Add FunctionalAligner (#42)

Flutter-Bounty-Hunters · Nov 23, 2023 · 8cffc3f · 8cffc3f
1 parent 79367c2
commit 8cffc3f
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diff --git a/lib/src/follower.dart b/lib/src/follower.dart
@@ -128,6 +128,21 @@ class StaticOffsetAligner implements FollowerAligner {
   }
 }
 
+/// A [FollowerAligner] that delegates to a callback function.
+class FunctionalAligner implements FollowerAligner {
+  FunctionalAligner({
+    required this.delegate,
+  });
+
+  /// Called to determine the position of the [Follower].
+  final FollowerAlignment Function(Rect globalLeaderRect, Size followerSize) delegate;
+
+  @override
+  FollowerAlignment align(Rect globalLeaderRect, Size followerSize) {
+    return delegate(globalLeaderRect, followerSize);
+  }
+}
+
 class FollowerAlignment {
   const FollowerAlignment({
     required this.leaderAnchor,

diff --git a/test_goldens/goldens/follower_fade-when-out-of-bounds_bottom-left.png b/test_goldens/goldens/follower_fade-when-out-of-bounds_bottom-left.png
diff --git a/test_goldens/goldens/follower_fade-when-out-of-bounds_bottom-right.png b/test_goldens/goldens/follower_fade-when-out-of-bounds_bottom-right.png
diff --git a/test_goldens/goldens/follower_fade-when-out-of-bounds_top-left.png b/test_goldens/goldens/follower_fade-when-out-of-bounds_top-left.png
diff --git a/test_goldens/goldens/follower_fade-when-out-of-bounds_top-right.png b/test_goldens/goldens/follower_fade-when-out-of-bounds_top-right.png
diff --git a/test_goldens/goldens/follower_restricts-to-boundary_bottom-left.png b/test_goldens/goldens/follower_restricts-to-boundary_bottom-left.png
diff --git a/test_goldens/goldens/follower_restricts-to-boundary_bottom-right.png b/test_goldens/goldens/follower_restricts-to-boundary_bottom-right.png
diff --git a/test_goldens/goldens/follower_restricts-to-boundary_top-left.png b/test_goldens/goldens/follower_restricts-to-boundary_top-left.png
diff --git a/test_goldens/goldens/follower_restricts-to-boundary_top-right.png b/test_goldens/goldens/follower_restricts-to-boundary_top-right.png
diff --git a/test_goldens/goldens/follower_static_initial-placement_in-bounds_center.png b/test_goldens/goldens/follower_static_initial-placement_in-bounds_center.png
diff --git a/test_goldens/goldens/follower_static_no-fade-when-partial-overlap_bottom-left.png b/test_goldens/goldens/follower_static_no-fade-when-partial-overlap_bottom-left.png
diff --git a/test_goldens/goldens/follower_static_no-fade-when-partial-overlap_bottom-right.png b/test_goldens/goldens/follower_static_no-fade-when-partial-overlap_bottom-right.png
diff --git a/test_goldens/goldens/follower_static_no-fade-when-partial-overlap_top-left.png b/test_goldens/goldens/follower_static_no-fade-when-partial-overlap_top-left.png
diff --git a/test_goldens/goldens/follower_static_no-fade-when-partial-overlap_top-right.png b/test_goldens/goldens/follower_static_no-fade-when-partial-overlap_top-right.png