From 6e6fdadcf2d85162650d01d9057ea3054609c6fa Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marcel=20M=C3=BCller?= <marcel-mueller@gmx.de>
Date: Sun, 10 Mar 2024 12:35:31 +0100
Subject: [PATCH] Prefetch reference data
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Marcel Müller <marcel-mueller@gmx.de>
---
 NextcloudTalk/BaseChatViewController.swift | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/NextcloudTalk/BaseChatViewController.swift b/NextcloudTalk/BaseChatViewController.swift
index aa6889d79..a6cee14c6 100644
--- a/NextcloudTalk/BaseChatViewController.swift
+++ b/NextcloudTalk/BaseChatViewController.swift
@@ -49,7 +49,8 @@ import QuickLook
                                                   FileMessageTableViewCellDelegate,
                                                   LocationMessageTableViewCellDelegate,
                                                   ObjectShareMessageTableViewCellDelegate,
-                                                  ChatMessageTableViewCellDelegate {
+                                                  ChatMessageTableViewCellDelegate,
+                                                  UITableViewDataSourcePrefetching {
 
     // MARK: - Internal var
     internal var messages: [Date: [NCChatMessage]] = [:]
@@ -195,6 +196,7 @@ import QuickLook
         self.hidesBottomBarWhenPushed = true
         self.tableView?.estimatedRowHeight = 0
         self.tableView?.estimatedSectionHeaderHeight = 0
+        self.tableView?.prefetchDataSource = self
 
         FilePreviewImageView.setSharedImageDownloader(NCAPIController.sharedInstance().imageDownloader)
         NotificationCenter.default.addObserver(self, selector: #selector(willShowKeyboard(notification:)), name: UIWindow.keyboardWillShowNotification, object: nil)
@@ -2513,6 +2515,20 @@ import QuickLook
         return headerView
     }
 
+    public func tableView(_ tableView: UITableView, prefetchRowsAt indexPaths: [IndexPath]) {
+        guard tableView == self.tableView else { return }
+
+        for indexPath in indexPaths {
+            guard let message = self.message(for: indexPath) else { continue }
+
+            DispatchQueue.global(qos: .userInitiated).async {
+                if message.containsURL() {
+                    message.getReferenceData()
+                }
+            }
+        }
+    }
+
     public override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
         if tableView != self.autoCompletionView,
            let message = self.message(for: indexPath) {