End-to-end encryption UI/UX

#723

- Define bubbles cells used to displayed encrypted events

Vector/Views/RoomBubbleList/Encryption/RoomEncryptedDataBubbleCell.h

@@ -0,0 +1,43 @@
+/*
+ Copyright 2016 OpenMarket Ltd
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ */
+
+#import <MatrixKit/MatrixKit.h>
+
+/**
+ Action identifier used when the user tapped on the marker displayed in front of an encrypted event.
+ 
+ The `userInfo` dictionary contains an `MXEvent` object under the `kMXKRoomBubbleCellEventKey` key, representing the encrypted event.
+ */
+extern NSString *const kRoomEncryptedDataBubbleCellTapOnEncryptionIcon;
+
+/**
+ `RoomEncryptedDataBubbleCell` defines static methods used to handle the encrypted data in bubbles.
+ */
+@interface RoomEncryptedDataBubbleCell : NSObject
+
+/**
+ Return the icon displayed in front an event in an encrypted room .
+ 
+ @param event the event.
+ @param session the matrix session
+ */
++ (UIImage*)encryptionIconForEvent:(MXEvent*)event andSession:(MXSession*)session;
+
+@end
+
+
+
+