From a11884ef2c1ed30d4aef08cc9773f1d0d341f70d Mon Sep 17 00:00:00 2001
From: alanpoon <brightshadowx@gmail.com>
Date: Fri, 11 Oct 2024 15:03:50 +0800
Subject: [PATCH 1/2] added send_pagination_request_based_on_scroll_pos

---
 src/home/room_screen.rs | 28 ++++++++++++++++++++++++----
 1 file changed, 24 insertions(+), 4 deletions(-)

diff --git a/src/home/room_screen.rs b/src/home/room_screen.rs
index 904f86c9..74cc8a51 100644
--- a/src/home/room_screen.rs
+++ b/src/home/room_screen.rs
@@ -1269,6 +1269,7 @@ impl Widget for RoomScreen {
             }
 
             // Handle sending any read receipts for the current logged-in user.
+            self.send_pagination_request_based_on_scroll_pos(cx, actions);
             self.send_user_read_receipts_based_on_scroll_pos(cx, actions);
 
             // Handle the cancel reply button being clicked.
@@ -1529,6 +1530,7 @@ impl RoomScreen {
     /// Redraws this RoomScreen view if any updates were applied.
     fn process_timeline_updates(&mut self, cx: &mut Cx) {
         let portal_list = self.portal_list(id!(list));
+        let top_space = self.view(id!(top_space));
         let curr_first_id = portal_list.first_id();
         let Some(tl) = self.tl_state.as_mut() else { return };
 
@@ -1613,14 +1615,14 @@ impl RoomScreen {
                         // log!("Timeline::handle_event(): changed_indices: {changed_indices:?}, items len: {}\ncontent drawn: {:#?}\nprofile drawn: {:#?}", items.len(), tl.content_drawn_since_last_update, tl.profile_drawn_since_last_update);
                     }
                     tl.items = new_items;
+                    done_loading = true;
                 }
                 TimelineUpdate::TimelineStartReached => {
                     log!("Timeline::handle_event(): timeline start reached for room {}", tl.room_id);
                     tl.fully_paginated = true;
-                    done_loading = true;
                 }
                 TimelineUpdate::PaginationIdle => {
-                    done_loading = true;
+                    top_space.set_visible(true);
                 }
                 TimelineUpdate::EventDetailsFetched {event_id, result } => {
                     if let Err(_e) = result {
@@ -1670,8 +1672,7 @@ impl RoomScreen {
         }
 
         if done_loading {
-            log!("TODO: hide topspace loading animation for room {}", tl.room_id);
-            // TODO FIXME: hide TopSpace loading animation, set it to invisible.
+            top_space.set_visible(false);
         }
         if num_updates > 0 {
             // log!("Applied {} timeline updates for room {}, redrawing with {} items...", num_updates, tl.room_id, tl.items.len());
@@ -1913,6 +1914,25 @@ impl RoomScreen {
         self.show_timeline(cx);
         self.label(id!(room_name)).set_text(&self.room_name);
     }
+    
+    /// Send Pagination Request when the scroll position is at the top 
+    fn send_pagination_request_based_on_scroll_pos(
+        &mut self,
+        cx: &mut Cx,
+        actions: &ActionsBuf,
+    ) {
+        let portal_list = self.portal_list(id!(list));
+        //stopped scrolling and when scroll position is at top
+        if portal_list.scrolled(actions) {
+            return;
+        }
+        
+        let Some(room_id) = self.room_id.as_ref() else { return };
+        if  portal_list.scroll_position() == 0.0 {
+            submit_async_request(MatrixRequest::PaginateRoomTimeline { room_id: room_id.clone(), num_events: 50, forwards: false});
+        }
+        
+    }
 }
 
 impl RoomScreenRef {

From bb93b3926637b9dd736e8487053eb2ddf8a2c742 Mon Sep 17 00:00:00 2001
From: alanpoon <brightshadowx@gmail.com>
Date: Fri, 11 Oct 2024 15:12:09 +0800
Subject: [PATCH 2/2] cleanup

---
 src/home/room_screen.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/home/room_screen.rs b/src/home/room_screen.rs
index 74cc8a51..4e675a13 100644
--- a/src/home/room_screen.rs
+++ b/src/home/room_screen.rs
@@ -1268,8 +1268,9 @@ impl Widget for RoomScreen {
                 }
             }
 
-            // Handle sending any read receipts for the current logged-in user.
+            // Set visibility of loading message banner based of pagination logic
             self.send_pagination_request_based_on_scroll_pos(cx, actions);
+            // Handle sending any read receipts for the current logged-in user.
             self.send_user_read_receipts_based_on_scroll_pos(cx, actions);
 
             // Handle the cancel reply button being clicked.