Convert some class components to functions.

src/components/AccessTokenSender.js

@@ -1,48 +1,31 @@
-import { Component } from 'react';
+import { useCallback } from 'react';
 import PropTypes from 'prop-types';
 import { IIIFIFrameCommunication } from './IIIFIFrameCommunication';
 
 /**
  * Opens a new window for click
  */
-export class AccessTokenSender extends Component {
-  /** */
-  constructor(props) {
-    super(props);
-
-    this.onReceiveAccessTokenMessage = this.onReceiveAccessTokenMessage.bind(this);
-  }
-
-  /** @private */
-  onReceiveAccessTokenMessage(e) {
-    const { handleAccessTokenMessage, url } = this.props;
+export function AccessTokenSender({ handleAccessTokenMessage, url = undefined }) {
+  const onReceiveAccessTokenMessage = useCallback((e) => {
     if (e.data && e.data.messageId && e.data.messageId === url) handleAccessTokenMessage(e.data);
-  }
+  }, [handleAccessTokenMessage, url]);
 
-  /** */
-  render() {
-    const { url } = this.props;
-    if (!url) return null;
+  if (!url) return null;
 
-    /**
-    login, clickthrough/kiosk open @id, wait for close
-    external, no-op
-    */
-    return (
-      <IIIFIFrameCommunication
-        src={`${url}?origin=${window.origin}&messageId=${url}`}
-        title="AccessTokenSender"
-        handleReceiveMessage={this.onReceiveAccessTokenMessage}
-      />
-    );
-  }
+  /**
+  login, clickthrough/kiosk open @id, wait for close
+  external, no-op
+  */
+  return (
+    <IIIFIFrameCommunication
+      src={`${url}?origin=${window.origin}&messageId=${url}`}
+      title="AccessTokenSender"
+      handleReceiveMessage={onReceiveAccessTokenMessage}
+    />
+  );
 }
 
 AccessTokenSender.propTypes = {
   handleAccessTokenMessage: PropTypes.func.isRequired,
   url: PropTypes.string,
 };
-
-AccessTokenSender.defaultProps = {
-  url: undefined,
-};

src/components/AnnotationSettings.js

@@ -1,4 +1,3 @@
-import { Component } from 'react';
 import PropTypes from 'prop-types';
 import VisibilityIcon from '@mui/icons-material/VisibilitySharp';
 import VisibilityOffIcon from '@mui/icons-material/VisibilityOffSharp';
@@ -8,26 +7,19 @@ import MiradorMenuButton from '../containers/MiradorMenuButton';
  * AnnotationSettings is a component to handle various annotation
  * display settings in the Annotation companion window
 */
-export class AnnotationSettings extends Component {
-  /**
-   * Returns the rendered component
-  */
-  render() {
-    const {
-      displayAll, displayAllDisabled, t, toggleAnnotationDisplay,
-    } = this.props;
-
-    return (
-      <MiradorMenuButton
-        aria-label={t(displayAll ? 'displayNoAnnotations' : 'highlightAllAnnotations')}
-        onClick={toggleAnnotationDisplay}
-        disabled={displayAllDisabled}
-        size="small"
-      >
-        { displayAll ? <VisibilityIcon /> : <VisibilityOffIcon /> }
-      </MiradorMenuButton>
-    );
-  }
+export function AnnotationSettings({
+  displayAll, displayAllDisabled, t, toggleAnnotationDisplay,
+}) {
+  return (
+    <MiradorMenuButton
+      aria-label={t(displayAll ? 'displayNoAnnotations' : 'highlightAllAnnotations')}
+      onClick={toggleAnnotationDisplay}
+      disabled={displayAllDisabled}
+      size="small"
+    >
+      { displayAll ? <VisibilityIcon /> : <VisibilityOffIcon /> }
+    </MiradorMenuButton>
+  );
 }
 
 AnnotationSettings.propTypes = {

src/components/App.js

@@ -1,5 +1,5 @@
 import {
-  createRef, Component, lazy, Suspense,
+  createRef, lazy, Suspense,
 } from 'react';
 import PropTypes from 'prop-types';
 import PluginProvider from '../extend/PluginProvider';
@@ -12,45 +12,27 @@ const WorkspaceArea = lazy(() => import('../containers/WorkspaceArea'));
  * This is the top level Mirador component.
  * @prop {Object} manifests
  */
-export class App extends Component {
-  /** */
-  constructor(props) {
-    super(props);
-
-    this.areaRef = createRef();
-  }
-
-  /**
-   * render
-   * @return {String} - HTML markup for the component
-   */
-  render() {
-    const { dndManager, plugins } = this.props;
-
-    return (
-      <PluginProvider plugins={plugins}>
-        <AppProviders dndManager={dndManager}>
-          <WorkspaceContext.Provider value={this.areaRef}>
-            <Suspense
-              fallback={<div />}
-            >
-              <WorkspaceArea areaRef={this.areaRef} />
-            </Suspense>
-          </WorkspaceContext.Provider>
-        </AppProviders>
-      </PluginProvider>
-    );
-  }
+export function App({ dndManager = undefined, plugins = [] }) {
+  const areaRef = createRef();
+
+  return (
+    <PluginProvider plugins={plugins}>
+      <AppProviders dndManager={dndManager}>
+        <WorkspaceContext.Provider value={areaRef}>
+          <Suspense
+            fallback={<div />}
+          >
+            <WorkspaceArea areaRef={areaRef} />
+          </Suspense>
+        </WorkspaceContext.Provider>
+      </AppProviders>
+    </PluginProvider>
+  );
 }
 
 App.propTypes = {
   dndManager: PropTypes.object, // eslint-disable-line react/forbid-prop-types
   plugins: PropTypes.array, // eslint-disable-line react/forbid-prop-types
 };
 
-App.defaultProps = {
-  dndManager: undefined,
-  plugins: [],
-};
-
 export default App;

src/components/AppProviders.js

@@ -1,4 +1,4 @@
-import { Component } from 'react';
+import { useState, useEffect } from 'react';
 import PropTypes from 'prop-types';
 import { FullScreen, useFullScreenHandle } from 'react-full-screen';
 import { I18nextProvider } from 'react-i18next';
@@ -68,72 +68,70 @@ FullScreenShim.propTypes = {
 };
 
 /**
- * This component adds viewer-specific providers.
- * @prop {Object} manifests
+ * Hook up the I18next provider to the configuration in redux to allow
+ * plugins + config to inject additional translations.
  */
-export class AppProviders extends Component {
-  /** */
-  constructor(props) {
-    super(props);
-
-    this.i18n = createI18nInstance();
-    // Set i18n language
-    this.i18n.changeLanguage(props.language);
-  }
+const StoreAwareI18nextProvider = ({ children, language, translations }) => {
+  const [i18n] = useState(createI18nInstance());
+  useEffect(() => {
+    i18n.changeLanguage(language);
+  }, [i18n, language]);
 
-  /**
-   * Update the i18n language if it is changed
-   */
-  componentDidUpdate(prevProps) {
-    const { language } = this.props;
-    if (prevProps.language !== language) {
-      this.i18n.changeLanguage(language);
-    }
-  }
+  useEffect(() => {
+    Object.keys(translations).forEach((lng) => {
+      i18n.addResourceBundle(lng, 'translation', translations[lng], true, true);
+    });
+  }, [i18n, translations]);
 
-  /** */
-  render() {
-    const {
-      children,
-      theme, translations,
-      dndManager,
-    } = this.props;
+  return (<I18nextProvider i18n={i18n}>{children}</I18nextProvider>);
+};
 
-    /**
-     * Create rtl emotion cache
-     */
-    const cacheRtl = createCache({
-      key: 'muirtl',
-      stylisPlugins: [prefixer, rtlPlugin],
-    });
+StoreAwareI18nextProvider.propTypes = {
+  children: PropTypes.node.isRequired,
+  language: PropTypes.string.isRequired,
+  translations: PropTypes.object.isRequired, // eslint-disable-line react/forbid-prop-types
+};
 
-    /**
-     * Create default emotion cache
-     */
-    const cacheDefault = createCache({
-      key: 'mui',
-    });
+/**
+ * Create rtl emotion cache
+ */
+const cacheRtl = createCache({
+  key: 'muirtl',
+  stylisPlugins: [prefixer, rtlPlugin],
+});
 
-    Object.keys(translations).forEach((lng) => {
-      this.i18n.addResourceBundle(lng, 'translation', translations[lng], true, true);
-    });
+/**
+ * Create default emotion cache
+ */
+const cacheDefault = createCache({
+  key: 'mui',
+});
 
-    return (
-      <FullScreenShim>
-        <I18nextProvider i18n={this.i18n}>
-          <StyledEngineProvider injectFirst>
-            <CacheProvider value={theme.direction === 'rtl' ? cacheRtl : cacheDefault}>
-              <ThemeProvider theme={createTheme((theme))}>
-                <MaybeDndProvider dndManager={dndManager}>
-                  {children}
-                </MaybeDndProvider>
-              </ThemeProvider>
-            </CacheProvider>
-          </StyledEngineProvider>
-        </I18nextProvider>
-      </FullScreenShim>
-    );
-  }
+/**
+ * This component adds viewer-specific providers.
+ * @prop {Object} manifests
+ */
+export function AppProviders({
+  children = null,
+  language,
+  theme, translations,
+  dndManager = undefined,
+}) {
+  return (
+    <FullScreenShim>
+      <StoreAwareI18nextProvider language={language} translations={translations}>
+        <StyledEngineProvider injectFirst>
+          <CacheProvider value={theme.direction === 'rtl' ? cacheRtl : cacheDefault}>
+            <ThemeProvider theme={createTheme((theme))}>
+              <MaybeDndProvider dndManager={dndManager}>
+                {children}
+              </MaybeDndProvider>
+            </ThemeProvider>
+          </CacheProvider>
+        </StyledEngineProvider>
+      </StoreAwareI18nextProvider>
+    </FullScreenShim>
+  );
 }
 
 AppProviders.propTypes = {
@@ -143,8 +141,3 @@ AppProviders.propTypes = {
   theme: PropTypes.object.isRequired, // eslint-disable-line react/forbid-prop-types
   translations: PropTypes.object.isRequired, // eslint-disable-line react/forbid-prop-types
 };
-
-AppProviders.defaultProps = {
-  children: null,
-  dndManager: undefined,
-};