Migrate sample code to NNBD (#72755)
diff --git a/packages/flutter/lib/src/cupertino/colors.dart b/packages/flutter/lib/src/cupertino/colors.dart
index 2710f8f..14db7cf 100644
--- a/packages/flutter/lib/src/cupertino/colors.dart
+++ b/packages/flutter/lib/src/cupertino/colors.dart
@@ -12,9 +12,8 @@
import 'theme.dart';
// Examples can assume:
-// // @dart = 2.9
-// Widget child;
-// BuildContext context;
+// late Widget child;
+// late BuildContext context;
/// A palette of [Color] constants that describe colors commonly used when
/// matching the iOS platform aesthetics.
diff --git a/packages/flutter/lib/src/cupertino/form_row.dart b/packages/flutter/lib/src/cupertino/form_row.dart
index fa612dc..fa94194 100644
--- a/packages/flutter/lib/src/cupertino/form_row.dart
+++ b/packages/flutter/lib/src/cupertino/form_row.dart
@@ -8,9 +8,6 @@
import 'colors.dart';
import 'theme.dart';
-// Examples can assume:
-// // @dart = 2.9
-
// Content padding determined via SwiftUI's `Form` view in the iOS 14.2 SDK.
const EdgeInsetsGeometry _kDefaultPadding =
EdgeInsetsDirectional.fromSTEB(20.0, 6.0, 6.0, 6.0);
@@ -45,7 +42,7 @@
///
/// ```dart
/// class FlutterDemo extends StatefulWidget {
-/// FlutterDemo({Key key}) : super(key: key);
+/// FlutterDemo({Key? key}) : super(key: key);
///
/// @override
/// _FlutterDemoState createState() => _FlutterDemoState();
diff --git a/packages/flutter/lib/src/cupertino/segmented_control.dart b/packages/flutter/lib/src/cupertino/segmented_control.dart
index d99d7bf..ceceeba 100644
--- a/packages/flutter/lib/src/cupertino/segmented_control.dart
+++ b/packages/flutter/lib/src/cupertino/segmented_control.dart
@@ -11,9 +11,6 @@
import 'theme.dart';
-// Examples can assume:
-// // @dart = 2.9
-
// Minimum padding from edges of the segmented control to edges of
// encompassing widget.
const EdgeInsetsGeometry _kHorizontalItemPadding = EdgeInsets.symmetric(horizontal: 16.0);
@@ -141,7 +138,7 @@
/// 1: Text('Child 2'),
/// };
///
- /// int currentValue;
+ /// late int currentValue;
///
/// @override
/// Widget build(BuildContext context) {
diff --git a/packages/flutter/lib/src/cupertino/text_field.dart b/packages/flutter/lib/src/cupertino/text_field.dart
index 49cfa7a..bb55c06 100644
--- a/packages/flutter/lib/src/cupertino/text_field.dart
+++ b/packages/flutter/lib/src/cupertino/text_field.dart
@@ -16,9 +16,6 @@
export 'package:flutter/services.dart' show TextInputType, TextInputAction, TextCapitalization, SmartQuotesType, SmartDashesType;
-// Examples can assume:
-// // @dart = 2.9
-
const TextStyle _kDefaultPlaceholderStyle = TextStyle(
fontWeight: FontWeight.w400,
color: CupertinoColors.placeholderText,
@@ -154,7 +151,7 @@
/// }
///
/// class _MyPrefilledTextState extends State<MyPrefilledText> {
-/// TextEditingController _textController;
+/// late TextEditingController _textController;
///
/// @override
/// void initState() {
diff --git a/packages/flutter/lib/src/physics/gravity_simulation.dart b/packages/flutter/lib/src/physics/gravity_simulation.dart
index 0688579..ac0629e 100644
--- a/packages/flutter/lib/src/physics/gravity_simulation.dart
+++ b/packages/flutter/lib/src/physics/gravity_simulation.dart
@@ -5,8 +5,7 @@
import 'simulation.dart';
// Examples can assume:
-// // @dart = 2.9
-// AnimationController _controller;
+// late AnimationController _controller;
/// A simulation that applies a constant accelerating force.
///
diff --git a/packages/flutter/lib/src/rendering/binding.dart b/packages/flutter/lib/src/rendering/binding.dart
index 3f9769f..0ef3916 100644
--- a/packages/flutter/lib/src/rendering/binding.dart
+++ b/packages/flutter/lib/src/rendering/binding.dart
@@ -20,7 +20,6 @@
export 'package:flutter/gestures.dart' show HitTestResult;
// Examples can assume:
-// // @dart = 2.9
// dynamic context;
/// The glue between the render tree and the Flutter engine.
@@ -221,7 +220,7 @@
/// Querying [PlatformDispatcher.platformBrightness].
///
/// ```dart
- /// final Brightness brightness = WidgetsBinding.instance.platformDispatcher.platformBrightness;
+ /// final Brightness brightness = WidgetsBinding.instance!.platformDispatcher.platformBrightness;
/// ```
/// {@end-tool}
///
diff --git a/packages/flutter/lib/src/rendering/box.dart b/packages/flutter/lib/src/rendering/box.dart
index 1c64eb0..e639cb4 100644
--- a/packages/flutter/lib/src/rendering/box.dart
+++ b/packages/flutter/lib/src/rendering/box.dart
@@ -13,9 +13,6 @@
import 'debug.dart';
import 'object.dart';
-// Examples can assume:
-// // @dart = 2.9
-
// This class should only be used in debug builds.
class _DebugSize extends Size {
_DebugSize(Size source, this._owner, this._canBeUsedByParent) : super.copy(source);
@@ -718,7 +715,7 @@
/// }
///
/// @override
- /// bool hitTestChildren(BoxHitTestResult result, { Offset position }) {
+ /// bool hitTestChildren(BoxHitTestResult result, { required Offset position }) {
/// return result.addWithPaintTransform(
/// transform: _effectiveTransform,
/// position: position,
diff --git a/packages/flutter/lib/src/rendering/debug_overflow_indicator.dart b/packages/flutter/lib/src/rendering/debug_overflow_indicator.dart
index 1a71771..59700ec 100644
--- a/packages/flutter/lib/src/rendering/debug_overflow_indicator.dart
+++ b/packages/flutter/lib/src/rendering/debug_overflow_indicator.dart
@@ -11,9 +11,6 @@
import 'object.dart';
import 'stack.dart';
-// Examples can assume:
-// // @dart = 2.9
-
// Describes which side the region data overflows on.
enum _OverflowSide {
left,
@@ -57,20 +54,20 @@
/// ```dart
/// class MyRenderObject extends RenderAligningShiftedBox with DebugOverflowIndicatorMixin {
/// MyRenderObject({
-/// AlignmentGeometry alignment,
-/// TextDirection textDirection,
-/// RenderBox child,
+/// AlignmentGeometry alignment = Alignment.center,
+/// TextDirection? textDirection,
+/// RenderBox? child,
/// }) : super.mixin(alignment, textDirection, child);
///
-/// Rect _containerRect;
-/// Rect _childRect;
+/// late Rect _containerRect;
+/// late Rect _childRect;
///
/// @override
/// void performLayout() {
/// // ...
-/// final BoxParentData childParentData = child.parentData;
+/// final BoxParentData childParentData = child!.parentData! as BoxParentData;
/// _containerRect = Offset.zero & size;
-/// _childRect = childParentData.offset & child.size;
+/// _childRect = childParentData.offset & child!.size;
/// }
///
/// @override
diff --git a/packages/flutter/lib/src/rendering/proxy_box.dart b/packages/flutter/lib/src/rendering/proxy_box.dart
index bed998d..acabe16 100644
--- a/packages/flutter/lib/src/rendering/proxy_box.dart
+++ b/packages/flutter/lib/src/rendering/proxy_box.dart
@@ -28,9 +28,6 @@
PointerUpEvent,
PointerCancelEvent;
-// Examples can assume:
-// // @dart = 2.9
-
/// A base class for render boxes that resemble their children.
///
/// A proxy box has a single child and simply mimics all the properties of that
@@ -3053,7 +3050,7 @@
///
/// ```dart
/// class PngHome extends StatefulWidget {
- /// PngHome({Key key}) : super(key: key);
+ /// PngHome({Key? key}) : super(key: key);
///
/// @override
/// _PngHomeState createState() => _PngHomeState();
@@ -3063,10 +3060,10 @@
/// GlobalKey globalKey = GlobalKey();
///
/// Future<void> _capturePng() async {
- /// RenderRepaintBoundary boundary = globalKey.currentContext.findRenderObject();
+ /// RenderRepaintBoundary boundary = globalKey.currentContext!.findRenderObject()! as RenderRepaintBoundary;
/// ui.Image image = await boundary.toImage();
- /// ByteData byteData = await image.toByteData(format: ui.ImageByteFormat.png);
- /// Uint8List pngBytes = byteData.buffer.asUint8List();
+ /// ByteData? byteData = await image.toByteData(format: ui.ImageByteFormat.png);
+ /// Uint8List pngBytes = byteData!.buffer.asUint8List();
/// print(pngBytes);
/// }
///
