1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 | /* Copyright (c) 2006-2010 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/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. * * Parameter: * 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 != null) { 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" }); |