feat: 实现真实分页预览

2026-07-26 07:27:13 +08:00
parent 52cf816683
commit 1d93f31f85
15 changed files with 1614 additions and 269 deletions
@@ -0,0 +1,53 @@
+import { defaultExportConfig } from "@md-to-pdf/core";
+import { describe, expect, it } from "vitest";
+import {
+  calculateMermaidPageFit,
+  getPageContentDimensions,
+  parseSvgViewBox
+} from "../src/mermaid-page-fit";
+
+describe("Mermaid 单页高度适配", () => {
+  it("解析 SVG viewBox 尺寸", () => {
+    expect(parseSvgViewBox("0 0 1200 2400")).toEqual({
+      width: 1200,
+      height: 2400
+    });
+    expect(parseSvgViewBox("0,0,800,600")).toEqual({
+      width: 800,
+      height: 600
+    });
+    expect(parseSvgViewBox("0 0 0 600")).toBeUndefined();
+    expect(parseSvgViewBox(null)).toBeUndefined();
+  });
+
+  it("使用纸张和页边距计算正文区域", () => {
+    const dimensions = getPageContentDimensions(defaultExportConfig);
+
+    expect(dimensions.width).toBeCloseTo(672.7559, 3);
+    expect(dimensions.height).toBeCloseTo(1001.5748, 3);
+  });
+
+  it("宽度适配后未超高时保持普通 Mermaid 布局", () => {
+    const fit = calculateMermaidPageFit(
+      { width: 1600, height: 900 },
+      { width: 672, height: 1000 }
+    );
+
+    expect(fit).toEqual({
+      width: 672,
+      height: 378,
+      scaled: false
+    });
+  });
+
+  it("宽度适配后超高时按页面高度等比例缩小", () => {
+    const fit = calculateMermaidPageFit(
+      { width: 1000, height: 2000 },
+      { width: 672, height: 1000 }
+    );
+
+    expect(fit.scaled).toBe(true);
+    expect(fit.height).toBe(999);
+    expect(fit.width).toBe(499.5);
+  });
+});