Vito
590aa2cd0e
* feat(workspace): add native image browsing and continuous loading * test(workspace): assert empty collections through their status * fix(workspace): rescan refreshed images and expose ancestor folders
43 lines
2.1 KiB
JavaScript
43 lines
2.1 KiB
JavaScript
export function layoutImages(images, width, mode, minWidth = 240) {
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const gap = 16;
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const columns = mode === 'list' ? 1 : Math.max(1, Math.floor((width + gap) / (minWidth + gap)));
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const cardWidth = Math.max(1, (width - gap * (columns - 1)) / columns);
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const bottoms = Array(columns).fill(0);
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let maxHeight = 0;
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const positions = images.map((image, index) => {
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const column = mode === 'masonry' ? bottoms.indexOf(Math.min(...bottoms)) : index % columns;
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const ratio = image.width > 0 && image.height > 0 ? image.width / image.height : 4 / 3;
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const height = mode === 'list' ? 106 :
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(mode === 'masonry' ? Math.max(130, Math.min(440, cardWidth / ratio)) : cardWidth * .75) + 72;
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maxHeight = Math.max(maxHeight, height);
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const y = mode === 'grid' ? Math.floor(index / columns) * (height + gap) : bottoms[column];
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bottoms[column] = y + height + gap;
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return { x: column * (cardWidth + gap), y, width: cardWidth, height };
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});
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return { positions, height: Math.max(0, ...bottoms) - (images.length ? gap : 0), maxHeight };
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}
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export function visibleImages(positions, top, viewportHeight, focusedIndex = -1, maxHeight = 1024) {
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const buffer = Math.max(600, viewportHeight);
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const firstTop = top - buffer - maxHeight;
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const lastTop = top + viewportHeight + buffer;
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let low = 0, high = positions.length;
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// Every layout emits monotonically increasing tops, including shortest-column masonry.
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while (low < high) {
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const middle = Math.floor((low + high) / 2);
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if (positions[middle].y < firstTop) low = middle + 1;
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else high = middle;
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}
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const indexes = [];
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for (let index = low; index < positions.length; index++) {
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const position = positions[index];
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if (position.y > lastTop) break;
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if (index === focusedIndex || position.y + position.height >= top - buffer) indexes.push(index);
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}
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if (focusedIndex >= 0 && focusedIndex < positions.length && !indexes.includes(focusedIndex)) {
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indexes.push(focusedIndex);
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indexes.sort((a, b) => a - b);
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}
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return indexes;
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}
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