Heatmap: hover legend regardless of tooltip state (#47600)

public/app/features/transformers/calculateHeatmap/heatmap.ts

@@ -220,7 +220,9 @@ export function calculateHeatmapFromData(frames: DataFrame[], options: HeatmapCa
         name: 'count',
         type: FieldType.number,
         values: new ArrayVector(heat2d.count),
-        config: {},
+        config: {
+          unit: 'short', // always integer
+        },
       },
     ],
   };

public/app/plugins/panel/heatmap-new/HeatmapHoverView.tsx

@@ -1,5 +1,5 @@
 import React, { useEffect, useRef } from 'react';
-import { Field, FieldType, formattedValueToString, LinkModel } from '@grafana/data';
+import { Field, FieldType, formattedValueToString, getFieldDisplayName, LinkModel } from '@grafana/data';
 
 import { HeatmapHoverEvent } from './utils';
 import { BucketLayout, HeatmapData } from './fields';
@@ -26,7 +26,7 @@ export const HeatmapHoverView = ({ data, hover, showHistogram }: Props) => {
       const dashboard = getDashboardSrv().getCurrent();
       return dashboard?.formatDate(v, tooltipTimeFormat);
     }
-    return `${v}XX`;
+    return `${v}`;
   };
 
   const xVals = xField?.values.toArray();
@@ -45,7 +45,7 @@ export const HeatmapHoverView = ({ data, hover, showHistogram }: Props) => {
       if (yField?.display) {
         return formattedValueToString(yField.display(v));
       }
-      return `${v}YYY`;
+      return `${v}`;
     };
   }
 
@@ -170,7 +170,9 @@ export const HeatmapHoverView = ({ data, hover, showHistogram }: Props) => {
         <div>
           Bucket: {yDisp(yBucketMin)} - {yDisp(yBucketMax)}
         </div>
-        <div>Count: {count}</div>
+        <div>
+          {getFieldDisplayName(countField!, data.heatmap)}: {count}
+        </div>
       </div>
       {links.length > 0 && (
         <VerticalGroup>

public/app/plugins/panel/heatmap-new/HeatmapPanel.tsx

@@ -1,6 +1,6 @@
 import React, { useCallback, useMemo, useRef, useState } from 'react';
 import { css } from '@emotion/css';
-import { formattedValueToString, GrafanaTheme2, PanelProps, reduceField, ReducerID, TimeRange } from '@grafana/data';
+import { GrafanaTheme2, PanelProps, reduceField, ReducerID, TimeRange } from '@grafana/data';
 import {
   Portal,
   UPlotChart,
@@ -82,7 +82,7 @@ export const HeatmapPanel: React.FC<HeatmapPanelProps> = ({
     return prepConfig({
       dataRef,
       theme,
-      onhover: options.tooltip.show ? onhover : null,
+      onhover: onhover,
       onclick: options.tooltip.show ? onclick : null,
       onzoom: (evt) => {
         onChangeTimeRange({ from: evt.xMin, to: evt.xMax });
@@ -104,7 +104,6 @@ export const HeatmapPanel: React.FC<HeatmapPanelProps> = ({
 
     const field = info.heatmap.fields[2];
     const { min, max } = reduceField({ field, reducers: [ReducerID.min, ReducerID.max] });
-    const display = field.display ? (v: number) => formattedValueToString(field.display!(v)) : (v: number) => `${v}`;
 
     let hoverValue: number | undefined = undefined;
     if (hover && info.heatmap.fields) {
@@ -114,7 +113,7 @@ export const HeatmapPanel: React.FC<HeatmapPanelProps> = ({
 
     return (
       <VizLayout.Legend placement="bottom" maxHeight="20%">
-        <ColorScale hoverValue={hoverValue} colorPalette={palette} min={min} max={max} display={display} />
+        <ColorScale hoverValue={hoverValue} colorPalette={palette} min={min} max={max} display={info.display} />
       </VizLayout.Legend>
     );
   };
@@ -133,7 +132,7 @@ export const HeatmapPanel: React.FC<HeatmapPanelProps> = ({
         )}
       </VizLayout>
       <Portal>
-        {hover && (
+        {hover && options.tooltip.show && (
           <VizTooltipContainer
             position={{ x: hover.pageX, y: hover.pageY }}
             offset={{ x: 10, y: 10 }}

public/app/plugins/panel/heatmap-new/fields.ts

@@ -2,8 +2,10 @@ import {
   DataFrame,
   DataFrameType,
   FieldType,
+  formattedValueToString,
   getDisplayProcessor,
   getFieldDisplayName,
+  getValueFormat,
   GrafanaTheme2,
 } from '@grafana/data';
 import { calculateHeatmapFromData, bucketsToScanlines } from 'app/features/transformers/calculateHeatmap/heatmap';
@@ -29,6 +31,9 @@ export interface HeatmapData {
   xLayout?: BucketLayout;
   yLayout?: BucketLayout;
 
+  // Print a heatmap cell value
+  display?: (v: number) => string;
+
   // Errors
   warning?: string;
 }
@@ -84,6 +89,7 @@ const getHeatmapData = (frame: DataFrame, theme: GrafanaTheme2): HeatmapData =>
     return { heatmap: frame };
   }
 
+  // Y field values (display is used in the axis)
   if (!frame.fields[1].display) {
     frame.fields[1].display = getDisplayProcessor({ field: frame.fields[1], theme });
   }
@@ -105,14 +111,19 @@ const getHeatmapData = (frame: DataFrame, theme: GrafanaTheme2): HeatmapData =>
   let yBinIncr = ys[1] - ys[0];
   let xBinIncr = xs[yBinQty] - xs[0];
 
+  // The "count" field
+  const disp = frame.fields[2].display ?? getValueFormat('short');
   return {
     heatmap: frame,
     xBucketSize: xBinIncr,
     yBucketSize: yBinIncr,
     xBucketCount: xBinQty,
     yBucketCount: yBinQty,
+
     // TODO: improve heuristic
     xLayout: frame.fields[0].name === 'xMax' ? BucketLayout.le : BucketLayout.ge,
     yLayout: frame.fields[1].name === 'yMax' ? BucketLayout.le : BucketLayout.ge,
+
+    display: (v) => formattedValueToString(disp(v)),
   };
 };