471d29bec9
CSS grid + aspect-ratio 下 fr 行在部分浏览器不撑满,留出 bg-black。
改为 Telegram 同款:算法输出每块 {left,top,width,height} 百分比坐标,
图块绝对定位铺满容器。顺带修复竖主图在左时右侧堆叠图高度算错未填满列。
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
60 lines
2.8 KiB
TypeScript
60 lines
2.8 KiB
TypeScript
import { describe, expect, it } from "vitest";
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import { computeAlbumLayout, type AlbumTile } from "./albumLayout";
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/** Right/bottom edge of a tile, as fractions of the box. */
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const right = (t: AlbumTile) => t.left + t.width;
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const bottom = (t: AlbumTile) => t.top + t.height;
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describe("computeAlbumLayout", () => {
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it("returns null for fewer than 2 images", () => {
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expect(computeAlbumLayout([])).toBeNull();
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expect(computeAlbumLayout([1.5])).toBeNull();
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});
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it("places two portraits side by side, splitting the full width", () => {
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const layout = computeAlbumLayout([0.7, 0.8])!;
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expect(layout.aspectRatio).toBeCloseTo(0.7 + 0.8, 4);
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expect(layout.tiles).toHaveLength(2);
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// Full height each, adjacent columns covering the whole width.
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expect(layout.tiles[0]).toMatchObject({ left: 0, top: 0, height: 1 });
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expect(layout.tiles[1].top).toBe(0);
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expect(layout.tiles[1].height).toBe(1);
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expect(right(layout.tiles[0])).toBeCloseTo(layout.tiles[1].left, 6);
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expect(right(layout.tiles[1])).toBeCloseTo(1, 6);
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});
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it("stacks two landscapes vertically, splitting the full height", () => {
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const layout = computeAlbumLayout([1.6, 1.4])!;
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expect(layout.aspectRatio).toBeCloseTo(1 / (1 / 1.6 + 1 / 1.4), 4);
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expect(layout.tiles[0]).toMatchObject({ left: 0, top: 0, width: 1 });
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expect(layout.tiles[1].left).toBe(0);
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expect(layout.tiles[1].width).toBe(1);
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expect(bottom(layout.tiles[0])).toBeCloseTo(layout.tiles[1].top, 6);
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expect(bottom(layout.tiles[1])).toBeCloseTo(1, 6);
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});
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it("portrait primary on the left, rest stacked on the right, fully covering", () => {
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const layout = computeAlbumLayout([0.6, 1.2, 1.3])!;
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// Primary occupies the full-height left column.
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expect(layout.tiles[0]).toMatchObject({ left: 0, top: 0, height: 1 });
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// Secondary tiles share the right column and fill it top-to-bottom.
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expect(layout.tiles[1].left).toBeCloseTo(layout.tiles[0].width, 6);
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expect(layout.tiles[1].top).toBe(0);
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expect(bottom(layout.tiles[1])).toBeCloseTo(layout.tiles[2].top, 6);
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expect(bottom(layout.tiles[2])).toBeCloseTo(1, 6);
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expect(right(layout.tiles[2])).toBeCloseTo(1, 6);
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});
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it("landscape primary on top, rest in a bottom row, fully covering", () => {
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const layout = computeAlbumLayout([1.8, 0.9, 1.1])!;
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// Primary occupies the full-width top row.
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expect(layout.tiles[0]).toMatchObject({ left: 0, top: 0, width: 1 });
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// Secondary tiles share the bottom row and fill it left-to-right.
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expect(layout.tiles[1].top).toBeCloseTo(layout.tiles[0].height, 6);
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expect(layout.tiles[1].left).toBe(0);
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expect(right(layout.tiles[1])).toBeCloseTo(layout.tiles[2].left, 6);
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expect(right(layout.tiles[2])).toBeCloseTo(1, 6);
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expect(bottom(layout.tiles[2])).toBeCloseTo(1, 6);
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});
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});
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