Option to customize the date separation logic in the message list

Author: martinmitrevski

CHANGELOG.md

@@ -5,6 +5,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ### ✅ Added
 - Added factory method for customizing the message list container's modifier
+- Option to customize the date separation logic in the message list
 
 # [4.33.0](https://github.com/GetStream/stream-chat-swiftui/releases/tag/4.33.0)
 _June 09, 2023_

Sources/StreamChatSwiftUI/ChatChannel/MessageList/MessageListConfig.swift

@@ -101,6 +101,7 @@ public struct MessageDisplayOptions {
     public let messageLinkDisplayResolver: (ChatMessage) -> [NSAttributedString.Key: Any]
     public let spacerWidth: (CGFloat) -> CGFloat
     public let reactionsTopPadding: (ChatMessage) -> CGFloat
+    public let dateSeparator: (ChatMessage, ChatMessage) -> Date?
 
     public init(
         showAvatars: Bool = true,
@@ -118,7 +119,8 @@ public struct MessageDisplayOptions {
         messageLinkDisplayResolver: @escaping (ChatMessage) -> [NSAttributedString.Key: Any] = MessageDisplayOptions
             .defaultLinkDisplay,
         spacerWidth: @escaping (CGFloat) -> CGFloat = MessageDisplayOptions.defaultSpacerWidth,
-        reactionsTopPadding: @escaping (ChatMessage) -> CGFloat = MessageDisplayOptions.defaultReactionsTopPadding
+        reactionsTopPadding: @escaping (ChatMessage) -> CGFloat = MessageDisplayOptions.defaultReactionsTopPadding,
+        dateSeparator: @escaping (ChatMessage, ChatMessage) -> Date? = MessageDisplayOptions.defaultDateSeparator
     ) {
         self.showAvatars = showAvatars
         self.showAuthorName = showAuthorName
@@ -135,11 +137,25 @@ public struct MessageDisplayOptions {
         self.showAvatarsInGroups = showAvatarsInGroups ?? showAvatars
         self.reactionsTopPadding = reactionsTopPadding
         self.newMessagesSeparatorSize = newMessagesSeparatorSize
+        self.dateSeparator = dateSeparator
     }
 
     public func showAvatars(for channel: ChatChannel) -> Bool {
         channel.isDirectMessageChannel ? showAvatars : showAvatarsInGroups
     }
+    
+    public static func defaultDateSeparator(message: ChatMessage, previous: ChatMessage) -> Date? {
+        let isDifferentDay = !Calendar.current.isDate(
+            message.createdAt,
+            equalTo: previous.createdAt,
+            toGranularity: .day
+        )
+        if isDifferentDay {
+            return message.createdAt
+        } else {
+            return nil
+        }
+    }
 
     public static var defaultLinkDisplay: (ChatMessage) -> [NSAttributedString.Key: Any] {
         { _ in

Sources/StreamChatSwiftUI/ChatChannel/MessageList/MessageListDateUtils.swift

@@ -63,16 +63,9 @@ class MessageListDateUtils {
         let previousIndex = index + 1
         if previousIndex < messages.count {
             let previous = messages[previousIndex]
-            let isDifferentDay = !Calendar.current.isDate(
-                message.createdAt,
-                equalTo: previous.createdAt,
-                toGranularity: .day
-            )
-            if isDifferentDay {
-                return message.createdAt
-            } else {
-                return nil
-            }
+            return messageListConfig
+                .messageDisplayOptions
+                .dateSeparator(message, previous)
         } else {
             return message.createdAt
         }