deepseek-harness/packages/client/ui-attachment

@deepseek-ai/dsh-client-ui-attachment

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Pure React attachment atoms (zero cordis): the composer draft-image rail (AttachmentRail), the chat-history image gallery (MessageImage/ImageGallery), the original-image lightbox (ImageLightbox), and the full-page drop overlay (DropOverlay). Every string arrives through label props resolved by the owning plugin's own locale namespace, and nothing here reads application state; @deepseek-ai/dsh-client-ui-conversation is the current consumer, bridging its conversation dictionary through its image-labels module.

Attachment rail

AttachmentRail renders pending draft images as fixed 64px thumbnails (16px radius) in one horizontally scrolling row whose scrollbar stays hidden. Overflow is announced by circular edge arrows instead: each pages one viewport (minus one card of context, floored at 200px) with smooth scrolling (instant under prefers-reduced-motion: reduce), and arrow visibility is recomputed from scroll geometry on scroll, item-count changes, and rail size changes (a ResizeObserver on the rail element, so sidebar and panel resizes count, not only window resizes). The rail scrolls horizontally only: a non-passive listener consumes every wheel tick with a vertical component — nothing scrolls the conversation behind the composer — converting a pure vertical wheel to a horizontal step (LINE/PAGE deltas normalized to pixels, per-tick travel clamped to 60px) and keeping a diagonal pan's horizontal intent, while purely horizontal pans stay native. A newly added item is revealed at the rail's end; removal keeps the scroll position, and a rail that mounts over an already-populated draft keeps its start position. Each thumbnail opens its original through onOpen on a single click, and its remove control sits inside the card's top-right corner, hidden until the card is hovered or the control keyboard-focused; coarse-pointer (touch) surfaces show it permanently because they have no hover. The owner decides mounting and renders the rail only while items exist.

Message images and the lightbox

MessageImage renders one durable history image, loading a session-authorized URL through the owner's ImageLoader; a failed load renders an explicit retry control, and a settled load answers a single click by opening ImageLightbox (clicks during loading are ignored). Sizing follows DeepSeek Chat: a message's lone image (variant="single") renders at 240px on its longer edge with the displayed aspect ratio clamped to [0.25, 4] — the overflow is cropped by object-fit: cover, anchored to the top of very tall images and the left of very wide ones — and never upscales past its natural size; an image among several (variant="tile") is a fixed 64px square. ImageGallery wraps a message's images in one aligned wrapping flex group (end for user messages, start for assistant messages), picks the variant from the image count, and renders nothing for an empty list. ImageLightbox is a document-level modal preview over the shared dialog mask (--dsw-alias-bg-mask-1 + --dsw-mask-blur, painted on its own layer so the blur never touches the previewed image) that closes on Escape, a mask press, or its close control, and restores focus to its opener on unmount.

Drop overlay

DropOverlay is the full-viewport invitation shown while a file drag is over the page: illustration, title, and a limits line while drops are accepted (disabled swaps the blocked illustration and hides the limits line). The layer is pointer-inert — the owner's document-level drag listeners keep the enter/leave count and decide accept/reject; the overlay only shows state. It portals to the body like the lightbox.

Model Experience

None, as the package renders pure React atoms in the browser; nothing here reaches a model request.

KV Cache effect

None; this package neither assembles nor sends a provider request.

Known Limitations and Deferred Work

• Images only — non-image files have no rail card or history renderer yet; DeepSeek Chat-style file cards and upload-progress states wait until the composer accepts non-image attachments.
• No zoom or download in the lightbox — the preview renders the original at fit-to-viewport size only.
• The lightbox does not trap focus — it sets aria-modal and restores focus on close, but Tab can reach the page behind it (behavior carried over from the pre-package component).