Download apps/readest-app/src/app/reader/components/ImageViewer.tsx from echodict/readest: direct link, hf CLI and curl.
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https://huggingface.co/datasets/echodict/readest/resolve/main/apps/readest-app/src/app/reader/components/ImageViewer.tsx
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13.4 kB
| import clsx from 'clsx'; | |
| import React, { useState, useRef, useEffect } from 'react'; | |
| import Image from 'next/image'; | |
| import { IoChevronBack, IoChevronForward } from 'react-icons/io5'; | |
| import { useTranslation } from '@/hooks/useTranslation'; | |
| import ZoomControls from './ZoomControls'; | |
| interface ImageViewerProps { | |
| src: string | null; | |
| onClose: () => void; | |
| onPrevious?: () => void; | |
| onNext?: () => void; | |
| } | |
| const MIN_SCALE = 0.5; | |
| const MAX_SCALE = 8; | |
| const ZOOM_SPEED = 0.1; | |
| const MOBILE_ZOOM_SPEED = 0.001; | |
| const ZOOM_BIAS = 1.05; | |
| const ImageViewer: React.FC<ImageViewerProps> = ({ src, onClose, onPrevious, onNext }) => { | |
| const _ = useTranslation(); | |
| const [scale, setScale] = useState(1); | |
| const [zoomSpeed, setZoomSpeed] = useState(0.1); | |
| const [position, setPosition] = useState({ x: 0, y: 0 }); | |
| const [isDragging, setIsDragging] = useState(false); | |
| const [showZoomLabel, setShowZoomLabel] = useState(true); | |
| const lastTouchDistance = useRef<number>(0); | |
| const dragStart = useRef({ x: 0, y: 0 }); | |
| const wasDragging = useRef(false); | |
| const containerRef = useRef<HTMLDivElement>(null); | |
| const imageRef = useRef<HTMLImageElement>(null); | |
| const zoomLabelTimeoutRef = useRef<ReturnType<typeof setTimeout> | null>(null); | |
| const hideZoomLabelAfterDelay = () => { | |
| if (zoomLabelTimeoutRef.current) { | |
| clearTimeout(zoomLabelTimeoutRef.current); | |
| } | |
| setShowZoomLabel(true); | |
| zoomLabelTimeoutRef.current = setTimeout(() => { | |
| setShowZoomLabel(false); | |
| }, 2000); | |
| }; | |
| const handleZoomIn = () => { | |
| const newScale = Math.min(scale + ZOOM_SPEED, MAX_SCALE); | |
| setScale(newScale); | |
| setZoomSpeed(ZOOM_SPEED * ZOOM_BIAS * newScale); | |
| hideZoomLabelAfterDelay(); | |
| }; | |
| const handleZoomOut = () => { | |
| const newScale = Math.max(scale - ZOOM_SPEED, MIN_SCALE); | |
| if (newScale <= 1) { | |
| setPosition({ x: 0, y: 0 }); | |
| setScale(newScale); | |
| setZoomSpeed(ZOOM_SPEED); | |
| } else { | |
| setScale(newScale); | |
| setZoomSpeed(ZOOM_SPEED * ZOOM_BIAS * newScale); | |
| } | |
| hideZoomLabelAfterDelay(); | |
| }; | |
| const handleResetZoom = () => { | |
| setScale(1); | |
| setPosition({ x: 0, y: 0 }); | |
| setZoomSpeed(ZOOM_SPEED); | |
| hideZoomLabelAfterDelay(); | |
| }; | |
| const handleKeyDown = (e: React.KeyboardEvent) => { | |
| e.stopPropagation(); | |
| if (e.key === 'Escape') { | |
| onClose(); | |
| return; | |
| } | |
| // Arrow key navigation | |
| if (e.key === 'ArrowLeft' && onPrevious) { | |
| e.preventDefault(); | |
| handlePreviousImage(); | |
| return; | |
| } | |
| if (e.key === 'ArrowRight' && onNext) { | |
| e.preventDefault(); | |
| handleNextImage(); | |
| return; | |
| } | |
| const isCtrlOrCmd = e.ctrlKey || e.metaKey; | |
| if (isCtrlOrCmd) { | |
| e.preventDefault(); | |
| if (e.key === '=' || e.key === '+') { | |
| handleZoomIn(); | |
| } else if (e.key === '-' || e.key === '_') { | |
| handleZoomOut(); | |
| } else if (e.key === '0') { | |
| handleResetZoom(); | |
| } | |
| } | |
| }; | |
| const handlePreviousImage = () => { | |
| if (onPrevious) { | |
| onPrevious(); | |
| hideZoomLabelAfterDelay(); | |
| } | |
| }; | |
| const handleNextImage = () => { | |
| if (onNext) { | |
| onNext(); | |
| hideZoomLabelAfterDelay(); | |
| } | |
| }; | |
| const getZoomedOffset = ( | |
| anchorX: number, | |
| anchorY: number, | |
| currentScale: number, | |
| nextScale: number, | |
| currentPos: { x: number; y: number }, | |
| ) => { | |
| const scaleChange = nextScale / currentScale; | |
| return { | |
| x: anchorX - (anchorX - currentPos.x) * scaleChange, | |
| y: anchorY - (anchorY - currentPos.y) * scaleChange, | |
| }; | |
| }; | |
| // Grab Focus of modal and set up initial zoom label timeout | |
| useEffect(() => { | |
| containerRef.current?.focus(); | |
| setTimeout(() => { | |
| hideZoomLabelAfterDelay(); | |
| }, 0); | |
| return () => { | |
| if (zoomLabelTimeoutRef.current) { | |
| clearTimeout(zoomLabelTimeoutRef.current); | |
| } | |
| }; | |
| }, []); | |
| const handleWheel = (e: React.WheelEvent) => { | |
| // Only zoom when Ctrl/Cmd is pressed for consistency with browser behavior | |
| const isCtrlOrCmd = e.ctrlKey || e.metaKey; | |
| if (!isCtrlOrCmd) { | |
| // Allow default behavior (no zoom without modifier) | |
| return; | |
| } | |
| e.preventDefault(); | |
| const rect = containerRef.current?.getBoundingClientRect(); | |
| if (!rect) return; | |
| const delta = e.deltaY > 0 ? -zoomSpeed : zoomSpeed; | |
| const newScale = Math.min(Math.max(scale + delta, MIN_SCALE), MAX_SCALE); | |
| const newZoom = ZOOM_SPEED * ZOOM_BIAS * newScale; | |
| if (newScale <= 1) { | |
| setPosition({ x: 0, y: 0 }); | |
| setScale(newScale); | |
| setZoomSpeed(ZOOM_SPEED); | |
| hideZoomLabelAfterDelay(); | |
| return; | |
| } | |
| // Mouse position relative to the container element | |
| const mouseX = e.clientX - rect.left - rect.width / 2; | |
| const mouseY = e.clientY - rect.top - rect.height / 2; | |
| setPosition((prevPos) => { | |
| return getZoomedOffset(mouseX, mouseY, scale, newScale, prevPos); | |
| }); | |
| setScale(newScale); | |
| setZoomSpeed(newZoom); | |
| hideZoomLabelAfterDelay(); | |
| }; | |
| const handleImageMouseDown = (e: React.MouseEvent) => { | |
| if (isDragging || scale <= 1) return; | |
| e.stopPropagation(); | |
| e.preventDefault(); | |
| setIsDragging(true); | |
| wasDragging.current = false; | |
| dragStart.current = { x: e.clientX - position.x, y: e.clientY - position.y }; | |
| }; | |
| const handleImageMouseMove = (e: React.MouseEvent) => { | |
| if (!isDragging || scale <= 1) return; | |
| e.preventDefault(); | |
| wasDragging.current = true; | |
| const newX = e.clientX - dragStart.current.x; | |
| const newY = e.clientY - dragStart.current.y; | |
| setPosition({ x: newX, y: newY }); | |
| }; | |
| const handleImageMouseUp = (e: React.MouseEvent) => { | |
| if (isDragging) { | |
| e.stopPropagation(); | |
| } | |
| setIsDragging(false); | |
| }; | |
| const onTouchStart = (e: React.TouchEvent) => { | |
| const touches = e.touches; | |
| if (touches.length === 1 && scale > 1) { | |
| // Pan Start | |
| setIsDragging(true); | |
| wasDragging.current = false; | |
| const touch = touches[0]; | |
| if (!touch) return; | |
| dragStart.current = { | |
| x: touch.clientX - position.x, | |
| y: touch.clientY - position.y, | |
| }; | |
| } else if (touches.length === 2) { | |
| // Pinch Start | |
| setIsDragging(true); | |
| wasDragging.current = false; | |
| const touch1 = touches[0]; | |
| const touch2 = touches[1]; | |
| if (!touch1 || !touch2) return; | |
| lastTouchDistance.current = Math.hypot( | |
| touch1.clientX - touch2.clientX, | |
| touch1.clientY - touch2.clientY, | |
| ); | |
| } | |
| }; | |
| const onTouchMove = (e: React.TouchEvent) => { | |
| const touches = e.touches; | |
| if (touches.length === 1 && scale > 1 && isDragging) { | |
| // Pan | |
| wasDragging.current = true; | |
| const touch = touches[0]; | |
| if (!touch) return; | |
| requestAnimationFrame(() => { | |
| const newX = touch.clientX - dragStart.current.x; | |
| const newY = touch.clientY - dragStart.current.y; | |
| setPosition({ x: newX, y: newY }); | |
| }); | |
| } else if (touches.length === 2) { | |
| // Pinch | |
| wasDragging.current = true; | |
| const rect = containerRef.current?.getBoundingClientRect(); | |
| if (!rect) return; | |
| const touch1 = touches[0]; | |
| const touch2 = touches[1]; | |
| if (!touch1 || !touch2) return; | |
| const currentDistance = Math.hypot( | |
| touch1.clientX - touch2.clientX, | |
| touch1.clientY - touch2.clientY, | |
| ); | |
| const distanceChange = currentDistance / lastTouchDistance.current; | |
| requestAnimationFrame(() => { | |
| const newScale = Math.min(Math.max(scale * distanceChange, MIN_SCALE), MAX_SCALE); | |
| const newZoom = MOBILE_ZOOM_SPEED * ZOOM_BIAS * distanceChange; | |
| if (newScale <= 1) { | |
| setPosition({ x: 0, y: 0 }); | |
| setScale(newScale); | |
| setZoomSpeed(ZOOM_SPEED); | |
| return; | |
| } | |
| // Touch position relative to the container element | |
| const touchX = (touch1.clientX + touch2.clientX) / 2 - rect.left - rect.width / 2; | |
| const touchY = (touch1.clientY + touch2.clientY) / 2 - rect.top - rect.height / 2; | |
| setPosition((prevPos) => { | |
| return getZoomedOffset(touchX, touchY, scale, newScale, prevPos); | |
| }); | |
| setScale(newScale); | |
| setZoomSpeed(newZoom); | |
| lastTouchDistance.current = currentDistance; | |
| }); | |
| } | |
| }; | |
| const onTouchEnd = (e: React.TouchEvent) => { | |
| const touches = e.touches; | |
| if (touches.length === 1) { | |
| const touch = touches[0]; | |
| if (!touch) return; | |
| dragStart.current = { | |
| x: touch.clientX - position.x, | |
| y: touch.clientY - position.y, | |
| }; | |
| } | |
| if (touches.length === 0) { | |
| setIsDragging(false); | |
| } | |
| }; | |
| const handleReset = () => { | |
| setScale(1); | |
| setPosition({ x: 0, y: 0 }); | |
| setZoomSpeed(ZOOM_SPEED); | |
| hideZoomLabelAfterDelay(); | |
| }; | |
| const onDoubleClick = (e: React.MouseEvent) => { | |
| e.preventDefault(); | |
| e.stopPropagation(); | |
| const rect = containerRef.current?.getBoundingClientRect(); | |
| if (!rect) return; | |
| if (scale === 1) { | |
| const mouseX = e.clientX - rect.left - rect.width / 2; | |
| const mouseY = e.clientY - rect.top - rect.height / 2; | |
| const newScale = 2; | |
| setPosition((prevPos) => { | |
| return getZoomedOffset(mouseX, mouseY, scale, newScale, prevPos); | |
| }); | |
| setScale(newScale); | |
| hideZoomLabelAfterDelay(); | |
| } else { | |
| handleReset(); | |
| } | |
| }; | |
| const handleContainerClick = () => { | |
| if (wasDragging.current) { | |
| wasDragging.current = false; | |
| return; | |
| } | |
| onClose(); | |
| }; | |
| const handleImageClick = (e: React.MouseEvent) => { | |
| // Stop propagation to prevent closing when clicking on the image | |
| e.stopPropagation(); | |
| // Don't toggle label if user was dragging | |
| if (wasDragging.current) { | |
| wasDragging.current = false; | |
| return; | |
| } | |
| setShowZoomLabel((prev) => !prev); | |
| }; | |
| const cursorStyle = scale > 1 ? (isDragging ? 'grabbing' : 'grab') : 'default'; | |
| if (!src) return null; | |
| return ( | |
| <div | |
| ref={containerRef} | |
| tabIndex={-1} | |
| role='button' | |
| aria-label={_('Image viewer')} | |
| className='fixed inset-0 z-50 flex items-center justify-center outline-none' | |
| onKeyDown={handleKeyDown} | |
| onWheel={handleWheel} | |
| onTouchMove={onTouchMove} | |
| onTouchStart={onTouchStart} | |
| onTouchEnd={onTouchEnd} | |
| > | |
| <div | |
| role='button' | |
| tabIndex={0} | |
| className='not-eink:bg-black/50 eink:bg-base-100 not-eink:backdrop-blur-md absolute inset-0' | |
| onKeyDown={(e) => { | |
| if (e.key === 'Enter' || e.key === ' ') { | |
| onClose(); | |
| } | |
| }} | |
| /> | |
| <ZoomControls | |
| onClose={onClose} | |
| onZoomIn={handleZoomIn} | |
| onZoomOut={handleZoomOut} | |
| onReset={handleReset} | |
| /> | |
| {onPrevious && showZoomLabel && ( | |
| <button | |
| onClick={(e) => { | |
| e.stopPropagation(); | |
| handlePreviousImage(); | |
| }} | |
| className='eink-bordered absolute left-4 top-1/2 z-10 flex h-12 w-12 -translate-y-1/2 cursor-pointer items-center justify-center rounded-full bg-black/50 text-white transition-all duration-300 hover:bg-black/70' | |
| aria-label={_('Previous Image')} | |
| title={_('Previous Image')} | |
| > | |
| <IoChevronBack className='h-8 w-8' /> | |
| </button> | |
| )} | |
| {onNext && showZoomLabel && ( | |
| <button | |
| onClick={(e) => { | |
| e.stopPropagation(); | |
| handleNextImage(); | |
| }} | |
| className='eink-bordered absolute right-4 top-1/2 z-10 flex h-12 w-12 -translate-y-1/2 cursor-pointer items-center justify-center rounded-full bg-black/50 text-white transition-all duration-300 hover:bg-black/70' | |
| aria-label={_('Next Image')} | |
| title={_('Next Image')} | |
| > | |
| <IoChevronForward className='h-8 w-8' /> | |
| </button> | |
| )} | |
| <div | |
| role='none' | |
| className={clsx('relative flex h-full w-full items-center justify-center overflow-hidden')} | |
| onClick={handleContainerClick} | |
| > | |
| <Image | |
| src={decodeURIComponent(src)} | |
| ref={imageRef} | |
| alt={_('Zoomed')} | |
| className='transform-gpu select-none object-contain' | |
| draggable={false} | |
| width={0} | |
| height={0} | |
| sizes='100vw' | |
| onClick={handleImageClick} | |
| onMouseDown={handleImageMouseDown} | |
| onMouseMove={handleImageMouseMove} | |
| onMouseUp={handleImageMouseUp} | |
| onMouseLeave={handleImageMouseUp} | |
| onDoubleClick={onDoubleClick} | |
| style={{ | |
| width: 'auto', | |
| height: 'auto', | |
| maxWidth: '100%', | |
| maxHeight: '100%', | |
| transform: `scale(${scale}) translate(${position.x / scale}px, ${position.y / scale}px)`, | |
| transition: 'transform 0.05s ease-out', | |
| cursor: cursorStyle, | |
| }} | |
| /> | |
| </div> | |
| {showZoomLabel && ( | |
| <div | |
| aria-label={_('Zoom level')} | |
| className='zoom-level-label eink-bordered not-eink:text-white not-eink:bg-black/50 pointer-events-none absolute left-1/2 top-12 -translate-x-1/2 rounded-full px-3 py-1 text-sm transition-opacity duration-300' | |
| > | |
| {Math.round((scale * 100) / 5) * 5}% | |
| </div> | |
| )} | |
| </div> | |
| ); | |
| }; | |
| export default ImageViewer; | |