add missing event placeholders and recompute heights on load

awx/ui_next/src/screens/Job/JobOutput/JobEvent.jsx

@@ -98,11 +98,11 @@ function getTimestamp({ created }) {
   const dateMinutes = date.getMinutes();
   const dateSeconds = date.getSeconds();
 
-  const stampHour = dateHours < 10 ? `0${dateHours}` : dateHours;
-  const stampMinute = dateMinutes < 10 ? `0${dateMinutes}` : dateMinutes;
-  const stampSecond = dateSeconds < 10 ? `0${dateSeconds}` : dateSeconds;
+  const stampHours = dateHours < 10 ? `0${dateHours}` : dateHours;
+  const stampMinutes = dateMinutes < 10 ? `0${dateMinutes}` : dateMinutes;
+  const stampSeconds = dateSeconds < 10 ? `0${dateSeconds}` : dateSeconds;
 
-  return `${stampHour}:${stampMinute}:${stampSecond}`;
+  return `${stampHours}:${stampMinutes}:${stampSeconds}`;
 }
 
 function getLineTextHtml({ created, event, start_line, stdout }) {
@@ -127,13 +127,16 @@ function getLineTextHtml({ created, event, start_line, stdout }) {
   });
 }
 
-function JobEvent({ created, event, stdout, start_line, ...rest }) {
+function JobEvent({ counter, created, event, stdout, start_line, ...rest }) {
   return !stdout ? null : (
     <JobEventWrapper {...rest}>
       {getLineTextHtml({ created, event, start_line, stdout }).map(
         ({ lineNumber, html }) =>
-          lineNumber > 0 && (
-            <JobEventLine key={lineNumber} isFirst={lineNumber === 1}>
+          lineNumber !== 0 && (
+            <JobEventLine
+              key={`${counter}-${lineNumber}`}
+              isFirst={lineNumber === 1}
+            >
               <JobEventLineToggle />
               <JobEventLineNumber>{lineNumber}</JobEventLineNumber>
               <JobEventLineText

awx/ui_next/src/screens/Job/JobOutput/JobEventSkeleton.jsx

@@ -0,0 +1,85 @@
+import styled from 'styled-components';
+import React from 'react';
+
+const JobEventSkeletonWrapper = styled.div``;
+const JobEventSkeletonLine = styled.div`
+  display: flex;
+
+  &:hover {
+    background-color: white;
+  }
+
+  &:hover div {
+    background-color: white;
+  }
+
+  &--hidden {
+    display: none;
+  }
+`;
+const JobEventSkeletonLineToggle = styled.div`
+  background-color: #ebebeb;
+  color: #646972;
+  display: flex;
+  flex: 0 0 30px;
+  font-size: 18px;
+  justify-content: center;
+  line-height: 12px;
+
+  & > i {
+    cursor: pointer;
+  }
+
+  user-select: none;
+`;
+const JobEventSkeletonLineNumber = styled.div`
+  color: #161b1f;
+  background-color: #ebebeb;
+  flex: 0 0 45px;
+  text-align: right;
+  vertical-align: top;
+  padding-right: 5px;
+  border-right: 1px solid #b7b7b7;
+  user-select: none;
+`;
+const JobEventSkeletonContentWrapper = styled.div`
+  padding: 0 15px;
+  white-space: pre-wrap;
+  word-break: break-all;
+  word-wrap: break-word;
+
+  .content {
+    background: var(--pf-global--disabled-color--200);
+    background: linear-gradient(
+      to right,
+      #f5f5f5 10%,
+      #e8e8e8 18%,
+      #f5f5f5 33%
+    );
+    border-radius: 5px;
+  }
+`;
+
+function JobEventSkeletonContent({ contentLength }) {
+  return (
+    <JobEventSkeletonContentWrapper>
+      <span className="content">{' '.repeat(contentLength)}</span>
+    </JobEventSkeletonContentWrapper>
+  );
+}
+
+function JobEventSkeleton({ counter, contentLength, ...rest }) {
+  return (
+    counter > 1 && (
+      <JobEventSkeletonWrapper {...rest}>
+        <JobEventSkeletonLine key={counter}>
+          <JobEventSkeletonLineToggle />
+          <JobEventSkeletonLineNumber />
+          <JobEventSkeletonContent contentLength={contentLength} />
+        </JobEventSkeletonLine>
+      </JobEventSkeletonWrapper>
+    )
+  );
+}
+
+export default JobEventSkeleton;

awx/ui_next/src/screens/Job/JobOutput/JobEventSkeleton.test.jsx

@@ -0,0 +1,22 @@
+import React from 'react';
+import { mountWithContexts } from '@testUtils/enzymeHelpers';
+
+import JobEventSkeleton from './JobEventSkeleton';
+
+const contentSelector = 'JobEventSkeletonContent';
+
+describe('<JobEvenSkeletont />', () => {
+  test('initially renders successfully', () => {
+    const wrapper = mountWithContexts(
+      <JobEventSkeleton contentLength={80} counter={100} />
+    );
+    expect(wrapper.find(contentSelector).length).toEqual(1);
+  });
+
+  test('always skips first counter', () => {
+    const wrapper = mountWithContexts(
+      <JobEventSkeleton contentLength={80} counter={1} />
+    );
+    expect(wrapper.find(contentSelector).length).toEqual(0);
+  });
+});

awx/ui_next/src/screens/Job/JobOutput/JobOutput.jsx

@@ -14,6 +14,7 @@ import { JobsAPI } from '@api';
 import ContentError from '@components/ContentError';
 import ContentLoading from '@components/ContentLoading';
 import JobEvent from './JobEvent';
+import JobEventSkeleton from './JobEventSkeleton';
 import MenuControls from './shared/MenuControls';
 
 const OutputToolbar = styled.div`
@@ -37,9 +38,15 @@ const OutputFooter = styled.div`
   flex: 1;
 `;
 
-class JobOutput extends Component {
-  listRef = React.createRef();
+function range(low, high) {
+  const numbers = [];
+  for (let n = low; n <= high; n++) {
+    numbers.push(n);
+  }
+  return numbers;
+}
 
+class JobOutput extends Component {
   constructor(props) {
     super(props);
 
@@ -47,10 +54,7 @@ class JobOutput extends Component {
       contentError: null,
       hasContentLoading: true,
       results: {},
-      scrollToIndex: -1,
-      loadedRowCount: 0,
-      loadedRowsMap: {},
-      loadingRowCount: 0,
+      currentlyLoading: [],
       remoteRowCount: 0,
     };
 
@@ -74,10 +78,32 @@ class JobOutput extends Component {
     this.loadJobEvents();
   }
 
+  componentDidUpdate(prevProps, prevState) {
+    // recompute row heights for any job events that have transitioned
+    // from loading to loaded
+    const { currentlyLoading } = this.state;
+    let shouldRecomputeRowHeights = false;
+    prevState.currentlyLoading
+      .filter(n => !currentlyLoading.includes(n))
+      .forEach(n => {
+        shouldRecomputeRowHeights = true;
+        this.cache.clear(n);
+      });
+    if (shouldRecomputeRowHeights) {
+      this.listRef.recomputeRowHeights();
+    }
+  }
+
+  listRef = React.createRef();
+
   async loadJobEvents() {
     const { job } = this.props;
 
-    this.setState({ hasContentLoading: true });
+    const loadRange = range(1, 50);
+    this.setState(({ currentlyLoading }) => ({
+      hasContentLoading: true,
+      currentlyLoading: currentlyLoading.concat(loadRange),
+    }));
     try {
       const {
         data: { results: newResults = [], count },
@@ -85,7 +111,6 @@ class JobOutput extends Component {
         page_size: 50,
         order_by: 'start_line',
       });
-
       this.setState(({ results }) => {
         newResults.forEach(jobEvent => {
           results[jobEvent.counter] = jobEvent;
@@ -95,21 +120,23 @@ class JobOutput extends Component {
     } catch (err) {
       this.setState({ contentError: err });
     } finally {
-      this.setState({ hasContentLoading: false });
+      this.setState(({ currentlyLoading }) => ({
+        hasContentLoading: false,
+        currentlyLoading: currentlyLoading.filter(n => !loadRange.includes(n)),
+      }));
     }
   }
 
   isRowLoaded({ index }) {
-    const { results } = this.state;
-    return !!results[index];
+    const { results, currentlyLoading } = this.state;
+    if (results[index]) {
+      return true;
+    }
+    return currentlyLoading.includes(index);
   }
 
   rowRenderer({ index, parent, key, style }) {
     const { results } = this.state;
-    if (!results[index]) {
-      return;
-    }
-    const { created, event, stdout, start_line } = results[index];
     return (
       <CellMeasurer
         key={key}
@@ -118,33 +145,43 @@ class JobOutput extends Component {
         rowIndex={index}
         columnIndex={0}
       >
-        <JobEvent
-          className="row"
-          style={style}
-          created={created}
-          event={event}
-          start_line={start_line}
-          stdout={stdout}
-        />
+        {results[index] ? (
+          <JobEvent className="row" style={style} {...results[index]} />
+        ) : (
+          <JobEventSkeleton
+            className="row"
+            style={style}
+            counter={index}
+            contentLength={80}
+          />
+        )}
       </CellMeasurer>
     );
   }
 
-  async loadMoreRows({ startIndex, stopIndex }) {
+  loadMoreRows({ startIndex, stopIndex }) {
     const { job } = this.props;
 
-    let params = {
+    const loadRange = range(startIndex, stopIndex);
+    this.setState(({ currentlyLoading }) => ({
+      currentlyLoading: currentlyLoading.concat(loadRange),
+    }));
+    const params = {
       counter__gte: startIndex,
       counter__lte: stopIndex,
       order_by: 'start_line',
     };
-
-    return await JobsAPI.readEvents(job.id, job.type, params).then(response => {
-      this.setState(({ results }) => {
+    return JobsAPI.readEvents(job.id, job.type, params).then(response => {
+      this.setState(({ results, currentlyLoading }) => {
         response.data.results.forEach(jobEvent => {
           results[jobEvent.counter] = jobEvent;
         });
-        return { results };
+        return {
+          results,
+          currentlyLoading: currentlyLoading.filter(
+            n => !loadRange.includes(n)
+          ),
+        };
       });
     });
   }
@@ -152,8 +189,8 @@ class JobOutput extends Component {
   handleScrollPrevious() {
     const startIndex = this.listRef.Grid._renderedRowStartIndex;
     const stopIndex = this.listRef.Grid._renderedRowStopIndex;
-    const range = stopIndex - startIndex + 1;
-    this.listRef.scrollToRow(Math.max(0, startIndex - range));
+    const scrollRange = stopIndex - startIndex + 1;
+    this.listRef.scrollToRow(Math.max(0, startIndex - scrollRange));
   }
 
   handleScrollNext() {
@@ -168,7 +205,6 @@ class JobOutput extends Component {
   handleScrollBottom() {
     const { remoteRowCount } = this.state;
     this.listRef.scrollToRow(remoteRowCount - 1);
-    this.setState({ scrollToIndex: remoteRowCount - 1 });
   }
 
   handleResize({ width }) {
@@ -181,12 +217,7 @@ class JobOutput extends Component {
 
   render() {
     const { job } = this.props;
-    const {
-      hasContentLoading,
-      contentError,
-      scrollToIndex,
-      remoteRowCount,
-    } = this.state;
+    const { hasContentLoading, contentError, remoteRowCount } = this.state;
 
     if (hasContentLoading) {
       return <ContentLoading />;
@@ -229,8 +260,8 @@ class JobOutput extends Component {
                       rowHeight={this.cache.rowHeight}
                       rowRenderer={this.rowRenderer}
                       scrollToAlignment="start"
-                      scrollToIndex={scrollToIndex}
                       width={width}
+                      overscanRowCount={20}
                     />
                   );
                 }}