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/* Copyright (c) 2006-2013 by OpenLayers Contributors (see authors.txt for
* full list of contributors). Published under the 2-clause BSD license.
* See license.txt in the OpenLayers distribution or repository for the
* full text of the license. */
/**
* @requires OpenLayers/Layer.js
*/
/**
* Class: OpenLayers.Layer.Markers
*
* Inherits from:
* - <OpenLayers.Layer>
*/
OpenLayers.Layer.Markers = OpenLayers.Class(OpenLayers.Layer, {
/**
* APIProperty: isBaseLayer
* {Boolean} Markers layer is never a base layer.
*/
isBaseLayer: false,
/**
* APIProperty: markers
* {Array(<OpenLayers.Marker>)} internal marker list
*/
markers: null,
/**
* Property: drawn
* {Boolean} internal state of drawing. This is a workaround for the fact
* that the map does not call moveTo with a zoomChanged when the map is
* first starting up. This lets us catch the case where we have *never*
* drawn the layer, and draw it even if the zoom hasn't changed.
*/
drawn: false,
/**
* Constructor: OpenLayers.Layer.Markers
* Create a Markers layer.
*
* Parameters:
* name - {String}
* options - {Object} Hashtable of extra options to tag onto the layer
*/
initialize: function(name, options) {
OpenLayers.Layer.prototype.initialize.apply(this, arguments);
this.markers = [];
},
/**
* APIMethod: destroy
*/
destroy: function() {
this.clearMarkers();
this.markers = null;
OpenLayers.Layer.prototype.destroy.apply(this, arguments);
},
/**
* APIMethod: setOpacity
* Sets the opacity for all the markers.
*
* Parameters:
* opacity - {Float}
*/
setOpacity: function(opacity) {
if (opacity != this.opacity) {
this.opacity = opacity;
for (var i=0, len=this.markers.length; i<len; i++) {
this.markers[i].setOpacity(this.opacity);
}
}
},
/**
* Method: moveTo
*
* Parameters:
* bounds - {<OpenLayers.Bounds>}
* zoomChanged - {Boolean}
* dragging - {Boolean}
*/
moveTo:function(bounds, zoomChanged, dragging) {
OpenLayers.Layer.prototype.moveTo.apply(this, arguments);
if (zoomChanged || !this.drawn) {
for(var i=0, len=this.markers.length; i<len; i++) {
this.drawMarker(this.markers[i]);
}
this.drawn = true;
}
},
/**
* APIMethod: addMarker
*
* Parameters:
* marker - {<OpenLayers.Marker>}
*/
addMarker: function(marker) {
this.markers.push(marker);
if (this.opacity < 1) {
marker.setOpacity(this.opacity);
}
if (this.map && this.map.getExtent()) {
marker.map = this.map;
this.drawMarker(marker);
}
},
/**
* APIMethod: removeMarker
*
* Parameters:
* marker - {<OpenLayers.Marker>}
*/
removeMarker: function(marker) {
if (this.markers && this.markers.length) {
OpenLayers.Util.removeItem(this.markers, marker);
marker.erase();
}
},
/**
* Method: clearMarkers
* This method removes all markers from a layer. The markers are not
* destroyed by this function, but are removed from the list of markers.
*/
clearMarkers: function() {
if (this.markers != null) {
while(this.markers.length > 0) {
this.removeMarker(this.markers[0]);
}
}
},
/**
* Method: drawMarker
* Calculate the pixel location for the marker, create it, and
* add it to the layer's div
*
* Parameters:
* marker - {<OpenLayers.Marker>}
*/
drawMarker: function(marker) {
var px = this.map.getLayerPxFromLonLat(marker.lonlat);
if (px == null) {
marker.display(false);
} else {
if (!marker.isDrawn()) {
var markerImg = marker.draw(px);
this.div.appendChild(markerImg);
} else if(marker.icon) {
marker.icon.moveTo(px);
}
}
},
/**
* APIMethod: getDataExtent
* Calculates the max extent which includes all of the markers.
*
* Returns:
* {<OpenLayers.Bounds>}
*/
getDataExtent: function () {
var maxExtent = null;
if ( this.markers && (this.markers.length > 0)) {
var maxExtent = new OpenLayers.Bounds();
for(var i=0, len=this.markers.length; i<len; i++) {
var marker = this.markers[i];
maxExtent.extend(marker.lonlat);
}
}
return maxExtent;
},
CLASS_NAME: "OpenLayers.Layer.Markers"
});