grafana/public/app/plugins/panel/gauge/ValueOptions.tsx

import React, { PureComponent } from 'react';
import { FormGroup, Label, GaugeOptions, PanelOptionsProps, PanelOptionsGroup, Select } from '@grafana/ui';
import UnitPicker from 'app/core/components/Select/UnitPicker';

const statOptions = [
  { value: 'min', label: 'Min' },
  { value: 'max', label: 'Max' },
  { value: 'avg', label: 'Average' },
  { value: 'current', label: 'Current' },
  { value: 'total', label: 'Total' },
  { value: 'name', label: 'Name' },
  { value: 'first', label: 'First' },
  { value: 'delta', label: 'Delta' },
  { value: 'diff', label: 'Difference' },
  { value: 'range', label: 'Range' },
  { value: 'last_time', label: 'Time of last point' },
];

const labelWidth = 6;

export default class ValueOptions extends PureComponent<PanelOptionsProps<GaugeOptions>> {
  onUnitChange = unit => this.props.onChange({ ...this.props.options, unit: unit.value });

  onStatChange = stat => this.props.onChange({ ...this.props.options, stat: stat.value });

  onDecimalChange = event => {
    if (!isNaN(event.target.value)) {
      this.props.onChange({ ...this.props.options, decimals: event.target.value });
    }
  };

  onPrefixChange = event => this.props.onChange({ ...this.props.options, prefix: event.target.value });

  onSuffixChange = event => this.props.onChange({ ...this.props.options, suffix: event.target.value });

  render() {
    const { stat, unit, decimals, prefix, suffix } = this.props.options;

    return (
      <PanelOptionsGroup title="Value">
        <div className="gf-form">
          <Label width={labelWidth}>Stat</Label>
          <Select
            width={12}
            options={statOptions}
            onChange={this.onStatChange}
            value={statOptions.find(option => option.value === stat)}
          />
        </div>
        <div className="gf-form">
          <Label width={labelWidth}>Unit</Label>
          <UnitPicker defaultValue={unit} onChange={this.onUnitChange} />
        </div>
        <FormGroup
          label="Decimals"
          labelWidth={labelWidth}
          inputProps={{
            placeholder: 'auto',
            onChange: event => this.onDecimalChange(event),
            value: decimals || '',
            type: 'number',
          }}
        />
        <FormGroup
          label="Prefix"
          labelWidth={labelWidth}
          inputProps={{
            onChange: event => this.onPrefixChange(event),
            value: prefix || '',
          }}
        />
        <FormGroup
          label="Suffix"
          labelWidth={labelWidth}
          inputProps={{
            onChange: event => this.onSuffixChange(event),
            value: suffix || '',
          }}
        />
      </PanelOptionsGroup>
    );
  }
}