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Re: [Gwt-openlayers-users] Handler Hover (Control), how?
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From: Andrew H. <ahh...@gm...> - 2010-11-03 23:23:01
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Getting close but not yet, I think my native javascript is fundementally
flawed... says "OpenLayers is undefined".... perhaps I am missing some
$wnd.* somewhere :'( Any idea's? Sorry to bug people...
------------------------------------------------------------------------------------
public class HoverControl extends Control {
public interface HoverControlListener {
void onPause(JSObject evt);
void onMove(JSObject evt);
}
protected HoverControl(JSObject element) {
super(element);
}
public HoverControl(HoverControlListener listener) {
this(HoverControlImpl.create(listener));
}
public static HoverControl narrowToHoverControl(JSObject element) {
return (element == null) ? null: new HoverControl(element);
}
}
------------------------------------------------------------------------------------
class HoverControlImpl {
public static native JSObject create(HoverControl.HoverControlListener
callback) /*-{
OpenLayers.Control.Hover = OpenLayers.Class(OpenLayers.Control, {
defaultHandlerOptions: {
'delay': 500,
'pixelTolerance': null,
'stopMove': false
},
initialize: function(options) {
this.handlerOptions = OpenLayers.Util.extend(
{}, this.defaultHandlerOptions
);
OpenLayers.Control.prototype.initialize.apply(
this, arguments
);
this.handler = new OpenLayers.Handler.Hover(
this,
{'pause': this.onPause, 'move': this.onMove},
this.handlerOptions
);
},
onPause: function(evt) {
callback.@com.acme.client.hover.HoverControl.HoverControlListener
::onPause(Lorg/gwtopenmaps/openlayers/client/util/JSObject;)(evt);
},
onMove: function(evt) {
callback.@com.acme.client.hover.HoverControl.HoverControlListener
::onPause(Lorg/gwtopenmaps/openlayers/client/util/JSObject;)(evt);
}
});
return new $wnd.OpenLayers.Control.Hover();
}-*/;
}
------------------------------------------------------------------------------------
On Wed, Nov 3, 2010 at 6:08 AM, Edwin Commandeur <com...@gm...
> wrote:
> Hi Andrew,
>
> The example you send works nicely, so I wonder what you are confused
> about in native JavaScript. Seems a perfectly fine example of a custom
> Handler.
>
> A way to incorporate this handler in GWT-OL is by adding the code for
> the Hover control in a javascript file and distribute that with GWT-OL
> and wrap the native javascript like we wrap other Controls.
>
> There are already some javascript utility functions which are in:
>
> gwt-openlayers-client/src/main/java/org/gwtopenmaps/openlayers/public/js/gwt-openlayers/utils.js
>
> Maybe we could put a ol-extensions.js file in there, and also make
> clear in the GWT wrapper class namespace that it uses stuff in this
> extensions file.
>
> Another way would be to distribute the handler code with
> GWT-OpenLayers and explain in the wrapper Javadoc that the js file
> needs to be loaded in the page to use that specific wrapper class.
>
> A combination of Javascript and GWT wrapper seems the way to go, since
> I don't see a way to provide a Control in native GWT (you would always
> need JSNI to add functions to the Control as fas as I can see).
>
> Greetings,
> Edwin
>
> On 2 November 2010 13:45, Andrew Hughes <ahh...@gm...> wrote:
> > Hi Everyone,
> > We have a requirement that we need to register a hover handler on a map.
> > GWT-OpenLayers can't do this yet and the native javascript has me a
> little
> > confused... I have a simple javascript example working below. This seems
> > like it would be complex to wrap, advice would be most appreciated.
> >
> >
> > <html xmlns="http://www.w3.org/1999/xhtml">
> > <head>
> > <link rel="stylesheet"
> > href="http://openlayers.org/dev/theme/default/style.css" type="text/css"
> />
> > <link rel="stylesheet"
> > href="http://openlayers.org/dev/examples/style.css" type="text/css" />
> >
> > <style type="text/css">
> > #map {
> > width: 640px;
> > height: 480px;
> > }
> > </style>
> > <script
> > src="http://openlayers.org/dev/lib/Firebug/firebug.js"></script>
> > <script src="http://openlayers.org/dev/OpenLayers.js"></script>
> > <script type="text/javascript">
> >
> > OpenLayers.Control.Hover =
> OpenLayers.Class(OpenLayers.Control,
> > {
> > defaultHandlerOptions: {
> > 'delay': 500,
> > 'pixelTolerance': null,
> > 'stopMove': false
> > },
> >
> > initialize: function(options) {
> > this.handlerOptions = OpenLayers.Util.extend(
> > {}, this.defaultHandlerOptions
> > );
> > OpenLayers.Control.prototype.initialize.apply(
> > this, arguments
> > );
> > this.handler = new OpenLayers.Handler.Hover(
> > this,
> > {'pause': this.onPause, 'move': this.onMove},
> > this.handlerOptions
> > );
> > },
> >
> > onPause: function(evt) {
> > var output = document.getElementById('output');
> > var msg = 'pause ' + evt.xy;
> > output.value = output.value + msg + "\r\n";
> > },
> >
> > onMove: function(evt) {
> > // do something... like cancel
> > }
> > });
> >
> > var map;
> >
> > function init(){
> > map = new OpenLayers.Map('map');
> > var layer = new OpenLayers.Layer.WMS('OpenLayers
> > WMS','http://vmap0.tiles.osgeo.org/wms/vmap0',{layers: 'basic'});
> > map.addLayers([layer]);
> > var hoverControl = new OpenLayers.Control.Hover({
> > handlerOptions: {
> > 'delay': 500
> > }
> > });
> > map.addControl(hoverControl);
> > map.zoomToMaxExtent();
> > hoverControl.activate();
> > }
> >
> > </script>
> > </head>
> > <body onload="init()">
> > <div id="map" class="smallmap"></div>
> > <textarea class="output" id="output"></textarea></td>
> > </body>
> > </html>
> >
> >
> >
> ------------------------------------------------------------------------------
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> > _______________________________________________
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