feat: md-bg

src/components/md-bg.tsx

@@ -0,0 +1,47 @@
+import { customElement, noShadowDOM } from "solid-element";
+import {createEffect, createResource } from "solid-js";
+import { resolvePath } from "./utils/path";
+
+customElement("md-bg", {}, (props, { element }) => {
+  noShadowDOM();
+
+  // 从 element 的 textContent 获取图片路径
+  const rawSrc = element?.textContent?.trim() || '';
+
+  // 隐藏原始文本内容
+  if (element) {
+    element.textContent = "";
+  }
+
+  // 从父节点 article 的 data-src 获取当前 markdown 文件完整路径
+  const articleEl = element?.closest('article');
+  const articlePath = articleEl?.getAttribute('data-src') || '';
+
+  // 解析相对路径
+  const resolvedSrc = resolvePath(articlePath, rawSrc);
+
+  // 加载图片
+  const loadImage = (src: string): Promise<HTMLImageElement> => {
+    return new Promise((resolve, reject) => {
+      const img = new Image();
+      img.onload = () => resolve(img);
+      img.onerror = reject;
+      img.src = src;
+    });
+  };
+
+  const [image] = createResource(resolvedSrc, loadImage);
+
+  createEffect(() => {
+    // 图片加载完成后，将背景图片设置到 article 元素
+      console.log(resolvedSrc, image(), articleEl);
+    if (image() && articleEl) {
+      articleEl.style.backgroundImage = `url(${resolvedSrc})`;
+      articleEl.style.backgroundSize = 'cover';
+      articleEl.style.backgroundPosition = 'center';
+      articleEl.style.backgroundRepeat = 'no-repeat';
+    }
+  });
+
+  return null;
+});