previewzoomoverlay
This commit is contained in:
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import React, { useCallback, useEffect, useMemo, useRef, useState } from 'react';
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import { createPortal } from 'react-dom';
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import { ArrowLeftIcon, ArrowRightIcon } from '../ui/icons';
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const noop = () => {};
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const clamp = (value, min, max) => {
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if (value < min) return min;
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if (value > max) return max;
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return value;
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};
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const ensureDocumentRoot = () => {
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if (typeof document === 'undefined') {
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return null;
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}
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return document.body;
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};
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const PreviewZoomOverlay = ({ open = false, display = null, onClose = noop }) => {
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const portalTarget = ensureDocumentRoot();
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const isActive = Boolean(open && display?.url && portalTarget);
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const stageRef = useRef(null);
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const imageMetricsRef = useRef({ naturalWidth: 0, naturalHeight: 0 });
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const dragRef = useRef(null);
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const skipClickRef = useRef(false);
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const [isNativeScale, setIsNativeScale] = useState(false);
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const [pan, setPan] = useState({ x: 0, y: 0 });
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const [isDragging, setIsDragging] = useState(false);
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const resetInteraction = useCallback(() => {
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setIsNativeScale(false);
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setPan({ x: 0, y: 0 });
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setIsDragging(false);
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dragRef.current = null;
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skipClickRef.current = false;
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imageMetricsRef.current = { naturalWidth: 0, naturalHeight: 0 };
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}, []);
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useEffect(() => {
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if (!open) {
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resetInteraction();
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}
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}, [open, resetInteraction]);
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useEffect(() => {
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if (!isActive) {
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return;
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}
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resetInteraction();
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}, [isActive, display?.url, resetInteraction]);
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const clampPan = useCallback(
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(x, y) => {
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const stage = stageRef.current;
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const { naturalWidth, naturalHeight } = imageMetricsRef.current;
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if (!stage || !naturalWidth || !naturalHeight) {
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return { x: 0, y: 0 };
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}
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const stageRect = stage.getBoundingClientRect();
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if (stageRect.width <= 0 || stageRect.height <= 0) {
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return { x: 0, y: 0 };
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}
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const imageWidth = isNativeScale
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? naturalWidth
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: Math.min(naturalWidth, stageRect.width);
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const imageHeight = isNativeScale
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? naturalHeight
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: Math.min(naturalHeight, stageRect.height);
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const limitX = Math.max(0, (imageWidth - stageRect.width) / 2);
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const limitY = Math.max(0, (imageHeight - stageRect.height) / 2);
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return {
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x: clamp(x, -limitX, limitX),
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y: clamp(y, -limitY, limitY),
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};
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},
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[isNativeScale],
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);
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const handleBackdropClick = useCallback(() => {
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onClose();
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}, [onClose]);
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const handleStageClick = useCallback((event) => {
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event.stopPropagation();
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}, []);
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const handleImageLoad = useCallback(
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(event) => {
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imageMetricsRef.current = {
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naturalWidth: event.currentTarget.naturalWidth || 0,
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naturalHeight: event.currentTarget.naturalHeight || 0,
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};
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setPan((current) => {
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const clamped = clampPan(current.x, current.y);
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if (clamped.x === current.x && clamped.y === current.y) {
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return current;
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}
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return clamped;
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});
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},
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[clampPan],
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);
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const handleImageClick = useCallback(
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(event) => {
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event.stopPropagation();
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if (skipClickRef.current) {
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skipClickRef.current = false;
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return;
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}
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if (!isNativeScale) {
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const stage = stageRef.current;
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const { naturalWidth, naturalHeight } = imageMetricsRef.current;
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if (stage && naturalWidth && naturalHeight) {
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const stageRect = stage.getBoundingClientRect();
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const imageRect = event.currentTarget.getBoundingClientRect();
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const clickX = event.clientX - imageRect.left;
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const clickY = event.clientY - imageRect.top;
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const ratioX = imageRect.width ? clickX / imageRect.width : 0.5;
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const ratioY = imageRect.height ? clickY / imageRect.height : 0.5;
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const focusX = naturalWidth * ratioX;
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const focusY = naturalHeight * ratioY;
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const halfWidth = naturalWidth / 2;
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const halfHeight = naturalHeight / 2;
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const limitX = Math.max(0, (naturalWidth - stageRect.width) / 2);
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const limitY = Math.max(0, (naturalHeight - stageRect.height) / 2);
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const targetPanX = clamp(-(focusX - halfWidth), -limitX, limitX);
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const targetPanY = clamp(-(focusY - halfHeight), -limitY, limitY);
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setPan({ x: targetPanX, y: targetPanY });
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} else {
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setPan({ x: 0, y: 0 });
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}
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setIsNativeScale(true);
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} else {
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setIsNativeScale(false);
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}
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},
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[isNativeScale],
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);
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const endDrag = useCallback(() => {
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dragRef.current = null;
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setIsDragging(false);
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}, []);
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const handlePointerDown = useCallback(
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(event) => {
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if (!isNativeScale || event.button !== 0) {
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return;
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}
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event.preventDefault();
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skipClickRef.current = false;
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dragRef.current = {
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pointerId: event.pointerId,
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originX: pan.x,
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originY: pan.y,
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startX: event.clientX,
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startY: event.clientY,
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moved: false,
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};
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event.currentTarget.setPointerCapture(event.pointerId);
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},
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[isNativeScale, pan.x, pan.y],
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);
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const handlePointerMove = useCallback(
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(event) => {
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const drag = dragRef.current;
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if (!drag || drag.pointerId !== event.pointerId) {
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return;
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}
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const deltaX = event.clientX - drag.startX;
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const deltaY = event.clientY - drag.startY;
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if (!drag.moved && (Math.abs(deltaX) > 2 || Math.abs(deltaY) > 2)) {
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drag.moved = true;
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setIsDragging(true);
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}
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if (drag.moved) {
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const clamped = clampPan(drag.originX + deltaX, drag.originY + deltaY);
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setPan((current) =>
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current.x === clamped.x && current.y === clamped.y ? current : clamped,
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);
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}
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},
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[clampPan],
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);
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const handlePointerUp = useCallback(
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(event) => {
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const drag = dragRef.current;
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if (!drag || drag.pointerId !== event.pointerId) {
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return;
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}
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event.currentTarget.releasePointerCapture(event.pointerId);
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skipClickRef.current = Boolean(drag.moved);
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endDrag();
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},
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[endDrag],
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);
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const handlePointerCancel = useCallback(
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(event) => {
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const drag = dragRef.current;
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if (!drag || drag.pointerId !== event.pointerId) {
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return;
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}
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event.currentTarget.releasePointerCapture(event.pointerId);
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skipClickRef.current = true;
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endDrag();
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},
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[endDrag],
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);
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const handleWheel = useCallback(
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(event) => {
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if (!isNativeScale) {
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return;
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}
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const deltaX = Number.isFinite(event.deltaX) ? event.deltaX : 0;
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const deltaY = Number.isFinite(event.deltaY) ? event.deltaY : 0;
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if (!deltaX && !deltaY) {
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return;
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}
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let updated = false;
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setPan((current) => {
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const clamped = clampPan(current.x - deltaX, current.y - deltaY);
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if (clamped.x === current.x && clamped.y === current.y) {
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return current;
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}
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updated = true;
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return clamped;
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});
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if (updated) {
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event.preventDefault();
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event.stopPropagation();
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}
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},
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[isNativeScale, clampPan],
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);
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useEffect(() => {
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if (!isActive) {
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return undefined;
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}
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const handleKeyDown = (event) => {
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if (event.key === 'Escape') {
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event.preventDefault();
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event.stopPropagation();
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onClose();
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return;
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}
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if (event.key === 'ArrowLeft') {
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event.preventDefault();
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event.stopPropagation();
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if (display?.canGoPrev && display?.goPrev) {
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display.goPrev();
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}
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return;
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}
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if (event.key === 'ArrowRight') {
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event.preventDefault();
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event.stopPropagation();
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if (display?.canGoNext && display?.goNext) {
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display.goNext();
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}
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}
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};
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window.addEventListener('keydown', handleKeyDown);
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return () => window.removeEventListener('keydown', handleKeyDown);
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}, [isActive, display, onClose]);
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const imageStyle = useMemo(() => {
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if (!isNativeScale) {
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return {
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cursor: 'zoom-in',
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transform: 'none',
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maxWidth: '95vw',
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maxHeight: '95vh',
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};
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}
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const { naturalWidth, naturalHeight } = imageMetricsRef.current;
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return {
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cursor: isDragging ? 'grabbing' : 'grab',
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width: naturalWidth ? `${naturalWidth}px` : 'auto',
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height: naturalHeight ? `${naturalHeight}px` : 'auto',
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maxWidth: 'none',
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maxHeight: 'none',
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transform: `translate3d(${pan.x}px, ${pan.y}px, 0)`,
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};
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}, [isNativeScale, pan.x, pan.y, isDragging]);
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const stageClassName = useMemo(
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() =>
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[
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'preview-zoom__stage',
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isNativeScale ? 'preview-zoom__stage--native' : '',
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isDragging ? 'preview-zoom__stage--dragging' : '',
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]
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.filter(Boolean)
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.join(' '),
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[isNativeScale, isDragging],
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);
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if (!isActive) {
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return null;
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}
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return createPortal(
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(
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<div
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className="preview-zoom-backdrop"
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role="dialog"
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aria-modal="true"
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aria-label="Enlarged document preview"
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onClick={handleBackdropClick}
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>
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<div
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ref={stageRef}
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className={stageClassName}
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onClick={handleStageClick}
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onWheel={handleWheel}
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>
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<img
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src={display?.url}
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alt={display?.alt || 'Document preview'}
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className="preview-zoom__image"
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style={imageStyle}
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onLoad={handleImageLoad}
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onClick={handleImageClick}
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onPointerDown={handlePointerDown}
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onPointerMove={handlePointerMove}
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onPointerUp={handlePointerUp}
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onPointerCancel={handlePointerCancel}
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draggable={false}
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/>
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<div className="preview-zoom__nav">
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<button
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type="button"
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className="preview-zoom__nav-button"
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onClick={(event) => {
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event.stopPropagation();
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if (display?.goPrev) {
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display.goPrev();
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}
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}}
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aria-label="Previous preview"
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disabled={!display?.canGoPrev}
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>
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<ArrowLeftIcon />
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</button>
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<button
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type="button"
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className="preview-zoom__nav-button"
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onClick={(event) => {
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event.stopPropagation();
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if (display?.goNext) {
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display.goNext();
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}
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}}
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aria-label="Next preview"
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disabled={!display?.canGoNext}
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>
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<ArrowRightIcon />
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</button>
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</div>
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</div>
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</div>
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),
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portalTarget,
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);
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};
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export default PreviewZoomOverlay;
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Reference in New Issue
Block a user