main_test_function_apply_issue.dart

main_test_function_apply_issue.dart

import 'package:flutter/material.dart';

void main() {
  runApp(const MaterialApp(
    home: Scaffold(
      body: Center(
        child: DemoWidget(),
      ),
    ),
  ));
}

class DemoWidget extends StatelessWidget {
  const DemoWidget({super.key});

  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        // 1) Direct usage with literal named parameters (#width, #height)
        createContainerWithDirectSymbols(),
        const SizedBox(height: 20),
        // 2) Using Function.apply with Symbol-based named parameters
        createContainerWithDynamicNamedParameters(),
      ],
    );
  }

  Widget createContainerWithDirectSymbols() {
    try {
      return Function.apply(
        Container.new,
        [],
        {
          #width: 150.0,
          #height: 50.0,
          #color: Colors.red,
        },
      ) as Widget;
    } catch (e) {
      return Text('Error: $e');
    }
  }

  Widget createContainerWithDynamicNamedParameters() {
    try {
      return Function.apply(
        Container.new,
        [],
        {
          Symbol('width'): 150.0,
          Symbol('height'): 50.0,
          Symbol('color'): Colors.red,
        },
      ) as Widget;
    } catch (e) {
      return Text('Error: $e');
    }
  }
}