90 lines
3.3 KiB
TypeScript
90 lines
3.3 KiB
TypeScript
export const STATIC_STICKER_CATALOG_SCHEMA_VERSION = "StaticStickerCatalog/v1" as const;
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export const STATIC_STICKER_CATALOG_ORIGIN = "bundled_read_only" as const;
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export interface StaticStickerThumbnailReference {
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media: "thumbnail";
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resource_id: string;
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resource_version: string;
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url: string;
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}
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export interface StaticStickerCatalogItem {
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stable_id: string;
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part: number;
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order: number;
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original_filename: string;
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relative_path: string;
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width: number;
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height: number;
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mime_type: "image/png" | "image/webp";
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mime: "image/png" | "image/webp";
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sha256: string;
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original_reference: string;
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thumbnail_reference: StaticStickerThumbnailReference;
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resource_version: string;
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enabled: boolean;
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origin: "bundled_read_only" | "admin_uploaded";
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}
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export interface StaticStickerCatalog {
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schema_version: typeof STATIC_STICKER_CATALOG_SCHEMA_VERSION;
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release_version: string;
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manifest_sha256: string;
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count: number;
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part_counts: Record<string, number>;
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duplicate_sha256_groups: Array<{ sha256: string; stable_ids: string[] }>;
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items: StaticStickerCatalogItem[];
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}
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export interface VirtualStickerWindowOptions {
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itemHeight: number;
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viewportHeight: number;
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columns: number;
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overscanScreens: number;
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scrollTop: number;
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}
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export interface VirtualStickerWindow<T extends { stable_id: string }> {
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start: number;
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end: number;
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top_spacer_px: number;
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bottom_spacer_px: number;
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items: T[];
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}
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export function stableStickerId(index: number): string {
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if (!Number.isInteger(index) || index < 1) throw new Error("sticker_index_invalid");
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return `STK${String(index).padStart(index < 1_000 ? 3 : 4, "0")}`;
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}
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export function getVirtualStickerWindow<T extends { stable_id: string }>(items: readonly T[], options: VirtualStickerWindowOptions): VirtualStickerWindow<T> {
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const itemHeight = Math.max(1, options.itemHeight);
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const viewportHeight = Math.max(1, options.viewportHeight);
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const columns = Math.max(1, Math.floor(options.columns));
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const overscanScreens = Math.max(0, options.overscanScreens);
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const scrollTop = Math.max(0, options.scrollTop);
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const totalRows = Math.ceil(items.length / columns);
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const visibleRows = Math.max(1, Math.ceil(viewportHeight / itemHeight));
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const overscanRows = Math.ceil((visibleRows * overscanScreens) / 2);
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const firstVisibleRow = Math.min(totalRows, Math.floor(scrollTop / itemHeight));
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const startRow = Math.max(0, firstVisibleRow - overscanRows);
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const endRow = Math.min(totalRows, firstVisibleRow + visibleRows + overscanRows);
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const start = startRow * columns;
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const end = Math.min(items.length, endRow * columns);
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return {
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bottom_spacer_px: Math.max(0, (totalRows - endRow) * itemHeight),
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end,
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items: items.slice(start, end) as T[],
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start,
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top_spacer_px: startRow * itemHeight,
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};
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}
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export function staticStickerThumbnailUrl(item: Pick<StaticStickerCatalogItem, "resource_version" | "stable_id">): string {
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return `/api/v1/assets/public/${encodeURIComponent(item.resource_version)}/${encodeURIComponent(item.stable_id)}?variant=thumbnail`;
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}
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export function staticStickerOriginalUrl(item: Pick<StaticStickerCatalogItem, "resource_version" | "stable_id">): string {
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return `/api/v1/assets/public/${encodeURIComponent(item.resource_version)}/${encodeURIComponent(item.stable_id)}`;
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}
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