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lib/constants/message_constant.dart

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+class HistoryMessageDartConstant {
+  static const getCount = 20;
+
+  // ignore: constant_identifier_names
+  static const V2_TIM_IMAGE_TYPES = {
+    'ORIGINAL': 0,
+    'BIG': 1,
+    'SMALL': 2,
+  };
+
+  static Map<V2_TIM_IMAGE_TYPES_ENUM, List<String>> imgPriorMap = {
+    V2_TIM_IMAGE_TYPES_ENUM.original: oriImgPrior,
+    V2_TIM_IMAGE_TYPES_ENUM.big: bigImgPrior,
+    V2_TIM_IMAGE_TYPES_ENUM.small: smallImgPrior,
+  };
+
+  // 缩略图优先，大图次之，最后是原图
+  static const smallImgPrior = ['ORIGINAL', 'BIG', 'SMALL'];
+  // 大图优先，原图次之，最后是缩略图
+  static const bigImgPrior = ['SMALL', 'ORIGINAL', 'BIG'];
+  // 原图优先，大图次之，最后是缩略图
+  static const oriImgPrior = ['SMALL', 'BIG', 'ORIGINAL'];
+
+  // 视频、音频已读状态
+  static const int read = 1;
+}
+
+enum V2_TIM_IMAGE_TYPES_ENUM {
+  original,
+  big,
+  small,
+}
+
+enum IMG_PREVIEW_TYPE {
+  local,
+  url,
+}