feat: Add avatar crop

2 files changed, 123 insertions, 0 deletions

diff --git a/src/components/AvatarCrop/AvatarCrop.tsx b/src/components/AvatarCrop/AvatarCrop.tsx
new file mode 100644
index 0000000..e344edd
--- /dev/null
+++ b/src/components/AvatarCrop/AvatarCrop.tsx
@@ -0,0 +1,69 @@
+import React, {useCallback, useContext, useState} from 'react';

+import Cropper from 'react-easy-crop';

+import {makeStyles} from '@material-ui/core/styles';

+import SendIcon from "@material-ui/icons/Send";

+import ModalScreen from "../ModalScreen/ModalScreen";

+import { getCroppedImg } from './canvasUtils'

+

+interface PropTypes {

+  location?: any;

+  avatarToCrop: string;

+  callback: (file: File) => void;

+}

+

+const useStyles = makeStyles(theme => ({

+  cropContainer: {

+    position: 'relative',

+    width: '100%',

+    height: '100vh',

+    background: '#333',

+    [theme.breakpoints.up('sm')]: {

+      height: 400,

+    },

+  }

+}));

+

+const AvatarCrop: React.FC<PropTypes> = ({location, avatarToCrop, callback}) => {

+  const classes = useStyles();

+  const [crop, setCrop] = useState({x: 0, y: 0});

+  const [zoom, setZoom] = useState(1);

+  const [croppedAreaPixels, setCroppedAreaPixels] = useState(null);

+

+  const onCropComplete = useCallback((croppedArea, croppedAreaPixels) => {

+    setCroppedAreaPixels(croppedAreaPixels)

+  }, []);

+

+  const handleLoadCroppedImage = useCallback(async () => {

+    try {

+      const croppedImage = await getCroppedImg(avatarToCrop, croppedAreaPixels);

+      callback(croppedImage);

+    } catch (e) {

+      console.error(e)

+    }

+  }, [avatarToCrop, croppedAreaPixels]);

+

+  return (

+    <ModalScreen

+      title="Choose area"

+      actionIcon={<SendIcon />}

+      handleAction={handleLoadCroppedImage}

+      isActionDisabled={false}

+    >

+      <div className={classes.cropContainer}>

+        <Cropper

+          image={avatarToCrop}

+          crop={crop}

+          zoom={zoom}

+          aspect={1}

+          cropShape="round"

+          showGrid={false}

+          onCropChange={setCrop}

+          onCropComplete={onCropComplete}

+          onZoomChange={setZoom}

+        />

+      </div>

+    </ModalScreen>

+  )

+};

+

+export default AvatarCrop;

diff --git a/src/components/AvatarCrop/canvasUtils.js b/src/components/AvatarCrop/canvasUtils.js
new file mode 100644
index 0000000..b01aadc
--- /dev/null
+++ b/src/components/AvatarCrop/canvasUtils.js
@@ -0,0 +1,54 @@
+const createImage = url =>

+  new Promise((resolve, reject) => {

+    const image = new Image();

+    image.addEventListener('load', () => resolve(image));

+    image.addEventListener('error', error => reject(error));

+    image.setAttribute('crossOrigin', 'anonymous') ;// needed to avoid cross-origin issues on CodeSandbox

+    image.src = url

+  });

+

+export async function getCroppedImg(imageSrc, pixelCrop) {

+  const image = await createImage(imageSrc);

+  const canvas = document.createElement('canvas');

+  const ctx = canvas.getContext('2d');

+

+  const maxSize = Math.max(image.width, image.height);

+  const safeArea = 2 * ((maxSize / 2) * Math.sqrt(2));

+

+  // set each dimensions to double largest dimension to allow for a safe area for the

+  // image to rotate in without being clipped by canvas context

+  canvas.width = safeArea;

+  canvas.height = safeArea;

+

+  // translate canvas context to a central location on image to allow rotating around the center.

+  ctx.translate(safeArea / 2, safeArea / 2);

+  ctx.translate(-safeArea / 2, -safeArea / 2);

+

+  // draw rotated image and store data.

+  ctx.drawImage(

+    image,

+    safeArea / 2 - image.width * 0.5,

+    safeArea / 2 - image.height * 0.5

+  );

+  const data = ctx.getImageData(0, 0, safeArea, safeArea);

+

+  // set canvas width to final desired crop size - this will clear existing context

+  canvas.width = pixelCrop.width;

+  canvas.height = pixelCrop.height;

+

+  // paste generated rotate image with correct offsets for x,y crop values.

+  ctx.putImageData(

+    data,

+    Math.round(0 - safeArea / 2 + image.width * 0.5 - pixelCrop.x),

+    Math.round(0 - safeArea / 2 + image.height * 0.5 - pixelCrop.y)

+  );

+

+  // As Base64 string

+  // return canvas.toDataURL('image/jpeg');

+

+  // As a blob

+

+  return new Promise(resolve => {

+    canvas.toBlob(file => resolve(file))

+  })

+}