End-to-end encryption UI/UX

#723

- Define bubbles cells used to displayed encrypted events

Vector/Views/RoomBubbleList/Encryption/RoomEncryptedDataBubbleCell.m

@@ -0,0 +1,66 @@
+/*
+ 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"RoomEncryptedDataBubbleCell.h"
+
+NSString *const kRoomEncryptedDataBubbleCellTapOnEncryptionIcon = @"kRoomEncryptedDataBubbleCellTapOnEncryptionIcon";
+
+@implementation RoomEncryptedDataBubbleCell
+
++ (UIImage*)encryptionIconForEvent:(MXEvent*)event andSession:(MXSession*)session
+{
+    NSString *encryptionIcon;
+    
+    if (!event.isEncrypted)
+    {
+        encryptionIcon = @"e2e_unencrypted";
+    }
+    else if (event.decryptionError)
+    {
+        encryptionIcon = @"e2e_blocked";
+    }
+    else
+    {
+        MXRoom *room = [session roomWithRoomId:event.roomId];
+        MXDeviceInfo *deviceInfo = [room eventDeviceInfo:event];
+        
+        switch (deviceInfo.verified)
+        {
+            case MXDeviceUnverified:
+            {
+                encryptionIcon = @"e2e_warning";
+                break;
+            }
+            case MXDeviceVerified:
+            {
+                encryptionIcon = @"e2e_verified";
+                break;
+            }
+            default:
+                break;
+        }
+    }
+    
+    if (!encryptionIcon)
+    {
+        // Use the warning icon by default
+        encryptionIcon = @"e2e_warning";
+    }
+    
+    return [UIImage imageNamed:encryptionIcon];
+}
+
+@end