fix: reach start in message feed

src/routes/chat/Layout/VirtualMessageFeed/index.tsx

@@ -64,8 +64,9 @@ const VirtualMessageFeed = ({ context, id }: Props) => {
     // }, [mids]);
 
     // 加载更多
-    const handleLoadMore = useCallback(() => {
-        console.log("reach start ");
+    const handleTopStateChange = (isTop: boolean) => {
+        console.log("reach top ", isTop);
+        if (isTop) {
             if (historyMid === "reached") return;
             let lastMid = mids.slice(0, 1)[0];
             if (historyMid) {
@@ -73,8 +74,8 @@ const VirtualMessageFeed = ({ context, id }: Props) => {
             }
             // prevMids = mids;
             loadMoreMessage({ context, id, mid: lastMid });
-        // return false;
-    }, [mids, context, id]);
+        }
+    };
     // 自动跟随
     const handleFollowOutput = (isAtBottom: boolean) => {
         const [lastMid] = mids ? mids.slice(-1) : [0];
@@ -112,9 +113,10 @@ const VirtualMessageFeed = ({ context, id }: Props) => {
             }}
             // firstItemIndex={firstItemIndex}
             initialTopMostItemIndex={mids.length - 1}
-            startReached={handleLoadMore}
+            // startReached={handleLoadMore}
             data={mids}
             atTopThreshold={context == "channel" ? 160 : 0}
+            atTopStateChange={handleTopStateChange}
             atBottomStateChange={handleBottomStateChange}
             atBottomThreshold={400}
             followOutput={handleFollowOutput}