chore: trace viewer UX (auto scroll to action + timeline duration) (#20001)

Fixes https://github.com/microsoft/playwright/issues/19916

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

@@ -72,28 +72,55 @@ export const ActionList: React.FC<ActionListProps> = ({
             newIndex = Math.max(index - 1, 0);
         }
         const element = actionListRef.current?.children.item(newIndex);
-        if ((element as any)?.scrollIntoViewIfNeeded)
-          (element as any).scrollIntoViewIfNeeded(false);
-        else
-          element?.scrollIntoView();
+        scrollIntoViewIfNeeded(element);
         onSelected(actions[newIndex]);
       }}
       ref={actionListRef}
     >
       {actions.length === 0 && <div className='no-actions-entry'>No actions recorded</div>}
-      {actions.map(action => {
+      {actions.map(action => <ActionListItem
+        action={action}
+        highlightedAction={highlightedAction}
+        onSelected={onSelected}
+        onHighlighted={onHighlighted}
+        selectedAction={selectedAction}
+        sdkLanguage={sdkLanguage}
+        setSelectedTab={setSelectedTab}
+      />)}
+    </div>
+  </div>;
+};
+
+const ActionListItem: React.FC<{
+  action: ActionTraceEvent,
+  highlightedAction: ActionTraceEvent | undefined,
+  onSelected: (action: ActionTraceEvent) => void,
+  onHighlighted: (action: ActionTraceEvent | undefined) => void,
+  selectedAction: ActionTraceEvent | undefined,
+  sdkLanguage: Language | undefined,
+  setSelectedTab: (tab: string) => void,
+}> = ({ action, onSelected, onHighlighted, highlightedAction, selectedAction, sdkLanguage, setSelectedTab }) => {
   const { metadata } = action;
   const selectedSuffix = action === selectedAction ? ' selected' : '';
   const highlightedSuffix = action === highlightedAction ? ' highlighted' : '';
   const error = metadata.error?.error?.message;
   const { errors, warnings } = modelUtil.stats(action);
   const locator = metadata.params.selector ? asLocator(sdkLanguage || 'javascript', metadata.params.selector) : undefined;
+
+  const divRef = React.useRef<HTMLDivElement>(null);
+
+  React.useEffect(() => {
+    if (divRef.current && selectedAction === action)
+      scrollIntoViewIfNeeded(divRef.current);
+  }, [selectedAction, action]);
+
   return <div
     className={'action-entry' + selectedSuffix + highlightedSuffix}
     key={metadata.id}
     onClick={() => onSelected(action)}
     onMouseEnter={() => onHighlighted(action)}
     onMouseLeave={() => (highlightedAction === action) && onHighlighted(undefined)}
+    ref={divRef}
   >
     <div className='action-title'>
       <span>{metadata.apiName}</span>
@@ -107,7 +134,13 @@ export const ActionList: React.FC<ActionListProps> = ({
     </div>
     {error && <div className='codicon codicon-issues' title={error} />}
   </div>;
-      })}
-    </div>
-  </div>;
 };
+
+function scrollIntoViewIfNeeded(element?: Element | null) {
+  if (!element)
+    return;
+  if ((element as any)?.scrollIntoViewIfNeeded)
+    (element as any).scrollIntoViewIfNeeded(false);
+  else
+    element?.scrollIntoView();
+}

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

@@ -33,6 +33,7 @@ type TimelineBar = {
   rightTime: number;
   type: string;
   label: string;
+  title: string;
   className: string;
 };
 
@@ -67,6 +68,7 @@ export const Timeline: React.FunctionComponent<{
         leftPosition: timeToPosition(measure.width, boundaries, entry.metadata.startTime),
         rightPosition: timeToPosition(measure.width, boundaries, entry.metadata.endTime),
         label: entry.metadata.apiName + ' ' + detail,
+        title: entry.metadata.endTime ? msToString(entry.metadata.endTime - entry.metadata.startTime) : 'Timed Out',
         type: entry.metadata.type + '.' + entry.metadata.method,
         className: `${entry.metadata.type}_${entry.metadata.method}`.toLowerCase()
       });
@@ -81,6 +83,7 @@ export const Timeline: React.FunctionComponent<{
         leftPosition: timeToPosition(measure.width, boundaries, startTime),
         rightPosition: timeToPosition(measure.width, boundaries, startTime),
         label: event.metadata.method,
+        title: event.metadata.endTime ? msToString(event.metadata.endTime - event.metadata.startTime) : 'Timed Out',
         type: event.metadata.type + '.' + event.metadata.method,
         className: `${event.metadata.type}_${event.metadata.method}`.toLowerCase()
       });
@@ -183,6 +186,7 @@ export const Timeline: React.FunctionComponent<{
             width: Math.max(1, bar.rightPosition - bar.leftPosition) + 'px',
             top: barTop(bar) + 'px',
           }}
+          title={bar.title}
         ></div>;
       })
     }</div>