Fix flicker portal in portal render limit handler

Change:
Extract portal handle process from "handleDataResponse" to "handlePortalData"
Add "action" property to object returned by $.ajax() to identity type of request
Delay low level portal render until no active request of map data.

code/map_data.js

@@ -49,7 +49,7 @@ window.requestData = function() {
   $.each(tiles, function(ind, tls) {
     data = { minLevelOfDetail: -1 };
     data.boundsParamsList = tls;
-    window.requests.add(window.postAjax('getThinnedEntitiesV2', data, window.handleDataResponse));
+    window.requests.add(window.postAjax('getThinnedEntitiesV2', data, window.handleDataResponse, portalRenderLimit.handleFailRequest));
   });
 }
 
@@ -59,11 +59,10 @@ window.handleDataResponse = function(data, textStatus, jqXHR) {
   if(!data || !data.result) {
     window.failedRequestCount++;
     console.warn(data);
+    portalRenderLimit.handleFailRequest();
     return;
   }
 
-  var portalUpdateAvailable = false;
-  var portalInUrlAvailable = false;
   var m = data.result.map;
   // defer rendering of portals because there is no z-index in SVG.
   // this means that what’s rendered last ends up on top. While the
@@ -72,8 +71,6 @@ window.handleDataResponse = function(data, textStatus, jqXHR) {
   // https://github.com/Leaflet/Leaflet/issues/185
   var ppp = [];
   var p2f = {};
-  // Reset new portals count of Portal Render Limit handler
-  portalRenderLimit.resetCounting();
   $.each(m, function(qk, val) {
     $.each(val.deletedGameEntityGuids, function(ind, guid) {
       if(getTypeByGuid(guid) === TYPE_FIELD && window.fields[guid] !== undefined) {
@@ -92,8 +89,6 @@ window.handleDataResponse = function(data, textStatus, jqXHR) {
       // format for portals: { controllingTeam, turret }
 
       if(ent[2].turret !== undefined) {
-        if(selectedPortal === ent[0]) portalUpdateAvailable = true;
-        if(urlPortal && ent[0] == urlPortal) portalInUrlAvailable = true;
 
         var latlng = [ent[2].locationE6.latE6/1E6, ent[2].locationE6.lngE6/1E6];
         if(!window.getPaddedBounds().contains(latlng)
@@ -102,7 +97,7 @@ window.handleDataResponse = function(data, textStatus, jqXHR) {
           ) return;
 
 
-        portalRenderLimit.pushPortal(ent);
+
         ppp.push(ent); // delay portal render
       } else if(ent[2].edge !== undefined) {
         renderLink(ent);
@@ -129,11 +124,27 @@ window.handleDataResponse = function(data, textStatus, jqXHR) {
     }
   });
   
+  // Process the portals with portal render limit handler first
+  ppp = portalRenderLimit.processPortals(ppp);
+  handlePortalData(ppp);
+
+  resolvePlayerNames();
+  renderUpdateStatus();
+}
+
+window.handlePortalData = function(ppp) {
+  var portalUpdateAvailable = false;
+  var portalInUrlAvailable = false;
+
   // Preserve and restore "selectedPortal" between portal re-render
   if(portalUpdateAvailable) var oldSelectedPortal = selectedPortal;
 
   runHooks('portalDataLoaded', {portals : ppp});
-  $.each(ppp, function(ind, portal) { renderPortal(portal); });
+  $.each(ppp, function(ind, portal) {
+    if(selectedPortal === portal[0]) portalUpdateAvailable = true;
+    if(urlPortal && portal[0] == urlPortal) portalInUrlAvailable = true;
+    renderPortal(portal);
+  });
 
   var selectedPortalLayer = portals[oldSelectedPortal];
   if(portalUpdateAvailable && selectedPortalLayer) selectedPortal = oldSelectedPortal;
@@ -150,8 +161,6 @@ window.handleDataResponse = function(data, textStatus, jqXHR) {
   }
 
   if(portalUpdateAvailable) renderPortalDetails(selectedPortal);
-  resolvePlayerNames();
-  renderUpdateStatus();
 }
 
 // removes entities that are still handled by Leaflet, although they

code/portal_render_limit.js

@@ -3,9 +3,22 @@
 // Functions to handle hiding low level portal when portal render 
 // limit is reached. 
 //
-// After initialized and reset in window.requestData(), portals in 
-// response data will pass to function "pushPortal". Each new portal 
-// not on the map will add 1 to newPortalsPerLevel[portal level].
+// On initialization, previous minLevel will preserve to previousMinLevel
+// with zoom level difference. 
+//
+// After initialized and reset in window.requestData(), "processPortals" 
+// intercept all portals data in "handleDataResponse". Put the count of 
+// new portals to newPortalsPerLevel[portal level]. And split portals 
+// into two parts base on previousMinLevel. Portals with level >= 
+// previousMinLevel will return as result and continue to render. 
+// Others will save to portalsPreviousMinLevel. If there is no more 
+// active request of map data, portals will not split and 
+// portalsPreviousMinLevel will add back to result and render base on 
+// current minLevel. 
+//
+// "handleFailRequest" is added to handle the case when the last request 
+// failed and "processPortals" didn't get called. It will get
+// portalsPreviousMinLevel base on current minLevel and render them.
 //
 // "getMinLevel" will be called by "getMinPortalLevel" in utils_misc.js 
 // to determine min portal level to draw on map.
@@ -28,12 +41,25 @@ window.portalRenderLimit = function() {}
 window.portalRenderLimit.initialized = false;
 window.portalRenderLimit.minLevelSet = false;
 window.portalRenderLimit.minLevel = -1;
+window.portalRenderLimit.previousMinLevel = -1;
+window.portalRenderLimit.previousZoomLevel;
 window.portalRenderLimit.newPortalsPerLevel = new Array(MAX_PORTAL_LEVEL + 1);
+window.portalRenderLimit.portalsPreviousMinLevel = new Array(MAX_PORTAL_LEVEL + 1);
 
 window.portalRenderLimit.init = function () {
+  var currentZoomLevel = map.getZoom();
+  if(!portalRenderLimit.previousZoomLevel) portalRenderLimit.previousZoomLevel = currentZoomLevel;
+  if(portalRenderLimit.minLevelSet) {
+    var zoomDiff = currentZoomLevel - portalRenderLimit.previousZoomLevel;
+    portalRenderLimit.previousMinLevel = Math.max(portalRenderLimit.minLevel - zoomDiff, -1);
+    portalRenderLimit.previousMinLevel = Math.min(portalRenderLimit.previousMinLevel, MAX_PORTAL_LEVEL);
+  }
+  portalRenderLimit.previousZoomLevel = currentZoomLevel;
+  
   portalRenderLimit.initialized = true;
   portalRenderLimit.minLevel = -1;
   portalRenderLimit.resetCounting();
+  portalRenderLimit.resetPortalsPreviousMinLevel();
 }
 
 window.portalRenderLimit.resetCounting = function() {
@@ -43,7 +69,45 @@ window.portalRenderLimit.resetCounting = function() {
   }
 }
 
-window.portalRenderLimit.pushPortal = function(ent) {
+window.portalRenderLimit.resetPortalsPreviousMinLevel = function() {
+  for(var i = 0; i <= MAX_PORTAL_LEVEL; i++) {
+    portalRenderLimit.portalsPreviousMinLevel[i] = new Array();
+  }
+}
+
+window.portalRenderLimit.processPortals = function(ppp) {
+  portalRenderLimit.resetCounting();
+  var resultPortals = new Array();
+
+  $.each(ppp, function(ind, portal) {
+    portalRenderLimit.countPortal(portal);
+
+    if(!portalRenderLimit.isLastRequest()) {
+      var portalLevel = parseInt(getPortalLevel(portal[2]));
+      if(portalLevel < portalRenderLimit.previousMinLevel) {
+        portalRenderLimit.portalsPreviousMinLevel[portalLevel].push(portal);
+      }else{
+        resultPortals.push(portal);
+      }
+    }
+  });
+
+  if(portalRenderLimit.isLastRequest()) {
+    resultPortals = portalRenderLimit.getLowLevelPortals(ppp);
+    portalRenderLimit.resetPortalsPreviousMinLevel();
+  }
+  return resultPortals;
+}
+
+window.portalRenderLimit.handleFailRequest = function() {
+  if(portalRenderLimit.isLastRequest()) {
+    var ppp = portalRenderLimit.getLowLevelPortals(null);
+    portalRenderLimit.resetPortalsPreviousMinLevel();
+    handlePortalData(ppp);
+  }
+}
+
+window.portalRenderLimit.countPortal = function(ent) {
   var portalGuid = ent[0];
   var portalLevel = parseInt(getPortalLevel(ent[2]));
   var layerGroup = portalsLayers[portalLevel];
@@ -52,6 +116,27 @@ window.portalRenderLimit.pushPortal = function(ent) {
   portalRenderLimit.newPortalsPerLevel[portalLevel]++;
 }
 
+window.portalRenderLimit.getLowLevelPortals = function(appendTo) {
+  var resultPortals = appendTo ? appendTo : new Array();
+  for(var i = portalRenderLimit.getMinLevel(); 
+      i < portalRenderLimit.previousMinLevel; 
+     i++) {
+    $.merge(resultPortals, portalRenderLimit.portalsPreviousMinLevel[i]);
+  }
+  return resultPortals;
+}
+
+window.portalRenderLimit.isLastRequest = function() {
+  var result = true;
+  $.each(window.activeRequests, function(ind, req) {
+    if(req.action === 'getThinnedEntitiesV2') {
+      result = false;
+      return false;
+    }
+  });
+  return result;
+}
+
 window.portalRenderLimit.getMinLevel = function() {
   if(!portalRenderLimit.initialized) return -1;
   if(!portalRenderLimit.minLevelSet) portalRenderLimit.setMinLevel();

code/utils_misc.js

@@ -58,7 +58,7 @@ window.postAjax = function(action, data, success, error) {
   data = JSON.stringify($.extend({method: 'dashboard.'+action}, data));
   var remove = function(data, textStatus, jqXHR) { window.requests.remove(jqXHR); };
   var errCnt = function(jqXHR) { window.failedRequestCount++; window.requests.remove(jqXHR); };
-  return $.ajax({
+  var result = $.ajax({
     // use full URL to avoid issues depending on how people set their
     // slash. See:
     // https://github.com/breunigs/ingress-intel-total-conversion/issues/56
@@ -73,6 +73,8 @@ window.postAjax = function(action, data, success, error) {
       req.setRequestHeader('X-CSRFToken', readCookie('csrftoken'));
     }
   });
+  result.action = action;
+  return result;
 }
 
 // converts unix timestamps to HH:mm:ss format if it was today;