WEB-29: Improve room page content loading

InitialSync: load the 30 last messages of each room so that a full page of messages can be displayed without additionnal request

webclient/components/matrix/event-handler-service.js

@@ -329,13 +329,29 @@ angular.module('eventHandlerService', [])
         },
 
         // Handle messages from /initialSync or /messages
-        handleRoomMessages: function(room_id, messages, isLiveEvents) {
+        handleRoomMessages: function(room_id, messages, isLiveEvents, dir) {
             initRoom(room_id);
-            this.handleEvents(messages.chunk, isLiveEvents);
+
+            var events = messages.chunk;
+
+            // Handles messages according to their time order
+            if (dir && 'b' === dir) {
+                // paginateBackMessages requests messages to be in reverse chronological order
+                for (var i=0; i<events.length; i++) {
+                    this.handleEvent(events[i], isLiveEvents, isLiveEvents);
+                }
                 
                 // Store how far back we've paginated
-            // This assumes the paginations requests are contiguous and in reverse chronological order
                 $rootScope.events.rooms[room_id].pagination.earliest_token = messages.end;
+            }
+            else {
+                // InitialSync returns messages in chronological order
+                for (var i=events.length - 1; i>=0; i--) {
+                    this.handleEvent(events[i], isLiveEvents, isLiveEvents);
+                }
+                // Store where to start pagination
+                $rootScope.events.rooms[room_id].pagination.earliest_token = messages.start;
+            }
         },
 
         handleInitialSyncDone: function(initialSyncData) {

webclient/components/matrix/event-stream-service.js

@@ -104,8 +104,10 @@ angular.module('eventStreamService', [])
         settings.isActive = true;
         var deferred = $q.defer();
 
-        // Initial sync: get all information and the last message of all rooms of the user
+        // Initial sync: get all information and the last 30 messages of all rooms of the user
-        matrixService.initialSync(1, false).then(
+        // 30 messages should be enough to display a full page of messages in a room
+        // without requiring to make an additional request
+        matrixService.initialSync(30, false).then(
             function(response) {
                 var rooms = response.data.rooms;
                 for (var i = 0; i < rooms.length; ++i) {

webclient/room/room-controller.js

@@ -235,7 +235,7 @@ angular.module('RoomController', ['ngSanitize', 'matrixFilter', 'mFileInput'])
         matrixService.paginateBackMessages($scope.room_id, $rootScope.events.rooms[$scope.room_id].pagination.earliest_token, numItems).then(
             function(response) {
 
-                eventHandlerService.handleRoomMessages($scope.room_id, response.data, false);
+                eventHandlerService.handleRoomMessages($scope.room_id, response.data, false, 'b');
                 if (response.data.chunk.length < MESSAGES_PER_PAGINATION) {
                     // no more messages to paginate. this currently never gets turned true again, as we never
                     // expire paginated contents in the current implementation.