rusackas commented on code in PR #42910:
URL: https://github.com/apache/superset/pull/42910#discussion_r4141826549


##########
superset-frontend/src/explore/components/controls/BulletRangeColorsControl/index.tsx:
##########
@@ -0,0 +1,107 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+import { t } from '@apache-superset/core/translation';
+import { styled } from '@apache-superset/core/theme';
+import { Button } from '@superset-ui/core/components';
+import { tokenizeToNumericArray } from '@superset-ui/plugin-chart-echarts';
+import ControlHeader from '../../ControlHeader';
+import ColorPickerControl from '../ColorPickerControl';
+import type { ColorPickerValue } from '../ColorPickerControl';
+import { BulletRangeColorsControlProps } from './types';
+
+const RangeRow = styled.div`
+  display: flex;
+  align-items: center;
+  gap: ${({ theme }) => theme.sizeUnit * 2}px;
+  margin-bottom: ${({ theme }) => theme.sizeUnit}px;
+`;
+
+const RangeLabel = styled.span`
+  min-width: 90px;
+  color: ${({ theme }) => theme.colorTextSecondary};
+  font-size: ${({ theme }) => theme.fontSizeSM}px;
+`;

Review Comment:
   Fair point, extracted the shared row layout (`RangeRow`/`RangeLabel`) and 
the color-array-update logic into `controls/shared/RangeColorRow.tsx`, used by 
both controls now. Kept the legacy-color resolution and reset-button pieces 
separate since those genuinely differ.



##########
superset-frontend/plugins/plugin-chart-echarts/src/BigNumber/BigNumberPeriodOverPeriod/utils.ts:
##########
@@ -74,3 +76,97 @@ export const getHeaderFontSize = (proportionValue: number) =>
 export const getComparisonFontSize = (proportionValue: number) =>
   comparisonFontSizesMapping[proportionValue] ??
   sharedFontSizes[sharedFontSizes.length - 1];
+
+export interface ComparisonColorTokens {
+  /** Color for the arrow indicator and (when the symbol is index 0) text. */
+  text: string;
+  /** Background color for the increase/decrease pill. */
+  background: string;
+  /** Foreground color for the increase/decrease pill's text. */
+  strongText: string;
+}
+
+/**
+ * Resolves the increase/decrease colors to use for rendering, given the
+ * chart's current `increaseColor` / `decreaseColor` (from the
+ * `ColorPickerControl`s added after this became customizable) and the
+ * legacy `comparisonColorScheme` field.
+ *
+ * Charts saved before `increaseColor` / `decreaseColor` existed only have
+ * `comparisonColorScheme`, a 2-choice select ('Green' | 'Red') where 'Green'
+ * meant "green for increase, red for decrease" and 'Red' meant the reverse.
+ * Both legacy choices map onto the same 'Green' | 'Red' semantic token names
+ * used by the new controls' presets, so resolving through it here
+ * reproduces the exact old behavior (including the reversed case) without a
+ * data migration.
+ */
+export const resolveComparisonColorKeys = (
+  comparisonColorScheme: string | undefined,
+  increaseColor: string | undefined,
+  decreaseColor: string | undefined,
+): { increaseColor: string; decreaseColor: string } => {
+  const legacyReversed = comparisonColorScheme === ColorSchemeEnum.Red;
+  return {
+    increaseColor:
+      increaseColor ??
+      (legacyReversed ? ColorSchemeEnum.Red : ColorSchemeEnum.Green),
+    decreaseColor:
+      decreaseColor ??
+      (legacyReversed ? ColorSchemeEnum.Green : ColorSchemeEnum.Red),
+  };
+};
+
+/**
+ * Hex alpha suffix appended to a custom comparison color to build the pill
+ * background tint: 0x1A / 0xFF is roughly 10% opacity.
+ */
+export const COMPARISON_TINT_ALPHA_HEX = '1A';
+
+/**
+ * Resolves a single color value (semantic token name or literal hex from
+ * the color picker) to the (arrow/text, background, strong-text) triad used
+ * across the comparison pills. 'Green' / 'Red' keep using the paired
+ * success/error theme tokens exactly as before these colors were
+ * customizable; any other value is either a theme token name (e.g.
+ * 'colorPrimary', emitted by the picker's `resolveThemeTokens` option) or a
+ * literal hex -- 6-digit, or 8-digit when the alpha-enabled picker is used
+ * -- in which case the background is a light (~10% opacity) tint of that
+ * same color.
+ */
+export const getComparisonColorTokens = (
+  colorValue: string,
+  theme: SupersetTheme,
+): ComparisonColorTokens => {
+  if (colorValue === ColorSchemeEnum.Green) {
+    return {
+      text: theme.colorSuccess,
+      background: theme.colorSuccessBg,
+      strongText: theme.colorSuccessText,
+    };
+  }
+  if (colorValue === ColorSchemeEnum.Red) {
+    return {
+      text: theme.colorError,
+      background: theme.colorErrorBg,
+      strongText: theme.colorErrorText,
+    };
+  }
+  const themeColors = theme as unknown as Record<string, string>;
+  const resolvedColor = Object.prototype.hasOwnProperty.call(
+    themeColors,
+    colorValue,
+  )
+    ? themeColors[colorValue]
+    : colorValue;
+  // An 8-digit hex (alpha-enabled picker) already carries its own alpha
+  // channel; strip it before appending the tint suffix below so the
+  // background stays a valid 8-digit hex instead of stacking a second one.
+  const opaqueColor = /^#[0-9a-f]{8}$/i.test(resolvedColor)
+    ? resolvedColor.slice(0, 7)
+    : resolvedColor;
+  return {
+    text: resolvedColor,
+    background: `${opaqueColor}${COMPARISON_TINT_ALPHA_HEX}`,

Review Comment:
   Good catch, fixed — the tint suffix is now only appended to 6/8-digit hex 
values; anything else (like an rgba token) passes through unchanged. Added a 
regression test in utils.test.ts.



##########
superset-frontend/plugins/plugin-chart-echarts/src/BigNumber/BigNumberPeriodOverPeriod/PopKPI.test.tsx:
##########
@@ -0,0 +1,107 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+import { render, screen } from 'spec/helpers/testing-library';
+import PopKPI from './PopKPI';
+import { PopKPIProps } from './types';
+
+const baseProps: PopKPIProps = {
+  height: 200,
+  width: 400,
+  data: [],
+  metrics: [],
+  metricName: 'Sales',
+  showMetricName: true,
+  headerText: '',
+  boldText: true,
+  bigNumber: '120',
+  prevNumber: '100',
+  valueDifference: '20',
+  percentDifferenceFormattedString: '20%',
+  compType: 'r',
+  percentDifferenceNumber: 0.2,
+  subtitleFontSize: 0.15,
+  shift: '',
+  headerFontSize: 'l',
+  subheaderFontSize: 'm',
+  comparisonColorEnabled: true,
+};
+
+test('renders the up arrow and metric values when the metric increased', () => 
{
+  render(<PopKPI {...baseProps} />);
+
+  expect(screen.getByText('↑')).toBeInTheDocument();
+  expect(screen.getByText('120')).toBeInTheDocument();
+  expect(screen.getByText('Sales')).toBeInTheDocument();
+});
+
+test('renders the down arrow when the metric decreased', () => {
+  render(
+    <PopKPI
+      {...baseProps}
+      percentDifferenceNumber={-0.2}
+      valueDifference="-20"
+    />,
+  );
+
+  expect(screen.getByText('↓')).toBeInTheDocument();
+  expect(screen.getByText('-20')).toBeInTheDocument();
+});
+
+// The precise color resolution (legacy `comparisonColorScheme` fallback,
+// custom hex precedence, the neutral disabled state) is covered by pure
+// unit tests against `resolveComparisonColorKeys` / `getComparisonColorTokens`
+// in utils.test.ts, since emotion's `css` prop styles aren't reliably
+// observable through jsdom's computed styles. These tests instead confirm
+// PopKPI renders without crashing across the same prop combinations.

Review Comment:
   You're right, added a real `toHaveStyleRule` assertion on the arrow 
indicator and fixed the comment.



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