Added configuration of message size via spacing

Author: martinmitrevski

CHANGELOG.md

@@ -7,6 +7,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Customizing padding for message bubble modifier
 - Customizing padding for message text view
 - Possibility to control tab bar visibility
+- Configuration of message size via spacing
 
 ### 🐞 Fixed
 - Fixed a bug with canceled backswipe

Sources/StreamChatSwiftUI/ChatChannel/MessageList/MessageContainerView.swift

@@ -244,12 +244,7 @@ public struct MessageContainerView<Factory: ViewFactory>: View {
     }
 
     private var spacerWidth: CGFloat {
-        let proposedViewWidth = width ?? 0
-        if isIPad {
-            return 2 * proposedViewWidth / 3
-        } else {
-            return proposedViewWidth / 4
-        }
+        messageListConfig.messageDisplayOptions.spacerWidth(width ?? 0)
     }
 
     private var reactionsShown: Bool {

Sources/StreamChatSwiftUI/ChatChannel/MessageList/MessageListConfig.swift

@@ -85,6 +85,7 @@ public struct MessageDisplayOptions {
     public let otherUserMessageTransition: AnyTransition
     public let shouldAnimateReactions: Bool
     public let messageLinkDisplayResolver: (ChatMessage) -> [NSAttributedString.Key: Any]
+    public let spacerWidth: (CGFloat) -> CGFloat
 
     public init(
         showAvatars: Bool = true,
@@ -98,7 +99,8 @@ public struct MessageDisplayOptions {
         otherUserMessageTransition: AnyTransition = .identity,
         shouldAnimateReactions: Bool = true,
         messageLinkDisplayResolver: @escaping (ChatMessage) -> [NSAttributedString.Key: Any] = MessageDisplayOptions
-            .defaultLinkDisplay
+            .defaultLinkDisplay,
+        spacerWidth: @escaping (CGFloat) -> CGFloat = MessageDisplayOptions.defaultSpacerWidth
     ) {
         self.showAvatars = showAvatars
         self.showAuthorName = showAuthorName
@@ -111,6 +113,7 @@ public struct MessageDisplayOptions {
         self.messageLinkDisplayResolver = messageLinkDisplayResolver
         self.lastInGroupHeaderSize = lastInGroupHeaderSize
         self.shouldAnimateReactions = shouldAnimateReactions
+        self.spacerWidth = spacerWidth
     }
 
     public static var defaultLinkDisplay: (ChatMessage) -> [NSAttributedString.Key: Any] {
@@ -120,6 +123,16 @@ public struct MessageDisplayOptions {
             ]
         }
     }
+    
+    public static var defaultSpacerWidth: (CGFloat) -> (CGFloat) {
+        { availableWidth in
+            if isIPad {
+                return 2 * availableWidth / 3
+            } else {
+                return availableWidth / 4
+            }
+        }
+    }
 }
 
 /// Type of message list. Currently only `messaging` is supported.