迁移聊天室滚屏状态入口

resources/js/chat-room.js

@@ -249,7 +249,7 @@ export {
     updateRedPacketClaimsUI,
 } from "./chat-room/red-packet-panel.js";
 export { createMessageQueue } from "./chat-room/message-queue.js";
-export { isExpiredChatImageMessage, localClearScreen } from "./chat-room/message-utils.js";
+export { isExpiredChatImageMessage, localClearScreen, syncAutoScrollControls, toggleAutoScroll } from "./chat-room/message-utils.js";
 
 import { escapeHtml, escapeHtmlWithLineBreaks, normalizeSafeChatUrl } from "./chat-room/html.js";
 import { bindAppointmentAnnouncementControls, showAppointmentBanner } from "./chat-room/appointment-announcement.js";
@@ -442,7 +442,7 @@ import {
     updateRedPacketClaimsUI,
 } from "./chat-room/red-packet-panel.js";
 import { createMessageQueue } from "./chat-room/message-queue.js";
-import { isExpiredChatImageMessage, localClearScreen } from "./chat-room/message-utils.js";
+import { isExpiredChatImageMessage, localClearScreen, syncAutoScrollControls, toggleAutoScroll } from "./chat-room/message-utils.js";
 
 if (typeof window !== "undefined") {
     // 保留聚合入口，给新迁移模块、测试和仍在 Blade 内的存量脚本统一读取工具。
@@ -670,6 +670,8 @@ if (typeof window !== "undefined") {
         createMessageQueue,
         isExpiredChatImageMessage,
         localClearScreen,
+        syncAutoScrollControls,
+        toggleAutoScroll,
     };
 
     // 直接挂载只服务暂未迁移的 Blade 调用点；新代码优先通过模块导入或 ChatRoomTools 复用。
@@ -678,6 +680,7 @@ if (typeof window !== "undefined") {
     window.isExpiredChatImageMessage = isExpiredChatImageMessage;
     window.localClearScreen = localClearScreen;
     window.normalizeSafeChatUrl = normalizeSafeChatUrl;
+    window.syncAutoScrollControls = syncAutoScrollControls;
     window.openChatImageLightbox = openChatImageLightbox;
     window.closeFriendPanel = closeFriendPanel;
     window.friendSearch = friendSearch;

resources/js/chat-room/message-utils.js

@@ -78,3 +78,42 @@ export function localClearScreen(roomId = window.chatContext?.roomId, maxMessage
         publicPane.scrollTop = publicPane.scrollHeight;
     }
 }
+
+/**
+ * 同步自动滚屏复选框与状态文字。
+ *
+ * @param {boolean} enabled 是否开启自动滚屏
+ * @returns {void}
+ */
+export function syncAutoScrollControls(enabled) {
+    const checkbox = document.getElementById("auto_scroll");
+    const status = document.getElementById("scroll-status");
+
+    if (checkbox) {
+        checkbox.checked = enabled;
+    }
+
+    if (status) {
+        status.textContent = enabled ? "开" : "关";
+    }
+}
+
+/**
+ * 切换自动滚屏状态。
+ * 真实状态仍由 Blade 大脚本闭包保存，这里通过 getter/setter 桥接，避免 Vite 模块持有第二份状态。
+ *
+ * @param {() => boolean} getCurrent 读取当前状态
+ * @param {(enabled:boolean) => void} setCurrent 写回当前状态
+ * @returns {boolean}
+ */
+export function toggleAutoScroll(getCurrent, setCurrent) {
+    const nextEnabled = !Boolean(typeof getCurrent === "function" ? getCurrent() : true);
+
+    if (typeof setCurrent === "function") {
+        setCurrent(nextEnabled);
+    }
+
+    syncAutoScrollControls(nextEnabled);
+
+    return nextEnabled;
+}