#7670: Simplify injection of widgets onto the page (renderWidget)

src/components/AbortSignalGate.test.tsx

@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2024 PixieBrix, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+import React from "react";
+import { render, screen } from "@testing-library/react";
+import AbortSignalGate from "./AbortSignalGate";
+
+it("renders the children when active and hides them when aborted", () => {
+  const controller = new AbortController();
+  const { rerender } = render(
+    <AbortSignalGate signal={controller.signal}>
+      <div>Content</div>
+    </AbortSignalGate>,
+  );
+  expect(screen.getByText("Content")).toBeInTheDocument();
+
+  controller.abort();
+  rerender(
+    <AbortSignalGate signal={controller.signal}>
+      <div>Content</div>
+    </AbortSignalGate>,
+  );
+  expect(screen.queryByText("Content")).not.toBeInTheDocument();
+});
+
+it("does not render children when the signal is already aborted", () => {
+  render(
+    <AbortSignalGate signal={AbortSignal.abort()}>
+      <div>Content</div>
+    </AbortSignalGate>,
+  );
+  expect(screen.queryByText("Content")).not.toBeInTheDocument();
+});

src/components/AbortSignalGate.tsx

@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2024 PixieBrix, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+import useAbortSignal from "@/hooks/useAbortSignal";
+import React from "react";
+
+/**
+ * Render children until the signal is aborted
+ */
+const AbortSignalGate: React.FunctionComponent<{ signal: AbortSignal }> = ({
+  signal,
+  children,
+}) => {
+  const aborted = useAbortSignal(signal);
+  return aborted ? null : <>{children}</>;
+};
+
+export default AbortSignalGate;

src/components/InvalidatedContextGate.tsx

@@ -20,22 +20,28 @@ import { Button } from "react-bootstrap";
 import useContextInvalidated from "@/hooks/useContextInvalidated";
 import useDocumentVisibility from "@/hooks/useDocumentVisibility";
 
-const InvalidatedContextGate: React.FunctionComponent<{
-  contextNameTitleCase: string;
+type ContextInvalidatedProps = {
   autoReload?: boolean;
-}> = ({ children, contextNameTitleCase, autoReload }) => {
-  const wasContextInvalidated = useContextInvalidated();
+
+  /** The name to show on "Reload Context Name" button */
+  contextNameTitleCase: string;
+};
+
+const InformationPanel: React.FunctionComponent<ContextInvalidatedProps> = ({
+  autoReload,
+  contextNameTitleCase,
+}) => {
   // Only auto-reload if the document is in the background
   const isDocumentVisible = useDocumentVisibility();
-  if (wasContextInvalidated && autoReload && !isDocumentVisible) {
+  if (autoReload && !isDocumentVisible) {
     setTimeout(() => {
       // If you reload too soon, Chrome might not be ready to serve the page yet
       // TODO: Poll the page until it's ready instead of a timeout. Then auto-reload by default
       location.reload();
-    }, 500);
+    }, 1000);
   }
 
-  return wasContextInvalidated ? (
+  return (
     <div className="d-flex flex-column align-items-center justify-content-center">
       <p>
         PixieBrix was updated or restarted. Reload the{" "}
@@ -49,6 +55,21 @@ const InvalidatedContextGate: React.FunctionComponent<{
         Reload {contextNameTitleCase}
       </Button>
     </div>
+  );
+};
+
+/**
+ * A gate that shows an information panel with a reload button if the context was invalidated.
+ *
+ * Use `<AbortSignalGate signal={onContextInvalidated.signal}>` if you just want to unmount the children instead.
+ */
+const InvalidatedContextGate: React.FunctionComponent<
+  ContextInvalidatedProps
+> = ({ children, ...props }) => {
+  const wasContextInvalidated = useContextInvalidated();
+
+  return wasContextInvalidated ? (
+    <InformationPanel {...props} />
   ) : (
     <>{children}</>
   );

src/contentScript/modalDom.tsx

@@ -16,11 +16,10 @@
  */
 
 import React from "react";
-import { scrollbarWidth } from "@xobotyi/scrollbar-width";
-import { render, unmountComponentAtNode } from "react-dom";
-import { mergeSignals } from "abort-utils";
-import { onContextInvalidated } from "webext-events";
 import { expectContext } from "@/utils/expectContext";
+import { renderWidget } from "@/utils/reactUtils";
+import useScrollLock from "@/hooks/useScrollLock";
+import useAbortSignal from "@/hooks/useAbortSignal";
 
 // This cannot be moved to globals.d.ts because it's a module augmentation
 // https://stackoverflow.com/a/42085876/288906
@@ -29,41 +28,16 @@ declare module "react" {
     onClose?: ReactEventHandler<T> | undefined;
   }
 }
-/**
- * Show a modal with the given URL in the host page
- * @param url the URL to show
- * @param controller AbortController to cancel the modal
- * @param onOutsideClick callback to call when the user clicks outside the modal
- */
-export function showModal({
-  url,
-  controller,
-  onOutsideClick,
-}: {
+
+const IframeModal: React.VFC<{
   url: URL;
   controller: AbortController;
   onOutsideClick?: () => void;
-}): void {
-  // In React apps, should use React modal component
-  expectContext("contentScript");
-
-  // Using `<style>` will avoid overriding the site’s inline styles
-  const style = document.createElement("style");
+}> = ({ url, controller, onOutsideClick }) => {
+  const aborted = useAbortSignal(controller.signal);
+  useScrollLock(!aborted);
 
-  const scrollableRoot =
-    window.getComputedStyle(document.body).overflowY === "scroll"
-      ? "body"
-      : "html";
-  style.textContent += `${scrollableRoot} {overflow: hidden !important}`; // Disable scrollbar
-
-  // Preserve space initially taken by scrollbar
-  style.textContent += `html {padding-inline-end: ${scrollbarWidth()}px  !important}`;
-
-  const container = document.createElement("div");
-  const shadowRoot = container.attachShadow({ mode: "closed" });
-  document.body.append(container, style);
-  render(
-    // TODO: Wrap into separate component and use useScrollLock hook
+  return aborted ? null : (
     <dialog
       onClose={() => {
         controller.abort();
@@ -99,16 +73,27 @@ export function showModal({
           colorScheme: "normal", // Match parent color scheme #1650
         }}
       />
-    </dialog>,
-    shadowRoot,
+    </dialog>
   );
+};
 
-  mergeSignals(controller, onContextInvalidated.signal).addEventListener(
-    "abort",
-    () => {
-      unmountComponentAtNode(container);
-      style.remove();
-      container.remove();
-    },
-  );
+/**
+ * Show a modal with the given URL in the host page
+ * @param url the page to show in the modal
+ * @param controller AbortController to cancel the modal
+ * @param onOutsideClick callback to call when the user clicks outside the modal
+ */
+export function showModal(props: {
+  url: URL;
+  controller: AbortController;
+  onOutsideClick?: () => void;
+}): void {
+  // In React apps, you should use the React modal component
+  expectContext("contentScript");
+
+  renderWidget({
+    name: "iframe-modal",
+    widget: <IframeModal {...props} />,
+    signal: props.controller.signal,
+  });
 }

src/domConstants.ts

@@ -33,8 +33,6 @@ export const PIXIEBRIX_QUICK_BAR_CONTAINER_CLASS =
 export const PIXIEBRIX_TOOLTIPS_CONTAINER_CLASS =
   "pixiebrix-tooltips-container";
 
-export const PIXIEBRIX_NOTIFICATION_CLASS = "pixiebrix-notifier-container";
-
 export const EXTENSION_POINT_DATA_ATTR = "data-pb-extension-point";
 
 /**
@@ -47,7 +45,6 @@ export const PRIVATE_ATTRIBUTES_SELECTOR = `
   #${PANEL_FRAME_ID},
   .${PIXIEBRIX_TOOLTIPS_CONTAINER_CLASS},
   .${PIXIEBRIX_QUICK_BAR_CONTAINER_CLASS},
-  .${PIXIEBRIX_NOTIFICATION_CLASS},
   [${PIXIEBRIX_DATA_ATTR}],
   [${EXTENSION_POINT_DATA_ATTR}]
 `;

src/hooks/useAbortSignal.test.ts

@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2024 PixieBrix, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+import { renderHook } from "@testing-library/react-hooks";
+import useAbortSignal from "./useAbortSignal";
+
+it("returns the initial state of the signal", () => {
+  const active = renderHook(() => useAbortSignal(new AbortController().signal));
+  expect(active.result.current).toBe(false);
+
+  const aborted = renderHook(() => useAbortSignal(AbortSignal.abort()));
+  expect(aborted.result.current).toBe(true);
+});
+
+it("updates the state when the signal is aborted", () => {
+  const controller = new AbortController();
+  const { result } = renderHook(() => useAbortSignal(controller.signal));
+  expect(result.current).toBe(false);
+
+  controller.abort();
+  expect(result.current).toBe(true);
+});

src/hooks/useAbortSignal.ts

@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2024 PixieBrix, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+import { useSyncExternalStore } from "use-sync-external-store/shim";
+
+export default function useAbortSignal(signal: AbortSignal): boolean {
+  return useSyncExternalStore(
+    (callback: () => void) => {
+      const unsubscribe = new AbortController();
+      signal.addEventListener("abort", callback, {
+        signal: unsubscribe.signal,
+        once: true,
+      });
+      return () => {
+        unsubscribe.abort();
+      };
+    },
+    () => signal.aborted,
+  );
+}

src/hooks/useContextInvalidated.ts

@@ -15,15 +15,9 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-import { useSyncExternalStore } from "use-sync-external-store/shim";
-import { onContextInvalidated, wasContextInvalidated } from "webext-events";
-
-function subscribe(callback: () => void) {
-  const unsubscribe = new AbortController();
-  onContextInvalidated.addListener(callback, { signal: unsubscribe.signal });
-  return unsubscribe.abort.bind(unsubscribe);
-}
+import { onContextInvalidated } from "webext-events";
+import useAbortSignal from "./useAbortSignal";
 
 export default function useContextInvalidated(): boolean {
-  return useSyncExternalStore(subscribe, wasContextInvalidated);
+  return useAbortSignal(onContextInvalidated.signal);
 }

src/tsconfig.strictNullChecks.json

@@ -176,6 +176,8 @@
     "./bricks/transformers/traverseElements.ts",
     "./bricks/transformers/url.ts",
     "./bricks/types.ts",
+    "./components/AbortSignalGate.test.tsx",
+    "./components/AbortSignalGate.tsx",
     "./components/AceEditor.tsx",
     "./components/AceEditorSync.tsx",
     "./components/Alert.tsx",
@@ -450,6 +452,8 @@
     "./hooks/logging.ts",
     "./hooks/useAsyncExternalStore.ts",
     "./hooks/useAsyncState.ts",
+    "./hooks/useAbortSignal.test.ts",
+    "./hooks/useAbortSignal.ts",
     "./hooks/useAuthorizationGrantFlow.ts",
     "./hooks/useAutoFocusConfiguration.ts",
     "./hooks/useBrowserIdentifier.ts",
@@ -817,6 +821,7 @@
     "./utils/postMessage.ts",
     "./utils/preventNativeFormSubmission.ts",
     "./utils/promiseUtils.ts",
+    "./utils/reactUtils.tsx",
     "./utils/registryUtils.ts",
     "./utils/sanitize.ts",
     "./utils/schemaUtils.ts",