js/syp.js

   1 /* Copyright (c) 2009 Arnaud Renevier, Inc, published under the modified BSD
   2  * license. */
   3
   4 OpenLayers.Control.SypAttribution = OpenLayers.Class (OpenLayers.Control.Attribution, {
   5     updateAttribution: function() {
   6         var attributions = [SypStrings.propulsedByLink];
   7         if (this.map && this.map.layers) {
   8             for(var i=0, len=this.map.layers.length; i<len; i++) {
   9                 var layer = this.map.layers[i];
  10                 if (layer.attribution && layer.getVisibility()) {
  11                     attributions.push( layer.attribution );
  12                 }
  13             }
  14             this.div.innerHTML = attributions.join(this.separator);
  15         }
  16     }
  17 });
  18
  19 var SYP = {
  20     Settings: {
  21         MARKER_ICON: "openlayers/img/marker-blue.png",
  22         MARKER_ICON_HEIGHT: 25,
  23         MARKER_SELECT_ICON: "openlayers/img/marker-green.png",
  24         MARKER_SELECT_ICON_HEIGHT: 25
  25     },
  26
  27     map: null,
  28     baseLayer: null,
  29     dataLayer: null,
  30     selectControl: null,
  31
  32     init: function() {
  33         this.map = new OpenLayers.Map("map", {
  34             controls:[
  35                 new OpenLayers.Control.SypAttribution(),
  36                 new OpenLayers.Control.Navigation(),
  37                 new OpenLayers.Control.PanZoom(),
  38                 new OpenLayers.Control.Permalink()
  39             ],
  40             projection: new OpenLayers.Projection("EPSG:900913"),
  41             displayProjection: new OpenLayers.Projection("EPSG:4326")
  42         } );
  43
  44         this.baseLayer = this.createBaseLayer();
  45         this.dataLayer = this.createDataLayer();
  46         this.map.addLayers([this.baseLayer, this.dataLayer]);
  47
  48         this.selectControl = this.createSelectControl();
  49         this.map.addControl(this.selectControl);
  50         this.selectControl.activate();
  51
  52         if (!this.map.getCenter()) {
  53             var centerBounds = new OpenLayers.Bounds();
  54
  55             var mapProj = this.map.getProjectionObject();
  56             var sypOrigProj = new OpenLayers.Projection("EPSG:4326");
  57
  58             var bottomLeft = new OpenLayers.LonLat(sypOrig[0],sypOrig[1]);
  59             bottomLeft = bottomLeft.transform(sypOrigProj, mapProj);
  60             var topRight = new OpenLayers.LonLat(sypOrig[2],sypOrig[3])
  61             topRight = topRight.transform(sypOrigProj, mapProj);
  62
  63             centerBounds.extend(bottomLeft);
  64             centerBounds.extend(topRight);
  65             this.map.zoomToExtent(centerBounds);
  66         }
  67     },
  68
  69     createBaseLayer: function() {
  70         return new OpenLayers.Layer.OSM("OSM");
  71     },
  72
  73     createDataLayer: function(map) {
  74         var defaultStyle = new OpenLayers.Style({
  75             externalGraphic: this.Settings.MARKER_ICON,
  76             graphicHeight: "${height}"
  77         }, {
  78             context: {
  79                 height: function(feature) {
  80                     var defaultHeight = SYP.Settings.MARKER_ICON_HEIGHT || 32;
  81                     var increase = 4 * (feature.attributes.count - 1);
  82                     return Math.min(defaultHeight + increase, 50);
  83                 }
  84             }
  85         });
  86         var selectStyle = new OpenLayers.Style({
  87             externalGraphic: this.Settings.MARKER_SELECT_ICON,
  88             graphicHeight: this.Settings.MARKER_SELECT_ICON_HEIGHT || 32
  89         });
  90         var styleMap = new OpenLayers.StyleMap (
  91                         {"default": defaultStyle,
  92                          "select": selectStyle});
  93
  94         var layer = new OpenLayers.Layer.GML("KML", "items.php",
  95            {
  96                strategies: [
  97                 new OpenLayers.Strategy.Cluster()
  98                 ],
  99             styleMap: styleMap,
 100             format: OpenLayers.Format.KML,
 101             projection: this.map.displayProjection,
 102             eventListeners: { scope: this,
 103                               loadend: this.checkForFeatures
 104                             }
 105            });
 106
 107         return layer;
 108     },
 109
 110     createSelectControl: function() {
 111         var control = new OpenLayers.Control.SelectFeature(
 112                                             this.dataLayer, {
 113                                                onSelect: this.onFeatureSelect,
 114                                                onUnselect: this.onFeatureUnselect,
 115                                                toggle: true,
 116                                                clickout: false
 117                                                             });
 118         return control;
 119     },
 120
 121     checkForFeatures: function() {
 122         var features = this.dataLayer.features;
 123         if (features.length == 0) {
 124             var message = SypStrings.noImageRegistered;
 125             this.Utils.displayUserMessage(message, "warn");
 126         }
 127     },
 128
 129     createPopup: function(position, contentHTML) {
 130         var popup = new OpenLayers.Popup.Anchored("popup",
 131                                                   position,
 132                                                   null,
 133                                                   contentHTML,
 134                                                   null,
 135                                                   true);
 136         popup.autoSize = true;
 137         popup.backgroundColor = ""; // deal with it in css
 138         popup.border = ""; // deal with it in css
 139         popup.closeOnMove = true;
 140         return popup;
 141     },
 142
 143     onFeatureUnselect: function (feature) {
 144         var map = feature.layer.map;
 145         var permaControl = map.getControlsByClass("OpenLayers.Control.Permalink");
 146         if (permaControl[0]) {
 147             permaControl[0].div.style.display = "";
 148         }
 149         if (!feature.popup) {
 150             this.map.events.unregister("movestart", this, this._unselect);
 151             return;
 152         }
 153         var popup = feature.popup;
 154         if (popup.visible()) {
 155             popup.hide();
 156         }
 157     },
 158
 159     onFeatureSelect: function(feature) {
 160         var map = feature.layer.map;
 161         if (feature.attributes.count > 1) {
 162             this.unselect(feature);
 163             var lonlat = new OpenLayers.LonLat(feature.geometry.x, feature.geometry.y);
 164             map.setCenter(lonlat, map.zoom + 1);
 165             return;
 166         }
 167         var permaControl = map.getControlsByClass("OpenLayers.Control.Permalink");
 168         if (permaControl[0]) {
 169             permaControl[0].div.style.display = "none";
 170         }
 171         var popup = feature.popup;
 172
 173         var brCorner = SYP.Utils.brCorner(map, 8);
 174
 175         // we cannot reuse popup; we need to recreate it in order for IE
 176         // expressions to work. Otherwise, we get a 0x0 image on second view.
 177         if (popup) {
 178             popup.destroy();
 179         }
 180         var contentHTML;
 181         if (feature.cluster[0].attributes.name) {
 182             contentHTML = "<h2>" +
 183                           feature.cluster[0].attributes.name +
 184                           "</h2>" +
 185                           feature.cluster[0].attributes.description;
 186         } else {
 187             contentHTML = feature.cluster[0].attributes.description;
 188         }
 189         if (!contentHTML || !contentHTML.length) {
 190             this.map.events.register("movestart", this, this._unselect = function () { this.unselect(feature)});
 191             return;
 192         }
 193         popup = SYP.createPopup(brCorner, contentHTML);
 194         var control = this;
 195         popup.hide = function () {
 196             OpenLayers.Element.hide(this.div);
 197             control.unselectAll();
 198         };
 199         map.addPopup(popup);
 200         feature.popup = popup;
 201     },
 202
 203     Utils: {
 204         brCorner: function(map, margin) {
 205             var bounds = map.calculateBounds();
 206             var corner = new OpenLayers.LonLat(bounds.right, bounds.bottom);
 207             var cornerAsPx = map.getPixelFromLonLat(corner);
 208             cornerAsPx = cornerAsPx.add( -margin, -margin);
 209             corner = map.getLonLatFromPixel(cornerAsPx);
 210             return corner;
 211         },
 212         displayUserMessage: function(message, status) {
 213             var div = document.getElementById('message');
 214             while (div.firstChild)
 215                 div.removeChild(div.firstChild);
 216             var textNode = document.createTextNode(message);
 217             switch (status) {
 218                 case "error":
 219                     div.style.color = "red";
 220                     break;
 221                 case "warn":
 222                     div.style.color = "#FF8C00";
 223                     break;
 224                 case "success":
 225                     div.style.color = "green";
 226                     break;
 227                 default:
 228                     div.style.color = "black";
 229                     break;
 230             }
 231             div.style.display = "block";
 232             div.appendChild(textNode);
 233         }
 234     }
 235 };
 236
 237 // if possible, determine language with HTTP_ACCEPT_LANGUAGE instead of
 238 // navigator.language
 239 if (OpenLayers.Lang[SypStrings.language]) {
 240     OpenLayers.Lang.setCode(SypStrings.language);
 241 }
 242
 243 // avoid alerts
 244 OpenLayers.Console.userError = function(error) {
 245     SYP.Utils.displayUserMessage(error, "error");
 246 }
 247
 248 // sometimes, especially when cache is clear, firefox does not compute
 249 // correctly popup size. That's because at the end of getRenderedDimensions,
 250 // dimensions of image is not known. So, we work around that problem by setting
 251 // image width and image height. That way, dimensions of image are set in
 252 // innerHTML, and are therefore known in getRenderedDimensions
 253 OpenLayers.Popup.Anchored.prototype.registerImageListeners = function() {
 254     var onImgLoad = function() {
 255         this.img.width =  this.img.width;
 256         this.img.height =  this.img.height;
 257         this.popup.updateSize();
 258         OpenLayers.Event.stopObserving(
 259             this.img, "load", this.img._onImageLoad
 260         );
 261     };
 262
 263     var images = this.contentDiv.getElementsByTagName("img");
 264     for (var i = 0, len = images.length; i < len; i++) {
 265         var img = images[i];
 266         if (img.width == 0 || img.height == 0) {
 267
 268             var context = {
 269                 'popup': this,
 270                 'img': img
 271             };
 272
 273             img._onImgLoad = OpenLayers.Function.bind(onImgLoad, context);
 274
 275             OpenLayers.Event.observe(img, 'load', img._onImgLoad);
 276         }
 277     }
 278 }