LogContext: Add button to scroll to center (#70821)

add scroll to center button

public/app/features/logs/components/log-context/LogContextButtons.test.tsx

@@ -7,7 +7,7 @@ import { LogContextButtons } from './LogContextButtons';
 describe('LogContextButtons', () => {
   it('should call onChangeWrapLines when the checkbox is used, case 1', async () => {
     const onChangeWrapLines = jest.fn();
-    render(<LogContextButtons onChangeWrapLines={onChangeWrapLines} />);
+    render(<LogContextButtons onChangeWrapLines={onChangeWrapLines} onScrollCenterClick={jest.fn()} />);
     const wrapLinesBox = screen.getByRole('checkbox', {
       name: 'Wrap lines',
     });
@@ -18,7 +18,7 @@ describe('LogContextButtons', () => {
 
   it('should call onChangeWrapLines when the checkbox is used, case 2', async () => {
     const onChangeWrapLines = jest.fn();
-    render(<LogContextButtons onChangeWrapLines={onChangeWrapLines} wrapLines />);
+    render(<LogContextButtons onChangeWrapLines={onChangeWrapLines} onScrollCenterClick={jest.fn()} wrapLines />);
     const wrapLinesBox = screen.getByRole('checkbox', {
       name: 'Wrap lines',
     });
@@ -26,4 +26,12 @@ describe('LogContextButtons', () => {
     expect(onChangeWrapLines).toHaveBeenCalledTimes(1);
     expect(onChangeWrapLines).toHaveBeenCalledWith(false);
   });
+
+  it('should call onScrollCenterClick when the button is clicked', async () => {
+    const onScrollCenterClick = jest.fn();
+    render(<LogContextButtons onChangeWrapLines={jest.fn()} onScrollCenterClick={onScrollCenterClick} />);
+    const scrollButton = screen.getByRole('button');
+    await userEvent.click(scrollButton);
+    expect(onScrollCenterClick).toHaveBeenCalledTimes(1);
+  });
 });

public/app/features/logs/components/log-context/LogContextButtons.tsx

@@ -1,15 +1,28 @@
+import { css } from '@emotion/css';
 import React, { useCallback } from 'react';
 
+import { GrafanaTheme2 } from '@grafana/data';
 import { reportInteraction } from '@grafana/runtime';
-import { InlineSwitch } from '@grafana/ui';
+import { Button, InlineSwitch, useStyles2 } from '@grafana/ui';
 
 export type Props = {
   wrapLines?: boolean;
   onChangeWrapLines: (wrapLines: boolean) => void;
+  onScrollCenterClick: () => void;
 };
 
+function getStyles(theme: GrafanaTheme2) {
+  return {
+    buttons: css({
+      display: 'flex',
+      gap: theme.spacing(1),
+    }),
+  };
+}
+
 export const LogContextButtons = (props: Props) => {
-  const { wrapLines, onChangeWrapLines } = props;
+  const styles = useStyles2(getStyles);
+  const { wrapLines, onChangeWrapLines, onScrollCenterClick } = props;
   const internalOnChangeWrapLines = useCallback(
     (event: React.FormEvent<HTMLInputElement>) => {
       const state = event.currentTarget.checked;
@@ -21,5 +34,12 @@ export const LogContextButtons = (props: Props) => {
     [onChangeWrapLines]
   );
 
-  return <InlineSwitch showLabel value={wrapLines} onChange={internalOnChangeWrapLines} label="Wrap lines" />;
+  return (
+    <div className={styles.buttons}>
+      <InlineSwitch showLabel value={wrapLines} onChange={internalOnChangeWrapLines} label="Wrap lines" />
+      <Button variant="secondary" onClick={onScrollCenterClick}>
+        Center matched line
+      </Button>
+    </div>
+  );
 };

public/app/features/logs/components/log-context/LogRowContextModal.tsx

@@ -362,6 +362,11 @@ export const LogRowContextModal: React.FunctionComponent<LogRowContextModalProps
     };
   }); // on every render, why not
 
+  const scrollToCenter = useCallback(() => {
+    preEntryElement.current?.scrollIntoView({ block: 'center' });
+    entryElement.current?.scrollIntoView({ block: 'center' });
+  }, [preEntryElement, entryElement]);
+
   useLayoutEffect(() => {
     const scrollE = scrollElement.current;
     if (scrollE == null) {
@@ -373,8 +378,7 @@ export const LogRowContextModal: React.FunctionComponent<LogRowContextModalProps
     prevClientHeightRef.current = currentClientHeight;
     if (prevClientHeight !== currentClientHeight) {
       // height has changed, we scroll to the center
-      preEntryElement.current?.scrollIntoView({ block: 'center' });
-      entryElement.current?.scrollIntoView({ block: 'center' });
+      scrollToCenter();
       return;
     }
 
@@ -385,7 +389,7 @@ export const LogRowContextModal: React.FunctionComponent<LogRowContextModalProps
       const newScrollTop = scrollE.scrollTop + (currentHeight - prevScrollHeight);
       scrollE.scrollTop = newScrollTop;
     }
-  }, [context.above.rows]);
+  }, [context.above.rows, scrollToCenter]);
 
   useAsync(updateContextQuery, [getRowContextQuery, row]);
 
@@ -405,7 +409,11 @@ export const LogRowContextModal: React.FunctionComponent<LogRowContextModalProps
       )}
       <div className={cx(styles.flexRow, styles.paddingBottom)}>
         <div>
-          <LogContextButtons wrapLines={wrapLines} onChangeWrapLines={setWrapLines} />
+          <LogContextButtons
+            wrapLines={wrapLines}
+            onChangeWrapLines={setWrapLines}
+            onScrollCenterClick={scrollToCenter}
+          />
         </div>
       </div>
       <div ref={scrollElement} className={styles.logRowGroups}>