[DevTools] Add React Element pane to browser Elements panel

packages/react-devtools-extensions/src/main/elementSelection.js

@@ -32,7 +32,7 @@ export function setReactSelectionFromBrowser(bridge) {
           return;
         }
 
-        // Remember to sync the selection next time we show Components tab.
+        // Remember to sync the selection next time we show inspected element
         bridge.send('syncSelectionFromBuiltinElementsPanel');
       }
     },

packages/react-devtools-extensions/src/main/index.js

@@ -206,6 +206,7 @@ function createBridgeAndStore() {
         bridge,
         browserTheme: getBrowserTheme(),
         componentsPortalContainer,
+        inspectedElementPortalContainer,
         profilerPortalContainer,
         editorPortalContainer,
         currentSelectedSource,
@@ -278,6 +279,51 @@ function createComponentsPanel() {
   );
 }
 
+function createElementsInspectPanel() {
+  if (inspectedElementPortalContainer) {
+    // Panel is created and user opened it at least once
+    ensureInitialHTMLIsCleared(inspectedElementPortalContainer);
+    render();
+
+    return;
+  }
+
+  if (inspectedElementPane) {
+    // Panel is created, but wasn't opened yet, so no document is present for it
+    return;
+  }
+
+  const elementsPanel = chrome.devtools.panels.elements;
+  if (__IS_FIREFOX__ || !elementsPanel || !elementsPanel.createSidebarPane) {
+    // Firefox will not pass the window to the onShown listener despite setPage
+    // being called.
+    // See https://bugzilla.mozilla.org/show_bug.cgi?id=2010549
+
+    // May not be supported in some browsers.
+    // See https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/devtools/panels/ElementsPanel/createSidebarPane#browser_compatibility
+    return;
+  }
+
+  elementsPanel.createSidebarPane('React Element ⚛', createdPane => {
+    inspectedElementPane = createdPane;
+
+    createdPane.setPage('panel.html');
+    createdPane.setHeight('75px');
+
+    createdPane.onShown.addListener(portal => {
+      inspectedElementPortalContainer = portal.container;
+      if (inspectedElementPortalContainer != null && render) {
+        ensureInitialHTMLIsCleared(inspectedElementPortalContainer);
+
+        render();
+        portal.injectStyles(cloneStyleTags);
+
+        logEvent({event_name: 'selected-inspected-element-pane'});
+      }
+    });
+  });
+}
+
 function createProfilerPanel() {
   if (profilerPortalContainer) {
     // Panel is created and user opened it at least once
@@ -508,6 +554,7 @@ function mountReactDevTools() {
   createComponentsPanel();
   createProfilerPanel();
   createSourcesEditorPanel();
+  createElementsInspectPanel();
   // Suspense Tab is created via the hook
   // TODO(enableSuspenseTab): Create eagerly once Suspense tab is stable
 }
@@ -556,10 +603,12 @@ let componentsPanel = null;
 let profilerPanel = null;
 let suspensePanel = null;
 let editorPane = null;
+let inspectedElementPane = null;
 let componentsPortalContainer = null;
 let profilerPortalContainer = null;
 let suspensePortalContainer = null;
 let editorPortalContainer = null;
+let inspectedElementPortalContainer = null;
 
 let mostRecentOverrideTab = null;
 let render = null;

packages/react-devtools-shared/src/devtools/views/Components/InspectedElement.css

@@ -77,3 +77,11 @@
   padding: 0.25rem;
   color: var(--color-console-error-icon);
 }
+
+.VRule {
+  height: 20px;
+  width: 1px;
+  flex: 0 0 1px;
+  margin: 0 0.5rem;
+  background-color: var(--color-border);
+}

packages/react-devtools-shared/src/devtools/views/Components/InspectedElement.js

@@ -34,13 +34,17 @@ import useEditorURL from '../useEditorURL';
 import styles from './InspectedElement.css';
 import Tooltip from './reach-ui/tooltip';
 
-export type Props = {};
+export type Props = {
+  actionButtons?: React.Node,
+};
 
 // TODO Make edits and deletes also use transition API!
 
 const noSourcePromise = Promise.resolve(null);
 
-export default function InspectedElementWrapper(_: Props): React.Node {
+export default function InspectedElementWrapper({
+  actionButtons,
+}: Props): React.Node {
   const {inspectedElementID} = useContext(TreeStateContext);
   const bridge = useContext(BridgeContext);
   const store = useContext(StoreContext);
@@ -305,6 +309,13 @@ export default function InspectedElementWrapper(_: Props): React.Node {
             symbolicatedSourcePromise={symbolicatedSourcePromise}
           />
         )}
+
+        {actionButtons && (
+          <>
+            <div className={styles.VRule} />
+            {actionButtons}
+          </>
+        )}
       </div>
 
       {inspectedElement === null && (

packages/react-devtools-shared/src/devtools/views/DevTools.js

@@ -26,6 +26,7 @@ import Profiler from './Profiler/Profiler';
 import SuspenseTab from './SuspenseTab/SuspenseTab';
 import TabBar from './TabBar';
 import EditorPane from './Editor/EditorPane';
+import InspectedElementPane from './InspectedElement/InspectedElementPane';
 import {SettingsContextController} from './Settings/SettingsContext';
 import {TreeContextController} from './Components/TreeContext';
 import ViewElementSourceContext from './Components/ViewElementSourceContext';
@@ -100,6 +101,7 @@ export type Props = {
   // The root <DevTools> app is rendered in the top-level extension window,
   // but individual tabs (e.g. Components, Profiling) can be rendered into portals within their browser panels.
   componentsPortalContainer?: Element,
+  inspectedElementPortalContainer?: Element,
   profilerPortalContainer?: Element,
   suspensePortalContainer?: Element,
   editorPortalContainer?: Element,
@@ -155,6 +157,7 @@ export default function DevTools({
   canViewElementSourceFunction,
   componentsPortalContainer,
   editorPortalContainer,
+  inspectedElementPortalContainer,
   profilerPortalContainer,
   suspensePortalContainer,
   currentSelectedSource,
@@ -379,6 +382,14 @@ export default function DevTools({
                                       portalContainer={editorPortalContainer}
                                     />
                                   ) : null}
+                                  {inspectedElementPortalContainer ? (
+                                    <InspectedElementPane
+                                      selectedSource={currentSelectedSource}
+                                      portalContainer={
+                                        inspectedElementPortalContainer
+                                      }
+                                    />
+                                  ) : null}
                                 </ThemeProvider>
                               </SuspenseTreeContextController>
                             </InspectedElementContextController>

packages/react-devtools-shared/src/devtools/views/InspectedElement/InspectedElementPane.css

@@ -0,0 +1,15 @@
+.InspectedElementPane, .InspectedElementPane * {
+  box-sizing: border-box;
+  -webkit-font-smoothing: var(--font-smoothing);
+}
+
+.InspectedElementPane {
+  position: relative;
+  width: 100%;
+  height: 100%;
+  display: flex;
+  flex-direction: row;
+  background-color: var(--color-background);
+  color: var(--color-text);
+  font-family: var(--font-family-sans);
+}

packages/react-devtools-shared/src/devtools/views/InspectedElement/InspectedElementPane.js

@@ -0,0 +1,34 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+
+import * as React from 'react';
+import {useContext} from 'react';
+
+import portaledContent from 'react-devtools-shared/src/devtools/views/portaledContent';
+import {OptionsContext} from 'react-devtools-shared/src/devtools/views/context';
+import InspectedElement from 'react-devtools-shared/src/devtools/views/Components/InspectedElement';
+import SettingsModal from 'react-devtools-shared/src/devtools/views/Settings/SettingsModal';
+import SettingsModalContextToggle from 'react-devtools-shared/src/devtools/views/Settings/SettingsModalContextToggle';
+import {SettingsModalContextController} from 'react-devtools-shared/src/devtools/views/Settings/SettingsModalContext';
+import styles from './InspectedElementPane.css';
+
+function InspectedElementPane() {
+  const {hideSettings} = useContext(OptionsContext);
+  return (
+    <SettingsModalContextController>
+      <div className={styles.InspectedElementPane}>
+        <InspectedElement
+          actionButtons={!hideSettings && <SettingsModalContextToggle />}
+        />
+        <SettingsModal />
+      </div>
+    </SettingsModalContextController>
+  );
+}
+export default (portaledContent(InspectedElementPane): component());