Having issues cropping a widget with out an image

[frankjoshua]

All I get is a blank screen. Here is a minimal example.

`
import 'package:crop/crop.dart';
import 'package:flutter/material.dart';

class CropView extends StatelessWidget {

final controller = CropController(aspectRatio: 1 / 1);

@OverRide
Widget build(BuildContext context) {
return Crop(
controller: controller,
child: Container(width: double.infinity, height: double.infinity, color: Colors.purple,),
);
}
}
`

If instead of a container I use an image then it works fine but I need to crop widgets. That's why I chose this library.

======== Exception caught by rendering library =====================================================
I/flutter (27268): The following assertion was thrown while executing callbacks for
The following assertion was thrown during paint():
RenderBox was not laid out: RenderRepaintBoundary#a514d NEEDS-PAINT
'package:flutter/src/rendering/box.dart':
Failed assertion: line 2165 pos 12: 'hasSize'

The relevant error-causing widget was:
I/flutter (27268): FrameTiming:
CropRenderObjectWidget CropRenderObjectWidget:file:///home/josh/.pub-cache/hosted/pub.dev/crop-0.5.5/lib/src/crop.dart:346:7
When the exception was thrown, this was the stack:
#2 RenderBox.size (package:flutter/src/rendering/box.dart:2165:12)
#3 RenderBox.paintBounds (package:flutter/src/rendering/box.dart:2903:41)
I/flutter (27268): 'package:flutter/src/widgets/binding.dart': Failed assertion:
#4 PaintingContext._repaintCompositedChild (package:flutter/src/rendering/object.dart:165:56)
#5 PaintingContext.repaintCompositedChild (package:flutter/src/rendering/object.dart:109:5)
#6 PaintingContext._compositeChild (package:flutter/src/rendering/object.dart:261:7)
#7 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:242:7)
#8 RenderCrop.paint (package:crop/src/crop_render.dart:87:15)
#9 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3239:7)
#10 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250:13)
#11 RenderBoxContainerDefaultsMixin.defaultPaint (package:flutter/src/rendering/box.dart:3158:15)