trackoffical_app/lib/widget/transparent_pointer.dart

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) => MaterialApp(
    home: Stack(
      fit: StackFit.expand,
      children: [
        GestureDetector(
          onDoubleTap: () => print("double red"),
          child: Container(color: Colors.red),
        ),
        TransparentPointer(
          transparent: true,
          child: Stack(
            children: [
              Positioned(
                top: 100,
                left: 100,
                right: 100,
                bottom: 100,
                child: GestureDetector(
                  onTap: () => print("green"),
                  child: Container(color: Colors.green),
                ),
              )
            ],
          ),
        ),
      ],
    ),
  );
}

class TransparentPointer extends SingleChildRenderObjectWidget {
  const TransparentPointer({
    super. key,
    this.transparent = true,
    super.child,
  })  : assert(transparent != null);


  final bool transparent;

  @override
  RenderTransparentPointer createRenderObject(BuildContext context) {
    return RenderTransparentPointer(
      transparent: transparent,
    );
  }

  @override
  void updateRenderObject(BuildContext context, RenderTransparentPointer renderObject) {
    renderObject
      ..transparent = transparent;
  }

  @override
  void debugFillProperties(DiagnosticPropertiesBuilder properties) {
    super.debugFillProperties(properties);
    properties.add(DiagnosticsProperty<bool>('transparent', transparent));
  }
}

class RenderTransparentPointer extends RenderProxyBox {
  RenderTransparentPointer({
    RenderBox? child,
    bool transparent = true,
  })  : _transparent = transparent,
        super(child) {
    assert(_transparent != null);
  }

  bool get transparent => _transparent;
  bool _transparent;

  set transparent(bool value) {
    assert(value != null);
    if (value == _transparent) return;
    _transparent = value;
  }

  @override
  bool hitTest(BoxHitTestResult result, {required Offset position}) {
    // forward hits to our child:
    final hit = super.hitTest(result, position: position);
    // but report to our parent that we are not hit when `transparent` is true:
    return !transparent && hit;
  }

  @override
  void debugFillProperties(DiagnosticPropertiesBuilder properties) {
    super.debugFillProperties(properties);
    properties.add(DiagnosticsProperty<bool>('transparent', transparent));
  }
}