Singlestat-v2/Gauge: Show title when repeating (#16477)

* show title in singlestat2

* show title in gauge

* use CSS class for emotion

* use emotion not scss

packages/grafana-ui/src/components/BigValue/BigValue.tsx

 // Library
 import React, { PureComponent, ReactNode, CSSProperties } from 'react';
 import $ from 'jquery';
+import { css } from 'emotion';
 
 // Utils
 import { getColorFromHexRgbOrName } from '../../utils';
@@ -98,36 +99,67 @@ export class BigValue extends PureComponent<Props> {
     return <span style={css}>{value.text}</span>;
   };
 
-  render() {
-    const { height, width, value, prefix, suffix, sparkline, backgroundColor } = this.props;
+  renderSparkline(sparkline: BigValueSparkline) {
+    const { height, width } = this.props;
 
     const plotCss: CSSProperties = {};
     plotCss.position = 'absolute';
+    plotCss.bottom = '0px';
+    plotCss.left = '0px';
+    plotCss.width = width + 'px';
 
-    if (sparkline) {
     if (sparkline.full) {
-        plotCss.bottom = '5px';
-        plotCss.left = '-5px';
-        plotCss.width = width - 10 + 'px';
       const dynamicHeightMargin = height <= 100 ? 5 : Math.round(height / 100) * 15 + 5;
       plotCss.height = height - dynamicHeightMargin + 'px';
     } else {
-        plotCss.bottom = '0px';
-        plotCss.left = '-5px';
-        plotCss.width = width - 10 + 'px';
       plotCss.height = Math.floor(height * 0.25) + 'px';
     }
+    return <div style={plotCss} ref={element => (this.canvasElement = element)} />;
   }
 
+  render() {
+    const { height, width, value, prefix, suffix, sparkline, backgroundColor } = this.props;
+
     return (
-      <div className="big-value" style={{ width, height, backgroundColor }}>
-        <span className="big-value__value">
+      <div
+        className={css({
+          position: 'relative',
+          display: 'table',
+        })}
+        style={{ width, height, backgroundColor }}
+      >
+        {value.title && (
+          <div
+            className={css({
+              lineHeight: 1,
+              textAlign: 'center',
+              zIndex: 1,
+              display: 'block',
+              width: '100%',
+              position: 'absolute',
+            })}
+          >
+            {value.title}
+          </div>
+        )}
+        <span
+          className={css({
+            lineHeight: 1,
+            textAlign: 'center',
+            zIndex: 1,
+            display: 'table-cell',
+            verticalAlign: 'middle',
+            position: 'relative',
+            fontSize: '3em',
+            fontWeight: 500, // TODO: $font-weight-semi-bold
+          })}
+        >
           {this.renderText(prefix, '0px 2px 0px 0px')}
           {this.renderText(value)}
           {this.renderText(suffix)}
         </span>
 
-        {sparkline && <div style={plotCss} ref={element => (this.canvasElement = element)} />}
+        {sparkline && this.renderSparkline(sparkline)}
       </div>
     );
   }

packages/grafana-ui/src/components/BigValue/_BigValue.scss

-.big-value {
-  position: relative;
-  display: table;
-}
-
-.big-value__value {
-  line-height: 1;
-  display: table-cell;
-  vertical-align: middle;
-  text-align: center;
-  position: relative;
-  z-index: 1;
-  font-size: 3em;
-  font-weight: $font-weight-semi-bold;
-}

packages/grafana-ui/src/components/Gauge/Gauge.tsx

 import React, { PureComponent } from 'react';
 import $ from 'jquery';
+import { css } from 'emotion';
 import { getColorFromHexRgbOrName } from '../../utils';
 import { DisplayValue, Threshold, GrafanaThemeType, Themeable } from '../../types';
 
@@ -119,18 +120,31 @@ export class Gauge extends PureComponent<Props> {
   }
 
   render() {
-    const { height, width } = this.props;
+    const { height, width, value } = this.props;
 
     return (
       <div
         style={{
           height: `${Math.min(height, width * 1.3)}px`,
           width: `${Math.min(width, height * 1.3)}px`,
-          top: '10px',
           margin: 'auto',
+          marginTop: '-8px',
         }}
         ref={element => (this.canvasElement = element)}
-      />
+      >
+        {value.title && (
+          <div
+            className={css({
+              textAlign: 'center',
+              bottom: -8,
+              width: '100%',
+              position: 'absolute',
+            })}
+          >
+            {value.title}
+          </div>
+        )}
+      </div>
     );
   }
 }

packages/grafana-ui/src/components/SingleStatShared/shared.ts

@@ -74,7 +74,9 @@ export const getSingleStatDisplayValues = (options: GetSingleStatDisplayValueOpt
           });
 
           const displayValue = display(stats[stat]);
-          displayValue.title = series.name;
+          if (series.name) {
+            displayValue.title = replaceVariables(series.name);
+          }
           values.push(displayValue);
         }
       }
@@ -86,6 +88,9 @@ export const getSingleStatDisplayValues = (options: GetSingleStatDisplayValueOpt
       numeric: 0,
       text: 'No data',
     });
+  } else if (values.length === 1) {
+    // Don't show title for single item
+    values[0].title = undefined;
   }
 
   return values;

packages/grafana-ui/src/components/index.scss

 @import 'CustomScrollbar/CustomScrollbar';
-@import 'BigValue/BigValue';
 @import 'DeleteButton/DeleteButton';
 @import 'ThresholdsEditor/ThresholdsEditor';
 @import 'Table/Table';

public/app/plugins/panel/singlestat2/SingleStatPanel.tsx

@@ -55,10 +55,10 @@ export class SingleStatPanel extends PureComponent<PanelProps<SingleStatOptions>
       const timeColumn = sparkline.show ? getFirstTimeField(series) : -1;
 
       for (let i = 0; i < series.fields.length; i++) {
-        const column = series.fields[i];
+        const field = series.fields[i];
 
         // Show all fields that are not 'time'
-        if (column.type === FieldType.number) {
+        if (field.type === FieldType.number) {
           const stats = calculateStats({
             series,
             fieldIndex: i,
@@ -69,6 +69,7 @@ export class SingleStatPanel extends PureComponent<PanelProps<SingleStatOptions>
           const v: SingleStatDisplay = {
             value: display(stats[stat]),
           };
+          v.value.title = replaceVariables(field.name);
 
           const color = v.value.color;
           if (!colorValue) {
@@ -121,6 +122,11 @@ export class SingleStatPanel extends PureComponent<PanelProps<SingleStatOptions>
       }
     }
 
+    // Don't show a title if there is only one item
+    if (values.length === 1) {
+      values[0].value.title = null;
+    }
+
     return values;
   };