Fix "Support configurable hit test behavior on Draggable and DragTarget" (#74047)

AUTHORS

@@ -72,3 +72,4 @@ nt4f04uNd <nt4f04und@gmail.com>
 Anurag Roy <anuragr9847@gmail.com>
 Andrey Kabylin <andrey@kabylin.ru>
 vimerzhao <vimerzhao@gmail.com>
+Pedro Massango <pedromassango.developer@gmail.com>

packages/flutter/lib/src/widgets/drag_target.dart

@@ -199,6 +199,7 @@ class Draggable<T extends Object> extends StatefulWidget {
     this.onDragCompleted,
     this.ignoringFeedbackSemantics = true,
     this.rootOverlay = false,
+    this.hitTestBehavior = HitTestBehavior.deferToChild,
   }) : assert(child != null),
        assert(feedback != null),
        assert(ignoringFeedbackSemantics != null),
@@ -350,6 +351,11 @@ class Draggable<T extends Object> extends StatefulWidget {
   /// Defaults to false.
   final bool rootOverlay;
 
+  /// How to behave during hit test.
+  ///
+  /// Defaults to [HitTestBehavior.deferToChild].
+  final HitTestBehavior hitTestBehavior;
+
   /// Creates a gesture recognizer that recognizes the start of the drag.
   ///
   /// Subclasses can override this function to customize when they start
@@ -539,6 +545,7 @@ class _DraggableState<T extends Object> extends State<Draggable<T>> {
                          _activeCount < widget.maxSimultaneousDrags!;
     final bool showChild = _activeCount == 0 || widget.childWhenDragging == null;
     return Listener(
+      behavior: widget.hitTestBehavior,
       onPointerDown: canDrag ? _routePointer : null,
       child: showChild ? widget.child : widget.childWhenDragging,
     );
@@ -616,6 +623,7 @@ class DragTarget<T extends Object> extends StatefulWidget {
     this.onAcceptWithDetails,
     this.onLeave,
     this.onMove,
+    this.hitTestBehavior = HitTestBehavior.translucent,
   }) : super(key: key);
 
   /// Called to build the contents of this widget.
@@ -652,6 +660,11 @@ class DragTarget<T extends Object> extends StatefulWidget {
   /// Note that this includes entering and leaving the target.
   final DragTargetMove? onMove;
 
+  /// How to behave during hit testing.
+  ///
+  /// Defaults to [HitTestBehavior.translucent].
+  final HitTestBehavior hitTestBehavior;
+
   @override
   _DragTargetState<T> createState() => _DragTargetState<T>();
 }
@@ -727,7 +740,7 @@ class _DragTargetState<T extends Object> extends State<DragTarget<T>> {
     assert(widget.builder != null);
     return MetaData(
       metaData: this,
-      behavior: HitTestBehavior.translucent,
+      behavior: widget.hitTestBehavior,
       child: widget.builder(context, _mapAvatarsToData<T>(_candidateAvatars), _mapAvatarsToData<Object>(_rejectedAvatars)),
     );
   }

packages/flutter/test/widgets/draggable_test.dart

@@ -2874,6 +2874,48 @@ void main() {
     ), ignoreTransform: true, ignoreRect: true));
     semantics.dispose();
   });
+
+  testWidgets('configurable Draggable hit test behavior', (WidgetTester tester) async {
+    const HitTestBehavior hitTestBehavior = HitTestBehavior.deferToChild;
+
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Column(
+          children: <Widget>[
+            Draggable<int>(
+              hitTestBehavior: hitTestBehavior,
+              feedback: Container(height: 50.0, child: const Text('Draggable')),
+              child: Container(height: 50.0, child: const Text('Target')),
+            ),
+          ],
+        ),
+      ),
+    );
+
+    expect(tester.widget<Listener>(find.byType(Listener).first).behavior, hitTestBehavior);
+  });
+
+  testWidgets('configurable DragTarget hit test behavior', (WidgetTester tester) async {
+    const HitTestBehavior hitTestBehavior = HitTestBehavior.deferToChild;
+
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Column(
+          children: <Widget>[
+            DragTarget<int>(
+              hitTestBehavior: hitTestBehavior,
+              builder: (BuildContext context, List<int?> data,
+                  List<dynamic> rejects) {
+                return Container(height: 100.0, child: const Text('Target'));
+              },
+            ),
+          ],
+        ),
+      ),
+    );
+
+    expect(tester.widget<MetaData>(find.byType(MetaData)).behavior, hitTestBehavior);
+  });
 }
 
 Future<void> _testLongPressDraggableHapticFeedback({ required WidgetTester tester, required bool hapticFeedbackOnStart, required int expectedHapticFeedbackCount }) async {