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| 1 | +import React, { useState, useRef } from 'react'; |
| 2 | +import { Document, Page } from 'react-pdf'; |
| 3 | +import "react-pdf/dist/esm/Page/TextLayer.css"; |
| 4 | +import "react-pdf/dist/esm/Page/AnnotationLayer.css"; |
| 5 | +import { useAppSelector } from 'redux/hooks' |
| 6 | +import styles from "./pdfViewer.scss"; |
| 7 | + |
| 8 | +interface PDFWithHighlightProps { |
| 9 | + file: Blob | File; |
| 10 | +} |
| 11 | + |
| 12 | +interface Highlight { |
| 13 | + color: string, |
| 14 | + text: string, |
| 15 | + rect: { |
| 16 | + top: number; |
| 17 | + left: number; |
| 18 | + width: number; |
| 19 | + height: number; |
| 20 | + } |
| 21 | +} |
| 22 | + |
| 23 | +const PDFViewer: React.FC<PDFWithHighlightProps> = ({ file }) => { |
| 24 | + const [highlights, setHighlights] = useState<Highlight[]>([]); |
| 25 | + const [numPages, setNumPages] = useState(0); |
| 26 | + const [annotate, setAnnotate] = useState(false); |
| 27 | + const [annotationColor, setAnnotationColor] = useState('rgba(0, 225, 255, 0.25)'); |
| 28 | + const [annotationBorderColor, setAnnotationBorderColor] = useState('rgba(0, 225, 255, 0.75)'); |
| 29 | + const containerRef = useRef<HTMLDivElement | null>(null); |
| 30 | + const role = useAppSelector((store) => store.roleMode) |
| 31 | + |
| 32 | + const [startPoint, setStartPoint] = useState<{ x: number; y: number } | null>(null); |
| 33 | + const [currentRect, setCurrentRect] = useState<Highlight['rect'] | null>(null); |
| 34 | + |
| 35 | + const handleMouseDown = (e: React.MouseEvent) => { |
| 36 | + if (!containerRef.current) return; |
| 37 | + const containerRect = containerRef.current.getBoundingClientRect(); |
| 38 | + setStartPoint({ |
| 39 | + x: e.clientX - containerRect.left, |
| 40 | + y: e.clientY - containerRect.top, |
| 41 | + }); |
| 42 | + }; |
| 43 | + |
| 44 | + const handleMouseMove = (e: React.MouseEvent) => { |
| 45 | + if (!startPoint || !containerRef.current) return; |
| 46 | + const containerRect = containerRef.current.getBoundingClientRect(); |
| 47 | + const x = e.clientX - containerRect.left; |
| 48 | + const y = e.clientY - containerRect.top; |
| 49 | + |
| 50 | + const width = Math.abs(x - startPoint.x); |
| 51 | + const height = Math.abs(y - startPoint.y); |
| 52 | + |
| 53 | + setCurrentRect({ |
| 54 | + left: Math.min(x, startPoint.x), |
| 55 | + top: Math.min(y, startPoint.y), |
| 56 | + width, |
| 57 | + height, |
| 58 | + }); |
| 59 | + }; |
| 60 | + |
| 61 | + const handleMouseUp = () => { |
| 62 | + if (currentRect) { |
| 63 | + const text = prompt("Enter annotation text:"); |
| 64 | + setHighlights((prev) => [ |
| 65 | + ...prev, |
| 66 | + { |
| 67 | + color: annotationColor, |
| 68 | + rect: currentRect, |
| 69 | + text: text || "", // Add text to the highlight object |
| 70 | + }, |
| 71 | + ]); |
| 72 | + } |
| 73 | + setStartPoint(null); |
| 74 | + setCurrentRect(null); |
| 75 | + }; |
| 76 | + |
| 77 | + const onDocumentLoadSuccess = ({ numPages }: { numPages: number }) => { |
| 78 | + setNumPages(numPages) |
| 79 | + } |
| 80 | + |
| 81 | + const toggleAnnotate = () => { |
| 82 | + setAnnotate(!annotate); |
| 83 | + } |
| 84 | + |
| 85 | + const setColors = (e: React.MouseEvent<HTMLButtonElement>) => { |
| 86 | + const computedStyle = window.getComputedStyle(e.currentTarget); |
| 87 | + const color = computedStyle.backgroundColor; |
| 88 | + const borderColor = color.replace("0.25", "0.75"); |
| 89 | + console.log(borderColor); |
| 90 | + |
| 91 | + setAnnotationColor(color); |
| 92 | + |
| 93 | + // color is in rgba. change the opacity to 0.75 |
| 94 | + setAnnotationBorderColor(borderColor); |
| 95 | + } |
| 96 | + |
| 97 | + return ( |
| 98 | + <div className={styles.viewPdfWrapper}> |
| 99 | + <div |
| 100 | + ref={containerRef} |
| 101 | + style={{ position: 'relative' }} |
| 102 | + onMouseDown={annotate ? handleMouseDown : undefined} |
| 103 | + onMouseMove={annotate ? handleMouseMove : undefined} |
| 104 | + onMouseUp={annotate ? handleMouseUp : undefined} |
| 105 | + > |
| 106 | + {/* react-pdf document */} |
| 107 | + <Document |
| 108 | + file={file} |
| 109 | + onLoadSuccess={onDocumentLoadSuccess} |
| 110 | + > |
| 111 | + {[...Array(numPages)].map((_, index) => { |
| 112 | + const pageNumber = index + 1; |
| 113 | + return ( |
| 114 | + <Page |
| 115 | + key={pageNumber} |
| 116 | + pageNumber={pageNumber} |
| 117 | + renderTextLayer={false} |
| 118 | + renderAnnotationLayer={false} |
| 119 | + scale={1.0} |
| 120 | + /> |
| 121 | + ); |
| 122 | + })} |
| 123 | + </Document> |
| 124 | + {/* Render current rectangle while dragging */} |
| 125 | + {annotate && currentRect && ( |
| 126 | + <div |
| 127 | + style={{ |
| 128 | + position: 'absolute', |
| 129 | + left: `${currentRect.left}px`, |
| 130 | + top: `${currentRect.top}px`, |
| 131 | + width: `${currentRect.width}px`, |
| 132 | + height: `${currentRect.height}px`, |
| 133 | + backgroundColor: annotationColor, |
| 134 | + border: `2px dashed ${annotationBorderColor}`, |
| 135 | + pointerEvents: 'none', |
| 136 | + }} |
| 137 | + /> |
| 138 | + )} |
| 139 | + {/* Show all highlights */} |
| 140 | + {highlights.map((highlight, index) => ( |
| 141 | + <div |
| 142 | + key={index} |
| 143 | + style={{ |
| 144 | + position: 'absolute', |
| 145 | + left: `${highlight.rect.left}px`, |
| 146 | + top: `${highlight.rect.top}px`, |
| 147 | + width: `${highlight.rect.width}px`, |
| 148 | + height: `${highlight.rect.height}px`, |
| 149 | + backgroundColor: highlight.color, |
| 150 | + pointerEvents: 'none', |
| 151 | + textAlign: 'center', |
| 152 | + padding: '2px', |
| 153 | + }} |
| 154 | + ><span style={{ color: '#000', margin: 'auto', fontWeight: '700' }}>{highlight.text}</span></div> |
| 155 | + ))} |
| 156 | + </div> |
| 157 | + |
| 158 | + {/* annotation options */} |
| 159 | + {role.isInstructor() && (<div className={styles.annotationOptions}> |
| 160 | + <button |
| 161 | + className="btnSecondary" |
| 162 | + onClick={toggleAnnotate} |
| 163 | + style={{ whiteSpace: 'nowrap' }} |
| 164 | + > |
| 165 | + {annotate ? 'Set View Mode' : 'Set Annotate Mode'} |
| 166 | + </button> |
| 167 | + {annotate && (<div className={styles.highlightColors}> |
| 168 | + <button className={`${styles.colorBtn} ${styles.blue}`} onClick={setColors}>Blue</button> |
| 169 | + <button className={`${styles.colorBtn} ${styles.green}`} onClick={setColors}>Green</button> |
| 170 | + <button className={`${styles.colorBtn} ${styles.red}`} onClick={setColors}>Red</button> |
| 171 | + <button className={`${styles.colorBtn} ${styles.yellow}`} onClick={setColors}>Yellow</button> |
| 172 | + </div>)} |
| 173 | + </div>)} |
| 174 | + </div> |
| 175 | + ); |
| 176 | +}; |
| 177 | + |
| 178 | +export default PDFViewer; |
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