diff --git a/examples/layers/rendering/touch_input.dart b/examples/layers/rendering/touch_input.dart
index 891e509fea..a1bed9e667 100644
--- a/examples/layers/rendering/touch_input.dart
+++ b/examples/layers/rendering/touch_input.dart
@@ -112,6 +112,7 @@ void main() {
   // The bottom later is our RenderDots object, and on top of that we show the
   // text.
   final RenderStack stack = new RenderStack(
+    textDirection: TextDirection.ltr,
     children: <RenderBox>[
       new RenderDots(),
       paragraph,
diff --git a/packages/flutter/lib/src/rendering/stack.dart b/packages/flutter/lib/src/rendering/stack.dart
index abc3c8f5c3..45a240bf35 100644
--- a/packages/flutter/lib/src/rendering/stack.dart
+++ b/packages/flutter/lib/src/rendering/stack.dart
@@ -297,16 +297,19 @@ class RenderStack extends RenderBox
   /// top left corners.
   RenderStack({
     List<RenderBox> children,
-    FractionalOffset alignment: FractionalOffset.topLeft,
+    FractionalOffsetGeometry alignment: FractionalOffsetDirectional.topStart,
+    @required TextDirection textDirection,
     StackFit fit: StackFit.loose,
-    Overflow overflow: Overflow.clip
+    Overflow overflow: Overflow.clip,
   }) : assert(alignment != null),
        assert(fit != null),
        assert(overflow != null),
        _alignment = alignment,
+       _textDirection = textDirection,
        _fit = fit,
        _overflow = overflow {
     addAll(children);
+    _applyUpdate();
   }
 
   bool _hasVisualOverflow = false;
@@ -317,19 +320,40 @@ class RenderStack extends RenderBox
       child.parentData = new StackParentData();
   }
 
+  // The resolved absolute insets.
+  FractionalOffset _resolvedAlignment;
+
+  void _applyUpdate() {
+    final FractionalOffset resolvedAlignment = alignment.resolve(textDirection);
+    if (_resolvedAlignment != resolvedAlignment) {
+      _resolvedAlignment = resolvedAlignment;
+      markNeedsLayout();
+    }
+  }
+
   /// How to align the non-positioned children in the stack.
   ///
   /// The non-positioned children are placed relative to each other such that
   /// the points determined by [alignment] are co-located. For example, if the
   /// [alignment] is [FractionalOffset.topLeft], then the top left corner of
   /// each non-positioned child will be located at the same global coordinate.
-  FractionalOffset get alignment => _alignment;
-  FractionalOffset _alignment;
-  set alignment(FractionalOffset value) {
+  FractionalOffsetGeometry get alignment => _alignment;
+  FractionalOffsetGeometry _alignment;
+  set alignment(FractionalOffsetGeometry value) {
     assert(value != null);
     if (_alignment != value) {
       _alignment = value;
-      markNeedsLayout();
+      _applyUpdate();
+    }
+  }
+
+  /// The text direction with which to resolve [alignment].
+  TextDirection get textDirection => _textDirection;
+  TextDirection _textDirection;
+  set textDirection(TextDirection value) {
+    if (_textDirection != value) {
+      _textDirection = value;
+      _applyUpdate();
     }
   }
 
@@ -455,7 +479,7 @@ class RenderStack extends RenderBox
       final StackParentData childParentData = child.parentData;
 
       if (!childParentData.isPositioned) {
-        childParentData.offset = alignment.alongOffset(size - child.size);
+        childParentData.offset = _resolvedAlignment.alongOffset(size - child.size);
       } else {
         BoxConstraints childConstraints = const BoxConstraints();
 
@@ -526,7 +550,8 @@ class RenderStack extends RenderBox
   @override
   void debugFillProperties(DiagnosticPropertiesBuilder description) {
     super.debugFillProperties(description);
-    description.add(new DiagnosticsProperty<FractionalOffset>('alignment', alignment));
+    description.add(new DiagnosticsProperty<FractionalOffsetGeometry>('alignment', alignment));
+    description.add(new EnumProperty<TextDirection>('textDirection', textDirection));
     description.add(new EnumProperty<StackFit>('fit', fit));
     description.add(new EnumProperty<Overflow>('overflow', overflow));
   }
@@ -543,11 +568,13 @@ class RenderIndexedStack extends RenderStack {
   /// If the [index] parameter is null, nothing is displayed.
   RenderIndexedStack({
     List<RenderBox> children,
-    FractionalOffset alignment: FractionalOffset.topLeft,
-    int index: 0
+    FractionalOffsetGeometry alignment: FractionalOffsetDirectional.topStart,
+    @required TextDirection textDirection,
+    int index: 0,
   }) : _index = index, super(
     children: children,
-    alignment: alignment
+    alignment: alignment,
+    textDirection: textDirection,
   );
 
   @override
diff --git a/packages/flutter/lib/src/widgets/basic.dart b/packages/flutter/lib/src/widgets/basic.dart
index 250f4b5e82..fd66107136 100644
--- a/packages/flutter/lib/src/widgets/basic.dart
+++ b/packages/flutter/lib/src/widgets/basic.dart
@@ -2193,7 +2193,8 @@ class Stack extends MultiChildRenderObjectWidget {
   /// top left corners.
   Stack({
     Key key,
-    this.alignment: FractionalOffset.topLeft,
+    this.alignment: FractionalOffsetDirectional.topStart,
+    this.textDirection,
     this.fit: StackFit.loose,
     this.overflow: Overflow.clip,
     List<Widget> children: const <Widget>[],
@@ -2205,7 +2206,12 @@ class Stack extends MultiChildRenderObjectWidget {
   /// the points determined by [alignment] are co-located. For example, if the
   /// [alignment] is [FractionalOffset.topLeft], then the top left corner of
   /// each non-positioned child will be located at the same global coordinate.
-  final FractionalOffset alignment;
+  final FractionalOffsetGeometry alignment;
+
+  /// The text direction with which to resolve [alignment].
+  ///
+  /// Defaults to the ambient [Directionality].
+  final TextDirection textDirection;
 
   /// How to size the non-positioned children in the stack.
   ///
@@ -2224,6 +2230,7 @@ class Stack extends MultiChildRenderObjectWidget {
   RenderStack createRenderObject(BuildContext context) {
     return new RenderStack(
       alignment: alignment,
+      textDirection: textDirection ?? Directionality.of(context),
       fit: fit,
       overflow: overflow,
     );
@@ -2233,6 +2240,7 @@ class Stack extends MultiChildRenderObjectWidget {
   void updateRenderObject(BuildContext context, RenderStack renderObject) {
     renderObject
       ..alignment = alignment
+      ..textDirection = textDirection ?? Directionality.of(context)
       ..fit = fit
       ..overflow = overflow;
   }
@@ -2240,7 +2248,8 @@ class Stack extends MultiChildRenderObjectWidget {
   @override
   void debugFillProperties(DiagnosticPropertiesBuilder description) {
     super.debugFillProperties(description);
-    description.add(new DiagnosticsProperty<FractionalOffset>('alignment', alignment));
+    description.add(new DiagnosticsProperty<FractionalOffsetGeometry>('alignment', alignment));
+    description.add(new EnumProperty<TextDirection>('textDirection', textDirection, defaultValue: null));
     description.add(new EnumProperty<StackFit>('fit', fit));
     description.add(new EnumProperty<Overflow>('overflow', overflow));
   }
@@ -2260,23 +2269,31 @@ class IndexedStack extends Stack {
   /// The [index] argument must not be null.
   IndexedStack({
     Key key,
-    FractionalOffset alignment: FractionalOffset.topLeft,
+    FractionalOffsetGeometry alignment: FractionalOffsetDirectional.topStart,
+    TextDirection textDirection,
     StackFit sizing: StackFit.loose,
     this.index: 0,
     List<Widget> children: const <Widget>[],
-  }) : super(key: key, alignment: alignment, fit: sizing, children: children);
+  }) : super(key: key, alignment: alignment, textDirection: textDirection, fit: sizing, children: children);
 
   /// The index of the child to show.
   final int index;
 
   @override
-  RenderIndexedStack createRenderObject(BuildContext context) => new RenderIndexedStack(index: index, alignment: alignment);
+  RenderIndexedStack createRenderObject(BuildContext context) {
+    return new RenderIndexedStack(
+      index: index,
+      alignment: alignment,
+      textDirection: textDirection ?? Directionality.of(context),
+    );
+  }
 
   @override
   void updateRenderObject(BuildContext context, RenderIndexedStack renderObject) {
     renderObject
       ..index = index
-      ..alignment = alignment;
+      ..alignment = alignment
+      ..textDirection = textDirection ?? Directionality.of(context);
   }
 }
 
diff --git a/packages/flutter/test/material/dropdown_test.dart b/packages/flutter/test/material/dropdown_test.dart
index 07c3d3fcf4..fbeac1bda6 100644
--- a/packages/flutter/test/material/dropdown_test.dart
+++ b/packages/flutter/test/material/dropdown_test.dart
@@ -115,18 +115,21 @@ void main() {
     }
 
     Widget build() {
-      return new Navigator(
-        initialRoute: '/',
-        onGenerateRoute: (RouteSettings settings) {
-          return new MaterialPageRoute<Null>(
-            settings: settings,
-            builder: (BuildContext context) {
-              return new Material(
-                child: buildFrame(value: 'one', onChanged: didChangeValue),
-              );
-            },
-          );
-        }
+      return new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Navigator(
+          initialRoute: '/',
+          onGenerateRoute: (RouteSettings settings) {
+            return new MaterialPageRoute<Null>(
+              settings: settings,
+              builder: (BuildContext context) {
+                return new Material(
+                  child: buildFrame(value: 'one', onChanged: didChangeValue),
+                );
+              },
+            );
+          },
+        ),
       );
     }
 
diff --git a/packages/flutter/test/rendering/stack_test.dart b/packages/flutter/test/rendering/stack_test.dart
index 516359580e..4ce2e61286 100644
--- a/packages/flutter/test/rendering/stack_test.dart
+++ b/packages/flutter/test/rendering/stack_test.dart
@@ -26,7 +26,10 @@ void main() {
       ),
     );
 
-    final RenderBox stack = new RenderStack(children: <RenderBox>[red, green]);
+    final RenderBox stack = new RenderStack(
+      textDirection: TextDirection.ltr,
+      children: <RenderBox>[red, green],
+    );
     final StackParentData greenParentData = green.parentData;
     greenParentData
       ..top = 0.0
@@ -59,8 +62,9 @@ void main() {
           additionalConstraints: new BoxConstraints.tight(const Size(100.0, 100.0))
       );
       final RenderBox stack = new RenderIndexedStack(
-          children: <RenderBox>[child1, child2, child3],
           index: 1,
+          textDirection: TextDirection.ltr,
+          children: <RenderBox>[child1, child2, child3],
       );
 
       final List<RenderObject> vistedChildren = <RenderObject>[];
diff --git a/packages/flutter/test/widgets/animated_cross_fade_test.dart b/packages/flutter/test/widgets/animated_cross_fade_test.dart
index 7dd78247cb..8c20294c4e 100644
--- a/packages/flutter/test/widgets/animated_cross_fade_test.dart
+++ b/packages/flutter/test/widgets/animated_cross_fade_test.dart
@@ -10,18 +10,21 @@ import 'package:flutter/widgets.dart';
 void main() {
   testWidgets('AnimatedCrossFade test', (WidgetTester tester) async {
     await tester.pumpWidget(
-      const Center(
-        child: const AnimatedCrossFade(
-          firstChild: const SizedBox(
-            width: 100.0,
-            height: 100.0,
+      const Directionality(
+        textDirection: TextDirection.ltr,
+        child: const Center(
+          child: const AnimatedCrossFade(
+            firstChild: const SizedBox(
+              width: 100.0,
+              height: 100.0,
+            ),
+            secondChild: const SizedBox(
+              width: 200.0,
+              height: 200.0,
+            ),
+            duration: const Duration(milliseconds: 200),
+            crossFadeState: CrossFadeState.showFirst,
           ),
-          secondChild: const SizedBox(
-            width: 200.0,
-            height: 200.0,
-          ),
-          duration: const Duration(milliseconds: 200),
-          crossFadeState: CrossFadeState.showFirst,
         ),
       ),
     );
@@ -32,18 +35,21 @@ void main() {
     expect(box.size.height, equals(100.0));
 
     await tester.pumpWidget(
-      const Center(
-        child: const AnimatedCrossFade(
-          firstChild: const SizedBox(
-            width: 100.0,
-            height: 100.0,
+      const Directionality(
+        textDirection: TextDirection.ltr,
+        child: const Center(
+          child: const AnimatedCrossFade(
+            firstChild: const SizedBox(
+              width: 100.0,
+              height: 100.0,
+            ),
+            secondChild: const SizedBox(
+              width: 200.0,
+              height: 200.0,
+            ),
+            duration: const Duration(milliseconds: 200),
+            crossFadeState: CrossFadeState.showSecond,
           ),
-          secondChild: const SizedBox(
-            width: 200.0,
-            height: 200.0,
-          ),
-          duration: const Duration(milliseconds: 200),
-          crossFadeState: CrossFadeState.showSecond,
         ),
       ),
     );
@@ -58,18 +64,21 @@ void main() {
 
   testWidgets('AnimatedCrossFade test showSecond', (WidgetTester tester) async {
     await tester.pumpWidget(
-      const Center(
-        child: const AnimatedCrossFade(
-          firstChild: const SizedBox(
-            width: 100.0,
-            height: 100.0,
+      const Directionality(
+        textDirection: TextDirection.ltr,
+        child: const Center(
+          child: const AnimatedCrossFade(
+            firstChild: const SizedBox(
+              width: 100.0,
+              height: 100.0,
+            ),
+            secondChild: const SizedBox(
+              width: 200.0,
+              height: 200.0,
+            ),
+            duration: const Duration(milliseconds: 200),
+            crossFadeState: CrossFadeState.showSecond,
           ),
-          secondChild: const SizedBox(
-            width: 200.0,
-            height: 200.0,
-          ),
-          duration: const Duration(milliseconds: 200),
-          crossFadeState: CrossFadeState.showSecond,
         ),
       ),
     );
@@ -85,41 +94,47 @@ void main() {
     final Key secondKey = new UniqueKey();
 
     await tester.pumpWidget(
-      new Center(
-        child: new AnimatedCrossFade(
-          alignment: FractionalOffset.bottomRight,
-          firstChild: new SizedBox(
-            key: firstKey,
-            width: 100.0,
-            height: 100.0,
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Center(
+          child: new AnimatedCrossFade(
+            alignment: FractionalOffset.bottomRight,
+            firstChild: new SizedBox(
+              key: firstKey,
+              width: 100.0,
+              height: 100.0,
+            ),
+            secondChild: new SizedBox(
+              key: secondKey,
+              width: 200.0,
+              height: 200.0,
+            ),
+            duration: const Duration(milliseconds: 200),
+            crossFadeState: CrossFadeState.showFirst,
           ),
-          secondChild: new SizedBox(
-            key: secondKey,
-            width: 200.0,
-            height: 200.0,
-          ),
-          duration: const Duration(milliseconds: 200),
-          crossFadeState: CrossFadeState.showFirst,
         ),
       ),
     );
 
     await tester.pumpWidget(
-      new Center(
-        child: new AnimatedCrossFade(
-          alignment: FractionalOffset.bottomRight,
-          firstChild: new SizedBox(
-            key: firstKey,
-            width: 100.0,
-            height: 100.0,
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Center(
+          child: new AnimatedCrossFade(
+            alignment: FractionalOffset.bottomRight,
+            firstChild: new SizedBox(
+              key: firstKey,
+              width: 100.0,
+              height: 100.0,
+            ),
+            secondChild: new SizedBox(
+              key: secondKey,
+              width: 200.0,
+              height: 200.0,
+            ),
+            duration: const Duration(milliseconds: 200),
+            crossFadeState: CrossFadeState.showSecond,
           ),
-          secondChild: new SizedBox(
-            key: secondKey,
-            width: 200.0,
-            height: 200.0,
-          ),
-          duration: const Duration(milliseconds: 200),
-          crossFadeState: CrossFadeState.showSecond,
         ),
       ),
     );
@@ -249,11 +264,14 @@ void main() {
   });
 
   Widget crossFadeWithWatcher({bool towardsSecond: false}) {
-    return new AnimatedCrossFade(
-      firstChild: const _TickerWatchingWidget(),
-      secondChild: new Container(),
-      crossFadeState: towardsSecond ? CrossFadeState.showSecond : CrossFadeState.showFirst,
-      duration: const Duration(milliseconds: 50),
+    return new Directionality(
+      textDirection: TextDirection.ltr,
+      child: new AnimatedCrossFade(
+        firstChild: const _TickerWatchingWidget(),
+        secondChild: new Container(),
+        crossFadeState: towardsSecond ? CrossFadeState.showSecond : CrossFadeState.showFirst,
+        duration: const Duration(milliseconds: 50),
+      ),
     );
   }
 
@@ -301,30 +319,45 @@ void main() {
   });
 
   testWidgets('AnimatedCrossFade.layoutBuilder', (WidgetTester tester) async {
-    await tester.pumpWidget(const AnimatedCrossFade(
-      firstChild: const Text('AAA', textDirection: TextDirection.ltr),
-      secondChild: const Text('BBB', textDirection: TextDirection.ltr),
-      crossFadeState: CrossFadeState.showFirst,
-      duration: const Duration(milliseconds: 50),
-    ));
+    await tester.pumpWidget(
+      const Directionality(
+        textDirection: TextDirection.ltr,
+        child: const AnimatedCrossFade(
+          firstChild: const Text('AAA', textDirection: TextDirection.ltr),
+          secondChild: const Text('BBB', textDirection: TextDirection.ltr),
+          crossFadeState: CrossFadeState.showFirst,
+          duration: const Duration(milliseconds: 50),
+        ),
+      ),
+    );
     expect(find.text('AAA'), findsOneWidget);
     expect(find.text('BBB'), findsOneWidget);
-    await tester.pumpWidget(new AnimatedCrossFade(
-      firstChild: const Text('AAA', textDirection: TextDirection.ltr),
-      secondChild: const Text('BBB', textDirection: TextDirection.ltr),
-      crossFadeState: CrossFadeState.showFirst,
-      duration: const Duration(milliseconds: 50),
-      layoutBuilder: (Widget a, Key aKey, Widget b, Key bKey) => a,
-    ));
+    await tester.pumpWidget(
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new AnimatedCrossFade(
+          firstChild: const Text('AAA', textDirection: TextDirection.ltr),
+          secondChild: const Text('BBB', textDirection: TextDirection.ltr),
+          crossFadeState: CrossFadeState.showFirst,
+          duration: const Duration(milliseconds: 50),
+          layoutBuilder: (Widget a, Key aKey, Widget b, Key bKey) => a,
+        ),
+      ),
+    );
     expect(find.text('AAA'), findsOneWidget);
     expect(find.text('BBB'), findsNothing);
-    await tester.pumpWidget(new AnimatedCrossFade(
-      firstChild: const Text('AAA', textDirection: TextDirection.ltr),
-      secondChild: const Text('BBB', textDirection: TextDirection.ltr),
-      crossFadeState: CrossFadeState.showSecond,
-      duration: const Duration(milliseconds: 50),
-      layoutBuilder: (Widget a, Key aKey, Widget b, Key bKey) => a,
-    ));
+    await tester.pumpWidget(
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new AnimatedCrossFade(
+          firstChild: const Text('AAA', textDirection: TextDirection.ltr),
+          secondChild: const Text('BBB', textDirection: TextDirection.ltr),
+          crossFadeState: CrossFadeState.showSecond,
+          duration: const Duration(milliseconds: 50),
+          layoutBuilder: (Widget a, Key aKey, Widget b, Key bKey) => a,
+        ),
+      ),
+    );
     expect(find.text('BBB'), findsOneWidget);
     expect(find.text('AAA'), findsNothing);
   });
diff --git a/packages/flutter/test/widgets/animated_positioned_test.dart b/packages/flutter/test/widgets/animated_positioned_test.dart
index 61debf3072..70f534cc8c 100644
--- a/packages/flutter/test/widgets/animated_positioned_test.dart
+++ b/packages/flutter/test/widgets/animated_positioned_test.dart
@@ -27,6 +27,7 @@ void main() {
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new AnimatedPositioned(
             child: new Container(key: key),
@@ -50,6 +51,7 @@ void main() {
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new AnimatedPositioned(
             child: new Container(key: key),
@@ -110,6 +112,7 @@ void main() {
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new AnimatedPositioned(
             child: new Container(key: key),
@@ -133,6 +136,7 @@ void main() {
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new AnimatedPositioned(
             child: new Container(key: key),
@@ -156,6 +160,7 @@ void main() {
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new AnimatedPositioned(
             child: new Container(key: key),
@@ -190,6 +195,7 @@ void main() {
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new AnimatedPositioned(
             child: new Container(key: key),
@@ -213,6 +219,7 @@ void main() {
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new AnimatedPositioned(
             child: new Container(key: key),
diff --git a/packages/flutter/test/widgets/app_overrides_test.dart b/packages/flutter/test/widgets/app_overrides_test.dart
index 44d0aac74c..e4ca97889b 100644
--- a/packages/flutter/test/widgets/app_overrides_test.dart
+++ b/packages/flutter/test/widgets/app_overrides_test.dart
@@ -26,12 +26,17 @@ class TestRoute<T> extends PageRoute<T> {
 }
 
 Future<Null> pumpApp(WidgetTester tester) async {
-  await tester.pumpWidget(new WidgetsApp(
-    color: const Color(0xFF333333),
-    onGenerateRoute: (RouteSettings settings) {
-      return new TestRoute<Null>(settings: settings, child: new Container());
-    },
-  ));
+  await tester.pumpWidget(
+    new Directionality(
+      textDirection: TextDirection.ltr,
+      child: new WidgetsApp(
+        color: const Color(0xFF333333),
+        onGenerateRoute: (RouteSettings settings) {
+          return new TestRoute<Null>(settings: settings, child: new Container());
+        },
+      ),
+    ),
+  );
 }
 
 void main() {
diff --git a/packages/flutter/test/widgets/composited_transform_test.dart b/packages/flutter/test/widgets/composited_transform_test.dart
index e293b8c228..89cff1b00a 100644
--- a/packages/flutter/test/widgets/composited_transform_test.dart
+++ b/packages/flutter/test/widgets/composited_transform_test.dart
@@ -11,25 +11,28 @@ void main() {
     final LayerLink link = new LayerLink();
     final GlobalKey key = new GlobalKey();
     await tester.pumpWidget(
-      new Stack(
-        children: <Widget>[
-          new Positioned(
-            left: 123.0,
-            top: 456.0,
-            child: new CompositedTransformTarget(
-              link: link,
-              child: new Container(height: 10.0, width: 10.0),
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Stack(
+          children: <Widget>[
+            new Positioned(
+              left: 123.0,
+              top: 456.0,
+              child: new CompositedTransformTarget(
+                link: link,
+                child: new Container(height: 10.0, width: 10.0),
+              ),
             ),
-          ),
-          new Positioned(
-            left: 787.0,
-            top: 343.0,
-            child: new CompositedTransformFollower(
-              link: link,
-              child: new Container(key: key, height: 10.0, width: 10.0),
+            new Positioned(
+              left: 787.0,
+              top: 343.0,
+              child: new CompositedTransformFollower(
+                link: link,
+                child: new Container(key: key, height: 10.0, width: 10.0),
+              ),
             ),
-          ),
-        ],
+          ],
+        ),
       ),
     );
     final RenderBox box = key.currentContext.findRenderObject();
@@ -41,31 +44,34 @@ void main() {
     final GlobalKey key1 = new GlobalKey();
     final GlobalKey key2 = new GlobalKey();
     await tester.pumpWidget(
-      new Stack(
-        children: <Widget>[
-          new Positioned(
-            top: 123.0,
-            left: 456.0,
-            child: new Transform.rotate(
-              angle: 1.0, // radians
-              child: new CompositedTransformTarget(
-                link: link,
-                child: new Container(key: key1, height: 10.0, width: 10.0),
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Stack(
+          children: <Widget>[
+            new Positioned(
+              top: 123.0,
+              left: 456.0,
+              child: new Transform.rotate(
+                angle: 1.0, // radians
+                child: new CompositedTransformTarget(
+                  link: link,
+                  child: new Container(key: key1, height: 10.0, width: 10.0),
+                ),
               ),
             ),
-          ),
-          new Positioned(
-            top: 787.0,
-            left: 343.0,
-            child: new Transform.rotate(
-              angle: -0.3, // radians
-              child: new CompositedTransformFollower(
-                link: link,
-                child: new Container(key: key2, height: 10.0, width: 10.0),
+            new Positioned(
+              top: 787.0,
+              left: 343.0,
+              child: new Transform.rotate(
+                angle: -0.3, // radians
+                child: new CompositedTransformFollower(
+                  link: link,
+                  child: new Container(key: key2, height: 10.0, width: 10.0),
+                ),
               ),
             ),
-          ),
-        ],
+          ],
+        ),
       ),
     );
     final RenderBox box1 = key1.currentContext.findRenderObject();
@@ -81,43 +87,46 @@ void main() {
     final GlobalKey key1 = new GlobalKey();
     final GlobalKey key2 = new GlobalKey();
     await tester.pumpWidget(
-      new Stack(
-        children: <Widget>[
-          new Positioned(
-            top: 123.0,
-            left: 456.0,
-            child: new Transform.rotate(
-              angle: 1.0, // radians
-              child: new CompositedTransformTarget(
-                link: link,
-                child: new Container(key: key1, height: 10.0, width: 10.0),
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Stack(
+          children: <Widget>[
+            new Positioned(
+              top: 123.0,
+              left: 456.0,
+              child: new Transform.rotate(
+                angle: 1.0, // radians
+                child: new CompositedTransformTarget(
+                  link: link,
+                  child: new Container(key: key1, height: 10.0, width: 10.0),
+                ),
               ),
             ),
-          ),
-          new Positioned(
-            top: 787.0,
-            left: 343.0,
-            child: new Transform.rotate(
-              angle: -0.3, // radians
-              child: new Padding(
-                padding: const EdgeInsets.all(20.0),
-                child: new CompositedTransformFollower(
-                  link: new LayerLink(),
-                  child: new Transform(
-                    transform: new Matrix4.skew(0.9, 1.1),
-                    child: new Padding(
-                      padding: const EdgeInsets.all(20.0),
-                      child: new CompositedTransformFollower(
-                        link: link,
-                        child: new Container(key: key2, height: 10.0, width: 10.0),
+            new Positioned(
+              top: 787.0,
+              left: 343.0,
+              child: new Transform.rotate(
+                angle: -0.3, // radians
+                child: new Padding(
+                  padding: const EdgeInsets.all(20.0),
+                  child: new CompositedTransformFollower(
+                    link: new LayerLink(),
+                    child: new Transform(
+                      transform: new Matrix4.skew(0.9, 1.1),
+                      child: new Padding(
+                        padding: const EdgeInsets.all(20.0),
+                        child: new CompositedTransformFollower(
+                          link: link,
+                          child: new Container(key: key2, height: 10.0, width: 10.0),
+                        ),
                       ),
                     ),
                   ),
                 ),
               ),
             ),
-          ),
-        ],
+          ],
+        ),
       ),
     );
     final RenderBox box1 = key1.currentContext.findRenderObject();
@@ -135,26 +144,29 @@ void main() {
     final GlobalKey key3 = new GlobalKey();
     bool _tapped = false;
     await tester.pumpWidget(
-      new Stack(
-        children: <Widget>[
-          new Positioned(
-            left: 123.0,
-            top: 456.0,
-            child: new CompositedTransformTarget(
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Stack(
+          children: <Widget>[
+            new Positioned(
+              left: 123.0,
+              top: 456.0,
+              child: new CompositedTransformTarget(
+                link: link,
+                child: new Container(key: key1, height: 10.0, width: 10.0),
+              ),
+            ),
+            new CompositedTransformFollower(
               link: link,
-              child: new Container(key: key1, height: 10.0, width: 10.0),
+              child: new GestureDetector(
+                key: key2,
+                behavior: HitTestBehavior.opaque,
+                onTap: () { _tapped = true; },
+                child: new Container(key: key3, height: 10.0, width: 10.0),
+              ),
             ),
-          ),
-          new CompositedTransformFollower(
-            link: link,
-            child: new GestureDetector(
-              key: key2,
-              behavior: HitTestBehavior.opaque,
-              onTap: () { _tapped = true; },
-              child: new Container(key: key3, height: 10.0, width: 10.0),
-            ),
-          ),
-        ],
+          ],
+        ),
       ),
     );
     final RenderBox box2 = key2.currentContext.findRenderObject();
diff --git a/packages/flutter/test/widgets/coordinates_test.dart b/packages/flutter/test/widgets/coordinates_test.dart
index 7f6ac486b4..498c87237c 100644
--- a/packages/flutter/test/widgets/coordinates_test.dart
+++ b/packages/flutter/test/widgets/coordinates_test.dart
@@ -13,6 +13,7 @@ void main() {
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new Positioned(
             top: 100.0,
@@ -20,8 +21,8 @@ void main() {
             child: new SizedBox(
               key: keyA,
               width: 10.0,
-              height: 10.0
-            )
+              height: 10.0,
+            ),
           ),
           new Positioned(
             left: 100.0,
@@ -29,11 +30,11 @@ void main() {
             child: new SizedBox(
               key: keyB,
               width: 20.0,
-              height: 10.0
-            )
+              height: 10.0,
+            ),
           ),
-        ]
-      )
+        ],
+      ),
     );
 
     final RenderBox boxA = tester.renderObject(find.byKey(keyA));
diff --git a/packages/flutter/test/widgets/draggable_test.dart b/packages/flutter/test/widgets/draggable_test.dart
index 4e6acb2666..b521479c64 100644
--- a/packages/flutter/test/widgets/draggable_test.dart
+++ b/packages/flutter/test/widgets/draggable_test.dart
@@ -25,10 +25,10 @@ void main() {
             builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
               return new Container(height: 100.0, child: const Text('Target'));
             },
-            onAccept: accepted.add
+            onAccept: accepted.add,
           ),
-        ]
-      )
+        ],
+      ),
     ));
 
     expect(accepted, isEmpty);
@@ -77,7 +77,7 @@ void main() {
           const Draggable<int>(
             data: 1,
             child: const Text('Source'),
-            feedback: const Text('Dragging')
+            feedback: const Text('Dragging'),
           ),
           new Stack(
             children: <Widget>[
@@ -86,22 +86,22 @@ void main() {
                 onTap: () {
                   events.add('tap');
                 },
-                child: new Container(child: const Text('Button')
-              )
+                child: new Container(child: const Text('Button'),
+              ),
             ),
             new DragTarget<int>(
               builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
                 return new IgnorePointer(
-                  child: new Container(child: const Text('Target'))
+                  child: new Container(child: const Text('Target')),
                 );
               },
               onAccept: (int data) {
                 events.add('drop');
               }),
-            ]
+            ],
           ),
-        ]
-      )
+        ],
+      ),
     ));
 
     expect(events, isEmpty);
@@ -171,9 +171,9 @@ void main() {
               onTap: () {
                 events.add('tap');
               },
-              child: new Container(child: const Text('Button'))
+              child: new Container(child: const Text('Button')),
             ),
-            feedback: const Text('Dragging')
+            feedback: const Text('Dragging'),
           ),
           new DragTarget<int>(
             builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
@@ -181,10 +181,10 @@ void main() {
             },
             onAccept: (int data) {
               events.add('drop');
-            }
+            },
           ),
-        ]
-      )
+        ],
+      ),
     ));
 
     expect(events, isEmpty);
@@ -221,7 +221,7 @@ void main() {
           const LongPressDraggable<int>(
             data: 1,
             child: const Text('Source'),
-            feedback: const Text('Dragging')
+            feedback: const Text('Dragging'),
           ),
           new DragTarget<int>(
             builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
@@ -229,10 +229,10 @@ void main() {
             },
             onAccept: (int data) {
               events.add('drop');
-            }
+            },
           ),
-        ]
-      )
+        ],
+      ),
     ));
 
     expect(events, isEmpty);
@@ -267,7 +267,7 @@ void main() {
           const Draggable<int>(
             data: 1,
             child: const Text('Source'),
-            feedback: const Text('Dragging')
+            feedback: const Text('Dragging'),
           ),
           new DragTarget<int>(
             builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
@@ -275,10 +275,10 @@ void main() {
             },
             onAccept: (int data) {
               events.add('drop');
-            }
+            },
           ),
-        ]
-      )
+        ],
+      ),
     ));
 
     expect(events, isEmpty);
@@ -337,8 +337,8 @@ void main() {
           new Container(height: 500.0),
           new Container(height: 500.0),
           new Container(height: 500.0),
-        ]
-      )
+        ],
+      ),
     ));
 
     expect(events, isEmpty);
@@ -444,8 +444,8 @@ void main() {
           new Container(width: 500.0),
           new Container(width: 500.0),
           new Container(width: 500.0),
-        ]
-      )
+        ],
+      ),
     ));
 
     expect(events, isEmpty);
@@ -537,10 +537,10 @@ void main() {
             builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
               return new Container(height: 100.0, child: const Text('Target'));
             },
-            onAccept: accepted.add
+            onAccept: accepted.add,
           ),
-        ]
-      )
+        ],
+      ),
     ));
 
     expect(accepted, isEmpty);
@@ -596,7 +596,7 @@ void main() {
               onDraggableCanceledCalled = true;
               onDraggableCanceledVelocity = velocity;
               onDraggableCanceledOffset = offset;
-            }
+            },
           ),
           new DragTarget<int>(
             builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
@@ -605,10 +605,10 @@ void main() {
                 child: const Text('Target')
               );
             },
-            onWillAccept: (int data) => false
+            onWillAccept: (int data) => false,
           ),
-        ]
-      )
+        ],
+      ),
     ));
 
     expect(accepted, isEmpty);
@@ -665,18 +665,18 @@ void main() {
             onDraggableCanceledCalled = true;
             onDraggableCanceledVelocity = velocity;
             onDraggableCanceledOffset = offset;
-          }
+          },
         ),
         new DragTarget<int>(
           builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
             return new Container(
               height: 100.0,
-              child: const Text('Target')
+              child: const Text('Target'),
             );
           },
           onWillAccept: (int data) => false),
-        ]
-      )
+        ],
+      ),
     ));
 
     expect(accepted, isEmpty);
@@ -712,19 +712,19 @@ void main() {
             feedback: const Text('Dragging'),
             onDragCompleted: () {
               onDragCompletedCalled = true;
-            }
+            },
           ),
           new DragTarget<int>(
             builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
               return new Container(
                 height: 100.0,
-                child: const Text('Target')
+                child: const Text('Target'),
               );
             },
-            onWillAccept: (int data) => false
+            onWillAccept: (int data) => false,
           ),
-        ]
-      )
+        ],
+      ),
     ));
 
     expect(accepted, isEmpty);
@@ -776,16 +776,16 @@ void main() {
             feedback: const Text('Dragging'),
             onDragCompleted: () {
               onDragCompletedCalled = true;
-            }
+            },
           ),
           new DragTarget<int>(
             builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
               return new Container(height: 100.0, child: const Text('Target'));
             },
-            onAccept: accepted.add
+            onAccept: accepted.add,
           ),
-        ]
-      )
+        ],
+      ),
     ));
 
     expect(accepted, isEmpty);
@@ -834,12 +834,12 @@ void main() {
           const Draggable<int>(
             data: 1,
             child: const Text('IntSource'),
-            feedback: const Text('IntDragging')
+            feedback: const Text('IntDragging'),
           ),
           const Draggable<double>(
             data: 1.0,
             child: const Text('DoubleSource'),
-            feedback: const Text('DoubleDragging')
+            feedback: const Text('DoubleDragging'),
           ),
           new Stack(
             children: <Widget>[
@@ -848,27 +848,27 @@ void main() {
                   return new IgnorePointer(
                     child: new Container(
                       height: 100.0,
-                      child: const Text('Target1')
-                    )
+                      child: const Text('Target1'),
+                    ),
                   );
                 },
-                onAccept: acceptedInts.add
+                onAccept: acceptedInts.add,
               ),
               new DragTarget<double>(
                 builder: (BuildContext context, List<double> data, List<dynamic> rejects) {
                   return new IgnorePointer(
                     child: new Container(
                       height: 100.0,
-                      child: const Text('Target2')
-                    )
+                      child: const Text('Target2'),
+                    ),
                   );
                 },
-                onAccept: acceptedDoubles.add
+                onAccept: acceptedDoubles.add,
               ),
-            ]
-          )
-        ]
-      )
+            ],
+          ),
+        ],
+      ),
     ));
 
     expect(acceptedInts, isEmpty);
@@ -947,7 +947,7 @@ void main() {
           new Draggable<DragTargetData>(
             data: dragTargetData,
             child: const Text('Source'),
-            feedback: const Text('Dragging')
+            feedback: const Text('Dragging'),
           ),
           new Stack(
             children: <Widget>[
@@ -956,26 +956,26 @@ void main() {
                   return new IgnorePointer(
                     child: new Container(
                       height: 100.0,
-                      child: const Text('Target1')
-                    )
+                      child: const Text('Target1'),
+                    ),
                   );
-                }, onAccept: acceptedDragTargetDatas.add
+                }, onAccept: acceptedDragTargetDatas.add,
               ),
               new DragTarget<ExtendedDragTargetData>(
                 builder: (BuildContext context, List<ExtendedDragTargetData> data, List<dynamic> rejects) {
                   return new IgnorePointer(
                     child: new Container(
                       height: 100.0,
-                      child: const Text('Target2')
-                    )
+                      child: const Text('Target2'),
+                    ),
                   );
                 },
-                onAccept: acceptedExtendedDragTargetDatas.add
+                onAccept: acceptedExtendedDragTargetDatas.add,
               ),
-            ]
-          )
-        ]
-      )
+            ],
+          ),
+        ],
+      ),
     ));
 
     final Offset dragTargetLocation = tester.getCenter(find.text('Source'));
@@ -1008,16 +1008,16 @@ void main() {
               data: 1,
               maxSimultaneousDrags: maxSimultaneousDrags,
               child: const Text('Source'),
-              feedback: const Text('Dragging')
+              feedback: const Text('Dragging'),
             ),
             new DragTarget<int>(
               builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
                 return new Container(height: 100.0, child: const Text('Target'));
               },
-              onAccept: accepted.add
+              onAccept: accepted.add,
             ),
-          ]
-        )
+          ],
+        ),
       );
     }
 
@@ -1109,27 +1109,32 @@ void main() {
 
   testWidgets('Draggable disposes recognizer', (WidgetTester tester) async {
     bool didTap = false;
-    await tester.pumpWidget(new Overlay(
-      initialEntries: <OverlayEntry>[
-        new OverlayEntry(
-          builder: (BuildContext context) => new GestureDetector(
-            onTap: () {
-              didTap = true;
-            },
-            child: new Draggable<dynamic>(
-              child: new Container(
-                color: const Color(0xFFFFFF00),
+    await tester.pumpWidget(
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Overlay(
+          initialEntries: <OverlayEntry>[
+            new OverlayEntry(
+              builder: (BuildContext context) => new GestureDetector(
+                onTap: () {
+                  didTap = true;
+                },
+                child: new Draggable<dynamic>(
+                  child: new Container(
+                    color: const Color(0xFFFFFF00),
+                  ),
+                  feedback: new Container(
+                    width: 100.0,
+                    height: 100.0,
+                    color: const Color(0xFFFF0000),
+                  ),
+                ),
               ),
-              feedback: new Container(
-                width: 100.0,
-                height: 100.0,
-                color: const Color(0xFFFF0000),
-              )
-            )
-          )
-        )
-      ]
-    ));
+            ),
+          ],
+        ),
+      ),
+    );
 
     await tester.startGesture(const Offset(10.0, 10.0));
     expect(didTap, isFalse);
@@ -1142,25 +1147,30 @@ void main() {
 
   // Regression test for https://github.com/flutter/flutter/issues/6128.
   testWidgets('Draggable plays nice with onTap', (WidgetTester tester) async {
-    await tester.pumpWidget(new Overlay(
-      initialEntries: <OverlayEntry>[
-        new OverlayEntry(
-          builder: (BuildContext context) => new GestureDetector(
-            onTap: () { /* registers a tap recognizer */ },
-            child: new Draggable<dynamic>(
-              child: new Container(
-                color: const Color(0xFFFFFF00),
+    await tester.pumpWidget(
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Overlay(
+          initialEntries: <OverlayEntry>[
+            new OverlayEntry(
+              builder: (BuildContext context) => new GestureDetector(
+                onTap: () { /* registers a tap recognizer */ },
+                child: new Draggable<dynamic>(
+                  child: new Container(
+                    color: const Color(0xFFFFFF00),
+                  ),
+                  feedback: new Container(
+                    width: 100.0,
+                    height: 100.0,
+                    color: const Color(0xFFFF0000),
+                  ),
+                ),
               ),
-              feedback: new Container(
-                width: 100.0,
-                height: 100.0,
-                color: const Color(0xFFFF0000),
-              )
-            )
-          )
-        )
-      ]
-    ));
+            ),
+          ],
+        ),
+      ),
+    );
 
     final TestGesture firstGesture = await tester.startGesture(const Offset(10.0, 10.0), pointer: 24);
     final TestGesture secondGesture = await tester.startGesture(const Offset(10.0, 20.0), pointer: 25);
@@ -1187,10 +1197,10 @@ void main() {
             },
             onAccept: (int data) {
               events.add('drop');
-            }
+            },
           ),
-        ]
-      )
+        ],
+      ),
     ));
 
     expect(events, isEmpty);
@@ -1232,21 +1242,21 @@ void main() {
     final List<int> accepted = <int>[];
 
     await tester.pumpWidget(new MaterialApp(
-        home: new Column(
-            children: <Widget>[
-              const Draggable<int>(
-                  data: 1,
-                  child: const Text('Source'),
-                  feedback: const Text('Dragging')
-              ),
-              new DragTarget<int>(
-                  builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
-                    return new Container(height: 100.0, child: const Text('Target'));
-                  },
-                  onAccept: accepted.add
-              ),
-            ]
-        )
+      home: new Column(
+        children: <Widget>[
+          const Draggable<int>(
+            data: 1,
+            child: const Text('Source'),
+            feedback: const Text('Dragging')
+          ),
+          new DragTarget<int>(
+            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
+              return new Container(height: 100.0, child: const Text('Target'));
+            },
+            onAccept: accepted.add,
+          ),
+        ],
+      ),
     ));
 
     expect(accepted, isEmpty);
@@ -1264,16 +1274,16 @@ void main() {
     expect(find.text('Target'), findsOneWidget);
 
     await tester.pumpWidget(new MaterialApp(
-        home: new Column(
-            children: <Widget>[
-              new DragTarget<int>(
-                  builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
-                    return new Container(height: 100.0, child: const Text('Target'));
-                  },
-                  onAccept: accepted.add
-              ),
-            ]
-        )
+      home: new Column(
+        children: <Widget>[
+          new DragTarget<int>(
+            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
+              return new Container(height: 100.0, child: const Text('Target'));
+            },
+            onAccept: accepted.add,
+          ),
+        ],
+      ),
     ));
 
     expect(accepted, isEmpty);
@@ -1336,34 +1346,39 @@ Future<Null> _testChildAnchorFeedbackPosition({WidgetTester tester, double top:
   final List<int> accepted = <int>[];
   int dragStartedCount = 0;
 
-  await tester.pumpWidget(new Stack(children: <Widget>[
-    new Positioned(
-      left: left,
-      top: top,
-      right: 0.0,
-      bottom: 0.0,
-      child: new MaterialApp(
-        home: new Column(
-          children: <Widget>[
-            new Draggable<int>(
-              data: 1,
-              child: const Text('Source'),
-              feedback: const Text('Dragging'),
-              onDragStarted: () {
-                ++dragStartedCount;
-              },
+  await tester.pumpWidget(
+    new Stack(
+      textDirection: TextDirection.ltr,
+      children: <Widget>[
+        new Positioned(
+          left: left,
+          top: top,
+          right: 0.0,
+          bottom: 0.0,
+          child: new MaterialApp(
+            home: new Column(
+              children: <Widget>[
+                new Draggable<int>(
+                  data: 1,
+                  child: const Text('Source'),
+                  feedback: const Text('Dragging'),
+                  onDragStarted: () {
+                    ++dragStartedCount;
+                  },
+                ),
+                new DragTarget<int>(
+                  builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
+                    return new Container(height: 100.0, child: const Text('Target'));
+                  },
+                  onAccept: accepted.add,
+                ),
+              ],
             ),
-            new DragTarget<int>(
-              builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
-                return new Container(height: 100.0, child: const Text('Target'));
-              },
-              onAccept: accepted.add
-            ),
-          ]
-        )
-      )
-    )
-  ]));
+          ),
+        ),
+      ],
+    ),
+  );
 
   expect(accepted, isEmpty);
   expect(find.text('Source'), findsOneWidget);
diff --git a/packages/flutter/test/widgets/flex_test.dart b/packages/flutter/test/widgets/flex_test.dart
index f93df040c5..7e2feeca08 100644
--- a/packages/flutter/test/widgets/flex_test.dart
+++ b/packages/flutter/test/widgets/flex_test.dart
@@ -10,32 +10,35 @@ void main() {
   testWidgets('Can hit test flex children of stacks', (WidgetTester tester) async {
     bool didReceiveTap = false;
     await tester.pumpWidget(
-      new Container(
-        color: const Color(0xFF00FF00),
-        child: new Stack(
-          children: <Widget>[
-            new Positioned(
-              top: 10.0,
-              left: 10.0,
-              child: new Column(
-                children: <Widget>[
-                  new GestureDetector(
-                    onTap: () {
-                      didReceiveTap = true;
-                    },
-                    child: new Container(
-                      color: const Color(0xFF0000FF),
-                      width: 100.0,
-                      height: 100.0,
-                      child: const Center(
-                        child: const Text('X', textDirection: TextDirection.ltr),
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Container(
+          color: const Color(0xFF00FF00),
+          child: new Stack(
+            children: <Widget>[
+              new Positioned(
+                top: 10.0,
+                left: 10.0,
+                child: new Column(
+                  children: <Widget>[
+                    new GestureDetector(
+                      onTap: () {
+                        didReceiveTap = true;
+                      },
+                      child: new Container(
+                        color: const Color(0xFF0000FF),
+                        width: 100.0,
+                        height: 100.0,
+                        child: const Center(
+                          child: const Text('X', textDirection: TextDirection.ltr),
+                        ),
                       ),
                     ),
-                  ),
-                ],
+                  ],
+                ),
               ),
-            ),
-          ],
+            ],
+          ),
         ),
       ),
     );
diff --git a/packages/flutter/test/widgets/framework_test.dart b/packages/flutter/test/widgets/framework_test.dart
index 76ccd94b87..e464d2f502 100644
--- a/packages/flutter/test/widgets/framework_test.dart
+++ b/packages/flutter/test/widgets/framework_test.dart
@@ -47,6 +47,7 @@ void main() {
   testWidgets('GlobalKey duplication 1 - double appearance', (WidgetTester tester) async {
     final Key key = new GlobalKey(debugLabel: 'problematic');
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(
           key: const ValueKey<int>(1),
@@ -65,6 +66,7 @@ void main() {
     final Key key = new GlobalKey(debugLabel: 'problematic');
 
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(
           key: const ValueKey<int>(1),
@@ -79,6 +81,7 @@ void main() {
     ));
 
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(
           key: const ValueKey<int>(1),
@@ -97,11 +100,13 @@ void main() {
   testWidgets('GlobalKey duplication 3 - splitting and changing type', (WidgetTester tester) async {
     final Key key = new GlobalKey(debugLabel: 'problematic');
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(key: key),
       ],
     ));
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new SizedBox(key: key),
         new Placeholder(key: key),
@@ -113,11 +118,13 @@ void main() {
   testWidgets('GlobalKey duplication 4 - splitting and half changing type', (WidgetTester tester) async {
     final Key key = new GlobalKey(debugLabel: 'problematic');
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(key: key),
       ],
     ));
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(key: key),
         new Placeholder(key: key),
@@ -129,11 +136,13 @@ void main() {
   testWidgets('GlobalKey duplication 5 - splitting and half changing type', (WidgetTester tester) async {
     final Key key = new GlobalKey(debugLabel: 'problematic');
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(key: key),
       ],
     ));
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Placeholder(key: key),
         new Container(key: key),
@@ -145,11 +154,13 @@ void main() {
   testWidgets('GlobalKey duplication 6 - splitting and not changing type', (WidgetTester tester) async {
     final Key key = new GlobalKey(debugLabel: 'problematic');
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(key: key),
       ],
     ));
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(key: key),
         new Container(key: key),
@@ -161,12 +172,14 @@ void main() {
   testWidgets('GlobalKey duplication 7 - appearing later', (WidgetTester tester) async {
     final Key key = new GlobalKey(debugLabel: 'problematic');
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(key: const ValueKey<int>(1), child: new Container(key: key)),
         new Container(key: const ValueKey<int>(2)),
       ],
     ));
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(key: const ValueKey<int>(1), child: new Container(key: key)),
         new Container(key: const ValueKey<int>(2), child: new Container(key: key)),
@@ -178,12 +191,14 @@ void main() {
   testWidgets('GlobalKey duplication 8 - appearing earlier', (WidgetTester tester) async {
     final Key key = new GlobalKey(debugLabel: 'problematic');
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(key: const ValueKey<int>(1)),
         new Container(key: const ValueKey<int>(2), child: new Container(key: key)),
       ],
     ));
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(key: const ValueKey<int>(1), child: new Container(key: key)),
         new Container(key: const ValueKey<int>(2), child: new Container(key: key)),
@@ -195,6 +210,7 @@ void main() {
   testWidgets('GlobalKey duplication 9 - moving and appearing later', (WidgetTester tester) async {
     final Key key = new GlobalKey(debugLabel: 'problematic');
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(key: const ValueKey<int>(0), child: new Container(key: key)),
         new Container(key: const ValueKey<int>(1)),
@@ -202,6 +218,7 @@ void main() {
       ],
     ));
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(key: const ValueKey<int>(0)),
         new Container(key: const ValueKey<int>(1), child: new Container(key: key)),
@@ -214,6 +231,7 @@ void main() {
   testWidgets('GlobalKey duplication 10 - moving and appearing earlier', (WidgetTester tester) async {
     final Key key = new GlobalKey(debugLabel: 'problematic');
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(key: const ValueKey<int>(1)),
         new Container(key: const ValueKey<int>(2)),
@@ -221,6 +239,7 @@ void main() {
       ],
     ));
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(key: const ValueKey<int>(1), child: new Container(key: key)),
         new Container(key: const ValueKey<int>(2), child: new Container(key: key)),
@@ -233,6 +252,7 @@ void main() {
   testWidgets('GlobalKey duplication 11 - double sibling appearance', (WidgetTester tester) async {
     final Key key = new GlobalKey(debugLabel: 'problematic');
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(key: key),
         new Container(key: key),
@@ -246,6 +266,7 @@ void main() {
     final Key key2 = new GlobalKey(debugLabel: 'problematic'); // intentionally the same label
     final Key key3 = new GlobalKey(debugLabel: 'also problematic');
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(key: key1),
         new Container(key: key1),
@@ -284,6 +305,7 @@ void main() {
     final Key key2 = new GlobalKey(debugLabel: 'problematic'); // intentionally the same label
     final Key key3 = new GlobalKey(debugLabel: 'also problematic');
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(key: key1),
         new Container(key: key2),
@@ -291,6 +313,7 @@ void main() {
       ]),
     );
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(key: key1),
         new Container(key: key1),
@@ -327,6 +350,7 @@ void main() {
   testWidgets('GlobalKey duplication 14 - moving during build - before', (WidgetTester tester) async {
     final Key key = new GlobalKey(debugLabel: 'problematic');
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(key: key),
         new Container(key: const ValueKey<int>(0)),
@@ -334,6 +358,7 @@ void main() {
       ],
     ));
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(key: const ValueKey<int>(0)),
         new Container(key: const ValueKey<int>(1), child: new Container(key: key)),
@@ -344,6 +369,7 @@ void main() {
   testWidgets('GlobalKey duplication 15 - duplicating during build - before', (WidgetTester tester) async {
     final Key key = new GlobalKey(debugLabel: 'problematic');
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(key: key),
         new Container(key: const ValueKey<int>(0)),
@@ -351,6 +377,7 @@ void main() {
       ],
     ));
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(key: key),
         new Container(key: const ValueKey<int>(0)),
@@ -363,6 +390,7 @@ void main() {
   testWidgets('GlobalKey duplication 16 - moving during build - after', (WidgetTester tester) async {
     final Key key = new GlobalKey(debugLabel: 'problematic');
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(key: const ValueKey<int>(0)),
         new Container(key: const ValueKey<int>(1)),
@@ -370,6 +398,7 @@ void main() {
       ],
     ));
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(key: const ValueKey<int>(0)),
         new Container(key: const ValueKey<int>(1), child: new Container(key: key)),
@@ -380,6 +409,7 @@ void main() {
   testWidgets('GlobalKey duplication 17 - duplicating during build - after', (WidgetTester tester) async {
     final Key key = new GlobalKey(debugLabel: 'problematic');
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(key: const ValueKey<int>(0)),
         new Container(key: const ValueKey<int>(1)),
@@ -393,6 +423,7 @@ void main() {
       count += 1;
     };
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(key: const ValueKey<int>(0)),
         new Container(key: const ValueKey<int>(1), child: new Container(key: key)),
diff --git a/packages/flutter/test/widgets/gesture_detector_test.dart b/packages/flutter/test/widgets/gesture_detector_test.dart
index 9c94af5bba..f4644c8771 100644
--- a/packages/flutter/test/widgets/gesture_detector_test.dart
+++ b/packages/flutter/test/widgets/gesture_detector_test.dart
@@ -25,7 +25,7 @@ void main() {
       },
       child: new Container(
         color: const Color(0xFF00FF00),
-      )
+      ),
     );
 
     await tester.pumpWidget(widget);
@@ -70,7 +70,7 @@ void main() {
       onHorizontalDragEnd: (DragEndDetails details) { fail('gesture should not match'); },
       child: new Container(
         color: const Color(0xFF00FF00),
-      )
+      ),
     );
     await tester.pumpWidget(widget);
 
@@ -106,8 +106,8 @@ void main() {
         },
         child: new Container(
           color: const Color(0xFF00FF00),
-        )
-      )
+        ),
+      ),
     );
 
     expect(didStartPan, isFalse);
@@ -128,30 +128,33 @@ void main() {
 
     Future<Null> pumpWidgetTree(HitTestBehavior behavior) {
       return tester.pumpWidget(
-        new Stack(
-          children: <Widget>[
-            new Listener(
-              onPointerDown: (_) {
-                didReceivePointerDown = true;
-              },
-              child: new Container(
+        new Directionality(
+          textDirection: TextDirection.ltr,
+          child: new Stack(
+            children: <Widget>[
+              new Listener(
+                onPointerDown: (_) {
+                  didReceivePointerDown = true;
+                },
+                child: new Container(
+                  width: 100.0,
+                  height: 100.0,
+                  color: const Color(0xFF00FF00),
+                ),
+              ),
+              new Container(
                 width: 100.0,
                 height: 100.0,
-                color: const Color(0xFF00FF00),
-              )
-            ),
-            new Container(
-              width: 100.0,
-              height: 100.0,
-              child: new GestureDetector(
-                onTap: () {
-                  didTap = true;
-                },
-                behavior: behavior
-              )
-            )
-          ]
-        )
+                child: new GestureDetector(
+                  onTap: () {
+                    didTap = true;
+                  },
+                  behavior: behavior,
+                ),
+              ),
+            ],
+          ),
+        ),
       );
     }
 
@@ -193,8 +196,8 @@ void main() {
           onTap: () {
             didTap = true;
           },
-        )
-      )
+        ),
+      ),
     );
     expect(didTap, isFalse);
     await tester.tapAt(const Offset(10.0, 10.0));
@@ -210,8 +213,8 @@ void main() {
             didTap = true;
           },
           child: new Container(),
-        )
-      )
+        ),
+      ),
     );
     expect(didTap, isFalse);
     await tester.tapAt(const Offset(10.0, 10.0));
@@ -222,24 +225,24 @@ void main() {
     final GestureTapCallback inputCallback = () {};
 
     await tester.pumpWidget(
-        new Center(
-            child: new GestureDetector(
-              onTap: inputCallback,
-              child: new Container(),
-            )
-        )
+      new Center(
+        child: new GestureDetector(
+          onTap: inputCallback,
+          child: new Container(),
+        ),
+      ),
     );
 
     final RenderSemanticsGestureHandler renderObj1 = tester.renderObject(find.byType(GestureDetector));
     final GestureTapCallback actualCallback1 = renderObj1.onTap;
 
     await tester.pumpWidget(
-        new Center(
-            child: new GestureDetector(
-              onTap: inputCallback,
-              child: new Container(),
-            )
-        )
+      new Center(
+        child: new GestureDetector(
+          onTap: inputCallback,
+          child: new Container(),
+        ),
+      ),
     );
 
     final RenderSemanticsGestureHandler renderObj2 = tester.renderObject(find.byType(GestureDetector));
diff --git a/packages/flutter/test/widgets/modal_barrier_test.dart b/packages/flutter/test/widgets/modal_barrier_test.dart
index b2d628fcb9..c58702fc89 100644
--- a/packages/flutter/test/widgets/modal_barrier_test.dart
+++ b/packages/flutter/test/widgets/modal_barrier_test.dart
@@ -30,6 +30,7 @@ void main() {
 
   testWidgets('ModalBarrier prevents interactions with widgets behind it', (WidgetTester tester) async {
     final Widget subject = new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         tapTarget,
         const ModalBarrier(dismissible: false),
@@ -45,6 +46,7 @@ void main() {
 
   testWidgets('ModalBarrier does not prevent interactions with widgets in front of it', (WidgetTester tester) async {
     final Widget subject = new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         const ModalBarrier(dismissible: false),
         tapTarget,
diff --git a/packages/flutter/test/widgets/multichild_test.dart b/packages/flutter/test/widgets/multichild_test.dart
index a9a60ebd61..343398b559 100644
--- a/packages/flutter/test/widgets/multichild_test.dart
+++ b/packages/flutter/test/widgets/multichild_test.dart
@@ -36,75 +36,81 @@ void main() {
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new DecoratedBox(decoration: kBoxDecorationA),
           new DecoratedBox(decoration: kBoxDecorationB),
           new DecoratedBox(decoration: kBoxDecorationC),
-        ]
-      )
+        ],
+      ),
     );
 
     checkTree(tester, <BoxDecoration>[kBoxDecorationA, kBoxDecorationB, kBoxDecorationC]);
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new DecoratedBox(decoration: kBoxDecorationA),
           new DecoratedBox(decoration: kBoxDecorationC),
-        ]
-      )
+        ],
+      ),
     );
 
     checkTree(tester, <BoxDecoration>[kBoxDecorationA, kBoxDecorationC]);
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new DecoratedBox(decoration: kBoxDecorationA),
           new DecoratedBox(key: const Key('b'), decoration: kBoxDecorationB),
           new DecoratedBox(decoration: kBoxDecorationC),
-        ]
-      )
+        ],
+      ),
     );
 
     checkTree(tester, <BoxDecoration>[kBoxDecorationA, kBoxDecorationB, kBoxDecorationC]);
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new DecoratedBox(key: const Key('b'), decoration: kBoxDecorationB),
           new DecoratedBox(decoration: kBoxDecorationC),
           new DecoratedBox(key: const Key('a'), decoration: kBoxDecorationA),
-        ]
-      )
+        ],
+      ),
     );
 
     checkTree(tester, <BoxDecoration>[kBoxDecorationB, kBoxDecorationC, kBoxDecorationA]);
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new DecoratedBox(key: const Key('a'), decoration: kBoxDecorationA),
           new DecoratedBox(decoration: kBoxDecorationC),
           new DecoratedBox(key: const Key('b'), decoration: kBoxDecorationB),
-        ]
-      )
+        ],
+      ),
     );
 
     checkTree(tester, <BoxDecoration>[kBoxDecorationA, kBoxDecorationC, kBoxDecorationB]);
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new DecoratedBox(decoration: kBoxDecorationC),
-        ]
-      )
+        ],
+      ),
     );
 
     checkTree(tester, <BoxDecoration>[kBoxDecorationC]);
 
     await tester.pumpWidget(
-      new Stack()
+      new Stack(textDirection: TextDirection.ltr)
     );
 
     checkTree(tester, <BoxDecoration>[]);
@@ -115,116 +121,123 @@ void main() {
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new DecoratedBox(decoration: kBoxDecorationA),
           new DecoratedBox(decoration: kBoxDecorationB),
           new DecoratedBox(decoration: kBoxDecorationC),
-        ]
-      )
+        ],
+      ),
     );
 
     checkTree(tester, <BoxDecoration>[kBoxDecorationA, kBoxDecorationB, kBoxDecorationC]);
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new DecoratedBox(decoration: kBoxDecorationA),
           new Container(
             child: new DecoratedBox(decoration: kBoxDecorationB)
           ),
           new DecoratedBox(decoration: kBoxDecorationC),
-        ]
-      )
+        ],
+      ),
     );
 
     checkTree(tester, <BoxDecoration>[kBoxDecorationA, kBoxDecorationB, kBoxDecorationC]);
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new DecoratedBox(decoration: kBoxDecorationA),
           new Container(
             child: new Container(
-              child: new DecoratedBox(decoration: kBoxDecorationB)
-            )
+              child: new DecoratedBox(decoration: kBoxDecorationB),
+            ),
           ),
           new DecoratedBox(decoration: kBoxDecorationC),
-        ]
-      )
+        ],
+      ),
     );
 
     checkTree(tester, <BoxDecoration>[kBoxDecorationA, kBoxDecorationB, kBoxDecorationC]);
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new Container(
             child: new Container(
-              child: new DecoratedBox(decoration: kBoxDecorationB)
-            )
+              child: new DecoratedBox(decoration: kBoxDecorationB),
+            ),
           ),
           new Container(
-            child: new DecoratedBox(decoration: kBoxDecorationA)
+            child: new DecoratedBox(decoration: kBoxDecorationA),
           ),
           new DecoratedBox(decoration: kBoxDecorationC),
-        ]
-      )
+        ],
+      ),
     );
 
     checkTree(tester, <BoxDecoration>[kBoxDecorationB, kBoxDecorationA, kBoxDecorationC]);
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new Container(
-            child: new DecoratedBox(decoration: kBoxDecorationB)
+            child: new DecoratedBox(decoration: kBoxDecorationB),
           ),
           new Container(
-            child: new DecoratedBox(decoration: kBoxDecorationA)
+            child: new DecoratedBox(decoration: kBoxDecorationA),
           ),
           new DecoratedBox(decoration: kBoxDecorationC),
-        ]
-      )
+        ],
+      ),
     );
 
     checkTree(tester, <BoxDecoration>[kBoxDecorationB, kBoxDecorationA, kBoxDecorationC]);
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new Container(
             key: const Key('b'),
-            child: new DecoratedBox(decoration: kBoxDecorationB)
+            child: new DecoratedBox(decoration: kBoxDecorationB),
           ),
           new Container(
             key: const Key('a'),
-            child: new DecoratedBox(decoration: kBoxDecorationA)
+            child: new DecoratedBox(decoration: kBoxDecorationA),
           ),
-        ]
-      )
+        ],
+      ),
     );
 
     checkTree(tester, <BoxDecoration>[kBoxDecorationB, kBoxDecorationA]);
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new Container(
             key: const Key('a'),
-            child: new DecoratedBox(decoration: kBoxDecorationA)
+            child: new DecoratedBox(decoration: kBoxDecorationA),
           ),
           new Container(
             key: const Key('b'),
-            child: new DecoratedBox(decoration: kBoxDecorationB)
+            child: new DecoratedBox(decoration: kBoxDecorationB),
           ),
-        ]
-      )
+        ],
+      ),
     );
 
     checkTree(tester, <BoxDecoration>[kBoxDecorationA, kBoxDecorationB]);
 
     await tester.pumpWidget(
-      new Stack()
+      new Stack(textDirection: TextDirection.ltr)
     );
 
     checkTree(tester, <BoxDecoration>[]);
@@ -233,25 +246,27 @@ void main() {
   testWidgets('MultiChildRenderObjectElement with stateful widgets', (WidgetTester tester) async {
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new DecoratedBox(decoration: kBoxDecorationA),
           new DecoratedBox(decoration: kBoxDecorationB),
-        ]
-      )
+        ],
+      ),
     );
 
     checkTree(tester, <BoxDecoration>[kBoxDecorationA, kBoxDecorationB]);
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new FlipWidget(
             left: new DecoratedBox(decoration: kBoxDecorationA),
-            right: new DecoratedBox(decoration: kBoxDecorationB)
+            right: new DecoratedBox(decoration: kBoxDecorationB),
           ),
           new DecoratedBox(decoration: kBoxDecorationC),
-        ]
-      )
+        ],
+      ),
     );
 
     checkTree(tester, <BoxDecoration>[kBoxDecorationA, kBoxDecorationC]);
@@ -263,13 +278,14 @@ void main() {
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new FlipWidget(
             left: new DecoratedBox(decoration: kBoxDecorationA),
-            right: new DecoratedBox(decoration: kBoxDecorationB)
+            right: new DecoratedBox(decoration: kBoxDecorationB),
           ),
-        ]
-      )
+        ],
+      ),
     );
 
     checkTree(tester, <BoxDecoration>[kBoxDecorationB]);
@@ -281,27 +297,29 @@ void main() {
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new FlipWidget(
             key: const Key('flip'),
             left: new DecoratedBox(decoration: kBoxDecorationA),
-            right: new DecoratedBox(decoration: kBoxDecorationB)
+            right: new DecoratedBox(decoration: kBoxDecorationB),
           ),
-        ]
-      )
+        ],
+      ),
     );
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new DecoratedBox(key: const Key('c'), decoration: kBoxDecorationC),
           new FlipWidget(
             key: const Key('flip'),
             left: new DecoratedBox(decoration: kBoxDecorationA),
-            right: new DecoratedBox(decoration: kBoxDecorationB)
+            right: new DecoratedBox(decoration: kBoxDecorationB),
           ),
-        ]
-      )
+        ],
+      ),
     );
 
     checkTree(tester, <BoxDecoration>[kBoxDecorationC, kBoxDecorationA]);
@@ -313,15 +331,16 @@ void main() {
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new FlipWidget(
             key: const Key('flip'),
             left: new DecoratedBox(decoration: kBoxDecorationA),
-            right: new DecoratedBox(decoration: kBoxDecorationB)
+            right: new DecoratedBox(decoration: kBoxDecorationB),
           ),
           new DecoratedBox(key: const Key('c'), decoration: kBoxDecorationC),
-        ]
-      )
+        ],
+      ),
     );
 
     checkTree(tester, <BoxDecoration>[kBoxDecorationB, kBoxDecorationC]);
diff --git a/packages/flutter/test/widgets/overlay_test.dart b/packages/flutter/test/widgets/overlay_test.dart
index f7619beb7a..c7e701320b 100644
--- a/packages/flutter/test/widgets/overlay_test.dart
+++ b/packages/flutter/test/widgets/overlay_test.dart
@@ -10,20 +10,25 @@ void main() {
       (WidgetTester tester) async {
     final GlobalKey overlayKey = new GlobalKey();
     bool didBuild = false;
-    await tester.pumpWidget(new Overlay(
-      key: overlayKey,
-      initialEntries: <OverlayEntry>[
-        new OverlayEntry(
-          builder: (BuildContext context) {
-            didBuild = true;
-            final Overlay overlay = context.ancestorWidgetOfExactType(Overlay);
-            expect(overlay, isNotNull);
-            expect(overlay.key, equals(overlayKey));
-            return new Container();
-          },
+    await tester.pumpWidget(
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Overlay(
+          key: overlayKey,
+          initialEntries: <OverlayEntry>[
+            new OverlayEntry(
+              builder: (BuildContext context) {
+                didBuild = true;
+                final Overlay overlay = context.ancestorWidgetOfExactType(Overlay);
+                expect(overlay, isNotNull);
+                expect(overlay.key, equals(overlayKey));
+                return new Container();
+              },
+            ),
+          ],
         ),
-      ],
-    ));
+      ),
+    );
     expect(didBuild, isTrue);
     final RenderObject theater = overlayKey.currentContext.findRenderObject();
 
@@ -32,25 +37,29 @@ void main() {
       theater.toStringDeep(),
       equalsIgnoringHashCodes(
         '_RenderTheatre#00000\n'
-        ' │ creator: _Theatre ← Overlay-[GlobalKey#00000] ← [root]\n'
+        ' │ creator: _Theatre ← Overlay-[GlobalKey#00000] ← Directionality ←\n'
+        ' │   [root]\n'
         ' │ parentData: <none>\n'
         ' │ constraints: BoxConstraints(w=800.0, h=600.0)\n'
         ' │ size: Size(800.0, 600.0)\n'
         ' │\n'
         ' ├─onstage: RenderStack#00000\n'
-        ' ╎ │ creator: Stack ← _Theatre ← Overlay-[GlobalKey#00000] ← [root]\n'
+        ' ╎ │ creator: Stack ← _Theatre ← Overlay-[GlobalKey#00000] ←\n'
+        ' ╎ │   Directionality ← [root]\n'
         ' ╎ │ parentData: not positioned; offset=Offset(0.0, 0.0) (can use\n'
         ' ╎ │   size)\n'
         ' ╎ │ constraints: BoxConstraints(w=800.0, h=600.0)\n'
         ' ╎ │ size: Size(800.0, 600.0)\n'
-        ' ╎ │ alignment: FractionalOffset.topLeft\n'
+        ' ╎ │ alignment: FractionalOffsetDirectional.topStart\n'
+        ' ╎ │ textDirection: ltr\n'
         ' ╎ │ fit: expand\n'
         ' ╎ │ overflow: clip\n'
         ' ╎ │\n'
         ' ╎ └─child 1: RenderLimitedBox#00000\n'
         ' ╎   │ creator: LimitedBox ← Container ←\n'
         ' ╎   │   _OverlayEntry-[LabeledGlobalKey<_OverlayEntryState>#00000] ←\n'
-        ' ╎   │   Stack ← _Theatre ← Overlay-[GlobalKey#00000] ← [root]\n'
+        ' ╎   │   Stack ← _Theatre ← Overlay-[GlobalKey#00000] ← Directionality ←\n'
+        ' ╎   │   [root]\n'
         ' ╎   │ parentData: not positioned; offset=Offset(0.0, 0.0) (can use\n'
         ' ╎   │   size)\n'
         ' ╎   │ constraints: BoxConstraints(w=800.0, h=600.0)\n'
@@ -61,118 +70,133 @@ void main() {
         ' ╎   └─child: RenderConstrainedBox#00000\n'
         ' ╎       creator: ConstrainedBox ← LimitedBox ← Container ←\n'
         ' ╎         _OverlayEntry-[LabeledGlobalKey<_OverlayEntryState>#00000] ←\n'
-        ' ╎         Stack ← _Theatre ← Overlay-[GlobalKey#00000] ← [root]\n'
+        ' ╎         Stack ← _Theatre ← Overlay-[GlobalKey#00000] ← Directionality ←\n'
+        ' ╎         [root]\n'
         ' ╎       parentData: <none> (can use size)\n'
         ' ╎       constraints: BoxConstraints(w=800.0, h=600.0)\n'
         ' ╎       size: Size(800.0, 600.0)\n'
         ' ╎       additionalConstraints: BoxConstraints(biggest)\n'
         ' ╎\n'
-        ' └╌no offstage children\n',
+        ' └╌no offstage children\n'
       ),
     );
   });
 
   testWidgets('Offstage overlay', (WidgetTester tester) async {
     final GlobalKey overlayKey = new GlobalKey();
-    await tester.pumpWidget(new Overlay(
-      key: overlayKey,
-      initialEntries: <OverlayEntry>[
-        new OverlayEntry(
-          opaque: true,
-          maintainState: true,
-          builder: (BuildContext context) => new Container(),
+    await tester.pumpWidget(
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Overlay(
+          key: overlayKey,
+          initialEntries: <OverlayEntry>[
+            new OverlayEntry(
+              opaque: true,
+              maintainState: true,
+              builder: (BuildContext context) => new Container(),
+            ),
+            new OverlayEntry(
+              opaque: true,
+              maintainState: true,
+              builder: (BuildContext context) => new Container(),
+            ),
+            new OverlayEntry(
+              opaque: true,
+              maintainState: true,
+              builder: (BuildContext context) => new Container(),
+            ),
+          ],
         ),
-        new OverlayEntry(
-          opaque: true,
-          maintainState: true,
-          builder: (BuildContext context) => new Container(),
-        ),
-        new OverlayEntry(
-          opaque: true,
-          maintainState: true,
-          builder: (BuildContext context) => new Container(),
-        ),
-      ],
-    ));
+      ),
+    );
     final RenderObject theater = overlayKey.currentContext.findRenderObject();
 
     expect(theater, hasAGoodToStringDeep);
     expect(
       theater.toStringDeep(),
       equalsIgnoringHashCodes(
-          '_RenderTheatre#00000\n'
-          ' │ creator: _Theatre ← Overlay-[GlobalKey#00000] ← [root]\n'
-          ' │ parentData: <none>\n'
-          ' │ constraints: BoxConstraints(w=800.0, h=600.0)\n'
-          ' │ size: Size(800.0, 600.0)\n'
-          ' │\n'
-          ' ├─onstage: RenderStack#00000\n'
-          ' ╎ │ creator: Stack ← _Theatre ← Overlay-[GlobalKey#00000] ← [root]\n'
-          ' ╎ │ parentData: not positioned; offset=Offset(0.0, 0.0) (can use\n'
-          ' ╎ │   size)\n'
-          ' ╎ │ constraints: BoxConstraints(w=800.0, h=600.0)\n'
-          ' ╎ │ size: Size(800.0, 600.0)\n'
-          ' ╎ │ alignment: FractionalOffset.topLeft\n'
-          ' ╎ │ fit: expand\n'
-          ' ╎ │ overflow: clip\n'
-          ' ╎ │\n'
-          ' ╎ └─child 1: RenderLimitedBox#00000\n'
-          ' ╎   │ creator: LimitedBox ← Container ←\n'
-          ' ╎   │   _OverlayEntry-[LabeledGlobalKey<_OverlayEntryState>#00000] ←\n'
-          ' ╎   │   Stack ← _Theatre ← Overlay-[GlobalKey#00000] ← [root]\n'
-          ' ╎   │ parentData: not positioned; offset=Offset(0.0, 0.0) (can use\n'
-          ' ╎   │   size)\n'
-          ' ╎   │ constraints: BoxConstraints(w=800.0, h=600.0)\n'
-          ' ╎   │ size: Size(800.0, 600.0)\n'
-          ' ╎   │ maxWidth: 0.0\n'
-          ' ╎   │ maxHeight: 0.0\n'
-          ' ╎   │\n'
-          ' ╎   └─child: RenderConstrainedBox#00000\n'
-          ' ╎       creator: ConstrainedBox ← LimitedBox ← Container ←\n'
-          ' ╎         _OverlayEntry-[LabeledGlobalKey<_OverlayEntryState>#00000] ←\n'
-          ' ╎         Stack ← _Theatre ← Overlay-[GlobalKey#00000] ← [root]\n'
-          ' ╎       parentData: <none> (can use size)\n'
-          ' ╎       constraints: BoxConstraints(w=800.0, h=600.0)\n'
-          ' ╎       size: Size(800.0, 600.0)\n'
-          ' ╎       additionalConstraints: BoxConstraints(biggest)\n'
-          ' ╎\n'
-          ' ╎╌offstage 1: RenderLimitedBox#00000 NEEDS-LAYOUT NEEDS-PAINT\n'
-          ' ╎ │ creator: LimitedBox ← Container ←\n'
-          ' ╎ │   _OverlayEntry-[LabeledGlobalKey<_OverlayEntryState>#00000] ←\n'
-          ' ╎ │   TickerMode ← _Theatre ← Overlay-[GlobalKey#00000] ← [root]\n'
-          ' ╎ │ parentData: not positioned; offset=Offset(0.0, 0.0)\n'
-          ' ╎ │ constraints: MISSING\n'
-          ' ╎ │ size: MISSING\n'
-          ' ╎ │ maxWidth: 0.0\n'
-          ' ╎ │ maxHeight: 0.0\n'
-          ' ╎ │\n'
-          ' ╎ └─child: RenderConstrainedBox#00000 NEEDS-LAYOUT NEEDS-PAINT\n'
-          ' ╎     creator: ConstrainedBox ← LimitedBox ← Container ←\n'
-          ' ╎       _OverlayEntry-[LabeledGlobalKey<_OverlayEntryState>#00000] ←\n'
-          ' ╎       TickerMode ← _Theatre ← Overlay-[GlobalKey#00000] ← [root]\n'
-          ' ╎     parentData: <none>\n'
-          ' ╎     constraints: MISSING\n'
-          ' ╎     size: MISSING\n'
-          ' ╎     additionalConstraints: BoxConstraints(biggest)\n'
-          ' ╎\n'
-          ' └╌offstage 2: RenderLimitedBox#00000 NEEDS-LAYOUT NEEDS-PAINT\n'
-          '   │ creator: LimitedBox ← Container ←\n'
-          '   │   _OverlayEntry-[LabeledGlobalKey<_OverlayEntryState>#00000] ←\n'
-          '   │   TickerMode ← _Theatre ← Overlay-[GlobalKey#00000] ← [root]\n'
-          '   │ parentData: not positioned; offset=Offset(0.0, 0.0)\n'
-          '   │ constraints: MISSING\n'
-          '   │ size: MISSING\n'
-          '   │ maxWidth: 0.0\n'
-          '   │ maxHeight: 0.0\n'
-          '   │\n'
-          '   └─child: RenderConstrainedBox#00000 NEEDS-LAYOUT NEEDS-PAINT\n'
-          '       creator: ConstrainedBox ← LimitedBox ← Container ←\n'
-          '         _OverlayEntry-[LabeledGlobalKey<_OverlayEntryState>#00000] ←\n'
-          '         TickerMode ← _Theatre ← Overlay-[GlobalKey#00000] ← [root]\n'
-          '       parentData: <none>\n'
-          '       constraints: MISSING\n'
-          '       size: MISSING\n'
-          '       additionalConstraints: BoxConstraints(biggest)\n'
+        '_RenderTheatre#00000\n'
+        ' │ creator: _Theatre ← Overlay-[GlobalKey#00000] ← Directionality ←\n'
+        ' │   [root]\n'
+        ' │ parentData: <none>\n'
+        ' │ constraints: BoxConstraints(w=800.0, h=600.0)\n'
+        ' │ size: Size(800.0, 600.0)\n'
+        ' │\n'
+        ' ├─onstage: RenderStack#00000\n'
+        ' ╎ │ creator: Stack ← _Theatre ← Overlay-[GlobalKey#00000] ←\n'
+        ' ╎ │   Directionality ← [root]\n'
+        ' ╎ │ parentData: not positioned; offset=Offset(0.0, 0.0) (can use\n'
+        ' ╎ │   size)\n'
+        ' ╎ │ constraints: BoxConstraints(w=800.0, h=600.0)\n'
+        ' ╎ │ size: Size(800.0, 600.0)\n'
+        ' ╎ │ alignment: FractionalOffsetDirectional.topStart\n'
+        ' ╎ │ textDirection: ltr\n'
+        ' ╎ │ fit: expand\n'
+        ' ╎ │ overflow: clip\n'
+        ' ╎ │\n'
+        ' ╎ └─child 1: RenderLimitedBox#00000\n'
+        ' ╎   │ creator: LimitedBox ← Container ←\n'
+        ' ╎   │   _OverlayEntry-[LabeledGlobalKey<_OverlayEntryState>#00000] ←\n'
+        ' ╎   │   Stack ← _Theatre ← Overlay-[GlobalKey#00000] ← Directionality ←\n'
+        ' ╎   │   [root]\n'
+        ' ╎   │ parentData: not positioned; offset=Offset(0.0, 0.0) (can use\n'
+        ' ╎   │   size)\n'
+        ' ╎   │ constraints: BoxConstraints(w=800.0, h=600.0)\n'
+        ' ╎   │ size: Size(800.0, 600.0)\n'
+        ' ╎   │ maxWidth: 0.0\n'
+        ' ╎   │ maxHeight: 0.0\n'
+        ' ╎   │\n'
+        ' ╎   └─child: RenderConstrainedBox#00000\n'
+        ' ╎       creator: ConstrainedBox ← LimitedBox ← Container ←\n'
+        ' ╎         _OverlayEntry-[LabeledGlobalKey<_OverlayEntryState>#00000] ←\n'
+        ' ╎         Stack ← _Theatre ← Overlay-[GlobalKey#00000] ← Directionality ←\n'
+        ' ╎         [root]\n'
+        ' ╎       parentData: <none> (can use size)\n'
+        ' ╎       constraints: BoxConstraints(w=800.0, h=600.0)\n'
+        ' ╎       size: Size(800.0, 600.0)\n'
+        ' ╎       additionalConstraints: BoxConstraints(biggest)\n'
+        ' ╎\n'
+        ' ╎╌offstage 1: RenderLimitedBox#00000 NEEDS-LAYOUT NEEDS-PAINT\n'
+        ' ╎ │ creator: LimitedBox ← Container ←\n'
+        ' ╎ │   _OverlayEntry-[LabeledGlobalKey<_OverlayEntryState>#00000] ←\n'
+        ' ╎ │   TickerMode ← _Theatre ← Overlay-[GlobalKey#00000] ←\n'
+        ' ╎ │   Directionality ← [root]\n'
+        ' ╎ │ parentData: not positioned; offset=Offset(0.0, 0.0)\n'
+        ' ╎ │ constraints: MISSING\n'
+        ' ╎ │ size: MISSING\n'
+        ' ╎ │ maxWidth: 0.0\n'
+        ' ╎ │ maxHeight: 0.0\n'
+        ' ╎ │\n'
+        ' ╎ └─child: RenderConstrainedBox#00000 NEEDS-LAYOUT NEEDS-PAINT\n'
+        ' ╎     creator: ConstrainedBox ← LimitedBox ← Container ←\n'
+        ' ╎       _OverlayEntry-[LabeledGlobalKey<_OverlayEntryState>#00000] ←\n'
+        ' ╎       TickerMode ← _Theatre ← Overlay-[GlobalKey#00000] ←\n'
+        ' ╎       Directionality ← [root]\n'
+        ' ╎     parentData: <none>\n'
+        ' ╎     constraints: MISSING\n'
+        ' ╎     size: MISSING\n'
+        ' ╎     additionalConstraints: BoxConstraints(biggest)\n'
+        ' ╎\n'
+        ' └╌offstage 2: RenderLimitedBox#00000 NEEDS-LAYOUT NEEDS-PAINT\n'
+        '   │ creator: LimitedBox ← Container ←\n'
+        '   │   _OverlayEntry-[LabeledGlobalKey<_OverlayEntryState>#00000] ←\n'
+        '   │   TickerMode ← _Theatre ← Overlay-[GlobalKey#00000] ←\n'
+        '   │   Directionality ← [root]\n'
+        '   │ parentData: not positioned; offset=Offset(0.0, 0.0)\n'
+        '   │ constraints: MISSING\n'
+        '   │ size: MISSING\n'
+        '   │ maxWidth: 0.0\n'
+        '   │ maxHeight: 0.0\n'
+        '   │\n'
+        '   └─child: RenderConstrainedBox#00000 NEEDS-LAYOUT NEEDS-PAINT\n'
+        '       creator: ConstrainedBox ← LimitedBox ← Container ←\n'
+        '         _OverlayEntry-[LabeledGlobalKey<_OverlayEntryState>#00000] ←\n'
+        '         TickerMode ← _Theatre ← Overlay-[GlobalKey#00000] ←\n'
+        '         Directionality ← [root]\n'
+        '       parentData: <none>\n'
+        '       constraints: MISSING\n'
+        '       size: MISSING\n'
+        '       additionalConstraints: BoxConstraints(biggest)\n'
       ),
     );
   });
diff --git a/packages/flutter/test/widgets/parent_data_test.dart b/packages/flutter/test/widgets/parent_data_test.dart
index 1175ff9aeb..c28fe85deb 100644
--- a/packages/flutter/test/widgets/parent_data_test.dart
+++ b/packages/flutter/test/widgets/parent_data_test.dart
@@ -52,16 +52,17 @@ void main() {
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new DecoratedBox(decoration: kBoxDecorationA),
           new Positioned(
             top: 10.0,
             left: 10.0,
-            child: new DecoratedBox(decoration: kBoxDecorationB)
+            child: new DecoratedBox(decoration: kBoxDecorationB),
           ),
           new DecoratedBox(decoration: kBoxDecorationC),
-        ]
-      )
+        ],
+      ),
     );
 
     checkTree(tester, <TestParentData>[
@@ -72,20 +73,21 @@ void main() {
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new Positioned(
             bottom: 5.0,
             right: 7.0,
-            child: new DecoratedBox(decoration: kBoxDecorationA)
+            child: new DecoratedBox(decoration: kBoxDecorationA),
           ),
           new Positioned(
             top: 10.0,
             left: 10.0,
-            child: new DecoratedBox(decoration: kBoxDecorationB)
+            child: new DecoratedBox(decoration: kBoxDecorationB),
           ),
           new DecoratedBox(decoration: kBoxDecorationC),
-        ]
-      )
+        ],
+      ),
     );
 
     checkTree(tester, <TestParentData>[
@@ -100,20 +102,21 @@ void main() {
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new Positioned(
             bottom: 5.0,
             right: 7.0,
-            child: kDecoratedBoxA
+            child: kDecoratedBoxA,
           ),
           new Positioned(
             top: 10.0,
             left: 10.0,
-            child: kDecoratedBoxB
+            child: kDecoratedBoxB,
           ),
           kDecoratedBoxC,
-        ]
-      )
+        ],
+      ),
     );
 
     checkTree(tester, <TestParentData>[
@@ -124,20 +127,21 @@ void main() {
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new Positioned(
             bottom: 6.0,
             right: 8.0,
-            child: kDecoratedBoxA
+            child: kDecoratedBoxA,
           ),
           new Positioned(
             left: 10.0,
             right: 10.0,
-            child: kDecoratedBoxB
+            child: kDecoratedBoxB,
           ),
           kDecoratedBoxC,
-        ]
-      )
+        ],
+      ),
     );
 
     checkTree(tester, <TestParentData>[
@@ -148,16 +152,17 @@ void main() {
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           kDecoratedBoxA,
           new Positioned(
             left: 11.0,
             right: 12.0,
-            child: new Container(child: kDecoratedBoxB)
+            child: new Container(child: kDecoratedBoxB),
           ),
           kDecoratedBoxC,
-        ]
-      )
+        ],
+      ),
     );
 
     checkTree(tester, <TestParentData>[
@@ -168,20 +173,21 @@ void main() {
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           kDecoratedBoxA,
           new Positioned(
             right: 10.0,
-            child: new Container(child: kDecoratedBoxB)
+            child: new Container(child: kDecoratedBoxB),
           ),
           new Container(
             child: new Positioned(
               top: 8.0,
-              child: kDecoratedBoxC
-            )
-          )
-        ]
-      )
+              child: kDecoratedBoxC,
+            ),
+          ),
+        ],
+      ),
     );
 
     checkTree(tester, <TestParentData>[
@@ -192,13 +198,14 @@ void main() {
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new Positioned(
             right: 10.0,
-            child: new FlipWidget(left: kDecoratedBoxA, right: kDecoratedBoxB)
+            child: new FlipWidget(left: kDecoratedBoxA, right: kDecoratedBoxB),
           ),
-        ]
-      )
+        ],
+      ),
     );
 
     checkTree(tester, <TestParentData>[
@@ -214,13 +221,14 @@ void main() {
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new Positioned(
             top: 7.0,
-            child: new FlipWidget(left: kDecoratedBoxA, right: kDecoratedBoxB)
+            child: new FlipWidget(left: kDecoratedBoxA, right: kDecoratedBoxB),
           ),
-        ]
-      )
+        ],
+      ),
     );
 
     checkTree(tester, <TestParentData>[
@@ -235,7 +243,7 @@ void main() {
     ]);
 
     await tester.pumpWidget(
-      new Stack()
+      new Stack(textDirection: TextDirection.ltr)
     );
 
     checkTree(tester, <TestParentData>[]);
@@ -244,6 +252,7 @@ void main() {
   testWidgets('ParentDataWidget conflicting data', (WidgetTester tester) async {
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new Positioned(
             top: 5.0,
@@ -251,15 +260,15 @@ void main() {
             child: new Positioned(
               top: 6.0,
               left: 7.0,
-              child: new DecoratedBox(decoration: kBoxDecorationB)
-            )
-          )
-        ]
-      )
+              child: new DecoratedBox(decoration: kBoxDecorationB),
+            ),
+          ),
+        ],
+      ),
     );
     expect(tester.takeException(), isFlutterError);
 
-    await tester.pumpWidget(new Stack());
+    await tester.pumpWidget(new Stack(textDirection: TextDirection.ltr));
 
     checkTree(tester, <TestParentData>[]);
 
@@ -270,16 +279,16 @@ void main() {
             new Positioned(
               top: 6.0,
               left: 7.0,
-              child: new DecoratedBox(decoration: kBoxDecorationB)
-            )
-          ]
-        )
-      )
+              child: new DecoratedBox(decoration: kBoxDecorationB),
+            ),
+          ],
+        ),
+      ),
     );
     expect(tester.takeException(), isFlutterError);
 
     await tester.pumpWidget(
-      new Stack()
+      new Stack(textDirection: TextDirection.ltr)
     );
 
     checkTree(tester, <TestParentData>[]);
@@ -290,14 +299,15 @@ void main() {
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new Positioned(
             top: 10.0,
             left: 10.0,
-            child: new DecoratedBox(key: key, decoration: kBoxDecorationA)
-          )
-        ]
-      )
+            child: new DecoratedBox(key: key, decoration: kBoxDecorationA),
+          ),
+        ],
+      ),
     );
 
     checkTree(tester, <TestParentData>[
@@ -306,17 +316,18 @@ void main() {
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new Positioned(
             top: 10.0,
             left: 10.0,
             child: new DecoratedBox(
               decoration: kBoxDecorationB,
-              child: new DecoratedBox(key: key, decoration: kBoxDecorationA)
-            )
-          )
-        ]
-      )
+              child: new DecoratedBox(key: key, decoration: kBoxDecorationA),
+            ),
+          ),
+        ],
+      ),
     );
 
     checkTree(tester, <TestParentData>[
@@ -325,14 +336,15 @@ void main() {
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new Positioned(
             top: 10.0,
             left: 10.0,
-            child: new DecoratedBox(key: key, decoration: kBoxDecorationA)
-          )
-        ]
-      )
+            child: new DecoratedBox(key: key, decoration: kBoxDecorationA),
+          ),
+        ],
+      ),
     );
 
     checkTree(tester, <TestParentData>[
@@ -344,6 +356,7 @@ void main() {
     await tester.pumpWidget(new Row(
       children: <Widget>[
         new Stack(
+        textDirection: TextDirection.ltr,
           children: <Widget>[
             new Expanded(
               child: new Container()
diff --git a/packages/flutter/test/widgets/placeholder_test.dart b/packages/flutter/test/widgets/placeholder_test.dart
index 1b4d3f1db5..a286af7463 100644
--- a/packages/flutter/test/widgets/placeholder_test.dart
+++ b/packages/flutter/test/widgets/placeholder_test.dart
@@ -13,11 +13,11 @@ void main() {
     expect(tester.renderObject<RenderBox>(find.byType(Placeholder)).size, const Size(800.0, 600.0));
     await tester.pumpWidget(const Center(child: const Placeholder()));
     expect(tester.renderObject<RenderBox>(find.byType(Placeholder)).size, const Size(800.0, 600.0));
-    await tester.pumpWidget(new Stack(children: <Widget>[const Positioned(top: 0.0, bottom: 0.0, child: const Placeholder())]));
+    await tester.pumpWidget(new Stack(textDirection: TextDirection.ltr, children: <Widget>[const Positioned(top: 0.0, bottom: 0.0, child: const Placeholder())]));
     expect(tester.renderObject<RenderBox>(find.byType(Placeholder)).size, const Size(400.0, 600.0));
-    await tester.pumpWidget(new Stack(children: <Widget>[const Positioned(left: 0.0, right: 0.0, child: const Placeholder())]));
+    await tester.pumpWidget(new Stack(textDirection: TextDirection.ltr, children: <Widget>[const Positioned(left: 0.0, right: 0.0, child: const Placeholder())]));
     expect(tester.renderObject<RenderBox>(find.byType(Placeholder)).size, const Size(800.0, 400.0));
-    await tester.pumpWidget(new Stack(children: <Widget>[const Positioned(top: 0.0, child: const Placeholder(fallbackWidth: 200.0, fallbackHeight: 300.0))]));
+    await tester.pumpWidget(new Stack(textDirection: TextDirection.ltr, children: <Widget>[const Positioned(top: 0.0, child: const Placeholder(fallbackWidth: 200.0, fallbackHeight: 300.0))]));
     expect(tester.renderObject<RenderBox>(find.byType(Placeholder)).size, const Size(200.0, 300.0));
   });
 
diff --git a/packages/flutter/test/widgets/positioned_test.dart b/packages/flutter/test/widgets/positioned_test.dart
index 7dc912258e..454259ac8e 100644
--- a/packages/flutter/test/widgets/positioned_test.dart
+++ b/packages/flutter/test/widgets/positioned_test.dart
@@ -60,11 +60,11 @@ void main() {
     final RelativeRectTween rect = new RelativeRectTween(
       begin: new RelativeRect.fromRect(
         new Rect.fromLTRB(10.0, 20.0, 20.0, 30.0),
-        new Rect.fromLTRB(0.0, 10.0, 100.0, 110.0)
+        new Rect.fromLTRB(0.0, 10.0, 100.0, 110.0),
       ),
       end: new RelativeRect.fromRect(
         new Rect.fromLTRB(80.0, 90.0, 90.0, 100.0),
-        new Rect.fromLTRB(0.0, 10.0, 100.0, 110.0)
+        new Rect.fromLTRB(0.0, 10.0, 100.0, 110.0),
       )
     );
     final AnimationController controller = new AnimationController(
@@ -83,22 +83,25 @@ void main() {
     }
 
     await tester.pumpWidget(
-      new Center(
-        child: new Container(
-          height: 100.0,
-          width: 100.0,
-          child: new Stack(
-            children: <Widget>[
-              new PositionedTransition(
-                rect: rect.animate(controller),
-                child: new Container(
-                  key: key
-                )
-              )
-            ]
-          )
-        )
-      )
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Center(
+          child: new Container(
+            height: 100.0,
+            width: 100.0,
+            child: new Stack(
+              children: <Widget>[
+                new PositionedTransition(
+                  rect: rect.animate(controller),
+                  child: new Container(
+                    key: key,
+                  ),
+                ),
+              ],
+            ),
+          ),
+        ),
+      ),
     ); // t=0
     recordMetrics();
     final Completer<Null> completer = new Completer<Null>();
diff --git a/packages/flutter/test/widgets/reparent_state_harder_test.dart b/packages/flutter/test/widgets/reparent_state_harder_test.dart
index 0c786b5ac1..b279281443 100644
--- a/packages/flutter/test/widgets/reparent_state_harder_test.dart
+++ b/packages/flutter/test/widgets/reparent_state_harder_test.dart
@@ -38,7 +38,8 @@ class OrderSwitcherState extends State<OrderSwitcher> {
       children.add(widget.a);
     }
     return new Stack(
-      children: children
+      textDirection: TextDirection.ltr,
+      children: children,
     );
   }
 }
diff --git a/packages/flutter/test/widgets/reparent_state_test.dart b/packages/flutter/test/widgets/reparent_state_test.dart
index e02565e487..706abf40b7 100644
--- a/packages/flutter/test/widgets/reparent_state_test.dart
+++ b/packages/flutter/test/widgets/reparent_state_test.dart
@@ -56,6 +56,7 @@ void main() {
     final StateMarker grandchild = const StateMarker();
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new Container(
             child: new StateMarker(key: left)
@@ -82,6 +83,7 @@ void main() {
     final StateMarker newGrandchild = const StateMarker();
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new Container(
             child: new StateMarker(
@@ -129,6 +131,7 @@ void main() {
     final StateMarker grandchild = const StateMarker();
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new StateMarker(key: left),
           new StateMarker(
@@ -151,6 +154,7 @@ void main() {
     final StateMarker newGrandchild = const StateMarker();
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new StateMarker(
             key: right,
@@ -224,6 +228,7 @@ void main() {
     final GlobalKey key = new GlobalKey();
 
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new StateMarker(key: key),
         new Container(width: 100.0, height: 100.0),
@@ -234,6 +239,7 @@ void main() {
     keyState.marker = "marked";
 
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(width: 100.0, height: 100.0),
         new StateMarker(key: key),
@@ -244,6 +250,7 @@ void main() {
     expect(keyState.marker, equals("marked"));
 
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new StateMarker(key: key),
         new Container(width: 100.0, height: 100.0),
@@ -258,6 +265,7 @@ void main() {
     final GlobalKey key = new GlobalKey();
 
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(width: 100.0, height: 100.0),
         new StateMarker(key: key),
@@ -269,6 +277,7 @@ void main() {
     keyState.marker = "marked";
 
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(width: 100.0, height: 100.0, child: new StateMarker(key: key)),
         new Container(width: 100.0, height: 100.0),
@@ -279,6 +288,7 @@ void main() {
     expect(keyState.marker, equals("marked"));
 
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(width: 100.0, height: 100.0),
         new StateMarker(key: key),
@@ -290,6 +300,7 @@ void main() {
     expect(keyState.marker, equals("marked"));
 
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(width: 100.0, height: 100.0),
         new Container(width: 100.0, height: 100.0, child: new StateMarker(key: key)),
@@ -300,6 +311,7 @@ void main() {
     expect(keyState.marker, equals("marked"));
 
     await tester.pumpWidget(new Stack(
+      textDirection: TextDirection.ltr,
       children: <Widget>[
         new Container(width: 100.0, height: 100.0),
         new StateMarker(key: key),
diff --git a/packages/flutter/test/widgets/routes_test.dart b/packages/flutter/test/widgets/routes_test.dart
index a9958caf76..70dbf73046 100644
--- a/packages/flutter/test/widgets/routes_test.dart
+++ b/packages/flutter/test/widgets/routes_test.dart
@@ -109,10 +109,15 @@ void main() {
 
   testWidgets('Route management - push, replace, pop', (WidgetTester tester) async {
     final GlobalKey<NavigatorState> navigatorKey = new GlobalKey<NavigatorState>();
-    await tester.pumpWidget(new Navigator(
-      key: navigatorKey,
-      onGenerateRoute: (_) => new TestRoute('initial')
-    ));
+    await tester.pumpWidget(
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Navigator(
+          key: navigatorKey,
+          onGenerateRoute: (_) => new TestRoute('initial'),
+        ),
+      ),
+    );
     final NavigatorState host = navigatorKey.currentState;
     await runNavigatorTest(
       tester,
@@ -187,10 +192,15 @@ void main() {
 
   testWidgets('Route management - push, remove, pop', (WidgetTester tester) async {
     final GlobalKey<NavigatorState> navigatorKey = new GlobalKey<NavigatorState>();
-    await tester.pumpWidget(new Navigator(
-      key: navigatorKey,
-      onGenerateRoute: (_) => new TestRoute('first')
-    ));
+    await tester.pumpWidget(
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Navigator(
+          key: navigatorKey,
+          onGenerateRoute: (_) => new TestRoute('first')
+        ),
+      ),
+    );
     final NavigatorState host = navigatorKey.currentState;
     await runNavigatorTest(
       tester,
@@ -293,10 +303,15 @@ void main() {
 
   testWidgets('Route management - push, replace, popUntil', (WidgetTester tester) async {
     final GlobalKey<NavigatorState> navigatorKey = new GlobalKey<NavigatorState>();
-    await tester.pumpWidget(new Navigator(
-      key: navigatorKey,
-      onGenerateRoute: (_) => new TestRoute('A')
-    ));
+    await tester.pumpWidget(
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Navigator(
+          key: navigatorKey,
+          onGenerateRoute: (_) => new TestRoute('A')
+        ),
+      ),
+    );
     final NavigatorState host = navigatorKey.currentState;
     await runNavigatorTest(
       tester,
@@ -370,10 +385,15 @@ void main() {
       onRemove: () { routeA.log('onRemove 1'); }
     ));
     final GlobalKey<NavigatorState> navigatorKey = new GlobalKey<NavigatorState>();
-    await tester.pumpWidget(new Navigator(
-      key: navigatorKey,
-      onGenerateRoute: (_) => routeA
-    ));
+    await tester.pumpWidget(
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Navigator(
+          key: navigatorKey,
+          onGenerateRoute: (_) => routeA
+        ),
+      ),
+    );
     final NavigatorState host = navigatorKey.currentState;
     await runNavigatorTest(
       tester,
diff --git a/packages/flutter/test/widgets/semantics_5_test.dart b/packages/flutter/test/widgets/semantics_5_test.dart
index 7ff598f93b..3284e78776 100644
--- a/packages/flutter/test/widgets/semantics_5_test.dart
+++ b/packages/flutter/test/widgets/semantics_5_test.dart
@@ -14,6 +14,7 @@ void main() {
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         fit: StackFit.expand,
         children: <Widget>[
           const Semantics(
diff --git a/packages/flutter/test/widgets/semantics_8_test.dart b/packages/flutter/test/widgets/semantics_8_test.dart
index f7fa9205d2..58f1c8107a 100644
--- a/packages/flutter/test/widgets/semantics_8_test.dart
+++ b/packages/flutter/test/widgets/semantics_8_test.dart
@@ -21,6 +21,7 @@ void main() {
           child: new Semantics(
             container: true,
             child: new Stack(
+              textDirection: TextDirection.ltr,
               children: <Widget>[
                 const Semantics(
                   checked: true,
@@ -52,6 +53,7 @@ void main() {
           child: new Semantics(
             container: true,
             child: new Stack(
+              textDirection: TextDirection.ltr,
               children: <Widget>[
                 const Semantics(
                   label: 'label',
diff --git a/packages/flutter/test/widgets/semantics_9_test.dart b/packages/flutter/test/widgets/semantics_9_test.dart
index cbe0db7cf7..4480f2ffdf 100644
--- a/packages/flutter/test/widgets/semantics_9_test.dart
+++ b/packages/flutter/test/widgets/semantics_9_test.dart
@@ -15,6 +15,7 @@ void main() {
       final SemanticsTester semantics = new SemanticsTester(tester);
 
       await tester.pumpWidget(new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new Semantics(
             label: 'layer#1',
@@ -33,6 +34,7 @@ void main() {
       expect(semantics, isNot(includesNodeWith(label: 'layer#1')));
 
       await tester.pumpWidget(new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new Semantics(
             label: 'layer#1',
diff --git a/packages/flutter/test/widgets/semantics_debugger_test.dart b/packages/flutter/test/widgets/semantics_debugger_test.dart
index 2ee479837e..9be6e32b81 100644
--- a/packages/flutter/test/widgets/semantics_debugger_test.dart
+++ b/packages/flutter/test/widgets/semantics_debugger_test.dart
@@ -12,22 +12,8 @@ void main() {
 
     // This is a smoketest to verify that adding a debugger doesn't crash.
     await tester.pumpWidget(
-      new Stack(
-        children: <Widget>[
-          const Semantics(),
-          const Semantics(
-            container: true,
-          ),
-          const Semantics(
-            label: 'label',
-            textDirection: TextDirection.ltr,
-          ),
-        ],
-      ),
-    );
-
-    await tester.pumpWidget(
-      new SemanticsDebugger(
+      new Directionality(
+        textDirection: TextDirection.ltr,
         child: new Stack(
           children: <Widget>[
             const Semantics(),
@@ -43,6 +29,26 @@ void main() {
       ),
     );
 
+    await tester.pumpWidget(
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new SemanticsDebugger(
+          child: new Stack(
+            children: <Widget>[
+              const Semantics(),
+              const Semantics(
+                container: true,
+              ),
+              const Semantics(
+                label: 'label',
+                textDirection: TextDirection.ltr,
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+
     expect(true, isTrue); // expect that we reach here without crashing
   });
 
@@ -51,71 +57,80 @@ void main() {
     final GlobalKey key = new GlobalKey();
 
     await tester.pumpWidget(
-      new SemanticsDebugger(
-        child: new Stack(
-          children: <Widget>[
-            const Semantics(label: 'label1', textDirection: TextDirection.ltr),
-            new Positioned(
-              key: key,
-              left: 0.0,
-              top: 0.0,
-              width: 100.0,
-              height: 100.0,
-              child: const Semantics(label: 'label2', textDirection: TextDirection.ltr),
-            ),
-          ],
-        ),
-      ),
-    );
-
-    await tester.pumpWidget(
-      new SemanticsDebugger(
-        child: new Stack(
-          children: <Widget>[
-            const Semantics(label: 'label1', textDirection: TextDirection.ltr),
-            new Semantics(
-              container: true,
-              child: new Stack(
-                children: <Widget>[
-                  new Positioned(
-                    key: key,
-                    left: 0.0,
-                    top: 0.0,
-                    width: 100.0,
-                    height: 100.0,
-                    child: const Semantics(label: 'label2', textDirection: TextDirection.ltr),
-                  ),
-                  const Semantics(label: 'label3', textDirection: TextDirection.ltr),
-                ],
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new SemanticsDebugger(
+          child: new Stack(
+            children: <Widget>[
+              const Semantics(label: 'label1', textDirection: TextDirection.ltr),
+              new Positioned(
+                key: key,
+                left: 0.0,
+                top: 0.0,
+                width: 100.0,
+                height: 100.0,
+                child: const Semantics(label: 'label2', textDirection: TextDirection.ltr),
               ),
-            ),
-          ],
+            ],
+          ),
         ),
       ),
     );
 
     await tester.pumpWidget(
-      new SemanticsDebugger(
-        child: new Stack(
-          children: <Widget>[
-            const Semantics(label: 'label1', textDirection: TextDirection.ltr),
-            new Semantics(
-              container: true,
-              child: new Stack(
-                children: <Widget>[
-                  new Positioned(
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new SemanticsDebugger(
+          child: new Stack(
+            children: <Widget>[
+              const Semantics(label: 'label1', textDirection: TextDirection.ltr),
+              new Semantics(
+                container: true,
+                child: new Stack(
+                  children: <Widget>[
+                    new Positioned(
                       key: key,
                       left: 0.0,
                       top: 0.0,
                       width: 100.0,
                       height: 100.0,
-                      child: const Semantics(label: 'label2', textDirection: TextDirection.ltr)),
-                  const Semantics(label: 'label3', textDirection: TextDirection.ltr),
-                  const Semantics(label: 'label4', textDirection: TextDirection.ltr),
-                ],
+                      child: const Semantics(label: 'label2', textDirection: TextDirection.ltr),
+                    ),
+                    const Semantics(label: 'label3', textDirection: TextDirection.ltr),
+                  ],
+                ),
               ),
-            ),
-          ],
+            ],
+          ),
+        ),
+      ),
+    );
+
+    await tester.pumpWidget(
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new SemanticsDebugger(
+          child: new Stack(
+            children: <Widget>[
+              const Semantics(label: 'label1', textDirection: TextDirection.ltr),
+              new Semantics(
+                container: true,
+                child: new Stack(
+                  children: <Widget>[
+                    new Positioned(
+                        key: key,
+                        left: 0.0,
+                        top: 0.0,
+                        width: 100.0,
+                        height: 100.0,
+                        child: const Semantics(label: 'label2', textDirection: TextDirection.ltr)),
+                    const Semantics(label: 'label3', textDirection: TextDirection.ltr),
+                    const Semantics(label: 'label4', textDirection: TextDirection.ltr),
+                  ],
+                ),
+              ),
+            ],
+          ),
         ),
       ),
     );
@@ -250,13 +265,16 @@ void main() {
     bool didLongPress = false;
 
     await tester.pumpWidget(
-      new SemanticsDebugger(
-        child: new GestureDetector(
-          onLongPress: () {
-            expect(didLongPress, isFalse);
-            didLongPress = true;
-          },
-          child: const Text('target', textDirection: TextDirection.ltr),
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new SemanticsDebugger(
+          child: new GestureDetector(
+            onLongPress: () {
+              expect(didLongPress, isFalse);
+              didLongPress = true;
+            },
+            child: const Text('target', textDirection: TextDirection.ltr),
+          ),
         ),
       ),
     );
@@ -269,16 +287,19 @@ void main() {
     double value = 0.75;
 
     await tester.pumpWidget(
-      new SemanticsDebugger(
-        child: new Directionality(
-          textDirection: TextDirection.ltr,
-          child: new Material(
-            child: new Center(
-              child: new Slider(
-                value: value,
-                onChanged: (double newValue) {
-                  value = newValue;
-                },
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new SemanticsDebugger(
+          child: new Directionality(
+            textDirection: TextDirection.ltr,
+            child: new Material(
+              child: new Center(
+                child: new Slider(
+                  value: value,
+                  onChanged: (double newValue) {
+                    value = newValue;
+                  },
+                ),
               ),
             ),
           ),
diff --git a/packages/flutter/test/widgets/stack_test.dart b/packages/flutter/test/widgets/stack_test.dart
index 31c984060c..b2178f78cd 100644
--- a/packages/flutter/test/widgets/stack_test.dart
+++ b/packages/flutter/test/widgets/stack_test.dart
@@ -19,11 +19,21 @@ class TestPaintingContext implements PaintingContext {
 
 void main() {
   testWidgets('Can construct an empty Stack', (WidgetTester tester) async {
-    await tester.pumpWidget(new Stack());
+    await tester.pumpWidget(
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Stack(),
+      ),
+    );
   });
 
   testWidgets('Can construct an empty Centered Stack', (WidgetTester tester) async {
-    await tester.pumpWidget(new Center(child: new Stack()));
+    await tester.pumpWidget(
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Center(child: new Stack()),
+      ),
+    );
   });
 
   testWidgets('Can change position data', (WidgetTester tester) async {
@@ -31,17 +41,18 @@ void main() {
 
     await tester.pumpWidget(
       new Stack(
+        alignment: FractionalOffset.topLeft,
         children: <Widget>[
           new Positioned(
             left: 10.0,
             child: new Container(
               key: key,
               width: 10.0,
-              height: 10.0
-            )
-          )
-        ]
-      )
+              height: 10.0,
+            ),
+          ),
+        ],
+      ),
     );
 
     Element container;
@@ -58,17 +69,18 @@ void main() {
 
     await tester.pumpWidget(
       new Stack(
+        alignment: FractionalOffset.topLeft,
         children: <Widget>[
           new Positioned(
             right: 10.0,
             child: new Container(
               key: key,
               width: 10.0,
-              height: 10.0
-            )
-          )
-        ]
-      )
+              height: 10.0,
+            ),
+          ),
+        ],
+      ),
     );
 
     container = tester.element(find.byKey(key));
@@ -85,7 +97,12 @@ void main() {
     final Key key = const Key('container');
     final Container container = new Container(key: key, width: 10.0, height: 10.0);
 
-    await tester.pumpWidget(new Stack(children: <Widget>[ new Positioned(left: 10.0, child: container) ]));
+    await tester.pumpWidget(
+      new Stack(
+        textDirection: TextDirection.ltr,
+        children: <Widget>[ new Positioned(left: 10.0, child: container) ],
+      ),
+    );
     Element containerElement = tester.element(find.byKey(key));
 
     StackParentData parentData;
@@ -97,7 +114,12 @@ void main() {
     expect(parentData.width, isNull);
     expect(parentData.height, isNull);
 
-    await tester.pumpWidget(new Stack(children: <Widget>[ container ]));
+    await tester.pumpWidget(
+      new Stack(
+        textDirection: TextDirection.ltr,
+        children: <Widget>[ container ],
+      ),
+    );
     containerElement = tester.element(find.byKey(key));
 
     parentData = containerElement.renderObject.parentData;
@@ -109,20 +131,23 @@ void main() {
     expect(parentData.height, isNull);
   });
 
-  testWidgets('Can align non-positioned children', (WidgetTester tester) async {
+  testWidgets('Can align non-positioned children (LTR)', (WidgetTester tester) async {
     final Key child0Key = const Key('child0');
     final Key child1Key = const Key('child1');
 
     await tester.pumpWidget(
-      new Center(
-        child: new Stack(
-          children: <Widget>[
-            new Container(key: child0Key, width: 20.0, height: 20.0),
-            new Container(key: child1Key, width: 10.0, height: 10.0)
-          ],
-          alignment: const FractionalOffset(0.5, 0.5)
-        )
-      )
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Center(
+          child: new Stack(
+            alignment: FractionalOffset.center,
+            children: <Widget>[
+              new Container(key: child0Key, width: 20.0, height: 20.0),
+              new Container(key: child1Key, width: 10.0, height: 10.0),
+            ],
+          ),
+        ),
+      ),
     );
 
     final Element child0 = tester.element(find.byKey(child0Key));
@@ -132,14 +157,88 @@ void main() {
     final Element child1 = tester.element(find.byKey(child1Key));
     final StackParentData child1RenderObjectParentData = child1.renderObject.parentData;
     expect(child1RenderObjectParentData.offset, equals(const Offset(5.0, 5.0)));
+
+    await tester.pumpWidget(
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Center(
+          child: new Stack(
+            alignment: FractionalOffsetDirectional.bottomEnd,
+            children: <Widget>[
+              new Container(key: child0Key, width: 20.0, height: 20.0),
+              new Container(key: child1Key, width: 10.0, height: 10.0),
+            ],
+          ),
+        ),
+      ),
+    );
+
+    expect(child0RenderObjectParentData.offset, equals(const Offset(0.0, 0.0)));
+    expect(child1RenderObjectParentData.offset, equals(const Offset(10.0, 10.0)));
+  });
+
+  testWidgets('Can align non-positioned children (RTL)', (WidgetTester tester) async {
+    final Key child0Key = const Key('child0');
+    final Key child1Key = const Key('child1');
+
+    await tester.pumpWidget(
+      new Directionality(
+        textDirection: TextDirection.rtl,
+        child: new Center(
+          child: new Stack(
+            alignment: FractionalOffset.center,
+            children: <Widget>[
+              new Container(key: child0Key, width: 20.0, height: 20.0),
+              new Container(key: child1Key, width: 10.0, height: 10.0),
+            ],
+          ),
+        ),
+      ),
+    );
+
+    final Element child0 = tester.element(find.byKey(child0Key));
+    final StackParentData child0RenderObjectParentData = child0.renderObject.parentData;
+    expect(child0RenderObjectParentData.offset, equals(const Offset(0.0, 0.0)));
+
+    final Element child1 = tester.element(find.byKey(child1Key));
+    final StackParentData child1RenderObjectParentData = child1.renderObject.parentData;
+    expect(child1RenderObjectParentData.offset, equals(const Offset(5.0, 5.0)));
+
+    await tester.pumpWidget(
+      new Directionality(
+        textDirection: TextDirection.rtl,
+        child: new Center(
+          child: new Stack(
+            alignment: FractionalOffsetDirectional.bottomEnd,
+            children: <Widget>[
+              new Container(key: child0Key, width: 20.0, height: 20.0),
+              new Container(key: child1Key, width: 10.0, height: 10.0),
+            ],
+          ),
+        ),
+      ),
+    );
+
+    expect(child0RenderObjectParentData.offset, equals(const Offset(0.0, 0.0)));
+    expect(child1RenderObjectParentData.offset, equals(const Offset(0.0, 10.0)));
   });
 
   testWidgets('Can construct an empty IndexedStack', (WidgetTester tester) async {
-    await tester.pumpWidget(new IndexedStack());
+    await tester.pumpWidget(
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new IndexedStack(),
+      ),
+    );
   });
 
   testWidgets('Can construct an empty Centered IndexedStack', (WidgetTester tester) async {
-    await tester.pumpWidget(new Center(child: new IndexedStack()));
+    await tester.pumpWidget(
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Center(child: new IndexedStack()),
+      ),
+    );
   });
 
   testWidgets('Can construct an IndexedStack', (WidgetTester tester) async {
@@ -153,10 +252,16 @@ void main() {
           child: new Text('$i', textDirection: TextDirection.ltr),
           painter: new TestCallbackPainter(
             onPaint: () { itemsPainted.add(i); }
-          )
+          ),
         );
       });
-      return new Center(child: new IndexedStack(children: items, index: index));
+      return new Center(
+        child: new IndexedStack(
+          alignment: FractionalOffset.topLeft,
+          children: items,
+          index: index,
+        ),
+      );
     }
 
     await tester.pumpWidget(buildFrame(0));
@@ -182,7 +287,14 @@ void main() {
       final List<Widget> items = new List<Widget>.generate(itemCount, (int i) {
         return new GestureDetector(child: new Text('$i', textDirection: TextDirection.ltr), onTap: () { itemsTapped.add(i); });
       });
-      return new Center(child: new IndexedStack(children: items, key: key, index: index));
+      return new Center(
+        child: new IndexedStack(
+          alignment: FractionalOffset.topLeft,
+          children: items,
+          key: key,
+          index: index,
+        ),
+      );
     }
 
     await tester.pumpWidget(buildFrame(0));
@@ -205,15 +317,16 @@ void main() {
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new Positioned(
             left: 10.0,
             width: 11.0,
             height: 12.0,
-            child: new DecoratedBox(key: key, decoration: kBoxDecoration)
-          )
-        ]
-      )
+            child: new DecoratedBox(key: key, decoration: kBoxDecoration),
+          ),
+        ],
+      ),
     );
 
     Element box;
@@ -236,15 +349,16 @@ void main() {
 
     await tester.pumpWidget(
       new Stack(
+        textDirection: TextDirection.ltr,
         children: <Widget>[
           new Positioned(
             right: 10.0,
             width: 11.0,
             height: 12.0,
-            child: new DecoratedBox(key: key, decoration: kBoxDecoration)
-          )
-        ]
-      )
+            child: new DecoratedBox(key: key, decoration: kBoxDecoration),
+          ),
+        ],
+      ),
     );
 
     box = tester.element(find.byKey(key));
@@ -266,19 +380,22 @@ void main() {
     bool tapped;
 
     await tester.pumpWidget(
-      new Center(
-        child: new IndexedStack(
-          index: null,
-          children: <Widget>[
-            new GestureDetector(
-              behavior: HitTestBehavior.opaque,
-              onTap: () { print("HELLO"); tapped = true; },
-              child: const SizedBox(
-                width: 200.0,
-                height: 200.0,
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Center(
+          child: new IndexedStack(
+            index: null,
+            children: <Widget>[
+              new GestureDetector(
+                behavior: HitTestBehavior.opaque,
+                onTap: () { print("HELLO"); tapped = true; },
+                child: const SizedBox(
+                  width: 200.0,
+                  height: 200.0,
+                ),
               ),
-            ),
-          ],
+            ],
+          ),
         ),
       ),
     );
@@ -291,24 +408,27 @@ void main() {
 
   testWidgets('Stack clip test', (WidgetTester tester) async {
     await tester.pumpWidget(
-      new Center(
-        child: new Stack(
-          children: <Widget>[
-            new Container(
-              width: 100.0,
-              height: 100.0
-            ),
-            new Positioned(
-              top: 0.0,
-              left: 0.0,
-              child: new Container(
-                width: 200.0,
-                height: 200.0
-              )
-            )
-          ]
-        )
-      )
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Center(
+          child: new Stack(
+            children: <Widget>[
+              new Container(
+                width: 100.0,
+                height: 100.0,
+              ),
+              new Positioned(
+                top: 0.0,
+                left: 0.0,
+                child: new Container(
+                  width: 200.0,
+                  height: 200.0,
+                ),
+              ),
+            ],
+          ),
+        ),
+      ),
     );
 
     RenderBox box = tester.renderObject(find.byType(Stack));
@@ -317,25 +437,28 @@ void main() {
     expect(context.invocations.first.memberName, equals(#pushClipRect));
 
     await tester.pumpWidget(
-      new Center(
-        child: new Stack(
-          overflow: Overflow.visible,
-          children: <Widget>[
-            new Container(
-              width: 100.0,
-              height: 100.0
-            ),
-            new Positioned(
-              top: 0.0,
-              left: 0.0,
-              child: new Container(
-                width: 200.0,
-                height: 200.0
-              )
-            )
-          ]
-        )
-      )
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Center(
+          child: new Stack(
+            overflow: Overflow.visible,
+            children: <Widget>[
+              new Container(
+                width: 100.0,
+                height: 100.0,
+              ),
+              new Positioned(
+                top: 0.0,
+                left: 0.0,
+                child: new Container(
+                  width: 200.0,
+                  height: 200.0,
+                ),
+              ),
+            ],
+          ),
+        ),
+      ),
     );
 
     box = tester.renderObject(find.byType(Stack));
@@ -347,23 +470,26 @@ void main() {
   testWidgets('Stack sizing: default', (WidgetTester tester) async {
     final List<String> logs = <String>[];
     await tester.pumpWidget(
-      new Center(
-        child: new ConstrainedBox(
-          constraints: const BoxConstraints(
-            minWidth: 2.0,
-            maxWidth: 3.0,
-            minHeight: 5.0,
-            maxHeight: 7.0,
-          ),
-          child: new Stack(
-            children: <Widget>[
-              new LayoutBuilder(
-                builder: (BuildContext context, BoxConstraints constraints) {
-                  logs.add(constraints.toString());
-                  return const Placeholder();
-                },
-              ),
-            ],
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Center(
+          child: new ConstrainedBox(
+            constraints: const BoxConstraints(
+              minWidth: 2.0,
+              maxWidth: 3.0,
+              minHeight: 5.0,
+              maxHeight: 7.0,
+            ),
+            child: new Stack(
+              children: <Widget>[
+                new LayoutBuilder(
+                  builder: (BuildContext context, BoxConstraints constraints) {
+                    logs.add(constraints.toString());
+                    return const Placeholder();
+                  },
+                ),
+              ],
+            ),
           ),
         ),
       ),
@@ -374,24 +500,27 @@ void main() {
   testWidgets('Stack sizing: explicit', (WidgetTester tester) async {
     final List<String> logs = <String>[];
     Widget buildStack(StackFit sizing) {
-      return new Center(
-        child: new ConstrainedBox(
-          constraints: const BoxConstraints(
-            minWidth: 2.0,
-            maxWidth: 3.0,
-            minHeight: 5.0,
-            maxHeight: 7.0,
-          ),
-          child: new Stack(
-            fit: sizing,
-            children: <Widget>[
-              new LayoutBuilder(
-                builder: (BuildContext context, BoxConstraints constraints) {
-                  logs.add(constraints.toString());
-                  return const Placeholder();
-                },
-              ),
-            ],
+      return new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Center(
+          child: new ConstrainedBox(
+            constraints: const BoxConstraints(
+              minWidth: 2.0,
+              maxWidth: 3.0,
+              minHeight: 5.0,
+              maxHeight: 7.0,
+            ),
+            child: new Stack(
+              fit: sizing,
+              children: <Widget>[
+                new LayoutBuilder(
+                  builder: (BuildContext context, BoxConstraints constraints) {
+                    logs.add(constraints.toString());
+                    return const Placeholder();
+                  },
+                ),
+              ],
+            ),
           ),
         ),
       );
@@ -412,27 +541,37 @@ void main() {
 
   testWidgets('Positioned.directional control test', (WidgetTester tester) async {
     final Key key = new UniqueKey();
-    await tester.pumpWidget(new Stack(
-      children: <Widget>[
-        new Positioned.directional(
-          textDirection: TextDirection.rtl,
-          start: 50.0,
-          child: new Container(key: key, width: 75.0, height: 175.0),
+    await tester.pumpWidget(
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Stack(
+          children: <Widget>[
+            new Positioned.directional(
+              textDirection: TextDirection.rtl,
+              start: 50.0,
+              child: new Container(key: key, width: 75.0, height: 175.0),
+            ),
+          ],
         ),
-      ],
-    ));
+      ),
+    );
 
     expect(tester.getTopLeft(find.byKey(key)), const Offset(675.0, 0.0));
 
-    await tester.pumpWidget(new Stack(
-      children: <Widget>[
-        new Positioned.directional(
-          textDirection: TextDirection.ltr,
-          start: 50.0,
-          child: new Container(key: key, width: 75.0, height: 175.0),
+    await tester.pumpWidget(
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Stack(
+          children: <Widget>[
+            new Positioned.directional(
+              textDirection: TextDirection.ltr,
+              start: 50.0,
+              child: new Container(key: key, width: 75.0, height: 175.0),
+            ),
+          ],
         ),
-      ],
-    ));
+      ),
+    );
 
     expect(tester.getTopLeft(find.byKey(key)), const Offset(50.0, 0.0));
   });
diff --git a/packages/flutter/test/widgets/transform_test.dart b/packages/flutter/test/widgets/transform_test.dart
index 928b209005..59a8341594 100644
--- a/packages/flutter/test/widgets/transform_test.dart
+++ b/packages/flutter/test/widgets/transform_test.dart
@@ -13,38 +13,41 @@ void main() {
   testWidgets('Transform origin', (WidgetTester tester) async {
     bool didReceiveTap = false;
     await tester.pumpWidget(
-      new Stack(
-        children: <Widget>[
-          new Positioned(
-            top: 100.0,
-            left: 100.0,
-            child: new Container(
-              width: 100.0,
-              height: 100.0,
-              color: const Color(0xFF0000FF),
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Stack(
+          children: <Widget>[
+            new Positioned(
+              top: 100.0,
+              left: 100.0,
+              child: new Container(
+                width: 100.0,
+                height: 100.0,
+                color: const Color(0xFF0000FF),
+              ),
             ),
-          ),
-          new Positioned(
-            top: 100.0,
-            left: 100.0,
-            child: new Container(
-              width: 100.0,
-              height: 100.0,
-              child: new Transform(
-                transform: new Matrix4.diagonal3Values(0.5, 0.5, 1.0),
-                origin: const Offset(100.0, 50.0),
-                child: new GestureDetector(
-                  onTap: () {
-                    didReceiveTap = true;
-                  },
-                  child: new Container(
-                    color: const Color(0xFF00FFFF),
+            new Positioned(
+              top: 100.0,
+              left: 100.0,
+              child: new Container(
+                width: 100.0,
+                height: 100.0,
+                child: new Transform(
+                  transform: new Matrix4.diagonal3Values(0.5, 0.5, 1.0),
+                  origin: const Offset(100.0, 50.0),
+                  child: new GestureDetector(
+                    onTap: () {
+                      didReceiveTap = true;
+                    },
+                    child: new Container(
+                      color: const Color(0xFF00FFFF),
+                    ),
                   ),
                 ),
               ),
             ),
-          ),
-        ],
+          ],
+        ),
       ),
     );
 
@@ -58,38 +61,41 @@ void main() {
   testWidgets('Transform alignment', (WidgetTester tester) async {
     bool didReceiveTap = false;
     await tester.pumpWidget(
-      new Stack(
-        children: <Widget>[
-          new Positioned(
-            top: 100.0,
-            left: 100.0,
-            child: new Container(
-              width: 100.0,
-              height: 100.0,
-              color: const Color(0xFF0000FF),
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Stack(
+          children: <Widget>[
+            new Positioned(
+              top: 100.0,
+              left: 100.0,
+              child: new Container(
+                width: 100.0,
+                height: 100.0,
+                color: const Color(0xFF0000FF),
+              ),
             ),
-          ),
-          new Positioned(
-            top: 100.0,
-            left: 100.0,
-            child: new Container(
-              width: 100.0,
-              height: 100.0,
-              child: new Transform(
-                transform: new Matrix4.diagonal3Values(0.5, 0.5, 1.0),
-                alignment: const FractionalOffset(1.0, 0.5),
-                child: new GestureDetector(
-                  onTap: () {
-                    didReceiveTap = true;
-                  },
-                  child: new Container(
-                    color: const Color(0xFF00FFFF),
+            new Positioned(
+              top: 100.0,
+              left: 100.0,
+              child: new Container(
+                width: 100.0,
+                height: 100.0,
+                child: new Transform(
+                  transform: new Matrix4.diagonal3Values(0.5, 0.5, 1.0),
+                  alignment: const FractionalOffset(1.0, 0.5),
+                  child: new GestureDetector(
+                    onTap: () {
+                      didReceiveTap = true;
+                    },
+                    child: new Container(
+                      color: const Color(0xFF00FFFF),
+                    ),
                   ),
                 ),
               ),
             ),
-          ),
-        ],
+          ],
+        ),
       ),
     );
 
@@ -102,40 +108,45 @@ void main() {
 
   testWidgets('Transform offset + alignment', (WidgetTester tester) async {
     bool didReceiveTap = false;
-    await tester.pumpWidget(new Stack(
-      children: <Widget>[
-        new Positioned(
-          top: 100.0,
-          left: 100.0,
-          child: new Container(
-            width: 100.0,
-            height: 100.0,
-            color: const Color(0xFF0000FF),
-          ),
-        ),
-        new Positioned(
-          top: 100.0,
-          left: 100.0,
-          child: new Container(
-            width: 100.0,
-            height: 100.0,
-            child: new Transform(
-              transform: new Matrix4.diagonal3Values(0.5, 0.5, 1.0),
-              origin: const Offset(100.0, 0.0),
-              alignment: const FractionalOffset(0.0, 0.5),
-              child: new GestureDetector(
-                onTap: () {
-                  didReceiveTap = true;
-                },
-                child: new Container(
-                  color: const Color(0xFF00FFFF),
+    await tester.pumpWidget(
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new Stack(
+          children: <Widget>[
+            new Positioned(
+              top: 100.0,
+              left: 100.0,
+              child: new Container(
+                width: 100.0,
+                height: 100.0,
+                color: const Color(0xFF0000FF),
+              ),
+            ),
+            new Positioned(
+              top: 100.0,
+              left: 100.0,
+              child: new Container(
+                width: 100.0,
+                height: 100.0,
+                child: new Transform(
+                  transform: new Matrix4.diagonal3Values(0.5, 0.5, 1.0),
+                  origin: const Offset(100.0, 0.0),
+                  alignment: const FractionalOffset(0.0, 0.5),
+                  child: new GestureDetector(
+                    onTap: () {
+                      didReceiveTap = true;
+                    },
+                    child: new Container(
+                      color: const Color(0xFF00FFFF),
+                    ),
+                  ),
                 ),
               ),
             ),
-          ),
+          ],
         ),
-      ],
-    ));
+      ),
+    );
 
     expect(didReceiveTap, isFalse);
     await tester.tapAt(const Offset(110.0, 110.0));
diff --git a/packages/flutter/test/widgets/widget_inspector_test.dart b/packages/flutter/test/widgets/widget_inspector_test.dart
index 830772fb67..0e30ca6020 100644
--- a/packages/flutter/test/widgets/widget_inspector_test.dart
+++ b/packages/flutter/test/widgets/widget_inspector_test.dart
@@ -11,18 +11,8 @@ void main() {
   testWidgets('WidgetInspector smoke test', (WidgetTester tester) async {
     // This is a smoke test to verify that adding the inspector doesn't crash.
     await tester.pumpWidget(
-      new Stack(
-        children: <Widget>[
-          const Text('a', textDirection: TextDirection.ltr),
-          const Text('b', textDirection: TextDirection.ltr),
-          const Text('c', textDirection: TextDirection.ltr),
-        ],
-      ),
-    );
-
-    await tester.pumpWidget(
-      new WidgetInspector(
-        selectButtonBuilder: null,
+      new Directionality(
+        textDirection: TextDirection.ltr,
         child: new Stack(
           children: <Widget>[
             const Text('a', textDirection: TextDirection.ltr),
@@ -33,6 +23,22 @@ void main() {
       ),
     );
 
+    await tester.pumpWidget(
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new WidgetInspector(
+          selectButtonBuilder: null,
+          child: new Stack(
+            children: <Widget>[
+              const Text('a', textDirection: TextDirection.ltr),
+              const Text('b', textDirection: TextDirection.ltr),
+              const Text('c', textDirection: TextDirection.ltr),
+            ],
+          ),
+        ),
+      ),
+    );
+
     expect(true, isTrue); // Expect that we reach here without crashing.
   });
 
@@ -172,14 +178,17 @@ void main() {
     bool didLongPress = false;
 
     await tester.pumpWidget(
-      new WidgetInspector(
-        selectButtonBuilder: null,
-        child: new GestureDetector(
-          onLongPress: () {
-            expect(didLongPress, isFalse);
-            didLongPress = true;
-          },
-          child: const Text('target', textDirection: TextDirection.ltr),
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new WidgetInspector(
+          selectButtonBuilder: null,
+          child: new GestureDetector(
+            onLongPress: () {
+              expect(didLongPress, isFalse);
+              didLongPress = true;
+            },
+            child: const Text('target', textDirection: TextDirection.ltr),
+          ),
         ),
       ),
     );
@@ -208,27 +217,30 @@ void main() {
       );
     }
     await tester.pumpWidget(
-      new WidgetInspector(
-        key: inspectorKey,
-        selectButtonBuilder: null,
-        child: new Overlay(
-          initialEntries: <OverlayEntry>[
-            new OverlayEntry(
-              opaque: false,
-              maintainState: true,
-              builder: (BuildContext _) => createSubtree(width: 94.0),
-            ),
-            new OverlayEntry(
-              opaque: true,
-              maintainState: true,
-              builder: (BuildContext _) => createSubtree(width: 95.0),
-            ),
-            new OverlayEntry(
-              opaque: false,
-              maintainState: true,
-              builder: (BuildContext _) => createSubtree(width: 96.0, key: clickTarget),
-            ),
-          ],
+      new Directionality(
+        textDirection: TextDirection.ltr,
+        child: new WidgetInspector(
+          key: inspectorKey,
+          selectButtonBuilder: null,
+          child: new Overlay(
+            initialEntries: <OverlayEntry>[
+              new OverlayEntry(
+                opaque: false,
+                maintainState: true,
+                builder: (BuildContext _) => createSubtree(width: 94.0),
+              ),
+              new OverlayEntry(
+                opaque: true,
+                maintainState: true,
+                builder: (BuildContext _) => createSubtree(width: 95.0),
+              ),
+              new OverlayEntry(
+                opaque: false,
+                maintainState: true,
+                builder: (BuildContext _) => createSubtree(width: 96.0, key: clickTarget),
+              ),
+            ],
+          ),
         ),
       ),
     );