fix right-hand spacing for portrait last images

src/components/images/Gallery/index.tsx

@@ -19,6 +19,7 @@ import {useAnalytics} from '#/analytics'
 
 const CONTAINER_ASPECT_RATIO = 3 / 2
 const ITEM_GAP = 8 // tokens.space.sm
+const MIN_PEEK = 40
 
 interface GalleryProps {
   images: AppBskyEmbedImages.ViewImage[]
@@ -76,16 +77,21 @@ export function Gallery({
     ? windowWidth - insetLeft - containerWidth
     : QUOTE_PADDING
 
-  const getItemWidth = (image: AppBskyEmbedImages.ViewImage) => {
+  const getItemWidth = (image: AppBskyEmbedImages.ViewImage, index: number) => {
     const ar = image.aspectRatio
+    let width = containerHeight // default to square-ish
     if (ar && ar.width > 0 && ar.height > 0) {
       const ratio = ar.width / ar.height
       // Width derived from image's own aspect ratio at the fixed container height
       // Clamp aspect ratio between 2:3 (portrait) and 3:2 (landscape)
       const clamped = Math.max(2 / 3, Math.min(ratio, 3 / 2))
-      return containerHeight * clamped
+      width = containerHeight * clamped
     }
-    return containerHeight // default to square-ish
+    // Ensure the first image leaves room for a peek of the next
+    if (index === 0 && images.length > 1) {
+      width = Math.min(width, containerWidth - MIN_PEEK)
+    }
+    return width
   }
 
   if (screenReaderEnabled) {
@@ -170,6 +176,8 @@ export function Gallery({
             pagingEnabled={false}
             showsHorizontalScrollIndicator={false}
             decelerationRate={0.993}
+            directionalLockEnabled
+            alwaysBounceVertical={false}
             style={{
               width: bleed ? windowWidth : containerWidth + QUOTE_PADDING * 2,
               height: containerHeight,
@@ -186,7 +194,7 @@ export function Gallery({
               let accumulated = insetLeft // account for left content padding
               let page = 0
               for (let i = 0; i < images.length; i++) {
-                const w = getItemWidth(images[i]) + ITEM_GAP
+                const w = getItemWidth(images[i], i) + ITEM_GAP
                 if (offsetX < accumulated + w / 2) {
                   page = i
                   break
@@ -211,7 +219,7 @@ export function Gallery({
                 collapsable={false}
                 style={[
                   {
-                    width: getItemWidth(image),
+                    width: getItemWidth(image, index),
                     height: containerHeight,
                   },
                 ]}>

src/components/images/Gallery/index.web.tsx

@@ -16,6 +16,7 @@ import {useAnalytics} from '#/analytics'
 
 const CONTAINER_ASPECT_RATIO = 3 / 2
 const ITEM_GAP = 8
+const MIN_PEEK = 40
 
 interface GalleryProps {
   images: AppBskyEmbedImages.ViewImage[]
@@ -65,20 +66,25 @@ export function Gallery({
   const containerHeight =
     containerWidth > 0 ? containerWidth / CONTAINER_ASPECT_RATIO : 0
 
-  const getItemWidth = (image: AppBskyEmbedImages.ViewImage) => {
+  const getItemWidth = (image: AppBskyEmbedImages.ViewImage, index: number) => {
     const ar = image.aspectRatio
+    let width = containerHeight
     if (ar && ar.width > 0 && ar.height > 0) {
       const ratio = ar.width / ar.height
       const clamped = Math.max(2 / 3, Math.min(ratio, 3 / 2))
-      return containerHeight * clamped
+      width = containerHeight * clamped
     }
-    return containerHeight
+    // Ensure the first image leaves room for a peek of the next
+    if (index === 0 && images.length > 1) {
+      width = Math.min(width, containerWidth - MIN_PEEK)
+    }
+    return width
   }
 
   // Embla carousel
   const [emblaRef, emblaApi] = useEmblaCarousel({
     align: () => insetLeftRef.current,
-    containScroll: false,
+    containScroll: 'trimSnaps',
     dragFree: true,
   })
 
@@ -96,9 +102,17 @@ export function Gallery({
         currentPageRef.current = page
       }
     }
+    const onDragStart = () => setIsDragging(true)
+    const onDragEnd = () => setIsDragging(false)
     emblaApi.on('select', onSelect)
+    emblaApi.on('pointerDown', onDragStart)
+    emblaApi.on('pointerUp', onDragEnd)
+    emblaApi.on('settle', onDragEnd)
     return () => {
       emblaApi.off('select', onSelect)
+      emblaApi.off('pointerDown', onDragStart)
+      emblaApi.off('pointerUp', onDragEnd)
+      emblaApi.off('settle', onDragEnd)
     }
   }, [emblaApi, ax, images.length])
 
@@ -110,6 +124,7 @@ export function Gallery({
   // Suppress click after drag
   const pointerDown = useRef(false)
   const dragged = useRef(false)
+  const [isDragging, setIsDragging] = useState(false)
 
   useEffect(() => {
     if (!emblaApi) return
@@ -206,31 +221,32 @@ export function Gallery({
             ref={emblaRef}
             style={{
               overflow: 'visible',
-              width: isBleed ? containerWidth + insetLeft : '100%',
+              width: isBleed ? containerWidth + insetLeft + insetRight : '100%',
               height: containerHeight,
-              cursor: 'grab',
+              cursor: isDragging ? 'grabbing' : 'grab',
+              userSelect: 'none',
             }}>
             <div
               style={{
                 display: 'flex',
                 gap: ITEM_GAP,
-                paddingLeft: isWithinQuote ? QUOTE_PADDING : 0,
+                paddingLeft: isWithinQuote ? QUOTE_PADDING : insetLeft,
                 paddingRight: isWithinQuote ? QUOTE_PADDING : 0,
                 height: containerHeight,
               }}>
               {images.map((image, index) => (
-                <div
+                <Slide
                   key={index}
-                  style={{
+                  width={getItemWidth(image, index)}
-                    flex: `0 0 ${getItemWidth(image)}px`,
+                  height={containerHeight}>
-                    minWidth: 0,
-                    height: containerHeight,
-                  }}>
                   <View
                     ref={containerRefs[index]}
                     collapsable={false}
                     style={[
-                      {width: getItemWidth(image), height: containerHeight},
+                      {
+                        width: getItemWidth(image, index),
+                        height: containerHeight,
+                      },
                     ]}
                     aria-roledescription="slide"
                     aria-label={
@@ -314,8 +330,17 @@ export function Gallery({
                       </View>
                     ) : null}
                   </View>
-                </div>
+                </Slide>
               ))}
+              {isBleed && insetRight > 0 && (
+                <div
+                  aria-hidden
+                  style={{
+                    flex: `0 0 ${Math.max(0, insetRight - ITEM_GAP)}px`,
+                    minWidth: 0,
+                  }}
+                />
+              )}
             </div>
           </div>
         </div>
@@ -323,3 +348,31 @@ export function Gallery({
     </View>
   )
 }
+
+function Slide({
+  width,
+  height,
+  children,
+}: {
+  width: number
+  height: number
+  children: React.ReactNode
+}) {
+  const [pressed, setPressed] = useState(false)
+  return (
+    <div
+      onPointerDown={() => setPressed(true)}
+      onPointerUp={() => setPressed(false)}
+      onPointerLeave={() => setPressed(false)}
+      onPointerMove={() => setPressed(false)}
+      style={{
+        flex: `0 0 ${width}px`,
+        minWidth: 0,
+        height,
+        transition: 'transform 0.15s ease-out',
+        transform: pressed ? 'scale(0.975)' : undefined,
+      }}>
+      {children}
+    </div>
+  )
+}