From 56672d604e89f9308085254a9d34cba23dafbd6f Mon Sep 17 00:00:00 2001
From: SBiOSoftWhare <steveb@matrix.org>
Date: Fri, 27 Jul 2018 18:45:23 +0200
Subject: [PATCH] [EventFormatter] Handle room create predecessor string
 building

---
 Riot/Utils/EventFormatter.m | 46 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 45 insertions(+), 1 deletion(-)

diff --git a/Riot/Utils/EventFormatter.m b/Riot/Utils/EventFormatter.m
index 2015a9bbc..bfd7fdfd2 100644
--- a/Riot/Utils/EventFormatter.m
+++ b/Riot/Utils/EventFormatter.m
@@ -114,7 +114,12 @@ NSString *const kEventFormatterOnReRequestKeysLinkActionSeparator = @"/";
             return [self renderString:displayText forEvent:event];
         }
     }
-
+    
+    if (event.eventType == MXEventTypeRoomCreate && roomState.hasRoomPredecessor)
+    {
+        return [self roomCreatePredecessorAttributedStringFromRoomCreateContent:roomState.roomCreateContent];
+    }
+    
     NSAttributedString *attributedString = [super attributedStringFromEvent:event withRoomState:roomState error:error];
 
     if (event.sentState == MXEventSentStateSent
@@ -552,4 +557,43 @@ NSString *const kEventFormatterOnReRequestKeysLinkActionSeparator = @"/";
     }
 }
 
+#pragma mark - Room create predecessor
+
+- (NSAttributedString*)roomCreatePredecessorAttributedStringFromRoomCreateContent:(MXRoomCreateContent*)roomCreateContent
+{
+    if (!roomCreateContent)
+    {
+        return nil;
+    }
+    
+    NSString *predecessorRoomId = roomCreateContent.roomPredecessorInfo.roomId;
+    NSString *predecessorRoomPermalink = [MXTools permalinkToRoom:predecessorRoomId];
+    
+    NSDictionary *roomPredecessorReasonAttributes = @{
+                                                      NSFontAttributeName : self.defaultTextFont
+                                                      };
+    
+    NSDictionary *roomLinkAttributes = @{
+                                         NSFontAttributeName : self.defaultTextFont,
+                                         NSUnderlineStyleAttributeName : @(NSUnderlineStyleSingle),
+                                         NSLinkAttributeName : predecessorRoomPermalink,
+                                         };
+    
+    NSMutableAttributedString *roomPredecessorAttributedString = [NSMutableAttributedString new];
+    
+    NSString *roomPredecessorReasonString = [NSString stringWithFormat:@"%@\n", NSLocalizedStringFromTable(@"room_predecessor_information", @"Vector", nil)];
+    NSAttributedString *roomPredecessorReasonAttributedString = [[NSAttributedString alloc] initWithString:roomPredecessorReasonString attributes:roomPredecessorReasonAttributes];
+    
+    NSString *predecessorRoomLinkString = NSLocalizedStringFromTable(@"room_predecessor_link", @"Vector", nil);
+    NSAttributedString *predecessorRoomLinkAttributedString = [[NSAttributedString alloc] initWithString:predecessorRoomLinkString attributes:roomLinkAttributes];
+    
+    [roomPredecessorAttributedString appendAttributedString:roomPredecessorReasonAttributedString];
+    [roomPredecessorAttributedString appendAttributedString:predecessorRoomLinkAttributedString];
+    
+    NSRange wholeStringRange = NSMakeRange(0, roomPredecessorAttributedString.length);
+    [roomPredecessorAttributedString addAttribute:NSForegroundColorAttributeName value:self.defaultTextColor range:wholeStringRange];
+    
+    return roomPredecessorAttributedString;
+}
+
 @end