[rename fixit] *OneChild* -> *SingleChild*

Fixes #1482

examples/layers/widgets/custom_render_box.dart

@@ -35,7 +35,7 @@ class RenderDots extends RenderConstrainedBox {
   }
 }
 
-class Dots extends OneChildRenderObjectWidget {
+class Dots extends SingleChildRenderObjectWidget {
   Dots({ Key key, Widget child }) : super(key: key, child: child);
   RenderDots createRenderObject(BuildContext context) => new RenderDots();
 }

packages/flutter/lib/src/material/bottom_sheet.dart

@@ -94,7 +94,7 @@ class _BottomSheetState extends State<BottomSheet> {
 
 // MODAL BOTTOM SHEETS
 
-class _ModalBottomSheetLayout extends OneChildLayoutDelegate {
+class _ModalBottomSheetLayout extends SingleChildLayoutDelegate {
   _ModalBottomSheetLayout(this.progress);
 
   final double progress;
@@ -133,7 +133,7 @@ class _ModalBottomSheetState<T> extends State<_ModalBottomSheet<T>> {
         animation: config.route.animation,
         builder: (BuildContext context, Widget child) {
           return new ClipRect(
-            child: new CustomOneChildLayout(
+            child: new CustomSingleChildLayout(
               delegate: new _ModalBottomSheetLayout(config.route.animation.value),
               child: new BottomSheet(
                 animationController: config.route.animation,

packages/flutter/lib/src/material/material.dart

@@ -274,7 +274,7 @@ class RenderInkFeatures extends RenderProxyBox implements MaterialInkController
   }
 }
 
-class InkFeatures extends OneChildRenderObjectWidget {
+class InkFeatures extends SingleChildRenderObjectWidget {
   InkFeatures({ Key key, this.color, Widget child }) : super(key: key, child: child);
 
   final Color color;

packages/flutter/lib/src/material/popup_menu.dart

@@ -233,7 +233,7 @@ class _PopupMenu<T> extends StatelessComponent {
   }
 }
 
-class _PopupMenuRouteLayout extends OneChildLayoutDelegate {
+class _PopupMenuRouteLayout extends SingleChildLayoutDelegate {
   _PopupMenuRouteLayout(this.position, this.selectedItemOffset);
 
   final ModalPosition position;
@@ -316,7 +316,7 @@ class _PopupMenuRoute<T> extends PopupRoute<T> {
     final Size screenSize = MediaQuery.of(context).size;
     return new ConstrainedBox(
       constraints: new BoxConstraints(maxWidth: screenSize.width, maxHeight: screenSize.height),
-      child: new CustomOneChildLayout(
+      child: new CustomSingleChildLayout(
         delegate: new _PopupMenuRouteLayout(position, selectedItemOffset),
         child: new _PopupMenu<T>(route: this)
       )

packages/flutter/lib/src/material/tooltip.dart

@@ -189,7 +189,7 @@ class _TooltipState extends State<Tooltip> {
   }
 }
 
-class _TooltipPositionDelegate extends OneChildLayoutDelegate {
+class _TooltipPositionDelegate extends SingleChildLayoutDelegate {
   _TooltipPositionDelegate({
     this.target,
     this.verticalOffset,
@@ -271,7 +271,7 @@ class _TooltipOverlay extends StatelessComponent {
       right: 0.0,
       bottom: 0.0,
       child: new IgnorePointer(
-        child: new CustomOneChildLayout(
+        child: new CustomSingleChildLayout(
           delegate: new _TooltipPositionDelegate(
             target: target,
             verticalOffset: verticalOffset,

packages/flutter/lib/src/rendering/custom_layout.dart

@@ -5,7 +5,7 @@
 import 'box.dart';
 import 'object.dart';
 
-// For OneChildLayoutDelegate and RenderCustomOneChildLayoutBox, see shifted_box.dart
+// For SingleChildLayoutDelegate and RenderCustomSingleChildLayoutBox, see shifted_box.dart
 
 /// [ParentData] used by [RenderCustomMultiChildLayoutBox].
 class MultiChildLayoutParentData extends ContainerBoxParentDataMixin<RenderBox> {

packages/flutter/lib/src/rendering/shifted_box.dart

@@ -506,7 +506,7 @@ class RenderOverflowBox extends RenderShiftedBox {
 }
 
 /// A delegate for computing the layout of a render object with a single child.
-class OneChildLayoutDelegate {
+class SingleChildLayoutDelegate {
   /// Returns the size of this object given the incoming constraints.
   Size getSize(BoxConstraints constraints) => constraints.biggest;
 
@@ -517,7 +517,7 @@ class OneChildLayoutDelegate {
   Offset getPositionForChild(Size size, Size childSize) => Offset.zero;
 
   /// Override this method to return true when the child needs to be laid out.
-  bool shouldRelayout(OneChildLayoutDelegate oldDelegate) => true;
+  bool shouldRelayout(SingleChildLayoutDelegate oldDelegate) => true;
 }
 
 /// Defers the layout of its single child to a delegate.
@@ -526,18 +526,18 @@ class OneChildLayoutDelegate {
 /// decide where to position the child. The delegate can also determine the size
 /// of the parent, but the size of the parent cannot depend on the size of the
 /// child.
-class RenderCustomOneChildLayoutBox extends RenderShiftedBox {
-  RenderCustomOneChildLayoutBox({
+class RenderCustomSingleChildLayoutBox extends RenderShiftedBox {
+  RenderCustomSingleChildLayoutBox({
     RenderBox child,
-    OneChildLayoutDelegate delegate
+    SingleChildLayoutDelegate delegate
   }) : _delegate = delegate, super(child) {
     assert(delegate != null);
   }
 
   /// A delegate that controls this object's layout.
-  OneChildLayoutDelegate get delegate => _delegate;
-  OneChildLayoutDelegate _delegate;
-  void set delegate (OneChildLayoutDelegate newDelegate) {
+  SingleChildLayoutDelegate get delegate => _delegate;
+  SingleChildLayoutDelegate _delegate;
+  void set delegate (SingleChildLayoutDelegate newDelegate) {
     assert(newDelegate != null);
     if (_delegate == newDelegate)
       return;

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

@@ -506,12 +506,12 @@ abstract class LeafRenderObjectWidget extends RenderObjectWidget {
 /// A superclass for RenderObjectWidgets that configure RenderObject subclasses
 /// that have a single child slot. (This superclass only provides the storage
 /// for that child, it doesn't actually provide the updating logic.)
-abstract class OneChildRenderObjectWidget extends RenderObjectWidget {
-  const OneChildRenderObjectWidget({ Key key, this.child }) : super(key: key);
+abstract class SingleChildRenderObjectWidget extends RenderObjectWidget {
+  const SingleChildRenderObjectWidget({ Key key, this.child }) : super(key: key);
 
   final Widget child;
 
-  OneChildRenderObjectElement createElement() => new OneChildRenderObjectElement(this);
+  SingleChildRenderObjectElement createElement() => new SingleChildRenderObjectElement(this);
 }
 
 /// A superclass for RenderObjectWidgets that configure RenderObject subclasses
@@ -1772,10 +1772,10 @@ class LeafRenderObjectElement extends RenderObjectElement {
 }
 
 /// Instantiation of RenderObjectWidgets that have up to one child
-class OneChildRenderObjectElement extends RenderObjectElement {
-  OneChildRenderObjectElement(OneChildRenderObjectWidget widget) : super(widget);
+class SingleChildRenderObjectElement extends RenderObjectElement {
+  SingleChildRenderObjectElement(SingleChildRenderObjectWidget widget) : super(widget);
 
-  OneChildRenderObjectWidget get widget => super.widget;
+  SingleChildRenderObjectWidget get widget => super.widget;
 
   Element _child;
 
@@ -1796,7 +1796,7 @@ class OneChildRenderObjectElement extends RenderObjectElement {
     _child = updateChild(_child, widget.child, null);
   }
 
-  void update(OneChildRenderObjectWidget newWidget) {
+  void update(SingleChildRenderObjectWidget newWidget) {
     super.update(newWidget);
     assert(widget == newWidget);
     _child = updateChild(_child, widget.child, null);

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

@@ -375,7 +375,7 @@ class RawGestureDetectorState extends State<RawGestureDetector> {
   }
 }
 
-class _GestureSemantics extends OneChildRenderObjectWidget {
+class _GestureSemantics extends SingleChildRenderObjectWidget {
   _GestureSemantics({
     Key key,
     Widget child,

packages/flutter/test/widget/custom_one_child_layout_test.dart

@@ -7,7 +7,7 @@ import 'package:flutter/rendering.dart';
 import 'package:flutter/widgets.dart';
 import 'package:test/test.dart';
 
-class TestOneChildLayoutDelegate extends OneChildLayoutDelegate {
+class TestSingleChildLayoutDelegate extends SingleChildLayoutDelegate {
   BoxConstraints constraintsFromGetSize;
   BoxConstraints constraintsFromGetConstraintsForChild;
   Size sizeFromGetPositionForChild;
@@ -46,14 +46,14 @@ class TestOneChildLayoutDelegate extends OneChildLayoutDelegate {
   }
 }
 
-Widget buildFrame(OneChildLayoutDelegate delegate) {
-  return new Center(child: new CustomOneChildLayout(delegate: delegate, child: new Container()));
+Widget buildFrame(SingleChildLayoutDelegate delegate) {
+  return new Center(child: new CustomSingleChildLayout(delegate: delegate, child: new Container()));
 }
 
 void main() {
-  test('Control test for CustomOneChildLayout', () {
+  test('Control test for CustomSingleChildLayout', () {
     testWidgets((WidgetTester tester) {
-      TestOneChildLayoutDelegate delegate = new TestOneChildLayoutDelegate();
+      TestSingleChildLayoutDelegate delegate = new TestSingleChildLayoutDelegate();
       tester.pumpWidget(buildFrame(delegate));
 
       expect(delegate.constraintsFromGetSize.minWidth, 0.0);
@@ -74,9 +74,9 @@ void main() {
     });
   });
 
-  test('Test OneChildDelegate shouldRelayout method', () {
+  test('Test SingleChildDelegate shouldRelayout method', () {
     testWidgets((WidgetTester tester) {
-      TestOneChildLayoutDelegate delegate = new TestOneChildLayoutDelegate();
+      TestSingleChildLayoutDelegate delegate = new TestSingleChildLayoutDelegate();
       tester.pumpWidget(buildFrame(delegate));
 
       // Layout happened because the delegate was set.
@@ -84,14 +84,14 @@ void main() {
       expect(delegate.shouldRelayoutCalled, isFalse);
 
       // Layout did not happen because shouldRelayout() returned false.
-      delegate = new TestOneChildLayoutDelegate();
+      delegate = new TestSingleChildLayoutDelegate();
       delegate.shouldRelayoutValue = false;
       tester.pumpWidget(buildFrame(delegate));
       expect(delegate.shouldRelayoutCalled, isTrue);
       expect(delegate.constraintsFromGetConstraintsForChild, isNull);
 
       // Layout happened because shouldRelayout() returned true.
-      delegate = new TestOneChildLayoutDelegate();
+      delegate = new TestSingleChildLayoutDelegate();
       delegate.shouldRelayoutValue = true;
       tester.pumpWidget(buildFrame(delegate));
       expect(delegate.shouldRelayoutCalled, isTrue);

packages/flutter/test/widget/render_object_widget_test.dart

@@ -21,8 +21,8 @@ void main() {
   test('RenderObjectWidget smoke test', () {
     testWidgets((WidgetTester tester) {
       tester.pumpWidget(new DecoratedBox(decoration: kBoxDecorationA));
-      OneChildRenderObjectElement element =
-          tester.findElement((Element element) => element is OneChildRenderObjectElement);
+      SingleChildRenderObjectElement element =
+          tester.findElement((Element element) => element is SingleChildRenderObjectElement);
       expect(element, isNotNull);
       expect(element.renderObject is RenderDecoratedBox, isTrue);
       RenderDecoratedBox renderObject = element.renderObject;
@@ -30,7 +30,7 @@ void main() {
       expect(renderObject.position, equals(DecorationPosition.background));
 
       tester.pumpWidget(new DecoratedBox(decoration: kBoxDecorationB));
-      element = tester.findElement((Element element) => element is OneChildRenderObjectElement);
+      element = tester.findElement((Element element) => element is SingleChildRenderObjectElement);
       expect(element, isNotNull);
       expect(element.renderObject is RenderDecoratedBox, isTrue);
       renderObject = element.renderObject;
@@ -43,8 +43,8 @@ void main() {
     testWidgets((WidgetTester tester) {
 
       void checkFullTree() {
-        OneChildRenderObjectElement element =
-            tester.findElement((Element element) => element is OneChildRenderObjectElement);
+        SingleChildRenderObjectElement element =
+            tester.findElement((Element element) => element is SingleChildRenderObjectElement);
         expect(element, isNotNull);
         expect(element.renderObject is RenderDecoratedBox, isTrue);
         RenderDecoratedBox renderObject = element.renderObject;
@@ -59,8 +59,8 @@ void main() {
       }
 
       void childBareTree() {
-        OneChildRenderObjectElement element =
-            tester.findElement((Element element) => element is OneChildRenderObjectElement);
+        SingleChildRenderObjectElement element =
+            tester.findElement((Element element) => element is SingleChildRenderObjectElement);
         expect(element, isNotNull);
         expect(element.renderObject is RenderDecoratedBox, isTrue);
         RenderDecoratedBox renderObject = element.renderObject;
@@ -138,8 +138,8 @@ void main() {
         )
       ));
 
-      OneChildRenderObjectElement element =
-          tester.findElement((Element element) => element is OneChildRenderObjectElement);
+      SingleChildRenderObjectElement element =
+          tester.findElement((Element element) => element is SingleChildRenderObjectElement);
       expect(element.renderObject is RenderDecoratedBox, isTrue);
       RenderDecoratedBox parent = element.renderObject;
       expect(parent.child is RenderDecoratedBox, isTrue);
@@ -155,7 +155,7 @@ void main() {
       ));
 
       element =
-          tester.findElement((Element element) => element is OneChildRenderObjectElement);
+          tester.findElement((Element element) => element is SingleChildRenderObjectElement);
       expect(element.renderObject is RenderDecoratedBox, isTrue);
       expect(element.renderObject, equals(parent));
       expect(parent.child, isNull);

packages/flutter/test/widget/stateful_component_test.dart

@@ -14,8 +14,8 @@ void main() {
     testWidgets((WidgetTester tester) {
 
       void checkTree(BoxDecoration expectedDecoration) {
-        OneChildRenderObjectElement element =
-            tester.findElement((Element element) => element is OneChildRenderObjectElement);
+        SingleChildRenderObjectElement element =
+            tester.findElement((Element element) => element is SingleChildRenderObjectElement);
         expect(element, isNotNull);
         expect(element.renderObject is RenderDecoratedBox, isTrue);
         RenderDecoratedBox renderObject = element.renderObject;

packages/flutter_sprites/lib/src/sprite_widget.dart

 part of flutter_sprites;
 
 /// A widget that uses a [SpriteBox] to render a sprite node tree to the screen.
-class SpriteWidget extends OneChildRenderObjectWidget {
+class SpriteWidget extends SingleChildRenderObjectWidget {
 
   /// The rootNode of the sprite node tree.
   ///