fix(lightbox): smooth carousel swipe + drop instructional hint (#348)
Two fixes for discussion #348. Carousel-style swipe The lightbox previously snapped to the next photo on swipe, then showed a loading spinner while the new image fetched — choppy compared with the reference video the reporter shared. The current photo is now rendered inside a 3-slide track (prev/current/next). As the finger drags, the track follows; on release the track animates to the neighbouring slot or springs back if the gesture didn't pass the threshold. Because the prev/next AuthenticatedImages render up front, the browser starts fetching them while the user is still on the current photo, so there's no loader flash on commit. - Phase machine ('idle' | 'dragging' | 'committing' | 'springing') drives the track's transform/transition. Commit + spring use a 280ms cubic-bezier ease. - Percentage-based transforms avoid measuring container width before the first paint. Commit threshold (read from the ref on demand) is max(60px, 20% of width) OR a fast flick (>0.5 px/ms with at least 40px of movement). - transitionend advances currentIndex with wrap-around and resets the track in one batch — slot contents rotate and the track snaps from the commit position back to centered with transition: none, so the visible image stays put. No flicker. - Vertical-cancel (>24px dy) abandons the drag and springs back so the user keeps the gesture they intended. - touch-action: none on the carousel container stops the browser fighting us with edge-swipe back navigation and native pinch-zoom. - Pinch starting mid-drag springs the track back smoothly so the image doesn't jerk under the second finger. - onTouchCancel covers system-interrupted gestures (incoming call etc). - dragX === 0 short-circuits to 'idle' instead of 'springing' so taps don't get stuck waiting for a transitionend that never fires. - Neighbour slides use a simplified AuthenticatedImage render (no canvas/fragment-grid pipeline) since they're only on screen during the swipe; the current slide keeps the full protection chain. - Neighbour videos render their thumbnail rather than spinning up a VideoPlayer. When the *current* photo is a video, the carousel is bypassed entirely — single VideoPlayer + no swipe handlers — because sliding a video element during a drag is awkward and adds nothing. - Removed the now-redundant imageLoaded state + spinner; AuthenticatedImage already shows a placeholder while loading. Keyboard arrows and the on-screen Prev/Next buttons still snap (no animation) — animating them would have required input queuing for fast double-presses, and the request was specifically about swipe. "Swipe to navigate" hint Removed the mobile-only overlay text. Swipe is universal in image viewers; the instruction read like training wheels and competed with the photo for attention.
This commit is contained in:
Paul Nothaft
@@ -1,6 +1,6 @@
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import React, { useState, useEffect, useRef } from 'react';
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import { useDevToolsProtection } from '../../hooks/useDevToolsProtection';
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import { X, ChevronLeft, ChevronRight, Download, ZoomIn, ZoomOut, MessageSquare, Heart, Star, Loader2 } from 'lucide-react';
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import { X, ChevronLeft, ChevronRight, Download, ZoomIn, ZoomOut, MessageSquare, Heart, Star } from 'lucide-react';
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import type { Photo } from '../../types';
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import { useDownloadPhoto } from '../../hooks/useGallery';
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import { AuthenticatedImage } from '../common';
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@@ -50,6 +50,21 @@ export const PhotoLightbox: React.FC<PhotoLightboxProps> = ({
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// Ref (not state) so handleTouchEnd reads the value set by handleTouchStart
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// even when both fire in the same render batch.
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const swipeStartRef = useRef<{ x: number; y: number; t: number } | null>(null);
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// Carousel swipe state. A 3-slide track (prev/current/next) is shifted
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// so the current slide is centered; the user's finger drags the track,
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// and the track snaps to the neighbour or springs back when released.
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// Percentage-based transforms avoid the need to measure the container
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// before the first paint.
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// - 'idle': showing the current slide, no transition
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// - 'dragging': finger is down, track follows the finger (no transition)
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// - 'committing': finger lifted past the threshold, animating to the
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// neighbouring slot. On transitionend we advance currentIndex and reset.
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// - 'springing': finger lifted below threshold, animating back to center.
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const trackContainerRef = useRef<HTMLDivElement>(null);
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const [dragX, setDragX] = useState(0);
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const [phase, setPhase] = useState<'idle' | 'dragging' | 'committing' | 'springing'>('idle');
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const [commitDirection, setCommitDirection] = useState<-1 | 1>(1);
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const [showFeedback, setShowFeedback] = useState(initialShowFeedback);
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const [isSmallScreen, setIsSmallScreen] = useState<boolean>(typeof window !== 'undefined' ? window.innerWidth < 640 : false);
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const [feedbackSettings, setFeedbackSettings] = useState<{
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@@ -66,7 +81,6 @@ export const PhotoLightbox: React.FC<PhotoLightboxProps> = ({
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const [savedIdentity, setSavedIdentity] = useState<{ name: string; email: string } | null>(null);
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const [showIdentityModal, setShowIdentityModal] = useState(false);
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const [pendingAction, setPendingAction] = useState<null | { type: 'like' | 'rating'; rating?: number }>(null);
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const [imageLoaded, setImageLoaded] = useState(false);
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const guestIdentity = useGuestIdentityOptional();
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const isGuestMode = guestIdentity?.identityMode === 'guest';
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@@ -76,11 +90,7 @@ export const PhotoLightbox: React.FC<PhotoLightboxProps> = ({
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return () => window.removeEventListener('resize', onResize);
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}, []);
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// Reset image loaded state when changing photos
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useEffect(() => {
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setImageLoaded(false);
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}, [currentIndex]);
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const downloadPhotoMutation = useDownloadPhoto();
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const currentPhoto = photos[currentIndex];
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@@ -365,8 +375,9 @@ export const PhotoLightbox: React.FC<PhotoLightboxProps> = ({
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}
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};
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// Touch event handlers: pinch-to-zoom (2 fingers) + single-finger swipe nav.
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// Swipe is suppressed while zoomed in so the user can pan instead.
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// Touch event handlers: pinch-to-zoom (2 fingers) + single-finger
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// carousel-style swipe nav. Swipe is suppressed while zoomed in so the
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// user can pan instead. The carousel is also disabled mid-animation.
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const handleTouchStart = (e: React.TouchEvent) => {
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if (e.touches.length === 2) {
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const touch1 = e.touches[0];
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@@ -377,9 +388,21 @@ export const PhotoLightbox: React.FC<PhotoLightboxProps> = ({
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);
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setTouchDistance(distance);
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swipeStartRef.current = null;
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} else if (e.touches.length === 1 && zoom <= 1) {
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// Cancel any in-progress carousel motion when a pinch starts —
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// spring the track back so the image doesn't jerk under the user.
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if (phase === 'dragging') {
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if (dragX === 0) {
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setPhase('idle');
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} else {
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setPhase('springing');
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setDragX(0);
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}
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}
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} else if (e.touches.length === 1 && zoom <= 1 && (phase === 'idle' || phase === 'dragging')) {
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const t = e.touches[0];
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swipeStartRef.current = { x: t.clientX, y: t.clientY, t: Date.now() };
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setPhase('dragging');
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setDragX(0);
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}
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};
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@@ -396,26 +419,124 @@ export const PhotoLightbox: React.FC<PhotoLightboxProps> = ({
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const newZoom = Math.max(1, Math.min(3, zoom * scale));
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setZoom(newZoom);
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setTouchDistance(newDistance);
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return;
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}
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if (phase === 'dragging' && e.touches.length === 1 && swipeStartRef.current) {
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const t = e.touches[0];
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const dx = t.clientX - swipeStartRef.current.x;
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const dy = t.clientY - swipeStartRef.current.y;
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// Cancel the carousel drag if the gesture turns out to be vertical
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// (e.g. an accidental scroll attempt while not zoomed). If we
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// haven't moved horizontally yet, snap straight to idle — there's
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// no transition to wait on — otherwise let the spring carry it back.
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if (Math.abs(dy) > Math.abs(dx) && Math.abs(dy) > 24) {
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swipeStartRef.current = null;
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if (dragX === 0) {
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setPhase('idle');
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} else {
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setPhase('springing');
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setDragX(0);
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}
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return;
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}
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setDragX(dx);
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}
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};
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const handleTouchEnd = (e: React.TouchEvent) => {
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setTouchDistance(null);
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const start = swipeStartRef.current;
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if (start && e.changedTouches.length > 0) {
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if (phase === 'dragging' && start && e.changedTouches.length > 0) {
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const t = e.changedTouches[0];
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const dx = t.clientX - start.x;
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const dy = t.clientY - start.y;
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const dt = Date.now() - start.t;
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// Horizontal swipe: > 50px and dominant over vertical, completed in < 600ms.
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if (Math.abs(dx) > 50 && Math.abs(dx) > Math.abs(dy) * 1.2 && dt < 600) {
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if (dx > 0) goToPrevious();
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else goToNext();
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const dt = Math.max(1, Date.now() - start.t);
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const velocity = Math.abs(dx) / dt; // px / ms
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const containerWidth = trackContainerRef.current?.offsetWidth ?? 0;
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const threshold = Math.max(60, containerWidth * 0.2);
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const isHorizontal = Math.abs(dx) > Math.abs(dy) * 1.2;
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const shouldCommit = isHorizontal && (Math.abs(dx) > threshold || (velocity > 0.5 && Math.abs(dx) > 40));
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if (shouldCommit) {
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setCommitDirection(dx < 0 ? 1 : -1);
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setDragX(dx);
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setPhase('committing');
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} else if (dragX === 0) {
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// Tap with no movement — no transition would fire, so skip the
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// springing phase to avoid getting stuck waiting for transitionend.
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setPhase('idle');
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} else {
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setPhase('springing');
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setDragX(0);
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}
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} else if (phase === 'dragging') {
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// Touch ended without changedTouches data (rare) — reset cleanly.
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setPhase('idle');
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setDragX(0);
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}
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swipeStartRef.current = null;
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};
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const handleTouchCancel = () => {
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// System took over the gesture (incoming call, edge swipe, etc.).
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// Spring back if the carousel was being dragged.
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if (phase === 'dragging') {
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if (dragX === 0) {
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setPhase('idle');
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} else {
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setPhase('springing');
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setDragX(0);
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}
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}
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swipeStartRef.current = null;
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setTouchDistance(null);
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};
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// Track transform. Percentages on translateX are self-referential (a
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// 300%-wide track translated -33.333% moves left by exactly one container
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// width), so we never need to know the container width to position the
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// slides. The drag delta is added in pixels.
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// - idle / springing target: -33.333% (current centered)
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// - dragging: -33.333% + dragX px (finger follows)
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// - committing next: -66.666% (next centered)
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// - committing prev: 0% (previous centered)
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const trackTransform = (() => {
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if (phase === 'dragging') return `translate3d(calc(-33.3333% + ${dragX}px), 0, 0)`;
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if (phase === 'committing') {
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return commitDirection === 1
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? 'translate3d(-66.6666%, 0, 0)'
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: 'translate3d(0%, 0, 0)';
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}
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return 'translate3d(-33.3333%, 0, 0)'; // idle | springing
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})();
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const trackTransition = phase === 'committing' || phase === 'springing'
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? 'transform 280ms cubic-bezier(0.22, 0.61, 0.36, 1)'
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: 'none';
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const handleTrackTransitionEnd = (e: React.TransitionEvent) => {
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if (e.propertyName !== 'transform') return;
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if (phase === 'committing') {
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if (commitDirection === 1) {
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setCurrentIndex((prev) => (prev < photos.length - 1 ? prev + 1 : 0));
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} else {
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setCurrentIndex((prev) => (prev > 0 ? prev - 1 : photos.length - 1));
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}
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setDragX(0);
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setPhase('idle');
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} else if (phase === 'springing') {
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setPhase('idle');
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}
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};
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const prevPhoto = photos.length > 1
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? photos[(currentIndex - 1 + photos.length) % photos.length]
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: null;
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const nextPhoto = photos.length > 1
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? photos[(currentIndex + 1) % photos.length]
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: null;
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// Apply protection class to the lightbox container
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const lightboxClass = useEnhancedProtection ?
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`fixed inset-0 bg-black z-50 flex items-center justify-center protected-image protection-${protectionLevel}` :
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@@ -566,93 +687,158 @@ export const PhotoLightbox: React.FC<PhotoLightboxProps> = ({
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</div>
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</div>
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{/* Image/Video container */}
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<div
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className="absolute top-0 left-0 bottom-0 flex items-center justify-center z-0"
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onClick={currentPhoto.media_type === 'video' ? undefined : handleImageClick}
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onMouseDown={currentPhoto.media_type === 'video' ? undefined : handleMouseDown}
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onMouseMove={currentPhoto.media_type === 'video' ? undefined : handleMouseMove}
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onMouseUp={currentPhoto.media_type === 'video' ? undefined : handleMouseUp}
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onMouseLeave={currentPhoto.media_type === 'video' ? undefined : handleMouseUp}
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onTouchStart={currentPhoto.media_type === 'video' ? undefined : handleTouchStart}
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onTouchMove={currentPhoto.media_type === 'video' ? undefined : handleTouchMove}
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onTouchEnd={currentPhoto.media_type === 'video' ? undefined : handleTouchEnd}
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style={{
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cursor: currentPhoto.media_type === 'video' ? 'default' : (zoom > 1 ? (isDragging ? 'grabbing' : 'grab') : 'default'),
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right: isDesktopFeedback ? `${desktopFeedbackWidth}px` : 0,
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}}
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>
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{/* Loading spinner */}
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{!imageLoaded && currentPhoto.media_type !== 'video' && (
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<div className="absolute inset-0 flex items-center justify-center z-10">
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<Loader2 className="w-12 h-12 text-white animate-spin" />
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</div>
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)}
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{/* Image/Video container.
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For photos this hosts a 3-slide carousel (prev/current/next) so
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swipe gestures animate the track and the neighbour images preload
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while the user views the current one. Videos still render as a
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single player — sliding video elements during a drag is awkward
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and the carousel adds nothing for that case. */}
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{(() => {
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const isVideoCurrent = currentPhoto.media_type === 'video';
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{currentPhoto.media_type === 'video' ? (
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<VideoPlayer
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src={currentPhoto.url}
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poster={currentPhoto.thumbnail_url}
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className="max-w-full max-h-full"
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controls={true}
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autoPlay={false}
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/>
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) : (
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<AuthenticatedImage
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src={currentPhoto.url}
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alt={currentPhoto.filename}
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fallbackSrc={currentPhoto.thumbnail_url || undefined}
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className="max-w-full max-h-full object-contain select-none"
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const renderSlide = (photo: Photo | null, isCurrent: boolean) => {
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// Reserve the slot even when there's no neighbour (single-photo
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// gallery) so the flex layout keeps slides aligned.
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if (!photo) {
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return <div className="h-full" style={{ flex: '0 0 33.3333%' }} aria-hidden="true" />;
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}
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// Neighbouring slides are plain thumbnails — they're only on
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// screen during the swipe animation, so we save the work of a
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// protected canvas pipeline for them. The current slide keeps
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// the full protection chain.
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if (!isCurrent) {
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return (
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<div className="h-full flex items-center justify-center px-2" style={{ flex: '0 0 33.3333%' }}>
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{photo.media_type === 'video' && photo.thumbnail_url ? (
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<img
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src={photo.thumbnail_url}
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alt={photo.filename}
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className="max-w-full max-h-full object-contain select-none pointer-events-none"
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draggable={false}
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/>
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) : (
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<AuthenticatedImage
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src={photo.url}
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alt={photo.filename}
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fallbackSrc={photo.thumbnail_url || undefined}
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className="max-w-full max-h-full object-contain select-none pointer-events-none"
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draggable={false}
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isGallery={true}
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slug={slug}
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photoId={photo.id}
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requiresToken={photo.requires_token}
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secureUrlTemplate={photo.secure_url_template}
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/>
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)}
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</div>
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);
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}
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return (
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<div
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className="h-full flex items-center justify-center"
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style={{ flex: '0 0 33.3333%' }}
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onClick={handleImageClick}
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>
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<AuthenticatedImage
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src={photo.url}
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alt={photo.filename}
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fallbackSrc={photo.thumbnail_url || undefined}
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className="max-w-full max-h-full object-contain select-none"
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style={{
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transform: `scale(${zoom}) translate(${dragOffset.x / zoom}px, ${dragOffset.y / zoom}px)`,
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transition: isDragging ? 'none' : 'transform 0.2s',
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}}
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draggable={false}
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useWatermark={useEnhancedProtection}
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watermarkText={useEnhancedProtection ? `${photo.filename} - Protected` : undefined}
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isGallery={true}
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slug={slug}
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photoId={photo.id}
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requiresToken={photo.requires_token}
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secureUrlTemplate={photo.secure_url_template}
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protectFromDownload={!allowDownloads || useEnhancedProtection}
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protectionLevel={protectionLevel}
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useEnhancedProtection={useEnhancedProtection}
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useCanvasRendering={useCanvasRendering || protectionLevel === 'maximum'}
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fragmentGrid={protectionLevel === 'enhanced' || protectionLevel === 'maximum'}
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blockKeyboardShortcuts={useEnhancedProtection}
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detectPrintScreen={useEnhancedProtection}
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detectDevTools={protectionLevel === 'enhanced' || protectionLevel === 'maximum'}
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onProtectionViolation={(violationType) => {
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console.warn(`Protection violation in lightbox for photo ${photo.id}: ${violationType}`);
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if (typeof window !== 'undefined' && (window as any).umami) {
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(window as any).umami.track('lightbox_protection_violation', {
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photoId: photo.id,
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violationType,
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protectionLevel,
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zoom
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});
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}
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if (protectionLevel === 'maximum' &&
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['devtools_detected', 'print_screen_detected', 'canvas_access_blocked'].includes(violationType)) {
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onClose();
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}
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}}
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/>
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</div>
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);
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};
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return (
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<div
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ref={trackContainerRef}
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className="absolute top-0 left-0 bottom-0 overflow-hidden z-0"
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onClick={isVideoCurrent ? undefined : handleImageClick}
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onMouseDown={isVideoCurrent ? undefined : handleMouseDown}
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onMouseMove={isVideoCurrent ? undefined : handleMouseMove}
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onMouseUp={isVideoCurrent ? undefined : handleMouseUp}
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onMouseLeave={isVideoCurrent ? undefined : handleMouseUp}
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onTouchStart={isVideoCurrent ? undefined : handleTouchStart}
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onTouchMove={isVideoCurrent ? undefined : handleTouchMove}
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onTouchEnd={isVideoCurrent ? undefined : handleTouchEnd}
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onTouchCancel={isVideoCurrent ? undefined : handleTouchCancel}
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style={{
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transform: `scale(${zoom}) translate(${dragOffset.x / zoom}px, ${dragOffset.y / zoom}px)`,
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transition: isDragging ? 'none' : 'transform 0.2s',
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opacity: imageLoaded ? 1 : 0,
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cursor: isVideoCurrent ? 'default' : (zoom > 1 ? (isDragging ? 'grabbing' : 'grab') : 'default'),
|
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right: isDesktopFeedback ? `${desktopFeedbackWidth}px` : 0,
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// Tell the browser we handle horizontal gestures ourselves so
|
||||
// it doesn't fight us with edge-swipe back navigation, native
|
||||
// pinch-zoom, etc. Videos keep default touch behaviour.
|
||||
touchAction: isVideoCurrent ? 'auto' : 'none',
|
||||
}}
|
||||
draggable={false}
|
||||
onLoad={() => setImageLoaded(true)}
|
||||
useWatermark={useEnhancedProtection}
|
||||
watermarkText={useEnhancedProtection ? `${currentPhoto.filename} - Protected` : undefined}
|
||||
isGallery={true}
|
||||
slug={slug}
|
||||
photoId={currentPhoto.id}
|
||||
requiresToken={currentPhoto.requires_token}
|
||||
secureUrlTemplate={currentPhoto.secure_url_template}
|
||||
protectFromDownload={!allowDownloads || useEnhancedProtection}
|
||||
protectionLevel={protectionLevel}
|
||||
useEnhancedProtection={useEnhancedProtection}
|
||||
useCanvasRendering={useCanvasRendering || protectionLevel === 'maximum'}
|
||||
fragmentGrid={protectionLevel === 'enhanced' || protectionLevel === 'maximum'}
|
||||
blockKeyboardShortcuts={useEnhancedProtection}
|
||||
detectPrintScreen={useEnhancedProtection}
|
||||
detectDevTools={protectionLevel === 'enhanced' || protectionLevel === 'maximum'}
|
||||
onProtectionViolation={(violationType) => {
|
||||
console.warn(`Protection violation in lightbox for photo ${currentPhoto.id}: ${violationType}`);
|
||||
|
||||
// Track analytics
|
||||
if (typeof window !== 'undefined' && (window as any).umami) {
|
||||
(window as any).umami.track('lightbox_protection_violation', {
|
||||
photoId: currentPhoto.id,
|
||||
violationType,
|
||||
protectionLevel,
|
||||
zoom
|
||||
});
|
||||
}
|
||||
|
||||
// For maximum protection, close lightbox on violation
|
||||
if (protectionLevel === 'maximum' &&
|
||||
['devtools_detected', 'print_screen_detected', 'canvas_access_blocked'].includes(violationType)) {
|
||||
onClose();
|
||||
}
|
||||
}}
|
||||
/>
|
||||
)}
|
||||
</div>
|
||||
|
||||
{/* Touch/swipe hint for mobile. Sits above the bottom toolbar
|
||||
(which can wrap to two rows when feedback controls are enabled). */}
|
||||
<div className="absolute bottom-40 left-1/2 -translate-x-1/2 text-white text-sm opacity-50 pointer-events-none md:hidden z-20">
|
||||
Swipe to navigate
|
||||
</div>
|
||||
>
|
||||
{isVideoCurrent ? (
|
||||
<div className="w-full h-full flex items-center justify-center">
|
||||
<VideoPlayer
|
||||
src={currentPhoto.url}
|
||||
poster={currentPhoto.thumbnail_url}
|
||||
className="max-w-full max-h-full"
|
||||
controls={true}
|
||||
autoPlay={false}
|
||||
/>
|
||||
</div>
|
||||
) : (
|
||||
<div
|
||||
className="absolute inset-0 flex items-stretch"
|
||||
style={{
|
||||
width: '300%',
|
||||
transform: trackTransform,
|
||||
transition: trackTransition,
|
||||
willChange: 'transform',
|
||||
}}
|
||||
onTransitionEnd={handleTrackTransitionEnd}
|
||||
>
|
||||
{renderSlide(prevPhoto, false)}
|
||||
{renderSlide(currentPhoto, true)}
|
||||
{renderSlide(nextPhoto, false)}
|
||||
</div>
|
||||
)}
|
||||
</div>
|
||||
);
|
||||
})()}
|
||||
|
||||
{/* Feedback Panel */}
|
||||
{showFeedback && (
|
||||
|
||||
Reference in New Issue
Block a user