[76] | 1 | /* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for |
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| 2 | * full list of contributors). Published under the Clear BSD license. |
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| 3 | * See http://svn.openlayers.org/trunk/openlayers/license.txt for the |
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| 4 | * full text of the license. */ |
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| 5 | |
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| 6 | |
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| 7 | /** |
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| 8 | * @requires OpenLayers/Layer.js |
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| 9 | */ |
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| 10 | |
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| 11 | /** |
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| 12 | * Class: OpenLayers.Layer.Markers |
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| 13 | * |
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| 14 | * Inherits from: |
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| 15 | * - <OpenLayers.Layer> |
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| 16 | */ |
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| 17 | OpenLayers.Layer.Markers = OpenLayers.Class(OpenLayers.Layer, { |
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| 18 | |
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| 19 | /** |
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| 20 | * APIProperty: isBaseLayer |
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| 21 | * {Boolean} Markers layer is never a base layer. |
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| 22 | */ |
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| 23 | isBaseLayer: false, |
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| 24 | |
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| 25 | /** |
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| 26 | * APIProperty: markers |
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| 27 | * {Array(<OpenLayers.Marker>)} internal marker list |
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| 28 | */ |
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| 29 | markers: null, |
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| 30 | |
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| 31 | |
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| 32 | /** |
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| 33 | * Property: drawn |
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| 34 | * {Boolean} internal state of drawing. This is a workaround for the fact |
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| 35 | * that the map does not call moveTo with a zoomChanged when the map is |
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| 36 | * first starting up. This lets us catch the case where we have *never* |
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| 37 | * drawn the layer, and draw it even if the zoom hasn't changed. |
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| 38 | */ |
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| 39 | drawn: false, |
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| 40 | |
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| 41 | /** |
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| 42 | * Constructor: OpenLayers.Layer.Markers |
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| 43 | * Create a Markers layer. |
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| 44 | * |
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| 45 | * Parameters: |
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| 46 | * name - {String} |
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| 47 | * options - {Object} Hashtable of extra options to tag onto the layer |
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| 48 | */ |
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| 49 | initialize: function(name, options) { |
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| 50 | OpenLayers.Layer.prototype.initialize.apply(this, arguments); |
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| 51 | this.markers = []; |
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| 52 | }, |
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| 53 | |
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| 54 | /** |
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| 55 | * APIMethod: destroy |
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| 56 | */ |
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| 57 | destroy: function() { |
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| 58 | this.clearMarkers(); |
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| 59 | this.markers = null; |
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| 60 | OpenLayers.Layer.prototype.destroy.apply(this, arguments); |
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| 61 | }, |
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| 62 | |
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| 63 | /** |
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| 64 | * APIMethod: setOpacity |
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| 65 | * Sets the opacity for all the markers. |
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| 66 | * |
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| 67 | * Parameter: |
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| 68 | * opacity - {Float} |
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| 69 | */ |
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| 70 | setOpacity: function(opacity) { |
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| 71 | if (opacity != this.opacity) { |
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| 72 | this.opacity = opacity; |
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| 73 | for (var i=0, len=this.markers.length; i<len; i++) { |
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| 74 | this.markers[i].setOpacity(this.opacity); |
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| 75 | } |
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| 76 | } |
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| 77 | }, |
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| 78 | |
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| 79 | /** |
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| 80 | * Method: moveTo |
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| 81 | * |
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| 82 | * Parameters: |
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| 83 | * bounds - {<OpenLayers.Bounds>} |
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| 84 | * zoomChanged - {Boolean} |
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| 85 | * dragging - {Boolean} |
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| 86 | */ |
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| 87 | moveTo:function(bounds, zoomChanged, dragging) { |
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| 88 | OpenLayers.Layer.prototype.moveTo.apply(this, arguments); |
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| 89 | |
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| 90 | if (zoomChanged || !this.drawn) { |
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| 91 | for(var i=0, len=this.markers.length; i<len; i++) { |
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| 92 | this.drawMarker(this.markers[i]); |
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| 93 | } |
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| 94 | this.drawn = true; |
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| 95 | } |
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| 96 | }, |
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| 97 | |
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| 98 | /** |
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| 99 | * APIMethod: addMarker |
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| 100 | * |
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| 101 | * Parameters: |
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| 102 | * marker - {<OpenLayers.Marker>} |
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| 103 | */ |
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| 104 | addMarker: function(marker) { |
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| 105 | this.markers.push(marker); |
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| 106 | |
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| 107 | if (this.opacity != null) { |
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| 108 | marker.setOpacity(this.opacity); |
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| 109 | } |
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| 110 | |
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| 111 | if (this.map && this.map.getExtent()) { |
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| 112 | marker.map = this.map; |
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| 113 | this.drawMarker(marker); |
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| 114 | } |
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| 115 | }, |
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| 116 | |
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| 117 | /** |
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| 118 | * APIMethod: removeMarker |
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| 119 | * |
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| 120 | * Parameters: |
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| 121 | * marker - {<OpenLayers.Marker>} |
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| 122 | */ |
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| 123 | removeMarker: function(marker) { |
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| 124 | if (this.markers && this.markers.length) { |
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| 125 | OpenLayers.Util.removeItem(this.markers, marker); |
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| 126 | marker.erase(); |
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| 127 | } |
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| 128 | }, |
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| 129 | |
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| 130 | /** |
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| 131 | * Method: clearMarkers |
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| 132 | * This method removes all markers from a layer. The markers are not |
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| 133 | * destroyed by this function, but are removed from the list of markers. |
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| 134 | */ |
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| 135 | clearMarkers: function() { |
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| 136 | if (this.markers != null) { |
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| 137 | while(this.markers.length > 0) { |
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| 138 | this.removeMarker(this.markers[0]); |
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| 139 | } |
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| 140 | } |
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| 141 | }, |
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| 142 | |
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| 143 | /** |
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| 144 | * Method: drawMarker |
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| 145 | * Calculate the pixel location for the marker, create it, and |
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| 146 | * add it to the layer's div |
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| 147 | * |
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| 148 | * Parameters: |
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| 149 | * marker - {<OpenLayers.Marker>} |
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| 150 | */ |
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| 151 | drawMarker: function(marker) { |
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| 152 | var px = this.map.getLayerPxFromLonLat(marker.lonlat); |
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| 153 | if (px == null) { |
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| 154 | marker.display(false); |
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| 155 | } else { |
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| 156 | if (!marker.isDrawn()) { |
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| 157 | var markerImg = marker.draw(px); |
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| 158 | this.div.appendChild(markerImg); |
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| 159 | } else if(marker.icon) { |
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| 160 | marker.icon.moveTo(px); |
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| 161 | } |
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| 162 | } |
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| 163 | }, |
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| 164 | |
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| 165 | /** |
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| 166 | * APIMethod: getDataExtent |
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| 167 | * Calculates the max extent which includes all of the markers. |
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| 168 | * |
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| 169 | * Returns: |
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| 170 | * {<OpenLayers.Bounds>} |
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| 171 | */ |
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| 172 | getDataExtent: function () { |
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| 173 | var maxExtent = null; |
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| 174 | |
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| 175 | if ( this.markers && (this.markers.length > 0)) { |
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| 176 | var maxExtent = new OpenLayers.Bounds(); |
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| 177 | for(var i=0, len=this.markers.length; i<len; i++) { |
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| 178 | var marker = this.markers[i]; |
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| 179 | maxExtent.extend(marker.lonlat); |
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| 180 | } |
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| 181 | } |
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| 182 | |
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| 183 | return maxExtent; |
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| 184 | }, |
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| 185 | |
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| 186 | CLASS_NAME: "OpenLayers.Layer.Markers" |
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| 187 | }); |
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