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Gallery View Zooming and Panning Feature #1596

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Gallery View Zooming and Panning Feature #1596

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87 changes: 84 additions & 3 deletions frontend/src/pages/SearchPages/searchResultTabs/ImageGalleryModal.jsx
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,50 @@ export const ImageGalleryModal = observer(
const imgRef = useRef(null);
const [scaleX, setScaleX] = useState(1);
const [scaleY, setScaleY] = useState(1);
const [pan, setPan] = useState({ x: 0, y: 0 });
const [zoom, setZoom] = useState(1);
const [dragStart, setDragStart] = useState(null);

const safeIndex = Math.min(Math.max(index, 0), assets.length - 1);
const a = assets[safeIndex] || {};

useEffect(() => {
setPan({ x: 0, y: 0 });
}, [zoom, safeIndex]);

const onMouseDown = (e) => {
if (e.button !== 0) return;
if (zoom <= 1) return;
e.preventDefault();
setDragStart({ x: e.clientX, y: e.clientY, startPan: pan });
};

useEffect(() => {
if (!dragStart) return;

const handleMouseMove = (e) => {
const dx = e.clientX - dragStart.x;
const dy = e.clientY - dragStart.y;
setPan({
x: dragStart.startPan.x + dx,
y: dragStart.startPan.y + dy,
});
};

const handleMouseUp = () => {
setDragStart(null);
};

window.addEventListener("mousemove", handleMouseMove);
window.addEventListener("mouseup", handleMouseUp);
document.body.style.userSelect = "none";

return () => {
window.removeEventListener("mousemove", handleMouseMove);
window.removeEventListener("mouseup", handleMouseUp);
document.body.style.userSelect = "";
};
}, [dragStart]);

const encounterData = assets[index] || {};

Expand All @@ -28,9 +72,6 @@ export const ImageGalleryModal = observer(

if (!open || !assets.length) return null;

const safeIndex = Math.min(Math.max(index, 0), assets.length - 1);
const a = assets[safeIndex] || {};

return (
<div
id="image-modal"
Expand Down Expand Up @@ -73,6 +114,34 @@ export const ImageGalleryModal = observer(
marginLeft: "auto",
}}
>
<button
type="button"
className="btn btn-sm rounded-circle"
style={{
backgroundColor: "rgba(255, 255, 255, 0.5)",
marginRight: "8px",
color: "white",
}}
onClick={() => setZoom((z) => Math.min(3, z + 0.25))}
title="Zoom In"
>
<i className="bi bi-zoom-in"></i>
</button>

<button
type="button"
className="btn btn-sm rounded-circle"
style={{
backgroundColor: "rgba(255, 255, 255, 0.5)",
marginRight: "8px",
color: "white",
}}
onClick={() => setZoom(1)}
title="Reset Zoom"
>
<i className="bi bi-zoom-out"></i>
</button>

<button
type="button"
className="btn btn-sm rounded-circle"
Expand Down Expand Up @@ -144,6 +213,7 @@ export const ImageGalleryModal = observer(
id="image-modal-main-image"
src={a.url}
ref={imgRef}
onMouseDown={onMouseDown}
alt={`asset-${a.id ?? safeIndex}`}
className="img-fluid"
style={{
Expand All @@ -154,6 +224,17 @@ export const ImageGalleryModal = observer(
height: "auto",
objectFit: "contain",
margin: "0 auto",
transform: `translate(${pan.x}px, ${pan.y}px) scale(${zoom})`,
transformOrigin: "center center",
transition: dragStart ? "none" : "transform 0.2s ease",
position: "relative",
overflow: "hidden",
cursor:
zoom > 1
? dragStart
? "grabbing"
: "grab"
: "default",
}}
onLoad={() => {
const iw = imgRef.current?.clientWidth || 1;
Expand Down