content: import 'package:flutter/material.dart';
  
  class AnimatedPageSplitter extends StatelessWidget {
    final Widget leftChild;
    final Widget? rightChild;
    final bool isExpanded;
    final Duration animationDuration;
    final double dividerWidth;
  
    const AnimatedPageSplitter({
      super.key,
      required this.leftChild,
      this.rightChild,
      this.isExpanded = false,
      this.animationDuration = const Duration(milliseconds: 250),
      this.dividerWidth = 16.0,
    });
  
    @override
    Widget build(BuildContext context) {
      return LayoutBuilder(
        builder: (context, constraints) {
          final screenWidth = constraints.maxWidth;
          final firstHalfWidth = (screenWidth - dividerWidth) / 2.7;
          final secondHalfWidth = screenWidth - firstHalfWidth;
  
          final leftSectionWidth = isExpanded ? firstHalfWidth : screenWidth;
          final rightSectionWidth = isExpanded ? secondHalfWidth : 0.0;
          final animatedDividerWidth = isExpanded ? dividerWidth : 0.0;
  
          return Row(
            children: [
              AnimatedContainer(
                duration: animationDuration,
                width: leftSectionWidth,
                child: leftChild,
              ),
              AnimatedContainer(
                duration: animationDuration,
                width: animatedDividerWidth,
                color: Colors.transparent,
                child: animatedDividerWidth > 0 ? const VerticalDivider() : null,
              ),
              Expanded(
                child: AnimatedContainer(
                  duration: animationDuration,
                  width: rightSectionWidth,
                  child: rightChild,
                ),
              ),
            ],
          );
        },
      );
    }
  }
  