[Spaces] Show spaces in left panel #4509

- Display the none hierarchical list of spaces in the left panel
- Space switching when new space selected
- Refresh space list and recents data after sync

Riot/Modules/Common/Recents/DataSources/RecentsDataSource.m

@@ -98,10 +98,16 @@ NSString *const kRecentsDataSourceTapOnDirectoryServerChange = @"kRecentsDataSou
         
         // Set default data and view classes
         [self registerCellDataClass:RecentCellData.class forCellIdentifier:kMXKRecentCellIdentifier];
+        
+        [self registerSpaceServiceDidBuildGraphNotification];
     }
     return self;
 }
 
+- (void)dealloc
+{
+    [self unregisterSpaceServiceDidBuildGraphNotification];
+}
 
 #pragma mark - Properties
 
@@ -166,6 +172,13 @@ NSString *const kRecentsDataSourceTapOnDirectoryServerChange = @"kRecentsDataSou
     return state.unsentMessagesGroupDiscussionsCount;
 }
 
+- (void)setCurrentSpace:(MXSpace *)currentSpace
+{
+    _currentSpace = currentSpace;
+    [self refreshRoomsSection:^{
+        [self.delegate dataSource:self didCellChange:nil];
+    }];
+}
 
 #pragma mark -
 
@@ -213,6 +226,23 @@ NSString *const kRecentsDataSourceTapOnDirectoryServerChange = @"kRecentsDataSou
     return stickyHeader;
 }
 
+#pragma mark - Space Service notifications
+
+- (void)registerSpaceServiceDidBuildGraphNotification
+{
+    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(spaceServiceDidBuildGraphNotification:) name:MXSpaceService.didBuildSpaceGraph object:nil];
+}
+
+- (void)spaceServiceDidBuildGraphNotification:(NSNotification*)notification
+{
+    [self forceRefresh];
+}
+
+- (void)unregisterSpaceServiceDidBuildGraphNotification
+{
+    [[NSNotificationCenter defaultCenter] removeObserver:self name:MXSpaceService.didBuildSpaceGraph object:nil];
+}
+
 #pragma mark - Key backup setup banner
 
 - (void)registerKeyBackupStateDidChangeNotification
@@ -1204,7 +1234,10 @@ NSString *const kRecentsDataSourceTapOnDirectoryServerChange = @"kRecentsDataSou
         for (NSUInteger index = 0; index < count; index++)
         {
             id<MXKRecentCellDataStoring> cell = [recentsDataSource cellDataAtIndex:index];
-            [cells addObject:cell];
+            if (self.currentSpace == nil || [self.currentSpace isRoomAChildWithRoomId:cell.roomSummary.roomId])
+            {
+                [cells addObject:cell];
+            }
         }
         
         MXWeakify(self);