reduce ResizeObserver number

package.json

@@ -52,6 +52,7 @@
     "@solid-primitives/map": "^0.4.13",
     "@solid-primitives/page-visibility": "^2.0.17",
     "@solid-primitives/resize-observer": "^2.0.26",
+    "@solid-primitives/static-store": "^0.1.0",
     "@solidjs/router": "^0.15.2",
     "@suid/icons-material": "^0.8.1",
     "@suid/material": "^0.18.0",

src/App.tsx

@@ -33,6 +33,7 @@ import { Service } from "./serviceworker/services.js";
 import { makeEventListener } from "@solid-primitives/event-listener";
 import { ServiceWorkerProvider } from "./platform/host.js";
 import StackedRouter from "./platform/StackedRouter.js";
+import {ResizeObserverBoundary} from "~platform/resize-observer.jsx";
 
 const AccountSignIn = lazy(() => import("./accounts/SignIn.js"));
 const AccountMastodonOAuth2Callback = lazy(
@@ -157,6 +158,7 @@ const App: Component = () => {
       }}
     >
       <ThemeProvider theme={theme}>
+        <ResizeObserverBoundary>
         <AppLocaleProvider
           value={{
             language: lang,
@@ -176,6 +178,7 @@ const App: Component = () => {
             </ServiceWorkerProvider>
           </ClientProvider>
         </AppLocaleProvider>
+        </ResizeObserverBoundary>
       </ThemeProvider>
     </ErrorBoundary>
   );

src/material/Scaffold.tsx

@@ -1,4 +1,4 @@
-import { createElementSize } from "@solid-primitives/resize-observer";
+import { createElementSize } from "~platform/resize-observer";
 import {
   JSX,
   Show,

src/platform/Masonry.tsx

@@ -10,7 +10,7 @@ import {
 } from "solid-js";
 import { Dynamic, type DynamicProps } from "solid-js/web";
 import MasonryLayout from "masonry-layout";
-import { createElementSize } from "@solid-primitives/resize-observer";
+import { createElementSize } from "~platform/resize-observer";
 import "./Masonry.css";
 
 type MasonryContainer =

src/platform/resize-observer.tsx

@@ -0,0 +1,158 @@
+import {
+  createContext,
+  createEffect,
+  onCleanup,
+  sharedConfig,
+  useContext,
+  type JSX,
+} from "solid-js";
+import { isDev, isServer } from "solid-js/web";
+import { createStaticStore } from "@solid-primitives/static-store";
+
+export type ObserveCallback<E extends Element> = (
+  entry: ResizeObserverEntry & { readonly target: E },
+) => void;
+export type ObserveElement = <E extends Element = Element>(
+  element: E,
+  callback: ObserveCallback<E>,
+) => () => void;
+
+const ResizeObserverContext = /* @__PURE__ */ createContext<ObserveElement>();
+
+export function useResizeObserver() {
+  const observe = useContext(ResizeObserverContext);
+
+  if (isDev && !observe) {
+    throw new TypeError(
+      "ObserverElement is not found, this function must be called in <ResizeOberserBoundary />",
+    );
+  }
+
+  return observe!;
+}
+
+function ResizeObserverBoundaryClient(props: { children: JSX.Element }) {
+  const map = new Map<
+    Element,
+    ObserveCallback<Element> | ObserveCallback<Element>[]
+  >();
+
+  const observer = new ResizeObserver((entries) => {
+    for (const entry of entries) {
+      const callback = map.get(entry.target);
+      if (!callback) return;
+      if (Array.isArray(callback)) {
+        for (const f of callback) {
+          f(entry);
+        }
+      } else {
+        callback(entry);
+      }
+    }
+  });
+
+  onCleanup(() => {
+    observer.disconnect();
+  });
+
+  const observe: ObserveElement = (
+    element: Element,
+    callback: ObserveCallback<any>,
+  ) => {
+    const callbacks = map.get(element);
+    if (!callbacks) {
+      map.set(element, callback);
+      observer.observe(element);
+    } else if (Array.isArray(callbacks)) {
+      callbacks.push(callback);
+    } else {
+      map.set(element, [callbacks, callback]);
+    }
+
+    return () => {
+      const callbacks = map.get(element);
+      if (callbacks === null) {
+        observer.unobserve(element);
+      } else if (Array.isArray(callbacks)) {
+        const idx = callbacks.indexOf(callback);
+        if (idx !== -1) {
+          callbacks.splice(idx, 1);
+        }
+
+        if (callbacks.length === 0) {
+          observer.unobserve(element);
+          map.delete(element);
+        }
+      } else {
+        observer.unobserve(element);
+        map.delete(element);
+      }
+    };
+  };
+
+  return (
+    <ResizeObserverContext.Provider value={observe}>
+      {props.children}
+    </ResizeObserverContext.Provider>
+  );
+}
+
+function ResizeObserverBoundaryServer(props: { children: JSX.Element }) {
+  return (
+    <ResizeObserverContext.Provider
+      value={(() => {}) as unknown as ObserveElement}
+    >
+      {props.children}
+    </ResizeObserverContext.Provider>
+  );
+}
+
+export const ResizeObserverBoundary = isServer
+  ? ResizeObserverBoundaryServer
+  : ResizeObserverBoundaryClient;
+
+const ELEMENT_SIZE_FALLBACK = { width: null, height: null };
+
+function getElementSize(target: Element) {
+  if (isServer || !target) {
+    return { ...ELEMENT_SIZE_FALLBACK };
+  }
+  const { width, height } = target.getBoundingClientRect();
+  return { width, height };
+}
+
+export type NullableSize = {width: number | null, height: number | null}
+
+export function createElementSize(
+  target: Element | (() => Element | undefined | null | false),
+): Readonly<NullableSize> {
+  if (isServer) {
+    return ELEMENT_SIZE_FALLBACK;
+  }
+  const isFn = typeof target === "function";
+  const [size, setSize] = createStaticStore(
+    sharedConfig.context || isFn
+      ? ELEMENT_SIZE_FALLBACK
+      : getElementSize(target),
+  );
+  const callback: ObserveCallback<Element> = (entry) => {
+    setSize(getElementSize(entry.target));
+  };
+  const observe = useResizeObserver();
+  if (isFn) {
+    createEffect(() => {
+      const el = target();
+      if (el) {
+        setSize(getElementSize(el));
+        const unobserve = observe(el, callback);
+        onCleanup(unobserve);
+      }
+    });
+  } else {
+    const unobserve = observe(target, callback);
+    onCleanup(unobserve);
+  }
+  return size;
+}
+
+export { useWindowSize } from "@solid-primitives/resize-observer";

src/timelines/toots/MediaAttachmentGrid.tsx

@@ -12,10 +12,7 @@ import {
 } from "solid-js";
 import MediaViewer from "../MediaViewer";
 import { render } from "solid-js/web";
-import {
-  createElementSize,
-  useWindowSize,
-} from "@solid-primitives/resize-observer";
+import { createElementSize, useWindowSize } from "~platform/resize-observer";
 import { useStore } from "@nanostores/solid";
 import { $settings } from "../../settings/stores";
 import { averageColorHex } from "~platform/blurhash";