opt anim

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

lib/common/widgets/image_viewer/hero.dart

@@ -0,0 +1,26 @@
+import 'package:flutter/widgets.dart';
+
+Widget fromHero({
+  required Object tag,
+  required Widget child,
+}) => Hero(
+  tag: tag,
+  createRectTween: createEndRectTween,
+  child: child,
+);
+
+RectTween createEndRectTween(Rect? begin, Rect? end) {
+  if (begin != null && end != null) {
+    final endWidth = end.width;
+    final endHeight = end.height;
+    // TODO: use real image rect
+    final beginRect = Rect.fromLTWH(
+      begin.left + (begin.width - endWidth) / 2,
+      begin.top + (begin.height - endHeight) / 2,
+      endWidth,
+      endHeight,
+    );
+    return RectTween(begin: beginRect, end: end);
+  }
+  return RectTween(begin: begin, end: end);
+}