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Re: [Gwt-openlayers-users] Handler Hover (Control), how?
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From: Edwin C. <com...@gm...> - 2010-11-04 19:49:50
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Hi Andrew,
Every place where you refer to an object that has been placed on the
window you need $wnd , so that is everywhere where you reference
OpenLayers.something it should be $wnd.OpenLayers.something.
Greetings,
Edwin
On 4 November 2010 00:22, Andrew Hughes <ahh...@gm...> wrote:
> 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) {
>
> cal...@co....HoverControlListener::onPause(Lorg/gwtopenmaps/openlayers/client/util/JSObject;)(evt);
> },
>
> onMove: function(evt) {
>
> cal...@co....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>
>> >
>> >
>> >
>> > ------------------------------------------------------------------------------
>> > Nokia and AT&T present the 2010 Calling All Innovators-North America
>> > contest
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>> > marketing
>> > Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store
>> > http://p.sf.net/sfu/nokia-dev2dev
>> > _______________________________________________
>> > Gwt-openlayers-users mailing list
>> > Gwt...@li...
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>> >
>> >
>
>
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