crop_your_image

A flutter plugin which provides Crop Widget for cropping images.

crop_your_image provides only minimum UI for deciding cropping area inside images. Other UI parts, such as “Crop” button or “Change Aspect Ratio” button, need to be prepared by each app developers.

This policy helps app developers to build “Cropping page” with the design of their own brand.In order to control the actions for cropping images, you can use CropController from whatever your Widgets.

Note

Please note that this package is at the very starting point of developping. Some functionality may lack, APIs have to be more enhanced, and several bugs have to be fixed.

I will appreciate your idea or suggestions to achieve the basic idea written above.

Usage

Place Crop Widget wherever you want to place image cropping UI.

Widget build(BuildContext context) {
  return Crop(
    image: _imageData,
    aspectRatio: 4 / 3,
    initialSize: 0.5,
    withCircleUi: false,
    onCropped: (image) {
      // do something with image data 
    }
  );
}

Usage of each properties are listed below.

• image is Image data whose type is UInt8List, and the result of cropping can be obtained via onCropped callback.
• aspectRatio is the aspect ratio of cropping area. Set null or just omit if you want to crop images with any aspect ratio.
• aspectRatio can be changed dynamically via setter of CropController.aspectRatio. (see below)
• initialSize is the initial size of cropping area. 1.0 (or null, by default) fits the size of image, which means cropping area extends as much as possible. 0.5 would be the half. This value is also referred when aspectRatio changes via CropController.aspectRatio.
• withCircleUi flag is to decide the shape of cropping UI. If true, aspectRatio is automatically set 1.0 and the shape of cropping UI would be circle. Note that this flag does NOT affect to the result of cropping image. If you want cropped images with circle shape, call CropController.cropCircle instead of CropController.crop.

If you want to controll from your own designed Widgets, create a CropController instance and pass it to controller property of Crop.

final _controller = CropController();

Widget build(BuildContext context) {
  return Crop(
    image: _imageData,
    onCropped: (image) {
      // do something with image data 
    }
    controller: _controller,
  );
}

You can call _controller.crop() to crop a image.

ElevatedButton(
  child: Text('Crop it!')
  onPressed: _cropController.crop,
),

Because _controller.crop() only kicks the cropping process, this method returns immediately without any cropped image data. You can always obtain the result of cropping images via onCropped callback of Crop Widget.

In addition, aspectRatio and withCircleUi can also be changed via CropController.

Download Image Cropping Widget for Flutter source code on GitHub

https://github.com/chooyan-eng/crop_your_image