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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 | 1x 1x 1x 8x 8x 8x 8x 8x 8x 8x 1x 1x 1x 1x 8x 2x 1x 1x 1x 8x 2x 8x 8x 8x 4x 2x 2x 2x 2x 2x 2x 8x 8x 2x | 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; |