mod: 支持系统消息查看，美化界面，点击清除未读提示，支持未读刷新

修复私信页点击视频后反复提示已读成功的问题

lib/pages/msg_feed_top/sys_msg/controller.dart

@@ -0,0 +1,63 @@
+import 'package:flutter_smart_dialog/flutter_smart_dialog.dart';
+import 'package:get/get.dart';
+import 'package:PiliPalaX/http/msg.dart';
+
+import '../../../models/msg/msgfeed_sys_msg.dart';
+
+class SysMsgController extends GetxController {
+  RxList<SystemNotifyList> msgFeedSysMsgList = <SystemNotifyList>[].obs;
+  bool isLoading = false;
+  int cursor = -1;
+  int cursorTime = -1;
+  bool isEnd = false;
+
+  Future queryMsgFeedSysMsg() async {
+    if (isLoading) return;
+    isLoading = true;
+    var resUserNotify = await MsgHttp.msgFeedSysUserNotify();
+    var resUnifiedNotify = await MsgHttp.msgFeedSysUnifiedNotify();
+    isLoading = false;
+    List<SystemNotifyList> systemNotifyList = [];
+    if (resUserNotify['status']) {
+      MsgFeedSysMsg data = MsgFeedSysMsg.fromJson(resUserNotify['data']);
+      if (data.systemNotifyList != null) {
+        systemNotifyList.addAll(data.systemNotifyList!);
+      }
+    }
+    if (resUnifiedNotify['status']) {
+      MsgFeedSysMsg data = MsgFeedSysMsg.fromJson(resUnifiedNotify['data']);
+      if (data.systemNotifyList != null) {
+        systemNotifyList.addAll(data.systemNotifyList!);
+      }
+    }
+    if (systemNotifyList.isNotEmpty) {
+      systemNotifyList.sort((a, b) => b.cursor!.compareTo(a.cursor!));
+      msgFeedSysMsgList.assignAll(systemNotifyList);
+      msgSysUpdateCursor(msgFeedSysMsgList.first.cursor!);
+    } else {
+      SmartDialog.showToast(
+          "UserNotify: ${resUserNotify['msg']} UnifiedNotify: ${resUnifiedNotify['msg']}");
+    }
+  }
+
+  Future msgSysUpdateCursor(int cursor) async {
+    var res = await MsgHttp.msgSysUpdateCursor(cursor);
+    if (res['status']) {
+      SmartDialog.showToast('已读成功');
+      return true;
+    } else {
+      SmartDialog.showToast(res['msg']);
+      return false;
+    }
+  }
+  Future onLoad() async {
+    if (isEnd) return;
+    queryMsgFeedSysMsg();
+  }
+
+  Future onRefresh() async {
+    cursor = -1;
+    cursorTime = -1;
+    queryMsgFeedSysMsg();
+  }
+}