Widget build()

in packages/google_maps_flutter/google_maps_flutter/example/lib/place_polyline.dart [203:307]
103 lines of code
15 McCabe index (conditional complexity)

  Widget build(BuildContext context) {
    final bool isIOS = !kIsWeb && defaultTargetPlatform == TargetPlatform.iOS;

    final PolylineId? selectedId = selectedPolyline;

    return Column(
      mainAxisAlignment: MainAxisAlignment.spaceEvenly,
      crossAxisAlignment: CrossAxisAlignment.stretch,
      children: <Widget>[
        Center(
          child: SizedBox(
            width: 350.0,
            height: 300.0,
            child: GoogleMap(
              initialCameraPosition: const CameraPosition(
                target: LatLng(53.1721, -3.5402),
                zoom: 7.0,
              ),
              polylines: Set<Polyline>.of(polylines.values),
              onMapCreated: _onMapCreated,
            ),
          ),
        ),
        Expanded(
          child: SingleChildScrollView(
            child: Row(
              mainAxisAlignment: MainAxisAlignment.spaceEvenly,
              children: <Widget>[
                Row(
                  children: <Widget>[
                    Column(
                      children: <Widget>[
                        TextButton(
                          child: const Text('add'),
                          onPressed: _add,
                        ),
                        TextButton(
                          child: const Text('remove'),
                          onPressed: (selectedId == null)
                              ? null
                              : () => _remove(selectedId),
                        ),
                        TextButton(
                          child: const Text('toggle visible'),
                          onPressed: (selectedId == null)
                              ? null
                              : () => _toggleVisible(selectedId),
                        ),
                        TextButton(
                          child: const Text('toggle geodesic'),
                          onPressed: (selectedId == null)
                              ? null
                              : () => _toggleGeodesic(selectedId),
                        ),
                      ],
                    ),
                    Column(
                      children: <Widget>[
                        TextButton(
                          child: const Text('change width'),
                          onPressed: (selectedId == null)
                              ? null
                              : () => _changeWidth(selectedId),
                        ),
                        TextButton(
                          child: const Text('change color'),
                          onPressed: (selectedId == null)
                              ? null
                              : () => _changeColor(selectedId),
                        ),
                        TextButton(
                          child: const Text('change start cap [Android only]'),
                          onPressed: isIOS || (selectedId == null)
                              ? null
                              : () => _changeStartCap(selectedId),
                        ),
                        TextButton(
                          child: const Text('change end cap [Android only]'),
                          onPressed: isIOS || (selectedId == null)
                              ? null
                              : () => _changeEndCap(selectedId),
                        ),
                        TextButton(
                          child: const Text('change joint type [Android only]'),
                          onPressed: isIOS || (selectedId == null)
                              ? null
                              : () => _changeJointType(selectedId),
                        ),
                        TextButton(
                          child: const Text('change pattern [Android only]'),
                          onPressed: isIOS || (selectedId == null)
                              ? null
                              : () => _changePattern(selectedId),
                        ),
                      ],
                    )
                  ],
                )
              ],
            ),
          ),
        ),
      ],
    );
  }