feat: Center previous portal when navigating back

editor.planx.uk/src/hooks/useScrollOnPreviousURLMatch.ts

@@ -0,0 +1,41 @@
+import { useTheme } from "@mui/material/styles";
+import { useStore } from "pages/FlowEditor/lib/store";
+import { useEffect, useRef } from "react";
+
+const useScrollOnPreviousURLMatch = <T extends HTMLElement>(
+  urlMatcher: string,
+) => {
+  const previousURL = useStore((state) => state.previousURL);
+  const ref = useRef<T | null>(null);
+  const theme = useTheme();
+
+  useEffect(() => {
+    if (!ref.current) return;
+
+    const isReturningFromPortal = previousURL?.endsWith(urlMatcher);
+    if (!isReturningFromPortal) return;
+
+    // Center node
+    ref.current.scrollIntoView({
+      block: "center",
+      inline: "center",
+    });
+
+    // Visually highlight node
+    const keyframes: Keyframe[] = [
+      { outline: `4px solid ${theme.palette.action.focus}`, outlineOffset: 0 },
+      { outline: `4px solid transparent`, outlineOffset: 0 },
+    ];
+
+    const animationOptions: KeyframeAnimationOptions = {
+      duration: 1500,
+      easing: "ease-in",
+    };
+
+    ref.current.animate(keyframes, animationOptions);
+  }, [previousURL, urlMatcher, theme]);
+
+  return ref;
+};
+
+export default useScrollOnPreviousURLMatch;

editor.planx.uk/src/pages/FlowEditor/components/Flow/components/Portal.tsx

@@ -4,6 +4,7 @@ import { ComponentType } from "@opensystemslab/planx-core/types";
 import { ICONS } from "@planx/components/shared/icons";
 import classNames from "classnames";
 import gql from "graphql-tag";
+import useScrollOnPreviousURLMatch from "hooks/useScrollOnPreviousURLMatch";
 import { useStore } from "pages/FlowEditor/lib/store";
 import React, { useState } from "react";
 import { useDrag } from "react-dnd";
@@ -17,6 +18,8 @@ import Question from "./Question";
 const ExternalPortal: React.FC<any> = (props) => {
   const [href, setHref] = useState("Loading...");
 
+  const ref = useScrollOnPreviousURLMatch<HTMLLIElement>(href);
+
   const addExternalPortal = useStore.getState().addExternalPortal;
 
   const { data, loading } = useQuery(
@@ -84,7 +87,7 @@ const ExternalPortal: React.FC<any> = (props) => {
   return (
     <>
       <Hanger hidden={isDragging} before={props.id} parent={parent} />
-      <li className={classNames("card", "portal", { isDragging })}>
+      <li className={classNames("card", "portal", { isDragging })} ref={ref}>
         <Link href={`/${href}`} prefetch={false} ref={drag}>
           <span>{href}</span>
         </Link>
@@ -128,10 +131,12 @@ const InternalPortal: React.FC<any> = (props) => {
 
   const Icon = ICONS[ComponentType.InternalPortal];
 
+  const ref = useScrollOnPreviousURLMatch<HTMLLIElement>(props.id);
+
   return (
     <>
       <Hanger hidden={isDragging} before={props.id} parent={parent} />
-      <li className={classNames("card", "portal", { isDragging })}>
+      <li className={classNames("card", "portal", { isDragging })} ref={ref}>
         <Link
           href={href}
           prefetch={false}

editor.planx.uk/src/pages/FlowEditor/lib/store/editor.ts

@@ -19,6 +19,7 @@ import {
 import { OT } from "@planx/graph/types";
 import axios from "axios";
 import { client } from "lib/graphql";
+import navigation from "lib/navigation";
 import debounce from "lodash/debounce";
 import isEmpty from "lodash/isEmpty";
 import omitBy from "lodash/omitBy";
@@ -55,6 +56,9 @@ export interface EditorUIStore {
   toggleShowImages: () => void;
   showDataFields: boolean;
   toggleShowDataFields: () => void;
+  previousURL?: string;
+  currentURL: string;
+  initURLTracking: () => void;
 }
 
 export const editorUIStore: StateCreator<
@@ -87,6 +91,22 @@ export const editorUIStore: StateCreator<
     showDataFields: false,
 
     toggleShowDataFields: () => set({ showDataFields: !get().showDataFields }),
+
+    previousURL: undefined,
+
+    currentURL: window.location.pathname,
+
+    initURLTracking: () => {
+      navigation.subscribe((route) => {
+        const { currentURL } = get();
+        if (route.url.pathname === currentURL) return;
+
+        set((state) => ({
+          previousURL: state.currentURL,
+          currentURL: route.url.pathname,
+        }));
+      });
+    },
   }),
   {
     name: "editorUIStore",
@@ -114,8 +134,8 @@ export interface FlowSummary {
     actor: {
       firstName: string;
       lastName: string;
-    }
-  }[]
+    };
+  }[];
 }
 
 export interface EditorStore extends Store.Store {
@@ -127,7 +147,7 @@ export interface EditorStore extends Store.Store {
   createFlow: (
     teamId: number,
     newSlug: string,
-    newName: string
+    newName: string,
   ) => Promise<string>;
   deleteFlow: (teamId: number, flowSlug: string) => Promise<object>;
   validateAndDiffFlow: (flowId: string) => Promise<any>;
@@ -142,12 +162,12 @@ export interface EditorStore extends Store.Store {
     id: NodeId,
     parent?: NodeId,
     toBefore?: NodeId,
-    toParent?: NodeId
+    toParent?: NodeId,
   ) => void;
   pasteNode: (toParent: NodeId, toBefore: NodeId) => void;
   publishFlow: (
     flowId: string,
-    summary?: string
+    summary?: string,
   ) => Promise<PublishFlowResponse>;
   removeNode: (id: NodeId, parent: NodeId) => void;
   updateNode: (node: any, relationships?: any) => void;
@@ -344,7 +364,9 @@ export const editorStore: StateCreator<
 
   getFlows: async (teamId) => {
     client.cache.reset();
-    const { data: { flows } } = await client.query<{ flows: FlowSummary[] }>({
+    const {
+      data: { flows },
+    } = await client.query<{ flows: FlowSummary[] }>({
       query: gql`
         query GetFlows($teamId: Int!) {
           flows(where: { team: { id: { _eq: $teamId } } }) {

editor.planx.uk/src/pages/layout/AuthenticatedLayout.tsx

@@ -3,6 +3,7 @@ import { containerClasses } from "@mui/material/Container";
 import { styled } from "@mui/material/styles";
 import EditorNavMenu from "components/EditorNavMenu";
 import RouteLoadingIndicator from "components/RouteLoadingIndicator";
+import { useStore } from "pages/FlowEditor/lib/store";
 import React, { PropsWithChildren } from "react";
 import { DndProvider } from "react-dnd";
 import { HTML5Backend } from "react-dnd-html5-backend";
@@ -33,17 +34,21 @@ const DashboardContainer = styled(Box)(({ theme }) => ({
   },
 }));
 
-const Layout: React.FC<PropsWithChildren> = ({ children }) => (
-  <>
-    <RouteLoadingIndicator />
-    <Header />
-    <DashboardWrap>
-      <EditorNavMenu />
-      <DashboardContainer>
-        <DndProvider backend={HTML5Backend}>{children}</DndProvider>
-      </DashboardContainer>
-    </DashboardWrap>
-  </>
-);
+const Layout: React.FC<PropsWithChildren> = ({ children }) => {
+  useStore((state) => state.initURLTracking());
+
+  return (
+    <>
+      <RouteLoadingIndicator />
+      <Header />
+      <DashboardWrap>
+        <EditorNavMenu />
+        <DashboardContainer>
+          <DndProvider backend={HTML5Backend}>{children}</DndProvider>
+        </DashboardContainer>
+      </DashboardWrap>
+    </>
+  );
+};
 
 export default Layout;