OPIK-21 [UX] Improve UX of the trace component

apps/opik-frontend/src/components/pages/DatasetCompareExperimentsPage/DatasetCompareExperimentsPage.tsx

@@ -24,7 +24,6 @@ import useAppStore from "@/store/AppStore";
 import { useDatasetIdFromURL } from "@/hooks/useDatasetIdFromURL";
 import { DatasetCompareAddExperimentHeader } from "@/components/pages/DatasetCompareExperimentsPage/DatasetCompareAddExperimentHeader";
 import {
-  CELL_VERTICAL_ALIGNMENT,
   COLUMN_TYPE,
   ColumnData,
   OnChangeFn,
@@ -164,21 +163,11 @@ const DatasetCompareExperimentsPage: React.FunctionComponent = () => {
     const retVal = convertColumnDataToColumn<
       ExperimentsCompare,
       ExperimentsCompare
-    >(
-      DEFAULT_COLUMNS.map((c) => {
-        return height === ROW_HEIGHT.small
-          ? {
-              ...c,
-              verticalAlignment: CELL_VERTICAL_ALIGNMENT.start,
-            }
-          : c;
-      }),
-      {
-        columnsWidth,
-        selectedColumns,
-        columnsOrder,
-      },
-    );
+    >(DEFAULT_COLUMNS, {
+      columnsWidth,
+      selectedColumns,
+      columnsOrder,
+    });
 
     experimentsIds.forEach((id: string) => {
       const size = columnsWidth[id] ?? 400;
@@ -204,14 +193,7 @@ const DatasetCompareExperimentsPage: React.FunctionComponent = () => {
     });
 
     return retVal;
-  }, [
-    columnsWidth,
-    selectedColumns,
-    columnsOrder,
-    experimentsIds,
-    setTraceId,
-    height,
-  ]);
+  }, [columnsWidth, selectedColumns, columnsOrder, experimentsIds, setTraceId]);
 
   const { data, isPending } = useCompareExperimentsList(
     {

apps/opik-frontend/src/components/shared/TraceDetailsPanel/TraceTreeViewer/TraceTreeViewer.module.scss

@@ -55,8 +55,8 @@
     height: 100%;
 
     .detailsContainerWithArrow {
-      width: 65%;
-      min-width: 250px;
+      width: var(--details-container-width, 65%);
+      min-width: 100px;
       display: flex;
       position: relative;
 
@@ -163,6 +163,7 @@
     }
 
     .chainSpanOuterContainer {
+      min-width: 150px;
       display: flex;
       flex-direction: column;
       align-items: start;

apps/opik-frontend/src/components/shared/TraceDetailsPanel/TraceTreeViewer/TraceTreeViewer.tsx

@@ -7,7 +7,7 @@ import {
 } from "react-complex-tree";
 import { BASE_TRACE_DATA_TYPE, Span, Trace } from "@/types/traces";
 import { treeRenderers } from "./treeRenderers";
-import { calcDuration } from "@/lib/utils";
+import { calcDuration, getTextWidth } from "@/lib/utils";
 import { SPANS_COLORS_MAP, TRACE_TYPE_FOR_TREE } from "@/constants/traces";
 import { Button } from "@/components/ui/button";
 import useDeepMemo from "@/hooks/useDeepMemo";
@@ -32,6 +32,30 @@ type TraceTreeViewerProps = {
   onSelectRow: (id: string) => void;
 };
 
+type ItemWidthObject = {
+  id: string;
+  name: string;
+  parentId?: string;
+  children: ItemWidthObject[];
+  level?: number;
+};
+
+const getSpansWithLevel = (
+  item: ItemWidthObject,
+  accumulator: ItemWidthObject[] = [],
+  level = 0,
+) => {
+  accumulator.push({
+    ...item,
+    level,
+  });
+
+  if (item.children) {
+    item.children.forEach((i) => getSpansWithLevel(i, accumulator, level + 1));
+  }
+  return accumulator;
+};
+
 const TraceTreeViewer: React.FunctionComponent<TraceTreeViewerProps> = ({
   trace,
   spans,
@@ -133,7 +157,7 @@ const TraceTreeViewer: React.FunctionComponent<TraceTreeViewerProps> = ({
         retVal[directParentKey].children?.push(span.id);
       }
       return retVal;
-    }, acc);
+    });
 
     return retVal;
   }, [trace, traceSpans]);
@@ -148,8 +172,64 @@ const TraceTreeViewer: React.FunctionComponent<TraceTreeViewerProps> = ({
     [rowId, expandedTraceSpans],
   );
 
+  const maxWidth = useMemo(() => {
+    const map: Record<string, number> = {};
+    const list: ItemWidthObject[] = traceSpans.map((s) => ({
+      id: s.id,
+      name: s.name || "",
+      parentId: s.parent_span_id,
+      children: [],
+    }));
+    const rootElement: ItemWidthObject = {
+      id: trace.id,
+      name: trace.name,
+      children: [],
+      level: 1,
+    };
+
+    list.forEach((item, index) => {
+      map[item.id] = index;
+    });
+
+    list.forEach((item) => {
+      if (item.parentId) {
+        list[map[item.parentId]].children.push(item);
+      } else {
+        rootElement.children.push(item);
+      }
+    });
+
+    const items = getSpansWithLevel(rootElement, [], 2);
+
+    const widthArray = getTextWidth(
+      items.map((i) => i.name),
+      { font: "14px Inter" },
+    );
+
+    const OTHER_SPACE = 52;
+    const LEVEL_WIDTH = 16;
+
+    return Math.ceil(
+      Math.max(
+        ...items.map(
+          (i, index) =>
+            OTHER_SPACE +
+            (i.level || 1) * LEVEL_WIDTH +
+            widthArray[index] * 1.03, //where 1.03 Letter spacing compensation
+        ),
+      ),
+    );
+  }, [traceSpans, trace]);
+
   return (
-    <div className="size-full max-w-full overflow-auto py-4">
+    <div
+      className="size-full max-w-full overflow-auto py-4"
+      style={
+        {
+          "--details-container-width": `${maxWidth}px`,
+        } as React.CSSProperties
+      }
+    >
       <div className="min-w-[400px] max-w-full overflow-x-hidden">
         <div className="flex flex-row items-end gap-2 px-6 py-2">
           <div className="comet-title-m">Trace spans</div>

apps/opik-frontend/src/lib/utils.ts

@@ -35,3 +35,19 @@ export const millisecondsToSeconds = (milliseconds: number) => {
   // rounds with precision, one character after the point
   return round(milliseconds / 1000, 1);
 };
+
+export const getTextWidth = (
+  text: string[],
+  properties: {
+    font?: string;
+  } = {},
+) => {
+  const canvas = document.createElement("canvas");
+  const context = canvas.getContext("2d") as CanvasRenderingContext2D;
+
+  if (properties.font) {
+    context.font = properties.font;
+  }
+
+  return text.map((v) => context.measureText(v).width);
+};