> Ken
>
>
>
>
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