Merge pull request #214 from Xelio/patch-layer-control-status

Add function to store layer control status (overlay only) in cookie for using in next session.

code/boot.js

@@ -83,6 +83,26 @@ window.setupLayerChooserSelectOne = function() {
   });
 }
 
+// Setup the function to record the on/off status of overlay layerGroups
+window.setupLayerChooserStatusRecorder = function() {
+  // Record already added layerGroups
+  $.each(window.layerChooser._layers, function(ind, chooserEntry) {
+    if(!chooserEntry.overlay) return true;
+    var display = window.map.hasLayer(chooserEntry.layer);
+    window.updateDisplayedLayerGroup(chooserEntry.name, display);
+  });
+
+  // Record layerGroups change
+  window.map.on('layeradd layerremove', function(e) {
+    var id = L.stamp(e.layer);
+    var layerGroup = this._layers[id];
+    if (layerGroup && layerGroup.overlay) {
+      var display = (e.type === 'layeradd');
+      window.updateDisplayedLayerGroup(layerGroup.name, display);
+    }
+  }, window.layerChooser);
+}
+
 window.setupStyles = function() {
   $('head').append('<style>' +
     [ '#largepreview.enl img { border:2px solid '+COLORS[TEAM_ENL]+'; } ',
@@ -370,6 +390,7 @@ function boot() {
   window.chat.setup();
   window.setupQRLoadLib();
   window.setupLayerChooserSelectOne();
+  window.setupLayerChooserStatusRecorder();
   window.setupBackButton();
   // read here ONCE, so the URL is only evaluated one time after the
   // necessary data has been loaded.

code/utils_misc.js

@@ -347,3 +347,25 @@ window.convertTextToTableMagic = function(text) {
 window.calcTriArea = function(p) {
   return Math.abs((p[0].lat*(p[1].lng-p[2].lng)+p[1].lat*(p[2].lng-p[0].lng)+p[2].lat*(p[0].lng-p[1].lng))/2);
 }
+
+// Update layerGroups display status to window.overlayStatus and cookie 'ingress.intelmap.layergroupdisplayed'
+window.updateDisplayedLayerGroup = function(name, display) {
+  overlayStatus[name] = display;
+  writeCookie('ingress.intelmap.layergroupdisplayed', JSON.stringify(overlayStatus));
+}
+
+// Read layerGroup status from window.overlayStatus if it was added to map,
+// read from cookie if it has not added to map yet.
+// return true if both overlayStatus and cookie didn't have the record
+window.isLayerGroupDisplayed = function(name) {
+  if(typeof(overlayStatus[name]) !== 'undefined') return overlayStatus[name];
+
+  var layersJSON = readCookie('ingress.intelmap.layergroupdisplayed');
+  if(!layersJSON) return true;
+
+  var layers = JSON.parse(layersJSON);
+  // keep latest overlayStatus
+  overlayStatus = $.extend(layers, overlayStatus);
+  if(typeof(overlayStatus[name]) === 'undefined') return true;
+  return overlayStatus[name];
+}

main.js

@@ -232,6 +232,10 @@ window.links = {};
 window.fields = {};
 window.resonators = {};
 
+// contain current status(on/off) of overlay layerGroups.
+// But you should use isLayerGroupDisplayed(name) to check the status
+window.overlayStatus = {};
+
 // plugin framework. Plugins may load earlier than iitc, so don’t
 // overwrite data
 if(typeof window.plugin !== 'function') window.plugin = function() {};