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: "media/marker-normal.png",
  22         MARKER_SELECT_ICON: "media/marker-selected.png",
  23         MARKER_HEIGHT: 25
  24     },
  25
  26     map: null,
  27     baseLayer: null,
  28     dataLayer: null,
  29     selectControl: null,
  30
  31     init: function() {
  32         this.map = new OpenLayers.Map("map", {
  33             controls:[
  34                 new OpenLayers.Control.SypAttribution(),
  35                 new OpenLayers.Control.Navigation(),
  36                 new OpenLayers.Control.PanZoom(),
  37                 new OpenLayers.Control.Permalink()
  38             ],
  39             projection: new OpenLayers.Projection("EPSG:900913"),
  40             displayProjection: new OpenLayers.Projection("EPSG:4326")
  41         } );
  42
  43         this.baseLayer = this.createBaseLayer();
  44         this.dataLayer = this.createDataLayer();
  45         this.map.addLayers([this.baseLayer, this.dataLayer]);
  46
  47         this.selectControl = this.createSelectControl();
  48         this.map.addControl(this.selectControl);
  49         this.selectControl.activate();
  50
  51         if (!this.map.getCenter()) {
  52             var centerBounds = new OpenLayers.Bounds();
  53
  54             var mapProj = this.map.getProjectionObject();
  55             var sypOrigProj = new OpenLayers.Projection("EPSG:4326");
  56
  57             var bottomLeft = new OpenLayers.LonLat(sypOrig[0],sypOrig[1]);
  58             bottomLeft = bottomLeft.transform(sypOrigProj, mapProj);
  59             var topRight = new OpenLayers.LonLat(sypOrig[2],sypOrig[3])
  60             topRight = topRight.transform(sypOrigProj, mapProj);
  61
  62             centerBounds.extend(bottomLeft);
  63             centerBounds.extend(topRight);
  64             this.map.zoomToExtent(centerBounds);
  65         }
  66     },
  67
  68     createBaseLayer: function() {
  69         return new OpenLayers.Layer.OSM("OSM");
  70     },
  71
  72     createDataLayer: function(map) {
  73         var defaultStyle = new OpenLayers.Style({
  74             externalGraphic: this.Settings.MARKER_ICON,
  75             graphicHeight: "${height}"
  76         }, {
  77             context: {
  78                 height: function(feature) {
  79                     var defaultHeight = SYP.Settings.MARKER_HEIGHT || 32;
  80                     var increase = 4 * (feature.attributes.count - 1);
  81                     return Math.min(defaultHeight + increase, 50);
  82                 }
  83             }
  84         });
  85         var selectStyle = new OpenLayers.Style({
  86             externalGraphic: this.Settings.MARKER_SELECT_ICON,
  87             graphicHeight: this.Settings.MARKER_HEIGHT || 32
  88         });
  89         var styleMap = new OpenLayers.StyleMap (
  90                         {"default": defaultStyle,
  91                          "select": selectStyle});
  92
  93         var layer = new OpenLayers.Layer.GML("KML", "items.php",
  94            {
  95                strategies: [
  96                 new OpenLayers.Strategy.Cluster()
  97                 ],
  98             styleMap: styleMap,
  99             format: OpenLayers.Format.KML,
 100             projection: this.map.displayProjection,
 101             eventListeners: { scope: this,
 102                               loadend: this.checkForFeatures
 103                             }
 104            });
 105
 106         return layer;
 107     },
 108
 109     createSelectControl: function() {
 110         var control = new OpenLayers.Control.SelectFeature(
 111                                             this.dataLayer, {
 112                                                onSelect: this.onFeatureSelect,
 113                                                onUnselect: this.onFeatureUnselect,
 114                                                toggle: true,
 115                                                clickout: false
 116                                                             });
 117         return control;
 118     },
 119
 120     checkForFeatures: function() {
 121         var features = this.dataLayer.features;
 122         if (features.length == 0) {
 123             var message = SypStrings.noImageRegistered;
 124             this.Utils.displayUserMessage(message, "warn");
 125         }
 126     },
 127
 128     createPopup: function(position, contentHTML) {
 129         var popup = new OpenLayers.Popup.Anchored("popup",
 130                                                   position,
 131                                                   null,
 132                                                   contentHTML,
 133                                                   null,
 134                                                   true);
 135         popup.autoSize = true;
 136         popup.backgroundColor = ""; // deal with it in css
 137         popup.border = ""; // deal with it in css
 138         popup.closeOnMove = true;
 139         return popup;
 140     },
 141
 142     onFeatureUnselect: function (feature) {
 143         var map = feature.layer.map;
 144         var permaControl = map.getControlsByClass("OpenLayers.Control.Permalink");
 145         if (permaControl[0]) {
 146             permaControl[0].div.style.display = "";
 147         }
 148         if (!feature.popup) {
 149             this.map.events.unregister("movestart", this, this._unselect);
 150             return;
 151         }
 152         var popup = feature.popup;
 153         if (popup.visible()) {
 154             popup.hide();
 155         }
 156     },
 157
 158     onFeatureSelect: function(feature) {
 159         var map = feature.layer.map;
 160         if (feature.attributes.count > 1) {
 161             this.unselect(feature);
 162             var lonlat = new OpenLayers.LonLat(feature.geometry.x, feature.geometry.y);
 163             map.setCenter(lonlat, map.zoom + 1);
 164             return;
 165         }
 166         var permaControl = map.getControlsByClass("OpenLayers.Control.Permalink");
 167         if (permaControl[0]) {
 168             permaControl[0].div.style.display = "none";
 169         }
 170         var popup = feature.popup;
 171
 172         var popupPos = null;
 173         if (sypPopupNearFeature) {
 174             popupPos = feature.geometry.getBounds().getCenterLonLat();
 175         } else {
 176             popupPos = SYP.Utils.brCorner(map, 8);
 177         }
 178
 179         // we cannot reuse popup; we need to recreate it in order for IE
 180         // expressions to work. Otherwise, we get a 0x0 image on second view.
 181         if (popup) {
 182             popup.destroy();
 183         }
 184         var contentHTML;
 185         if (feature.cluster[0].attributes.name) {
 186             contentHTML = "<h2>" +
 187                           feature.cluster[0].attributes.name +
 188                           "</h2>" +
 189                           feature.cluster[0].attributes.description;
 190         } else {
 191             contentHTML = feature.cluster[0].attributes.description;
 192         }
 193         if (!contentHTML || !contentHTML.length) {
 194             this.map.events.register("movestart", this, this._unselect = function () { this.unselect(feature)});
 195             return;
 196         }
 197         popup = SYP.createPopup(popupPos, contentHTML);
 198         var control = this;
 199         popup.hide = function () {
 200             OpenLayers.Element.hide(this.div);
 201             control.unselectAll();
 202         };
 203         map.addPopup(popup);
 204         feature.popup = popup;
 205         var anchor = popup.div.getElementsByTagName("a")[0];
 206         if (anchor) {
 207             anchor.onclick = function() {
 208                 SYP.showBigImage(this.href);
 209                 return false;
 210             }
 211         }
 212     },
 213
 214     showBigImage: function (href) {
 215         try {
 216             document.getElementById('bigimg_container').style.display = "table";
 217         } catch(e) {
 218             document.getElementById('bigimg_container').style.display = "block";
 219         }
 220         var maxHeight = document.body.clientHeight * 0.9;
 221         var maxWidth = document.body.clientWidth * 0.9;
 222         document.getElementById('bigimg').style.height = "";
 223         document.getElementById('bigimg').style.width = "";
 224         document.getElementById('bigimg').style.maxHeight = maxHeight + "px";
 225         document.getElementById('bigimg').style.maxWidth = maxWidth + "px";
 226         document.getElementById('bigimg').onload = function () {
 227             var icon = document.getElementById('bigimg_close');
 228             icon.style.top = this.offsetTop;
 229             icon.style.left = this.offsetLeft + this.clientWidth - icon.clientWidth;
 230
 231             var heightRatio = this.clientHeight / parseInt(this.style.maxHeight);
 232             var widthRatio = this.clientWidth / parseInt(this.style.maxWidth);
 233             if (heightRatio > 1 || widthRatio > 1) {
 234                 if (heightRatio > widthRatio) {
 235                     this.style.height = this.style.maxHeight;
 236                 } else {
 237                     this.style.width = this.style.maxWidth;
 238                 }
 239             }
 240
 241         };
 242         document.getElementById('bigimg').src = href;
 243     },
 244
 245     closeBigImage: function() {
 246         document.getElementById('bigimg').src = "";
 247         document.getElementById('bigimg').parentNode.innerHTML = document.getElementById('bigimg').parentNode.innerHTML;
 248         document.getElementById('bigimg_container').style.display = "none";
 249     },
 250
 251     Utils: {
 252         brCorner: function(map, margin) {
 253             var bounds = map.calculateBounds();
 254             var corner = new OpenLayers.LonLat(bounds.right, bounds.bottom);
 255             var cornerAsPx = map.getPixelFromLonLat(corner);
 256             cornerAsPx = cornerAsPx.add( -margin, -margin);
 257             corner = map.getLonLatFromPixel(cornerAsPx);
 258             return corner;
 259         },
 260         displayUserMessage: function(message, status) {
 261             var div = document.getElementById('message');
 262             while (div.firstChild)
 263                 div.removeChild(div.firstChild);
 264             var textNode = document.createTextNode(message);
 265             switch (status) {
 266                 case "error":
 267                     div.style.color = "red";
 268                     break;
 269                 case "warn":
 270                     div.style.color = "#FF8C00";
 271                     break;
 272                 case "success":
 273                     div.style.color = "green";
 274                     break;
 275                 default:
 276                     div.style.color = "black";
 277                     break;
 278             }
 279             div.style.display = "block";
 280             div.appendChild(textNode);
 281         }
 282     }
 283 };
 284
 285 // if possible, determine language with HTTP_ACCEPT_LANGUAGE instead of
 286 // navigator.language
 287 if (OpenLayers.Lang[SypStrings.language]) {
 288     OpenLayers.Lang.setCode(SypStrings.language);
 289 }
 290
 291 // avoid alerts
 292 OpenLayers.Console.userError = function(error) {
 293     SYP.Utils.displayUserMessage(error, "error");
 294 }
 295
 296 // sometimes, especially when cache is clear, firefox does not compute
 297 // correctly popup size. That's because at the end of getRenderedDimensions,
 298 // dimensions of image is not known. So, we work around that problem by setting
 299 // image width and image height. That way, dimensions of image are set in
 300 // innerHTML, and are therefore known in getRenderedDimensions
 301 OpenLayers.Popup.Anchored.prototype.registerImageListeners = function() {
 302     var onImgLoad = function() {
 303         this.img.width =  this.img.width;
 304         this.img.height =  this.img.height;
 305         this.popup.updateSize();
 306         OpenLayers.Event.stopObserving(
 307             this.img, "load", this.img._onImageLoad
 308         );
 309     };
 310
 311     var images = this.contentDiv.getElementsByTagName("img");
 312     for (var i = 0, len = images.length; i < len; i++) {
 313         var img = images[i];
 314         if (img.width == 0 || img.height == 0) {
 315
 316             var context = {
 317                 'popup': this,
 318                 'img': img
 319             };
 320
 321             img._onImgLoad = OpenLayers.Function.bind(onImgLoad, context);
 322
 323             OpenLayers.Event.observe(img, 'load', img._onImgLoad);
 324         }
 325     }
 326 }