Prepare UX Rework:

- Define the 4 tabs: Home, Fav, People and Rooms

Riot/Model/RoomList/RecentsDataSource.h

@@ -1,5 +1,6 @@
 /*
  Copyright 2015 OpenMarket Ltd
+ Copyright 2017 Vector Creations Ltd
 
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
@@ -16,12 +17,72 @@
 
 #import <MatrixKit/MatrixKit.h>
 
-@class PublicRoomsDirectoryDataSource;
+#import "PublicRoomsDirectoryDataSource.h"
 
 /**
- 'RecentsDataSource' class inherits from 'MXKInterleavedRecentsDataSource' to define Vector recents source.
+ List the different modes used to prepare the recents data source.
+ Each mode corresponds to an application tab: Home, Favourites, People and Rooms.
+ */
+typedef enum : NSUInteger
+{
+    RecentsDataSourceModeHome,
+    RecentsDataSourceModeFavourites,
+    RecentsDataSourceModePeople,
+    RecentsDataSourceModeRooms
+    
+} RecentsDataSourceMode;
+
+/**
+ 'RecentsDataSource' class inherits from 'MXKInterleavedRecentsDataSource' to define the Riot recents source
+ shared between all the applications tabs.
  */
 @interface RecentsDataSource : MXKInterleavedRecentsDataSource
+{
+@protected
+    NSInteger directorySection;
+    NSInteger invitesSection;
+    NSInteger favoritesSection;
+    NSInteger conversationSection;
+    NSInteger lowPrioritySection;
+    
+    NSInteger sectionsCount;
+}
+
+/**
+ Set the delegate by specifying the selected display mode.
+ */
+- (void)setDelegate:(id<MXKDataSourceDelegate>)delegate andRecentsDataSourceMode:(RecentsDataSourceMode)recentsDataSourceMode;
+
+/**
+ The current mode (RecentsDataSourceModeHome by default).
+ */
+@property (nonatomic, readonly) RecentsDataSourceMode recentsDataSourceMode;
+
+/**
+ The data source used to manage the rooms from directory.
+ */
+@property (nonatomic) PublicRoomsDirectoryDataSource *publicRoomsDirectoryDataSource;
+
+/**
+ Refresh the recents data source and notify its delegate.
+ */
+- (void)forceRefresh;
+
+/**
+ Tell whether the sections are shrinkable. NO by default.
+ */
+@property (nonatomic) BOOL areSectionsShrinkable;
+
+#pragma mark - Drag & Drop handling
+/**
+ Return true of the cell can be moved from a section to another one.
+ */
+- (BOOL)isDraggableCellAt:(NSIndexPath*)path;
+
+/**
+ Return true of the cell can be moved from a section to another one.
+ */
+- (BOOL)canCellMoveFrom:(NSIndexPath*)oldPath to:(NSIndexPath*)newPath;
 
 /**
  There is a pending drag and drop cell.
@@ -40,36 +101,6 @@
  */
 @property (nonatomic) UIImageView* droppingCellBackGroundView;
 
-/**
- The data source used to manage search in public rooms.
- */
-@property (nonatomic, readonly) PublicRoomsDirectoryDataSource *publicRoomsDirectoryDataSource;
-
-/**
- Hide the public rooms directory cell. YES by default.
- */
-@property (nonatomic) BOOL hidePublicRoomsDirectory;
-
-/**
- Hide recents. NO by default.
- */
-@property (nonatomic) BOOL hideRecents;
-
-/**
- Return the header height from the section.
- */
-- (CGFloat)heightForHeaderInSection:(NSInteger)section;
-
-/**
- Return true of the cell can be moved from a section to another one.
- */
-- (BOOL)isDraggableCellAt:(NSIndexPath*)path;
-
-/**
- Return true of the cell can be moved from a section to another one.
- */
-- (BOOL)canCellMoveFrom:(NSIndexPath*)oldPath to:(NSIndexPath*)newPath;
-
 /**
  Move a cell from a path to another one.
  It is based on room Tag.