Migrated package [guide] to null-safety (#65)

* reset and migrated package [rating] to null-safety.

* Migrated package [selectcity] to null-safety

* 修改ISuspensionBean抽象类相关子类的空字段问题。

* Migrated package [noticebar] to null-safety

* 1.Migrated package [radio] to null-safety;
2.Modified not-need-nullable param in brn_single_select_city_page.dart;

* Migrated package [guide] to null-safety

lib/src/components/guide/brn_delay_rendered_widget.dart

@@ -1,5 +1,3 @@
-// @dart=2.9
-
 part of brn_intro;
 
 /// 延时渲染一个 Widget
@@ -17,10 +15,10 @@ class _DelayRenderedWidget extends StatefulWidget {
   final bool removed;
 
   const _DelayRenderedWidget({
-    Key key,
+    Key? key,
     this.removed = false,
     this.duration = const Duration(milliseconds: 200),
-    this.child,
+    required this.child,
     this.childPersist = false,
   }) : super(key: key);
 
@@ -30,8 +28,8 @@ class _DelayRenderedWidget extends StatefulWidget {
 
 class _DelayRenderedWidgetState extends State<_DelayRenderedWidget> {
   double opacity = 0;
-  Widget child;
-  Timer timer;
+  late Widget child;
+  late Timer timer;
 
   /// Time interval between animations
   final Duration durationInterval = Duration(milliseconds: 100);
@@ -51,8 +49,8 @@ class _DelayRenderedWidgetState extends State<_DelayRenderedWidget> {
 
   @override
   void dispose() {
-    super.dispose();
     timer.cancel();
+    super.dispose();
   }
 
   @override

lib/src/components/guide/brn_flutter_guide.dart

@@ -1,5 +1,3 @@
-// @dart=2.9
-
 library brn_intro;
 
 import 'dart:async';
@@ -34,18 +32,18 @@ class BrnTipInfoBean {
 /// 支持 强引导：界面变灰，引导框高亮| 弱引导：直接在界面浮现提示框两种
 class BrnGuide {
   bool _removed = false;
-  double _widgetWidth;
-  double _widgetHeight;
-  Offset _widgetOffset;
-  OverlayEntry _overlayEntry;
+  late double _widgetWidth;
+  late double _widgetHeight;
+  late Offset _widgetOffset;
+  OverlayEntry? _overlayEntry;
   int _currentStepIndex = 0;
-  Widget _stepWidget;
+  late Widget _stepWidget;
   List<Map> _configMap = [];
   List<GlobalKey> _globalKeys = [];
   final Color _maskColor = Colors.black.withOpacity(.6);
   final Duration _animationDuration = Duration(milliseconds: 300);
   final _th = _Throttling(duration: Duration(milliseconds: 500));
-  Size _lastScreenSize;
+  late Size _lastScreenSize;
 
   /// 当前处于第几步
   int get currentStepIndex => _currentStepIndex;
@@ -63,15 +61,15 @@ class BrnGuide {
   final int stepCount;
 
   /// 每次点击的下一步的时候的回调
-  final void Function(int nextIndex) onNextClick;
+  final void Function(int nextIndex)? onNextClick;
 
   /// 引导交互的模式
   GuideMode introMode;
 
   BrnGuide(
-      {@required this.introMode,
-      @required this.widgetBuilder,
-      @required this.stepCount,
+      {required this.introMode,
+      required this.widgetBuilder,
+      required this.stepCount,
       this.borderRadius = const BorderRadius.all(Radius.circular(4)),
       this.padding = const EdgeInsets.all(10),
       this.onNextClick})
@@ -91,8 +89,8 @@ class BrnGuide {
   /// [borderRadius] BorderRadius setting
   void setStepConfig(
     int stepIndex, {
-    EdgeInsets padding,
-    BorderRadiusGeometry borderRadius,
+    EdgeInsets? padding,
+    BorderRadiusGeometry? borderRadius,
   }) {
     assert(stepIndex >= 0 && stepIndex < stepCount);
     _configMap[stepIndex] = {
@@ -108,8 +106,8 @@ class BrnGuide {
   /// [borderRadius] BorderRadius setting
   void setStepsConfig(
     List<int> stepsIndex, {
-    EdgeInsets padding,
-    BorderRadiusGeometry borderRadius,
+    EdgeInsets? padding,
+    BorderRadiusGeometry? borderRadius,
   }) {
     assert(stepsIndex
         .every((stepIndex) => stepIndex >= 0 && stepIndex < stepCount));
@@ -124,9 +122,9 @@ class BrnGuide {
 
   void _getWidgetInfo(GlobalKey globalKey) {
     try {
-      EdgeInsets currentConfig = _configMap[_currentStepIndex]['padding'];
-      RenderBox renderBox;
-      renderBox = globalKey.currentContext.findRenderObject();
+      EdgeInsets? currentConfig = _configMap[_currentStepIndex]['padding'];
+      RenderBox renderBox =
+          globalKey.currentContext?.findRenderObject() as RenderBox;
       _widgetWidth = renderBox.size.width +
           (currentConfig?.horizontal ?? padding.horizontal);
       _widgetHeight =
@@ -141,20 +139,20 @@ class BrnGuide {
       _widgetWidth = 0;
       _widgetHeight = 0;
       _widgetOffset = Offset.zero;
-      debugPrint('获取组件尺寸信息异常');
+      debugPrint('获取组件尺寸信息异常${e.toString()}');
     }
   }
 
   Widget _maskBuilder({
-    double width,
-    double height,
-    BlendMode backgroundBlendMode,
-    @required double left,
-    @required double top,
-    double bottom,
-    double right,
-    BorderRadiusGeometry borderRadiusGeometry,
-    Widget child,
+    double? width,
+    double? height,
+    BlendMode? backgroundBlendMode,
+    required double left,
+    required double top,
+    double? bottom,
+    double? right,
+    BorderRadiusGeometry? borderRadiusGeometry,
+    Widget? child,
   }) {
     final decoration = BoxDecoration(
       color: Colors.white,
@@ -191,7 +189,7 @@ class BrnGuide {
           _lastScreenSize = screenSize;
           _th.throttle(() {
             _createStepWidget(context);
-            _overlayEntry.markNeedsBuild();
+            _overlayEntry?.markNeedsBuild();
           });
         }
 
@@ -241,14 +239,14 @@ class BrnGuide {
         );
       },
     );
-    Overlay.of(context).insert(_overlayEntry);
+    Overlay.of(context)?.insert(_overlayEntry!);
   }
 
   void _onNext(BuildContext context) {
     _currentStepIndex++;
     if (_currentStepIndex < stepCount) {
       if (onNextClick != null) {
-        onNextClick(currentStepIndex);
+        onNextClick!(currentStepIndex);
       }
       _renderStep(context);
     }
@@ -257,9 +255,9 @@ class BrnGuide {
   void _onFinish() {
     if (_overlayEntry == null) return;
     _removed = true;
-    _overlayEntry.markNeedsBuild();
+    _overlayEntry!.markNeedsBuild();
     Timer(_animationDuration, () {
-      _overlayEntry.remove();
+      _overlayEntry?.remove();
       _overlayEntry = null;
     });
   }
@@ -274,12 +272,8 @@ class BrnGuide {
       screenSize: screenSize,
       size: widgetSize,
       onNext: _currentStepIndex == stepCount - 1
-          ? () {
-              _onFinish();
-            }
-          : () {
-              _onNext(context);
-            },
+          ? () => _onFinish()
+          : () => _onNext(context),
       offset: _widgetOffset,
       currentStepIndex: _currentStepIndex,
       stepCount: stepCount,
@@ -289,7 +283,7 @@ class BrnGuide {
 
   void _renderStep(BuildContext context) {
     _createStepWidget(context);
-    if (_overlayEntry != null) _overlayEntry.markNeedsBuild();
+    _overlayEntry?.markNeedsBuild();
   }
 
   /// 触发引导操作 [context]当前环境[BuildContext]的启动方法

lib/src/components/guide/brn_pulse_widget.dart

@@ -1,5 +1,3 @@
-// @dart=2.9
-
 import 'package:bruno/src/theme/brn_theme_configurator.dart';
 import 'package:flutter/material.dart';
 
@@ -8,17 +6,18 @@ class PulseWidget extends StatefulWidget {
   final double width;
   final double height;
 
-  const PulseWidget({Key key, this.width, this.height}) : super(key: key);
+  const PulseWidget({Key? key, required this.width, required this.height})
+      : super(key: key);
 
   @override
   _PulseWidgetState createState() => _PulseWidgetState();
 }
 
 class _PulseWidgetState extends State<PulseWidget>
     with TickerProviderStateMixin {
-  AnimationController _scaleController;
-  AnimationController _fadeController;
-  Animation _alphaAnimation;
+  late AnimationController _scaleController;
+  late AnimationController _fadeController;
+  late Animation<double> _alphaAnimation;
 
   @override
   void initState() {

lib/src/components/guide/brn_step_widget_builder.dart

@@ -1,5 +1,3 @@
-// @dart=2.9
-
 part of brn_intro;
 
 /// 引导组件所处的方位
@@ -8,7 +6,10 @@ enum GuideDirection { left, right, topLeft, bottomLeft, topRight, bottomRight }
 /// 单步引导组件
 class StepWidgetBuilder {
   static Map _smartGetPosition(
-      {Size size, Size screenSize, Offset offset, GuideMode introMode}) {
+      {required Size size,
+      required Size screenSize,
+      required Offset offset,
+      required GuideMode introMode}) {
     double height = size.height;
     double width = size.width;
     double screenWidth = screenSize.width;
@@ -166,8 +167,8 @@ class StepWidgetBuilder {
   //showSkipLabel表示是否展示跳过按钮
   //showClose表示是否展示关闭按钮
   static Widget Function(StepWidgetParams params) useDefaultTheme(
-      {@required List<BrnTipInfoBean> tipInfo,
-      String Function(int currentStepIndex, int stepCount) buttonTextBuilder,
+      {required List<BrnTipInfoBean> tipInfo,
+      String Function(int currentStepIndex, int stepCount)? buttonTextBuilder,
       bool showStepLabel = true,
       bool showSkipLabel = true,
       bool showClose = true}) {

lib/src/components/guide/brn_step_widget_params.dart

@@ -1,24 +1,22 @@
-// @dart=2.9
-
 part of brn_intro;
 
 /// Highlight component parameters
 class WidgetParams {
   /// Padding of highlighted area
-  EdgeInsets padding;
+  EdgeInsets? padding;
 
   /// Border radius of the highlighted area
-  BorderRadiusGeometry borderRadius;
+  BorderRadiusGeometry? borderRadius;
 }
 
 /// The data passed in when the system calls [GuideStep.widgetBuilder] when the guide page is generated
 ///
 class StepWidgetParams {
   /// Enter the next guide page method, or null if there is no
-  final VoidCallback onNext;
+  final VoidCallback? onNext;
 
   /// End all guide page methods
-  final VoidCallback onFinish;
+  final VoidCallback? onFinish;
 
   /// Which guide page is currently displayed, starting from 0
   final int currentStepIndex;
@@ -37,14 +35,14 @@ class StepWidgetParams {
   final GuideMode introMode;
 
   StepWidgetParams({
-    this.introMode,
+    required this.introMode,
     this.onNext,
     this.onFinish,
-    @required this.screenSize,
-    @required this.size,
-    @required this.currentStepIndex,
-    @required this.stepCount,
-    @required this.offset,
+    required this.screenSize,
+    required this.size,
+    required this.currentStepIndex,
+    required this.stepCount,
+    required this.offset,
   });
 
   @override

lib/src/components/guide/brn_throttling.dart

@@ -1,15 +1,13 @@
-// @dart=2.9
-
 part of brn_intro;
 
 ///  Throttling
 ///  Have method [throttle]
 class _Throttling {
-  Duration _duration;
-  Timer _timer;
+  late Duration _duration;
+  Timer? _timer;
 
   _Throttling({Duration duration = const Duration(seconds: 1)})
-      : assert(duration is Duration && !duration.isNegative) {
+      : assert(!duration.isNegative) {
     _duration = duration;
   }