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| 1 | +import React, { useState, useRef, useEffect, useCallback } from 'react' |
| 2 | +import { createPortal } from 'react-dom' |
| 3 | +import Mermaid from '@theme/Mermaid' |
| 4 | +import styles from './styles.module.css' |
| 5 | + |
| 6 | +const ZoomableMermaid = ({ children, title, defaultZoom = 1.2 }) => { |
| 7 | + const [isModalOpen, setIsModalOpen] = useState(false) |
| 8 | + const [isHovered, setIsHovered] = useState(false) |
| 9 | + const [zoomLevel, setZoomLevel] = useState(defaultZoom) // Use defaultZoom prop |
| 10 | + const modalRef = useRef(null) |
| 11 | + const containerRef = useRef(null) |
| 12 | + |
| 13 | + const openModal = useCallback(() => { |
| 14 | + setIsModalOpen(true) |
| 15 | + setZoomLevel(defaultZoom) // Reset to default zoom when opening |
| 16 | + document.body.style.overflow = 'hidden' |
| 17 | + }, [defaultZoom]) |
| 18 | + |
| 19 | + const closeModal = useCallback(() => { |
| 20 | + setIsModalOpen(false) |
| 21 | + document.body.style.overflow = 'unset' |
| 22 | + // Return focus to the original container |
| 23 | + if (containerRef.current) { |
| 24 | + containerRef.current.focus() |
| 25 | + } |
| 26 | + }, []) |
| 27 | + |
| 28 | + const zoomIn = useCallback(() => { |
| 29 | + setZoomLevel(prev => Math.min(prev + 0.2, 5.0)) // Max 500% |
| 30 | + }, []) |
| 31 | + |
| 32 | + const zoomOut = useCallback(() => { |
| 33 | + setZoomLevel(prev => Math.max(prev - 0.2, 0.5)) // Min 50% |
| 34 | + }, []) |
| 35 | + |
| 36 | + const resetZoom = useCallback(() => { |
| 37 | + setZoomLevel(defaultZoom) // Reset to custom default instead of hardcoded 1.2 |
| 38 | + }, [defaultZoom]) |
| 39 | + |
| 40 | + useEffect(() => { |
| 41 | + const handleEscape = (e) => { |
| 42 | + if (e.key === 'Escape' && isModalOpen) { |
| 43 | + closeModal() |
| 44 | + } |
| 45 | + } |
| 46 | + |
| 47 | + const handleClickOutside = (e) => { |
| 48 | + if (modalRef.current && !modalRef.current.contains(e.target)) { |
| 49 | + closeModal() |
| 50 | + } |
| 51 | + } |
| 52 | + |
| 53 | + const handleKeydown = (e) => { |
| 54 | + if (!isModalOpen) return |
| 55 | + |
| 56 | + if (e.key === '=' || e.key === '+') { |
| 57 | + e.preventDefault() |
| 58 | + zoomIn() |
| 59 | + } |
| 60 | + else if (e.key === '-') { |
| 61 | + e.preventDefault() |
| 62 | + zoomOut() |
| 63 | + } |
| 64 | + else if (e.key === '0') { |
| 65 | + e.preventDefault() |
| 66 | + resetZoom() |
| 67 | + } |
| 68 | + } |
| 69 | + |
| 70 | + if (isModalOpen) { |
| 71 | + document.addEventListener('keydown', handleEscape) |
| 72 | + document.addEventListener('mousedown', handleClickOutside) |
| 73 | + document.addEventListener('keydown', handleKeydown) |
| 74 | + |
| 75 | + // Focus the modal content when opened |
| 76 | + setTimeout(() => { |
| 77 | + if (modalRef.current) { |
| 78 | + modalRef.current.focus() |
| 79 | + } |
| 80 | + }, 100) |
| 81 | + } |
| 82 | + |
| 83 | + return () => { |
| 84 | + document.removeEventListener('keydown', handleEscape) |
| 85 | + document.removeEventListener('mousedown', handleClickOutside) |
| 86 | + document.removeEventListener('keydown', handleKeydown) |
| 87 | + } |
| 88 | + }, [isModalOpen, closeModal, zoomIn, zoomOut, resetZoom]) |
| 89 | + |
| 90 | + // Cleanup on unmount |
| 91 | + useEffect(() => { |
| 92 | + return () => { |
| 93 | + document.body.style.overflow = 'unset' |
| 94 | + } |
| 95 | + }, []) |
| 96 | + |
| 97 | + const handleKeyDown = (e) => { |
| 98 | + if (e.key === 'Enter' || e.key === ' ') { |
| 99 | + e.preventDefault() |
| 100 | + openModal() |
| 101 | + } |
| 102 | + } |
| 103 | + |
| 104 | + const modalContent = ( |
| 105 | + <div |
| 106 | + className={styles.modal} |
| 107 | + role="dialog" |
| 108 | + aria-modal="true" |
| 109 | + aria-labelledby={title ? 'modal-title' : undefined} |
| 110 | + aria-describedby="modal-description" |
| 111 | + > |
| 112 | + <div |
| 113 | + className={styles.modalContent} |
| 114 | + ref={modalRef} |
| 115 | + tabIndex={-1} |
| 116 | + > |
| 117 | + <div className={styles.modalHeader}> |
| 118 | + {title && ( |
| 119 | + <h3 id="modal-title" className={styles.modalTitle}> |
| 120 | + {title} |
| 121 | + </h3> |
| 122 | + )} |
| 123 | + <div className={styles.modalControls}> |
| 124 | + <span className={styles.zoomIndicator}> |
| 125 | + {Math.round(zoomLevel * 100)} |
| 126 | + % |
| 127 | + </span> |
| 128 | + <button |
| 129 | + className={styles.zoomButton} |
| 130 | + onClick={zoomOut} |
| 131 | + disabled={zoomLevel <= 0.5} |
| 132 | + aria-label="Reduce the size of the chart" |
| 133 | + type="button" |
| 134 | + title="Reduce (Shortcut key: -)" |
| 135 | + > |
| 136 | + <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2"> |
| 137 | + <circle cx="11" cy="11" r="8" /> |
| 138 | + <path d="M8 11h6" /> |
| 139 | + <path d="m21 21-4.35-4.35" /> |
| 140 | + </svg> |
| 141 | + </button> |
| 142 | + <button |
| 143 | + className={styles.resetButton} |
| 144 | + onClick={resetZoom} |
| 145 | + aria-label={`Reset to default zoom level ${Math.round(defaultZoom * 100)}%`} |
| 146 | + type="button" |
| 147 | + title={`Reset to default zoom level ${Math.round(defaultZoom * 100)}% (Shortcut key: 0)`} |
| 148 | + > |
| 149 | + <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2"> |
| 150 | + <path d="M3 3l18 18" /> |
| 151 | + <path d="m19 4-7 7-7-7" /> |
| 152 | + <path d="m5 20 7-7 7 7" /> |
| 153 | + </svg> |
| 154 | + </button> |
| 155 | + <button |
| 156 | + className={styles.zoomButton} |
| 157 | + onClick={zoomIn} |
| 158 | + disabled={zoomLevel >= 5.0} |
| 159 | + aria-label="Enlarge the chart" |
| 160 | + type="button" |
| 161 | + title="Enlarge (Shortcut key: +)" |
| 162 | + > |
| 163 | + <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2"> |
| 164 | + <circle cx="11" cy="11" r="8" /> |
| 165 | + <path d="M8 11h6" /> |
| 166 | + <path d="M11 8v6" /> |
| 167 | + <path d="m21 21-4.35-4.35" /> |
| 168 | + </svg> |
| 169 | + </button> |
| 170 | + <button |
| 171 | + className={styles.closeButton} |
| 172 | + onClick={closeModal} |
| 173 | + aria-label="Close the zoomed view" |
| 174 | + type="button" |
| 175 | + > |
| 176 | + <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2"> |
| 177 | + <line x1="18" y1="6" x2="6" y2="18" /> |
| 178 | + <line x1="6" y1="6" x2="18" y2="18" /> |
| 179 | + </svg> |
| 180 | + </button> |
| 181 | + </div> |
| 182 | + </div> |
| 183 | + <div |
| 184 | + className={styles.modalBody} |
| 185 | + id="modal-description" |
| 186 | + aria-label="Enlarged Mermaid diagram" |
| 187 | + > |
| 188 | + <div |
| 189 | + className={styles.diagramContainer} |
| 190 | + style={{ |
| 191 | + transform: `scale(${zoomLevel})`, |
| 192 | + // Ensure scaling is from the center of the diagram. |
| 193 | + // Fix the issue where the top scroll bar is not visible when the chart is enlarged. |
| 194 | + transformOrigin: 'center top', |
| 195 | + }} |
| 196 | + > |
| 197 | + <Mermaid value={children} /> |
| 198 | + </div> |
| 199 | + </div> |
| 200 | + </div> |
| 201 | + </div> |
| 202 | + ) |
| 203 | + |
| 204 | + return ( |
| 205 | + <> |
| 206 | + <div |
| 207 | + ref={containerRef} |
| 208 | + className={`${styles.mermaidContainer} ${isHovered ? styles.hovered : ''}`} |
| 209 | + onClick={openModal} |
| 210 | + onMouseEnter={() => setIsHovered(true)} |
| 211 | + onMouseLeave={() => setIsHovered(false)} |
| 212 | + role="button" |
| 213 | + tabIndex={0} |
| 214 | + onKeyDown={handleKeyDown} |
| 215 | + aria-label={`Click to enlarge ${title || 'Mermaid diagram'}`} |
| 216 | + aria-expanded={isModalOpen} |
| 217 | + > |
| 218 | + <div className={styles.zoomHint} aria-hidden="true"> |
| 219 | + <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2"> |
| 220 | + <circle cx="11" cy="11" r="8" /> |
| 221 | + <path d="m21 21-4.35-4.35" /> |
| 222 | + <path d="M11 8v6" /> |
| 223 | + <path d="M8 11h6" /> |
| 224 | + </svg> |
| 225 | + <span>Click to enlarge</span> |
| 226 | + </div> |
| 227 | + <Mermaid value={children} /> |
| 228 | + </div> |
| 229 | + |
| 230 | + {isModalOpen && createPortal(modalContent, document.body)} |
| 231 | + </> |
| 232 | + ) |
| 233 | +} |
| 234 | + |
| 235 | +export default ZoomableMermaid |
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