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/* Copyright (c) 2006-2011 by OpenLayers Contributors (see authors.txt for
* full list of contributors). Published under the Clear BSD license.
* See http://svn.openlayers.org/trunk/openlayers/license.txt for the
* full text of the license. */
/**
* @requires OpenLayers/Control.js
* @requires OpenLayers/Geometry/Point.js
* @requires OpenLayers/Projection.js
*/
/**
* Class: OpenLayers.Control.Geolocate
* The Geolocate control wraps w3c geolocation API into control that can be
* bound to a map, and generate events on location update
*
* To use this control requires to load the proj4js library if the projection
* of the map is not EPSG:4326 or EPSG:900913.
*
* Inherits from:
* - <OpenLayers.Control>
*/
OpenLayers.Control.Geolocate = OpenLayers.Class(OpenLayers.Control, {
/**
* Constant: EVENT_TYPES
* Supported event types:
* - *locationupdated* Triggered when browser return a new position
* - *locationfailed* Triggered when geolocation has failed
* - *locationuncapable* Triggered when control is activated on a browser
* which doesn't support geolocation
*/
EVENT_TYPES: ["locationupdated", "locationfailed", "locationuncapable"],
/**
* Property: geolocation
* {Object} The geolocation engine, as a property to be possibly mocked.
*/
geolocation: navigator.geolocation,
/**
* APIProperty: bind
* {Boolean} If true, map center will be set on location update.
*/
bind: true,
/**
* APIProperty: watch
* {Boolean} If true, position will be update regularly.
*/
watch: false,
/**
* APIProperty: geolocationOptions
* {Object} Options to pass to the navigator's geolocation API. See
* <http://dev.w3.org/geo/api/spec-source.html>. No specific
* option is passed to the geolocation API by default.
*/
geolocationOptions: null,
/**
* Constructor: OpenLayers.Control.Geolocate
* Create a new control to deal with browser geolocation API
*
*/
initialize: function(options) {
// concatenate events specific to this control with those from the base
this.EVENT_TYPES =
OpenLayers.Control.Geolocate.prototype.EVENT_TYPES.concat(
OpenLayers.Control.prototype.EVENT_TYPES
);
this.geolocationOptions = {};
OpenLayers.Control.prototype.initialize.apply(this, [options]);
},
/**
* Method: destroy
*/
destroy: function() {
this.deactivate();
OpenLayers.Control.prototype.destroy.apply(this, arguments);
},
/**
* Method: activate
* Activates the control.
*
* Returns:
* {Boolean} The control was effectively activated.
*/
activate: function () {
if (!this.geolocation) {
this.events.triggerEvent("locationuncapable");
return false;
}
if (OpenLayers.Control.prototype.activate.apply(this, arguments)) {
if (this.watch) {
this.watchId = this.geolocation.watchPosition(
OpenLayers.Function.bind(this.geolocate, this),
OpenLayers.Function.bind(this.failure, this),
this.geolocationOptions
);
} else {
this.getCurrentLocation();
}
return true;
}
return false;
},
/**
* Method: deactivate
* Deactivates the control.
*
* Returns:
* {Boolean} The control was effectively deactivated.
*/
deactivate: function () {
if (this.active && this.watchId !== null) {
this.geolocation.clearWatch(this.watchId);
}
return OpenLayers.Control.prototype.deactivate.apply(
this, arguments
);
},
/**
* Method: geolocate
* Activates the control.
*
*/
geolocate: function (position) {
var center = new OpenLayers.LonLat(
position.coords.longitude,
position.coords.latitude
).transform(
new OpenLayers.Projection("EPSG:4326"),
this.map.getProjectionObject()
);
if (this.bind) {
this.map.setCenter(center);
}
this.events.triggerEvent("locationupdated", {
position: position,
point: new OpenLayers.Geometry.Point(
center.lon, center.lat
)
});
},
/**
* APIMethod: getCurrentLocation
*
* Returns:
* {Boolean} Returns true if a event will be fired (successfull
* registration)
*/
getCurrentLocation: function() {
if (!this.active || this.watch) {
return false;
}
this.geolocation.getCurrentPosition(
OpenLayers.Function.bind(this.geolocate, this),
OpenLayers.Function.bind(this.failure, this),
this.geolocationOptions
);
return true;
},
/**
* Method: failure
* method called on browser's geolocation failure
*
*/
failure: function (error) {
this.events.triggerEvent("locationfailed", {error: error});
},
CLASS_NAME: "OpenLayers.Control.Geolocate"
});
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