[Lens] Add loading indicator during debounce time (#80158)

docs/development/plugins/expressions/public/kibana-plugin-plugins-expressions-public.reactexpressionrenderer.md

@@ -7,5 +7,5 @@
 <b>Signature:</b>
 
 ```typescript
-ReactExpressionRenderer: ({ className, dataAttrs, padding, renderError, expression, onEvent, reload$, ...expressionLoaderOptions }: ReactExpressionRendererProps) => JSX.Element
+ReactExpressionRenderer: ({ className, dataAttrs, padding, renderError, expression, onEvent, reload$, debounce, ...expressionLoaderOptions }: ReactExpressionRendererProps) => JSX.Element
 ```

docs/development/plugins/expressions/public/kibana-plugin-plugins-expressions-public.reactexpressionrendererprops.debounce.md

@@ -0,0 +1,11 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-plugins-expressions-public](./kibana-plugin-plugins-expressions-public.md) &gt; [ReactExpressionRendererProps](./kibana-plugin-plugins-expressions-public.reactexpressionrendererprops.md) &gt; [debounce](./kibana-plugin-plugins-expressions-public.reactexpressionrendererprops.debounce.md)
+
+## ReactExpressionRendererProps.debounce property
+
+<b>Signature:</b>
+
+```typescript
+debounce?: number;
+```

docs/development/plugins/expressions/public/kibana-plugin-plugins-expressions-public.reactexpressionrendererprops.md

@@ -16,6 +16,7 @@ export interface ReactExpressionRendererProps extends IExpressionLoaderParams
 |  --- | --- | --- |
 |  [className](./kibana-plugin-plugins-expressions-public.reactexpressionrendererprops.classname.md) | <code>string</code> |  |
 |  [dataAttrs](./kibana-plugin-plugins-expressions-public.reactexpressionrendererprops.dataattrs.md) | <code>string[]</code> |  |
+|  [debounce](./kibana-plugin-plugins-expressions-public.reactexpressionrendererprops.debounce.md) | <code>number</code> |  |
 |  [expression](./kibana-plugin-plugins-expressions-public.reactexpressionrendererprops.expression.md) | <code>string &#124; ExpressionAstExpression</code> |  |
 |  [onEvent](./kibana-plugin-plugins-expressions-public.reactexpressionrendererprops.onevent.md) | <code>(event: ExpressionRendererEvent) =&gt; void</code> |  |
 |  [padding](./kibana-plugin-plugins-expressions-public.reactexpressionrendererprops.padding.md) | <code>'xs' &#124; 's' &#124; 'm' &#124; 'l' &#124; 'xl'</code> |  |

src/plugins/expressions/public/public.api.md

@@ -1039,7 +1039,7 @@ export interface Range {
 // Warning: (ae-missing-release-tag) "ReactExpressionRenderer" is exported by the package, but it is missing a release tag (@alpha, @beta, @public, or @internal)
 //
 // @public (undocumented)
-export const ReactExpressionRenderer: ({ className, dataAttrs, padding, renderError, expression, onEvent, reload$, ...expressionLoaderOptions }: ReactExpressionRendererProps) => JSX.Element;
+export const ReactExpressionRenderer: ({ className, dataAttrs, padding, renderError, expression, onEvent, reload$, debounce, ...expressionLoaderOptions }: ReactExpressionRendererProps) => JSX.Element;
 
 // Warning: (ae-missing-release-tag) "ReactExpressionRendererProps" is exported by the package, but it is missing a release tag (@alpha, @beta, @public, or @internal)
 //
@@ -1050,6 +1050,8 @@ export interface ReactExpressionRendererProps extends IExpressionLoaderParams {
     // (undocumented)
     dataAttrs?: string[];
     // (undocumented)
+    debounce?: number;
+    // (undocumented)
     expression: string | ExpressionAstExpression;
     // (undocumented)
     onEvent?: (event: ExpressionRendererEvent) => void;

src/plugins/expressions/public/react_expression_renderer.test.tsx

@@ -113,6 +113,39 @@ describe('ExpressionRenderer', () => {
     instance.unmount();
   });
 
+  it('waits for debounce period if specified', () => {
+    jest.useFakeTimers();
+
+    const refreshSubject = new Subject();
+    const loaderUpdate = jest.fn();
+
+    (ExpressionLoader as jest.Mock).mockImplementation(() => {
+      return {
+        render$: new Subject(),
+        data$: new Subject(),
+        loading$: new Subject(),
+        update: loaderUpdate,
+        destroy: jest.fn(),
+      };
+    });
+
+    const instance = mount(
+      <ReactExpressionRenderer reload$={refreshSubject} expression="" debounce={1000} />
+    );
+
+    instance.setProps({ expression: 'abc' });
+
+    expect(loaderUpdate).toHaveBeenCalledTimes(1);
+
+    act(() => {
+      jest.runAllTimers();
+    });
+
+    expect(loaderUpdate).toHaveBeenCalledTimes(2);
+
+    instance.unmount();
+  });
+
   it('should display a custom error message if the user provides one and then remove it after successful render', () => {
     const dataSubject = new Subject();
     const data$ = dataSubject.asObservable().pipe(share());

src/plugins/expressions/public/react_expression_renderer.tsx

@@ -45,6 +45,7 @@ export interface ReactExpressionRendererProps extends IExpressionLoaderParams {
    * An observable which can be used to re-run the expression without destroying the component
    */
   reload$?: Observable<unknown>;
+  debounce?: number;
 }
 
 export type ReactExpressionRendererType = React.ComponentType<ReactExpressionRendererProps>;
@@ -71,6 +72,7 @@ export const ReactExpressionRenderer = ({
   expression,
   onEvent,
   reload$,
+  debounce,
   ...expressionLoaderOptions
 }: ReactExpressionRendererProps) => {
   const mountpoint: React.MutableRefObject<null | HTMLDivElement> = useRef(null);
@@ -85,12 +87,28 @@ export const ReactExpressionRenderer = ({
   const errorRenderHandlerRef: React.MutableRefObject<null | IInterpreterRenderHandlers> = useRef(
     null
   );
+  const [debouncedExpression, setDebouncedExpression] = useState(expression);
+  useEffect(() => {
+    if (debounce === undefined) {
+      return;
+    }
+    const handler = setTimeout(() => {
+      setDebouncedExpression(expression);
+    }, debounce);
+
+    return () => {
+      clearTimeout(handler);
+    };
+  }, [expression, debounce]);
+
+  const activeExpression = debounce !== undefined ? debouncedExpression : expression;
+  const waitingForDebounceToComplete = debounce !== undefined && expression !== debouncedExpression;
 
   /* eslint-disable react-hooks/exhaustive-deps */
   // OK to ignore react-hooks/exhaustive-deps because options update is handled by calling .update()
   useEffect(() => {
     const subs: Subscription[] = [];
-    expressionLoaderRef.current = new ExpressionLoader(mountpoint.current!, expression, {
+    expressionLoaderRef.current = new ExpressionLoader(mountpoint.current!, activeExpression, {
       ...expressionLoaderOptions,
       // react component wrapper provides different
       // error handling api which is easier to work with from react
@@ -146,21 +164,21 @@ export const ReactExpressionRenderer = ({
   useEffect(() => {
     const subscription = reload$?.subscribe(() => {
       if (expressionLoaderRef.current) {
-        expressionLoaderRef.current.update(expression, expressionLoaderOptions);
+        expressionLoaderRef.current.update(activeExpression, expressionLoaderOptions);
       }
     });
     return () => subscription?.unsubscribe();
-  }, [reload$, expression, ...Object.values(expressionLoaderOptions)]);
+  }, [reload$, activeExpression, ...Object.values(expressionLoaderOptions)]);
 
   // Re-fetch data automatically when the inputs change
   useShallowCompareEffect(
     () => {
       if (expressionLoaderRef.current) {
-        expressionLoaderRef.current.update(expression, expressionLoaderOptions);
+        expressionLoaderRef.current.update(activeExpression, expressionLoaderOptions);
       }
     },
     // when expression is changed by reference and when any other loaderOption is changed by reference
-    [{ expression, ...expressionLoaderOptions }]
+    [{ activeExpression, ...expressionLoaderOptions }]
   );
 
   /* eslint-enable react-hooks/exhaustive-deps */
@@ -188,7 +206,9 @@ export const ReactExpressionRenderer = ({
   return (
     <div {...dataAttrs} className={classes}>
       {state.isEmpty && <EuiLoadingChart mono size="l" />}
-      {state.isLoading && <EuiProgress size="xs" color="accent" position="absolute" />}
+      {(state.isLoading || waitingForDebounceToComplete) && (
+        <EuiProgress size="xs" color="accent" position="absolute" />
+      )}
       {!state.isLoading &&
         state.error &&
         renderError &&

x-pack/plugins/lens/public/editor_frame_service/editor_frame/suggestion_panel.tsx

@@ -32,16 +32,11 @@ import {
   ReactExpressionRendererType,
 } from '../../../../../../src/plugins/expressions/public';
 import { prependDatasourceExpression } from './expression_helpers';
-import { debouncedComponent } from '../../debounced_component';
 import { trackUiEvent, trackSuggestionEvent } from '../../lens_ui_telemetry';
 import { DataPublicPluginStart } from '../../../../../../src/plugins/data/public';
 
 const MAX_SUGGESTIONS_DISPLAYED = 5;
 
-// TODO: Remove this <any> when upstream fix is merged https://github.com/elastic/eui/issues/2329
-// eslint-disable-next-line
-const EuiPanelFixed = EuiPanel as React.ComponentType<any>;
-
 export interface SuggestionPanelProps {
   activeDatasourceId: string | null;
   datasourceMap: Record<string, Datasource>;
@@ -82,6 +77,7 @@ const PreviewRenderer = ({
         className="lnsSuggestionPanel__expressionRenderer"
         padding="s"
         expression={expression}
+        debounce={2000}
         renderError={() => {
           return (
             <div className="lnsSuggestionPanel__suggestionIcon">
@@ -104,8 +100,6 @@ const PreviewRenderer = ({
   );
 };
 
-const DebouncedPreviewRenderer = debouncedComponent(PreviewRenderer, 2000);
-
 const SuggestionPreview = ({
   preview,
   ExpressionRenderer: ExpressionRendererComponent,
@@ -126,7 +120,7 @@ const SuggestionPreview = ({
   return (
     <EuiToolTip content={preview.title}>
       <div data-test-subj={`lnsSuggestion-${camelCase(preview.title)}`}>
-        <EuiPanelFixed
+        <EuiPanel
           className={classNames('lnsSuggestionPanel__button', {
             // eslint-disable-next-line @typescript-eslint/naming-convention
             'lnsSuggestionPanel__button-isSelected': selected,
@@ -136,7 +130,7 @@ const SuggestionPreview = ({
           onClick={onSelect}
         >
           {preview.expression ? (
-            <DebouncedPreviewRenderer
+            <PreviewRenderer
               ExpressionRendererComponent={ExpressionRendererComponent}
               expression={toExpression(preview.expression)}
               withLabel={Boolean(showTitleAsLabel)}
@@ -149,7 +143,7 @@ const SuggestionPreview = ({
           {showTitleAsLabel && (
             <span className="lnsSuggestionPanel__buttonLabel">{preview.title}</span>
           )}
-        </EuiPanelFixed>
+        </EuiPanel>
       </div>
     </EuiToolTip>
   );