"Avatar/badge" Code Answer's

Avatar/badge

By Cheerful Cat on May 24, 2021

import React, { useEffect, useRef } from "react";
import List from "@material-ui/core/List";
import t from "prop-types";
import { makeStyles } from "@material-ui/core/styles";
import { Avatar, Badge } from "@material-ui/core";
import withStyles from "@material-ui/core/styles/withStyles";
import IconButton from "@material-ui/core/IconButton";
import EditIcon from "@material-ui/icons/Edit";
import useTheme from "@material-ui/core/styles/useTheme";

import("screw-filereader");

const useStyles = makeStyles((theme) => ({
  root: {
    display: "flex",
    "& > *": {
      margin: theme.spacing(1)
    }
  },
  form: {
    display: "flex",
    flexDirection: "column",
    margin: "auto",
    width: "fit-content"
  },
  input: {
    fontSize: 15
  },
  large: {
    width: theme.spacing(25),
    height: theme.spacing(25),
    border: `4px solid ${theme.palette.primary.main}`
  }
}));

const EditIconButton = withStyles((theme) => ({
  root: {
    width: 22,
    height: 22,
    padding: 15,
    border: `2px solid ${theme.palette.primary.main}`
  }
}))(IconButton);

export const AvatarPicker = (props) => {
  const [file, setFile] = React.useState("");
  const theme = useTheme();
  const classes = useStyles();

  const imageRef = useRef();

  const { handleChangeImage, avatarImage } = props;

  useEffect(() => {
    if (!file && avatarImage) {
      setFile(URL.createObjectURL(avatarImage));
    }

    return () => {
      if (file) URL.revokeObjectURL(file);
    };
  }, [file, avatarImage]);

  const renderImage = (fileObject) => {
    fileObject.image().then((img) => {
      const canvas = document.createElement("canvas");
      const ctx = canvas.getContext("2d");
      const maxWidth = 256;
      const maxHeight = 256;

      const ratio = Math.min(maxWidth / img.width, maxHeight / img.height);
      const width = (img.width * ratio + 0.5) | 0;
      const height = (img.height * ratio + 0.5) | 0;

      canvas.width = width;
      canvas.height = height;
      ctx.drawImage(img, 0, 0, width, height);

      canvas.toBlob((blob) => {
        const resizedFile = new File([blob], file.name, fileObject);
        setFile(URL.createObjectURL(resizedFile));
        handleChangeImage(resizedFile);
      });
    });
  };

  const showOpenFileDialog = () => {
    imageRef.current.click();
  };

  const handleChange = (event) => {
    const fileObject = event.target.files[0];
    if (!fileObject) return;
    renderImage(fileObject);
  };

  return (
    <List data-testid={"image-upload"}>
      <div
        style={{
          display: "flex",
          justifyContent: "center",
          margin: "20px 10px"
        }}
      >
        <div className={classes.root}>
          <Badge
            overlap="circle"
            anchorOrigin={{
              vertical: "bottom",
              horizontal: "right"
            }}
            badgeContent={
              <EditIconButton
                onClick={showOpenFileDialog}
                style={{ background: theme.palette.primary.main }}
              >
                <EditIcon />
              </EditIconButton>
            }
          >
            <Avatar alt={"avatar"} src={file} className={classes.large} />
          </Badge>
          <input
            ref={imageRef}
            type="file"
            style={{ display: "none" }}
            accept="image/*"
            onChange={handleChange}
          />
        </div>
      </div>
    </List>
  );
};
AvatarPicker.propTypes = {
  handleChangeImage: t.func.isRequired,
  avatarImage: t.object
};
export default AvatarPicker;

Source: stackoverflow.com

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