From 5eaf563b96f4661f66847b143c82e81273171b66 Mon Sep 17 00:00:00 2001
From: Diogo <diogofncunha@gmail.com>
Date: Wed, 6 Nov 2024 11:15:51 +0000
Subject: [PATCH] jump to bottom

---
 apps/ios/Shared/Model/SimpleXAPI.swift    |  1 +
 apps/ios/Shared/Views/Chat/ChatView.swift | 16 +++++++++++++---
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/apps/ios/Shared/Model/SimpleXAPI.swift b/apps/ios/Shared/Model/SimpleXAPI.swift
index a442089ca9..45ac944e3d 100644
--- a/apps/ios/Shared/Model/SimpleXAPI.swift
+++ b/apps/ios/Shared/Model/SimpleXAPI.swift
@@ -320,6 +320,7 @@ private func apiChatsResponse(_ r: ChatResponse) throws -> [ChatData] {
 
 let loadItemsPerPage = 50
 let preloadItem = 8
+let idealChatListSize = 500
 
 func apiGetChat(type: ChatType, id: Int64, search: String = "") async throws -> (Chat, Int?) {
     let r = await chatSendCmd(.apiGetChat(type: type, id: id, pagination: .initial(count: loadItemsPerPage), search: search))
diff --git a/apps/ios/Shared/Views/Chat/ChatView.swift b/apps/ios/Shared/Views/Chat/ChatView.swift
index 5f06a28452..8e3d41ae10 100644
--- a/apps/ios/Shared/Views/Chat/ChatView.swift
+++ b/apps/ios/Shared/Views/Chat/ChatView.swift
@@ -75,7 +75,7 @@ struct ChatView: View {
             VStack(spacing: 0) {
                 ZStack(alignment: .bottomTrailing) {
                     chatItemsList()
-                    FloatingButtons(theme: theme, scrollModel: scrollModel, chat: chat)
+                    FloatingButtons(theme: theme, scrollModel: scrollModel, chat: chat, onScrollToBottom: onScrollToBottom)
                 }
                 connectingText()
                 if selectedChatItems == nil {
@@ -476,6 +476,15 @@ struct ChatView: View {
         }
     }
     
+    private func onScrollToBottom() {
+        scrollModel.scrollToBottom()
+        if let g = im.gap {
+            let sliceSize = min(g.index, idealChatListSize)
+            im.gap = nil
+            im.reversedChatItems = Array(im.reversedChatItems[..<sliceSize])
+        }
+    }
+    
     private func getFirstUnreadItem() -> ChatItem? {
         logger.error("[scrolling] \(im.reversedChatItems.count)")
 
@@ -571,6 +580,7 @@ struct ChatView: View {
         let theme: AppTheme
         let scrollModel: ReverseListScrollModel
         let chat: Chat
+        let onScrollToBottom: () -> Void
         @ObservedObject var model = FloatingButtonModel.shared
 
         var body: some View {
@@ -611,14 +621,14 @@ struct ChatView: View {
                                 .foregroundColor(theme.colors.primary)
                         }
                         .onTapGesture {
-                            scrollModel.scrollToBottom()
+                            onScrollToBottom()
                         }
                     } else if !model.isNearBottom {
                         circleButton {
                             Image(systemName: "chevron.down")
                                 .foregroundColor(theme.colors.primary)
                         }
-                        .onTapGesture { scrollModel.scrollToBottom() }
+                        .onTapGesture { onScrollToBottom() }
                     }
                 }
                 .padding()