chore: render time in the trace viewer log

packages/trace-viewer/src/ui/logTab.css

@@ -0,0 +1,31 @@
+/**
+ * Copyright (c) Microsoft Corporation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+.log-list-duration {
+  display: flex;
+  flex: none;
+  align-items: center;
+  color: var(--vscode-editorCodeLens-foreground);
+  float: right;
+  margin-right: 5px;
+  user-select: none;
+}
+
+.log-list-item {
+  text-wrap: wrap;
+  user-select: text;
+  width: 100%;
+}

packages/trace-viewer/src/ui/logTab.tsx

@@ -18,17 +18,51 @@ import type { ActionTraceEventInContext } from './modelUtil';
 import * as React from 'react';
 import { ListView } from '@web/components/listView';
 import { PlaceholderPanel } from './placeholderPanel';
+import { msToString } from '@web/uiUtils';
+import './logTab.css';
 
-const LogList = ListView<{ message: string, time: number }>;
+const LogList = ListView<{ message: string, time: string }>;
 
 export const LogTab: React.FunctionComponent<{
   action: ActionTraceEventInContext | undefined,
-}> = ({ action }) => {
-  if (!action?.log.length)
+  isLive: boolean | undefined,
+}> = ({ action, isLive }) => {
+  const entries = React.useMemo(() => {
+    if (!action || !action.log.length)
+      return [];
+    const log = action.log;
+    const wallTimeOffset = action.wallTime - action.startTime;
+    const entries: { message: string, time: string }[] = [];
+    for (let i = 0; i < log.length; ++i) {
+      let time = '';
+      if (log[i].time !== -1) {
+        const timeStart = log[i]?.time;
+        if (i + 1 < log.length)
+          time = msToString(log[i + 1].time - timeStart);
+        else if (action.endTime > 0)
+          time = msToString(action.endTime - timeStart);
+        else if (isLive)
+          time = msToString(Date.now() - wallTimeOffset - timeStart);
+        else
+          time = '-';
+      }
+      entries.push({
+        message: log[i].message,
+        time,
+      });
+    }
+    return entries;
+  }, [action]);
+  if (!entries.length)
     return <PlaceholderPanel text='No log entries' />;
+
   return <LogList
     name='log'
-    items={action?.log || []}
-    render={logLine => logLine.message}
+    items={entries}
+    render={entry => <div className='log-list-item'>
+      <span className='log-list-duration'>{entry.time}</span>
+      {entry.message}
+    </div>}
+    noHighlightOnHover={true}
   />;
 };

packages/trace-viewer/src/ui/workbench.tsx

@@ -131,7 +131,7 @@ export const Workbench: React.FunctionComponent<{
   const logTab: TabbedPaneTabModel = {
     id: 'log',
     title: 'Log',
-    render: () => <LogTab action={activeAction} />
+    render: () => <LogTab action={activeAction} isLive={isLive} />
   };
   const errorsTab: TabbedPaneTabModel = {
     id: 'errors',
@@ -199,7 +199,7 @@ export const Workbench: React.FunctionComponent<{
   }, [model]);
 
   let time: number = 0;
-  if (model && model.endTime >= 0)
+  if (!isLive && model && model.endTime >= 0)
     time = model.endTime - model.startTime;
   else if (model && model.wallTime)
     time = Date.now() - model.wallTime;

packages/web/src/components/listView.tsx

@@ -35,6 +35,7 @@ export type ListViewProps<T> = {
   onIconClicked?: (item: T, index: number) => void,
   noItemsMessage?: string,
   dataTestId?: string,
+  noHighlightOnHover?: boolean,
 };
 
 const scrollPositions = new Map<string, number>();
@@ -57,6 +58,7 @@ export function ListView<T>({
   onIconClicked,
   noItemsMessage,
   dataTestId,
+  noHighlightOnHover,
 }: ListViewProps<T>) {
   const itemListRef = React.useRef<HTMLDivElement>(null);
   const [highlightedItem, setHighlightedItem] = React.useState<any>();
@@ -131,7 +133,7 @@ export function ListView<T>({
       {noItemsMessage && items.length === 0 && <div className='list-view-empty'>{noItemsMessage}</div>}
       {items.map((item, index) => {
         const selectedSuffix = selectedItem === item ? ' selected' : '';
-        const highlightedSuffix = highlightedItem === item ? ' highlighted' : '';
+        const highlightedSuffix = !noHighlightOnHover && highlightedItem === item ? ' highlighted' : '';
         const errorSuffix = isError?.(item, index) ? ' error' : '';
         const warningSuffix = isWarning?.(item, index) ? ' warning' : '';
         const indentation = indent?.(item, index) || 0;