type 'Null' is not a subtype of type 'double' in type cast

[offical-waqas-khurshid]

The following _TypeError was thrown building ConditionalRouteWidget(dirty, dependencies: [InheritedResponsiveBreakpoints, _ModalScopeStatus]):
type 'Null' is not a subtype of type 'double' in type cast

The relevant error-causing widget was:
ConditionalRouteWidget ConditionalRouteWidget:file:///C:/Users/waqas.khursheed/Desktop/FlutterMinimalWebsite/lib/main_advanced.dart:41:18
When the exception was thrown, this was the stack:
#0 new ResponsiveValue (package:responsive_framework/src/responsive_value.dart:47:61)
#1 MyApp.build... (package:minimal/main_advanced.dart:53:32)
#2 ConditionalRouteWidget.build (package:minimal/utils/conditional_route_widget.dart:26:21)
#3 StatelessElement.build (package:flutter/src/widgets/framework.dart:5550:49)
#4 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5480:15)
#5 Element.rebuild (package:flutter/src/widgets/framework.dart:5196:7)
#6 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:5462:5)
#7 ComponentElement.mount (package:flutter/src/widgets/framework.dart:5456:5)
... Normal element mounting (182 frames)
#189 Element.inflateWidget (package:flutter/src/widgets/framework.dart:4335:16)
#190 MultiChildRenderObjectElement.inflateWidget (package:flutter/src/widgets/framework.dart:6893:36)
#191 MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:6905:32)
... Normal element mounting (492 frames)
#683 Element.inflateWidget (package:flutter/src/widgets/framework.dart:4335:16)
#684 Element.updateChild (package:flutter/src/widgets/framework.dart:3846:18)
#685 _RawViewElement._updateChild (package:flutter/src/widgets/view.dart:291:16)
#686 _RawViewElement.mount (package:flutter/src/widgets/view.dart:314:5)
... Normal element mounting (7 frames)
#693 Element.inflateWidget (package:flutter/src/widgets/framework.dart:4335:16)
#694 Element.updateChild (package:flutter/src/widgets/framework.dart:3846:18)
#695 RootElement._rebuild (package:flutter/src/widgets/binding.dart:1354:16)
#696 RootElement.mount (package:flutter/src/widgets/binding.dart:1323:5)
#697 RootWidget.attach. (package:flutter/src/widgets/binding.dart:1276:18)
#698 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2844:19)
#699 RootWidget.attach (package:flutter/src/widgets/binding.dart:1275:13)
#700 WidgetsBinding.attachToBuildOwner (package:flutter/src/widgets/binding.dart:1088:27)
#701 WidgetsBinding.attachRootWidget (package:flutter/src/widgets/binding.dart:1070:5)
#702 WidgetsBinding.scheduleAttachRootWidget. (package:flutter/src/widgets/binding.dart:1056:7)
#706 _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:184:12)
(elided 3 frames from class _Timer and dart:async-patch)

[EkjyotSandhu12]

Yes facing the same issue
Right now i am using 1.1.1. Just to hide the error

[pstemporowski]

To ensure all scenarios are accounted for, including the one in the example where 'mobile' is specified along with two values, it would be necessary to set a default value. This adjustment will help cover cases that the current condition in your case misses.

[EkjyotSandhu12]

    return ResponsiveScaledBox(
      width: ResponsiveValue<double>(
        context,
        conditionalValues: [
          //Scale:- the application will scale and maintain ratio of designScreenWidth pixels in any resolution by scaling.
          Condition.largerThan(
            breakpoint: 0,
            value: ThemeConstants.designScreenWidth,
          ),
        ],
        defaultValue: 0,  // <-- ADD THIS
      ).value,
      child: ClampingScrollWrapper.builder(
        dragWithMouse: true,
        context,
        child,
      ),
    );

[rayliverified]

This was a tough call with a long history and limitations of Dart's type capabilities.
Making it non-nullable broke usages that require nullable values.

What's remaining is the confusion between typed null / <double?> non-nullable and the value's nullability.
Any suggestions?

[lpdevit]

This was a tough call with a long history and limitations of Dart's type capabilities.

Making it non-nullable broke usages that require nullable values.

What's remaining is the confusion between typed null / <double?> non-nullable and the value's nullability.

Any suggestions?

Hi, same problem here, any suggestions? Thank you for your great job!

[arifayduran]

Still waiting

[mervenurtopcu]

ResponsiveScaledBox( width: ResponsiveValue<double>(context, defaultValue: 450, conditionalValues: [ const Condition.equals(name: MOBILE, value: 450), const Condition.equals(name: TABLET, value: 600), const Condition.equals(name: DESKTOP, value: 1200), const Condition.equals(name: "4K", value: 2300), ]).value, child: child ?? SizedBox.shrink()),
Add 'defaultValue: 450'. It worked for me.