Is it possible to update the cropping area by keyboard instead of drag?

[sunwindjingfeng]

Currently while the user drag the image, it will change the cropped area, and when the drag stopped, it will emitCroppedData and finalize the change. But if we want to make it more accessible but providing the user ability to change the crop position by keyboard, how can we ensure the cropper will compute the cropped data properly again?

[ValentinH]

Funnily, an issue about this was opened yesterday: #586