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static/js/render-queue.js

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+/*
+ * Copyright (C) 2026 Mateusz Gruszczynski @linuxiarz.pl
+ * Source-Available Code / Dual-Licensed.
+ *
+ * Free for non-commercial and evaluation use under terms of BSL/GPLv3.
+ * Commercial or production use requires a valid paid license.
+ * See LICENSE file in repository root for details.
+ */
+
+export function createRenderQueue(renderNow, schedule = queueMicrotask) {
+  if (typeof renderNow !== "function") throw new TypeError("renderNow must be a function");
+  if (typeof schedule !== "function") throw new TypeError("schedule must be a function");
+
+  let rendering = false;
+  let pending = false;
+  let scheduled = false;
+
+  const schedulePendingRender = () => {
+    if (scheduled) return;
+    scheduled = true;
+    schedule(() => {
+      scheduled = false;
+      if (!pending) return;
+      pending = false;
+      render();
+    });
+  };
+
+  function render() {
+    if (rendering) {
+      pending = true;
+      schedulePendingRender();
+      return;
+    }
+
+    pending = false;
+    rendering = true;
+    try {
+      renderNow();
+    } finally {
+      rendering = false;
+      if (pending) schedulePendingRender();
+    }
+  }
+
+  return render;
+}