fix: 修复长文档分页与滚动同步

2026-07-26 08:43:56 +08:00
parent 1d93f31f85
commit d62552384f
15 changed files with 449 additions and 61 deletions
@@ -0,0 +1,24 @@
+import { describe, expect, it } from "vitest";
+import { getNearestPageNumber } from "../src/preview-page";
+
+const pages = [
+  { top: 0, bottom: 100 },
+  { top: 124, bottom: 224 },
+  { top: 248, bottom: 348 }
+];
+
+describe("getNearestPageNumber", () => {
+  it("返回视口中心所在的页面", () => {
+    expect(getNearestPageNumber(180, pages)).toBe(2);
+  });
+
+  it("在页间空隙中返回距离最近的页面", () => {
+    expect(getNearestPageNumber(110, pages)).toBe(1);
+    expect(getNearestPageNumber(116, pages)).toBe(2);
+  });
+
+  it("没有页面或中心坐标无效时返回 0", () => {
+    expect(getNearestPageNumber(20, [])).toBe(0);
+    expect(getNearestPageNumber(Number.NaN, pages)).toBe(0);
+  });
+});