All files react-image-zooom.js

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import React, { useState, useEffect } from "react";
import styled, { keyframes } from "styled-components";
 
const rotate = keyframes`
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
`;
 
const Figure = styled.figure`
  position: relative;
  display: inline-block;
  width: auto;
  min-height: 25vh;
  background-position: 50% 50%;
  background-color: #eee;
  margin: 0;
  overflow: hidden;
  cursor: zoom-in;
  &:before {
    content: "";
    background-color: transparent;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    height: 100%;
    opacity: 1;
    transition: opacity 0.2s ease-in-out;
    z-index: 1;
  }
  &:after {
    content: "";
    position: absolute;
    top: calc(50% - 25px);
    left: calc(50% - 25px);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 5px solid transparent;
    border-top-color: #333;
    border-right-color: #333;
    border-bottom-color: #333;
    animation: ${rotate} 2s linear infinite;
    opacity: 1;
    transition: opacity 0.2s ease-in-out;
    z-index: 2;
  }
  &.loaded {
    min-height: auto;
    &:before {
      opacity: 0;
    }
    &:after {
      opacity: 0;
    }
  }
`;
 
const Img = styled.img`
  transition: opacity 0.8s;
  display: block;
`;
 
function ImageZoom({ zoom = "200", alt = "This is an imageZoom image", width = "100%", height = "auto", src, id, className, onError, errorContent = <>There was a problem loading your image</> }) {
  // define and set default values to the states of the component
  const [zoomed, setZoomed] = useState("1");
  const [position, setPosition] = useState("50% 50%");
  const [imgData, setImgData] = useState(null);
  const [error, setError] = useState(false);
  // convert state data into strings to be used as helper classes
  const figureClass = imgData ? "loaded" : "loading";
  const figureZoomed = zoomed === "0" ? "zoomed" : "fullView";
 
  const zoomInPosition = (e) => {
    // this will handle the calculations of the area where the image needs to zoom in depending on the user interaction
    const zoomer = e.currentTarget.getBoundingClientRect();
    let x = ((e.clientX - zoomer.x) / zoomer.width) * 100;
    let y = ((e.clientY - zoomer.y) / zoomer.height) * 100;
    setPosition(`${x}% ${y}%`);
  }
 
  const toggleZoomImage = (e) => {
    if (zoomed === "0") {
      // zoom out
      setZoomed("1");
    } else {
      //zoom in and set the background position correctly
      setZoomed("0");
      zoomInPosition(e);
    }
  }
 
  const handleClick = (e) => {
    // Handle the click events
    toggleZoomImage(e);
  }
 
  const handleMove = (e) => {
    // Handle the mouse move events
    if (zoomed === "0") {
      zoomInPosition(e);
    }
  }
 
  const handleLeave = () => {
    // Resets the state of the component on mouse leave
    setZoomed("1");
    setPosition("50% 50%");
  }
 
  useEffect(() => {
    // This checks if the prop src was passed when the component was called and throw an error if this is null or set to empty
    if (src === "" || src === null) {
      throw new Error(
        "Prop src must be defined when using ImageZoom component!"
      );
    }
 
    // Set initial state on component mount
    setZoomed("0");
    let img = new Image();
    img.addEventListener("load", () => {
      // gracefully disable the loading animation
      setTimeout(() => {
        setZoomed("1");
        setImgData(img.src);
      }, 200);
    });
    img.addEventListener("error", (error) => {
      setError(true);
      console.log('error');
      onError(); // call onError if image fails to load
    });
    img.src = src;
  }, [onError, src]);
 
  Iif (error) {
    return (
      <>
        {errorContent}
      </>
    )
  } else {
    return (
      <Figure
        id={id}
        className={[figureClass, figureZoomed, className].join(" ")}
        style={{
          backgroundImage: `url( ${zoomed === '0' ? imgData : ''} )`,
          backgroundSize: zoom + "%",
          backgroundPosition: position,
        }}
        onClick={(e) => handleClick(e)}
        onMouseMove={(e) => handleMove(e)}
        onMouseLeave={() => handleLeave()}
      >
        <Img
          id="imageZoom"
          src={imgData}
          alt={alt}
          style={{ opacity: zoomed }}
          width={width}
          height={height}
        />
      </Figure>
    );
  }
 
}
 
export default ImageZoom;