flutter-自定义图片裁剪

custom_image_crop

An Image cropper that is customizable

CustomImageCrop

CustomImageCrop(
  cropController: controller,
  image: const AssetImage('assets/test.png'),
),

You can provide the image using any Imageprovider.

Parameters

required image

The image that needs to be cropped

cropController

The controller used to adjust the image and crop it.

overlayColor

The color above the image that will be cropped

backgroundColor

The color behind the image. This color will also be used when there are gaps/empty space after the cropping

shape

The shape of the cropping path.

maskShape

The shape of the UI masking.

cropPercentage

How big the crop should be in regards to the width and height available to the cropping widget.

drawPath

How the border of the crop should be painted. default DottedCropPathPainter.drawPath and SolidCropPathPainter.drawPath are provided, but you can create/provide any CustomPaint.

pathPaint

Custom painting for the crop area border style.

canRotate

Whether to allow the image to be rotated.

customProgressIndicator

Custom widget for progress indicator.

ratio

Ratio of the cropping area. If shape`` is set to CustomCropShape.Ratio, this property is required. For example, to create a square crop area, use [Ratio(width: 1, height: 1). To create a rectangular crop area with a 16:9 aspect ratio, use [Ratio(width: 16, height: 9)`.

borderRadius

The radius for rounded corners of the cropping area.

forceInsideCropArea

Whether image area must cover clip path.

Controller Methods

addTransition

void addTransition(CropImageData transition)

Add the position, angle and scale to the current state. This can be used to adjust the image with sliders, buttons, etc.

setData

void setData(CropImageData data)

Set the position, angle and scale to the specified values. This can be used to center the image by pressing a button for example.

reset

void reset()

Reset the image to its default state

onCropImage

Future<MemoryImage> onCropImage()

Crops the image in its current state, this will return a MemoryImage that contains the cropped image

Example

See example/lib

class MyHomePage extends StatefulWidget {
  final String title;

  MyHomePage({
    required this.title,
    Key? key,
  }) : super(key: key);

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  late CustomImageCropController controller;

  @override
  void initState() {
    super.initState();
    controller = CustomImageCropController();
  }

  @override
  void dispose() {
    controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
        brightness: Brightness.dark,
      ),
      body: Column(
        children: [
          Expanded(
            child: CustomImageCrop(
              cropController: controller,
              image: const AssetImage('assets/test.png'), // Any Imageprovider will work, try with a NetworkImage for example...
            ),
          ),
          Row(
            children: [
              IconButton(icon: const Icon(Icons.refresh), onPressed: controller.reset),
              IconButton(icon: const Icon(Icons.zoom_in), onPressed: () => controller.addTransition(CropImageData(scale: 1.33))),
              IconButton(icon: const Icon(Icons.zoom_out), onPressed: () => controller.addTransition(CropImageData(scale: 0.75))),
              IconButton(icon: const Icon(Icons.rotate_left), onPressed: () => controller.addTransition(CropImageData(angle: -pi / 4))),
              IconButton(icon: const Icon(Icons.rotate_right), onPressed: () => controller.addTransition(CropImageData(angle: pi / 4))),
              IconButton(
                icon: const Icon(Icons.crop),
                onPressed: () async {
                  final image = await controller.onCropImage();
                  if (image != null) {
                    Navigator.of(context).push(MaterialPageRoute(builder: (BuildContext context) => ResultScreen(image: image)));
                  }
                },
              ),
            ],
          ),
          SizedBox(height: MediaQuery.of(context).padding.bottom),
        ],
      ),
    );
  }
}