refa: article (#757)

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/models/dynamics/opus_detail/pic.dart

@@ -0,0 +1,76 @@
+class Pic {
+  List<PicItem>? pics;
+  int? style;
+  String? url;
+  num? width;
+  double? height;
+  num? size;
+
+  Pic({
+    this.pics,
+    this.style,
+    this.url,
+    this.height,
+    this.width,
+    this.size,
+  });
+
+  factory Pic.fromJson(Map<String, dynamic> json) => Pic(
+        pics: (json['pics'] as List<dynamic>?)
+            ?.map((e) => PicItem.fromJson(e as Map<String, dynamic>))
+            .toList(),
+        style: json['style'] as int?,
+        url: json['url'],
+        height: (json['height'] as num?)?.toDouble(),
+        width: json['width'] as num?,
+        size: json['size'] as num?,
+      );
+
+  Map<String, dynamic> toJson() => {
+        'pics': pics?.map((e) => e.toJson()).toList(),
+        'style': style,
+        'height': height,
+        'width': width,
+        'size': size,
+        'url': url,
+      };
+}
+
+class PicItem {
+  num? height;
+  num? width;
+  num? size;
+  String? url;
+  String? liveUrl;
+  double? calHeight;
+
+  void onCalHeight(maxWidth) {
+    if (calHeight == null && height != null && width != null) {
+      calHeight = maxWidth * height! / width!;
+    }
+  }
+
+  PicItem({
+    this.height,
+    this.width,
+    this.size,
+    this.url,
+    this.liveUrl,
+  });
+
+  factory PicItem.fromJson(Map<String, dynamic> json) => PicItem(
+        height: json['height'] as num?,
+        width: json['width'] as num?,
+        size: json['size'] as num?,
+        url: json['url'] as String?,
+        liveUrl: json['live_url'] as String?,
+      );
+
+  Map<String, dynamic> toJson() => {
+        'height': height,
+        'width': width,
+        'size': size,
+        'url': url,
+        'live_url': liveUrl,
+      };
+}