[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/Control.js |
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| 9 | */ |
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| 10 | |
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| 11 | /** |
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| 12 | * Class: OpenLayers.Control.ArgParser |
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| 13 | * The ArgParser control adds location bar querystring parsing functionality |
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| 14 | * to an OpenLayers Map. |
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| 15 | * When added to a Map control, on a page load/refresh, the Map will |
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| 16 | * automatically take the href string and parse it for lon, lat, zoom, and |
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| 17 | * layers information. |
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| 18 | * |
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| 19 | * Inherits from: |
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| 20 | * - <OpenLayers.Control> |
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| 21 | */ |
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| 22 | OpenLayers.Control.ArgParser = OpenLayers.Class(OpenLayers.Control, { |
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| 23 | |
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| 24 | /** |
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| 25 | * Parameter: center |
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| 26 | * {<OpenLayers.LonLat>} |
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| 27 | */ |
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| 28 | center: null, |
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| 29 | |
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| 30 | /** |
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| 31 | * Parameter: zoom |
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| 32 | * {int} |
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| 33 | */ |
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| 34 | zoom: null, |
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| 35 | |
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| 36 | /** |
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| 37 | * Parameter: layers |
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| 38 | * {Array(<OpenLayers.Layer>)} |
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| 39 | */ |
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| 40 | layers: null, |
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| 41 | |
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| 42 | /** |
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| 43 | * APIProperty: displayProjection |
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| 44 | * {<OpenLayers.Projection>} Requires proj4js support. |
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| 45 | * Projection used when reading the coordinates from the URL. This will |
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| 46 | * |
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| 47 | * reproject the map coordinates from the URL into the map's |
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| 48 | * projection. |
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| 49 | * |
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| 50 | * If you are using this functionality, be aware that any permalink |
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| 51 | * which is added to the map will determine the coordinate type which |
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| 52 | * is read from the URL, which means you should not add permalinks with |
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| 53 | * different displayProjections to the same map. |
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| 54 | */ |
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| 55 | displayProjection: null, |
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| 56 | |
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| 57 | /** |
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| 58 | * Constructor: OpenLayers.Control.ArgParser |
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| 59 | * |
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| 60 | * Parameters: |
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| 61 | * options - {Object} |
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| 62 | */ |
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| 63 | initialize: function(options) { |
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| 64 | OpenLayers.Control.prototype.initialize.apply(this, arguments); |
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| 65 | }, |
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| 66 | |
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| 67 | /** |
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| 68 | * Method: setMap |
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| 69 | * Set the map property for the control. |
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| 70 | * |
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| 71 | * Parameters: |
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| 72 | * map - {<OpenLayers.Map>} |
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| 73 | */ |
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| 74 | setMap: function(map) { |
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| 75 | OpenLayers.Control.prototype.setMap.apply(this, arguments); |
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| 76 | |
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| 77 | //make sure we dont already have an arg parser attached |
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| 78 | for(var i=0, len=this.map.controls.length; i<len; i++) { |
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| 79 | var control = this.map.controls[i]; |
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| 80 | if ( (control != this) && |
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| 81 | (control.CLASS_NAME == "OpenLayers.Control.ArgParser") ) { |
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| 82 | |
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| 83 | // If a second argparser is added to the map, then we |
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| 84 | // override the displayProjection to be the one added to the |
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| 85 | // map. |
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| 86 | if (control.displayProjection != this.displayProjection) { |
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| 87 | this.displayProjection = control.displayProjection; |
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| 88 | } |
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| 89 | |
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| 90 | break; |
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| 91 | } |
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| 92 | } |
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| 93 | if (i == this.map.controls.length) { |
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| 94 | |
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| 95 | var args = OpenLayers.Util.getParameters(); |
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| 96 | // Be careful to set layer first, to not trigger unnecessary layer loads |
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| 97 | if (args.layers) { |
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| 98 | this.layers = args.layers; |
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| 99 | |
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| 100 | // when we add a new layer, set its visibility |
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| 101 | this.map.events.register('addlayer', this, |
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| 102 | this.configureLayers); |
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| 103 | this.configureLayers(); |
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| 104 | } |
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| 105 | if (args.lat && args.lon) { |
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| 106 | this.center = new OpenLayers.LonLat(parseFloat(args.lon), |
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| 107 | parseFloat(args.lat)); |
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| 108 | if (args.zoom) { |
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| 109 | this.zoom = parseInt(args.zoom); |
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| 110 | } |
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| 111 | |
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| 112 | // when we add a new baselayer to see when we can set the center |
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| 113 | this.map.events.register('changebaselayer', this, |
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| 114 | this.setCenter); |
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| 115 | this.setCenter(); |
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| 116 | } |
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| 117 | } |
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| 118 | }, |
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| 119 | |
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| 120 | /** |
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| 121 | * Method: setCenter |
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| 122 | * As soon as a baseLayer has been loaded, we center and zoom |
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| 123 | * ...and remove the handler. |
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| 124 | */ |
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| 125 | setCenter: function() { |
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| 126 | |
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| 127 | if (this.map.baseLayer) { |
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| 128 | //dont need to listen for this one anymore |
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| 129 | this.map.events.unregister('changebaselayer', this, |
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| 130 | this.setCenter); |
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| 131 | |
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| 132 | if (this.displayProjection) { |
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| 133 | this.center.transform(this.displayProjection, |
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| 134 | this.map.getProjectionObject()); |
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| 135 | } |
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| 136 | |
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| 137 | this.map.setCenter(this.center, this.zoom); |
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| 138 | } |
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| 139 | }, |
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| 140 | |
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| 141 | /** |
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| 142 | * Method: configureLayers |
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| 143 | * As soon as all the layers are loaded, cycle through them and |
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| 144 | * hide or show them. |
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| 145 | */ |
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| 146 | configureLayers: function() { |
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| 147 | |
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| 148 | if (this.layers.length == this.map.layers.length) { |
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| 149 | this.map.events.unregister('addlayer', this, this.configureLayers); |
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| 150 | |
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| 151 | for(var i=0, len=this.layers.length; i<len; i++) { |
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| 152 | |
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| 153 | var layer = this.map.layers[i]; |
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| 154 | var c = this.layers.charAt(i); |
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| 155 | |
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| 156 | if (c == "B") { |
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| 157 | this.map.setBaseLayer(layer); |
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| 158 | } else if ( (c == "T") || (c == "F") ) { |
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| 159 | layer.setVisibility(c == "T"); |
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| 160 | } |
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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 | CLASS_NAME: "OpenLayers.Control.ArgParser" |
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| 166 | }); |
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