feat: 完善 Mermaid 配置与预览缩放

2026-07-26 23:10:22 +08:00
parent 15dd2acfc0
commit d93728bb8b
25 changed files with 870 additions and 56 deletions
@@ -0,0 +1,54 @@
+export const PREVIEW_ZOOM_STORAGE_KEY = "md-to-pdf.preview-zoom.v1";
+export const DEFAULT_PREVIEW_ZOOM = 100;
+export const MINIMUM_PREVIEW_ZOOM = 50;
+export const MAXIMUM_PREVIEW_ZOOM = 400;
+export const PREVIEW_ZOOM_SLIDER_STEP = 5;
+
+type PreviewZoomStorage = Pick<Storage, "getItem" | "setItem">;
+
+export function normalizePreviewZoom(value: number) {
+  if (!Number.isFinite(value)) {
+    return DEFAULT_PREVIEW_ZOOM;
+  }
+  return Math.min(
+    MAXIMUM_PREVIEW_ZOOM,
+    Math.max(MINIMUM_PREVIEW_ZOOM, Math.round(value))
+  );
+}
+
+export function parsePreviewZoom(
+  value: string | null,
+  fallback = DEFAULT_PREVIEW_ZOOM
+) {
+  if (!value?.trim()) {
+    return normalizePreviewZoom(fallback);
+  }
+  const parsed = Number(value);
+  return Number.isFinite(parsed)
+    ? normalizePreviewZoom(parsed)
+    : normalizePreviewZoom(fallback);
+}
+
+export function loadPreviewZoom(
+  storage: PreviewZoomStorage = window.localStorage
+) {
+  try {
+    return parsePreviewZoom(storage.getItem(PREVIEW_ZOOM_STORAGE_KEY));
+  } catch {
+    return DEFAULT_PREVIEW_ZOOM;
+  }
+}
+
+export function savePreviewZoom(
+  value: number,
+  storage: PreviewZoomStorage = window.localStorage
+) {
+  try {
+    storage.setItem(
+      PREVIEW_ZOOM_STORAGE_KEY,
+      String(normalizePreviewZoom(value))
+    );
+  } catch {
+    // 预览缩放是非关键偏好，浏览器禁用缓存时保持当前会话值即可。
+  }
+}