feat: Add LabelCustomColor component (migtools#125)

* Initial implementation Signed-off-by: Mike Turley <[email protected]> * All in on tinycolor2 instead of linear-gradient Signed-off-by: Mike Turley <[email protected]> * Tuning brightness Signed-off-by: Mike Turley <[email protected]> * Remove @types/react-color because it does something weird to the built-in ReactNode type Signed-off-by: Mike Turley <[email protected]> * Tuning brightness Signed-off-by: Mike Turley <[email protected]> * Tuning brightness some more Signed-off-by: Mike Turley <[email protected]> * Properly export Signed-off-by: Mike Turley <[email protected]> * Handle extra props, add examples from Tackle Signed-off-by: Mike Turley <[email protected]> * Update docs paragraph Signed-off-by: Mike Turley <[email protected]> * Better margins in second example Signed-off-by: Mike Turley <[email protected]> * Use the readability functions in tinycolor2 Signed-off-by: Mike Turley <[email protected]> * Nits Signed-off-by: Mike Turley <[email protected]> * Cleanup Signed-off-by: Mike Turley <[email protected]> * Introduce a cache, perf test example, and better description Signed-off-by: Mike Turley <[email protected]> * More notes for the doc Signed-off-by: Mike Turley <[email protected]> * Fix WCAG URL Signed-off-by: Mike Turley <[email protected]> --------- Signed-off-by: Mike Turley <[email protected]>
patternfly-extension-testing · Mar 22, 2023 · 9817e08 · 9817e08
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diff --git a/package.json b/package.json
@@ -73,6 +73,7 @@
     "postcss": "^8.2.13",
     "prettier": "^2.2.1",
     "react": "^17.0.1",
+    "react-color": "^2.19.3",
     "react-dom": "^17.0.1",
     "react-is": "^17.0.1",
     "rimraf": "^3.0.2",
@@ -94,6 +95,7 @@
   "dependencies": {
     "@tanstack/react-query": "^4.26.1",
     "fast-deep-equal": "^3.1.3",
+    "tinycolor2": "^1.6.0",
     "yup": "^0.32.9"
   }
 }
diff --git a/src/components/LabelCustomColor/LabelCustomColor.stories.mdx b/src/components/LabelCustomColor/LabelCustomColor.stories.mdx
@@ -0,0 +1,56 @@
+import { Meta, Story, Canvas, ArgsTable } from '@storybook/addon-docs/blocks';
+import { LabelCustomColor } from './LabelCustomColor';
+import {
+  LabelCustomColorPicker,
+  LabelCustomColorExamples,
+  LabelCustomColorPerfTest,
+} from './LabelCustomColor.stories.tsx';
+import GithubLink from '../../../.storybook/helpers/GithubLink';
+
+<Meta title="Components/LabelCustomColor" component={LabelCustomColor} />
+
+# LabelCustomColor
+
+A wrapper for PatternFly's <a href="https://www.patternfly.org/v4/components/label">Label</a> component that supports
+arbitrary custom CSS colors (e.g. hexadecimal) and ensures text will always be readable.
+
+Applying an arbitrary color to a label presents the possibility of unreadable text due to insufficient color contrast.
+This component solves the issue by applying the given color as a border color and using the
+[tinycolor2](https://www.npmjs.com/package/tinycolor2) library to determine a lightened background color and darkened
+text color (if necessary) in order to reach a color contrast ratio of at least 7:1. This ratio meets the "level AAA"
+requirement of the [Web Content Accessibility Guidelines (WCAG)](https://www.w3.org/WAI/WCAG21/Understanding/contrast-enhanced).
+
+**Note: This adjustment means that multiple labels with very similar colors (especially dark colors) may be adjusted to look almost identical.**
+
+All props of PatternFly's Label component are supported except the `variant` prop (only the default "filled" variant is supported).
+
+## Examples
+
+### Arbitrary Color Picker
+
+Choose any color here to see how the readability adjustments apply to it.
+
+<Canvas>
+  <Story story={LabelCustomColorPicker} />
+</Canvas>
+
+### Color Examples
+
+<Canvas>
+  <Story story={LabelCustomColorExamples} />
+</Canvas>
+
+### Performance Test
+
+The component maintains a global cache of the readability adjustments it makes for each color.
+If labels of the same color are rendered multiple times on a page, each color only needs to be processed once.
+
+<Canvas>
+  <Story story={LabelCustomColorPerfTest} />
+</Canvas>
+
+## Props
+
+<ArgsTable of={LabelCustomColor} />
+
+<GithubLink path="src/components/LabelCustomColor/LabelCustomColor.tsx" />
diff --git a/src/components/LabelCustomColor/LabelCustomColor.stories.tsx b/src/components/LabelCustomColor/LabelCustomColor.stories.tsx
@@ -0,0 +1,82 @@
+import * as React from 'react';
+import { SketchPicker } from 'react-color';
+import spacing from '@patternfly/react-styles/css/utilities/Spacing/spacing';
+import { LabelCustomColor } from './LabelCustomColor';
+
+export const LabelCustomColorPicker: React.FC = () => {
+  const [color, setColor] = React.useState('#4A90E2');
+  return (
+    <>
+      <LabelCustomColor color={color}>Label Text Here</LabelCustomColor>
+      <br />
+      <br />
+      <SketchPicker color={color} onChangeComplete={(newColor) => setColor(newColor.hex)} />
+    </>
+  );
+};
+
+// Colors from https://github.com/konveyor/tackle2-hub/blob/main/migration/v3/seed/main.go#L331-L766
+const EXAMPLE_COLORS = [
+  '#773CF3',
+  '#74F33C',
+  '#F33CA9',
+  '#3CF342',
+  '#4EF33C',
+  '#F33CE6',
+  '#F3AC3C',
+  '#3CF367',
+  '#F3D23C',
+  '#B43CF3',
+  '#F3493C',
+  '#3C65F3',
+  '#3CF3E1',
+  '#3CF3A4',
+  '#F33C47',
+  '#F36F3C',
+  '#B1F33C',
+  '#F3E93C',
+  '#3C7CF3',
+  '#3C3FF3',
+  '#3CDFF3',
+  '#F33C6C',
+  '#D93CF3',
+  '#3CF37F',
+  '#3CF3CA',
+  '#F33CCF',
+  '#9AF33C',
+  '#F3953C',
+  '#D7F33C',
+  '#3CA2F3',
+  '#9C3CF3',
+];
+
+export const LabelCustomColorExamples: React.FC = () => (
+  <>
+    {EXAMPLE_COLORS.map((color) => (
+      <LabelCustomColor key={color} color={color} className={spacing.mXs}>
+        {color}
+      </LabelCustomColor>
+    ))}
+  </>
+);
+
+export const LabelCustomColorPerfTest: React.FC = () => (
+  <>
+    {[
+      ...EXAMPLE_COLORS,
+      ...EXAMPLE_COLORS,
+      ...EXAMPLE_COLORS,
+      ...EXAMPLE_COLORS,
+      ...EXAMPLE_COLORS,
+      ...EXAMPLE_COLORS,
+      ...EXAMPLE_COLORS,
+      ...EXAMPLE_COLORS,
+      ...EXAMPLE_COLORS,
+      ...EXAMPLE_COLORS,
+    ].map((color, index) => (
+      <LabelCustomColor key={`${index}-${color}`} color={color} className={spacing.mXs}>
+        {color}
+      </LabelCustomColor>
+    ))}
+  </>
+);
diff --git a/src/components/LabelCustomColor/LabelCustomColor.tsx b/src/components/LabelCustomColor/LabelCustomColor.tsx
@@ -0,0 +1,71 @@
+import * as React from 'react';
+import { Label, LabelProps } from '@patternfly/react-core';
+import tinycolor from 'tinycolor2';
+
+// Omit the variant prop, we won't support the outline variant
+export interface ILabelCustomColorProps extends Omit<LabelProps, 'variant' | 'color'> {
+  color: string;
+}
+
+const globalColorCache: Record<
+  string,
+  { borderColor: string; backgroundColor: string; textColor: string }
+> = {};
+
+export const LabelCustomColor: React.FC<ILabelCustomColorProps> = ({ color, ...props }) => {
+  const { borderColor, backgroundColor, textColor } = React.useMemo(() => {
+    if (globalColorCache[color]) return globalColorCache[color];
+    // Lighten the background 25%, and lighten it further if necessary until it can support readable text
+    const bgColorObj = tinycolor(color).lighten(25);
+    const blackTextReadability = () => tinycolor.readability(bgColorObj, '#000000');
+    const whiteTextReadability = () => tinycolor.readability(bgColorObj, '#FFFFFF');
+    while (blackTextReadability() < 9 && whiteTextReadability() < 9) {
+      bgColorObj.lighten(5);
+    }
+    // Darken or lighten the text color until it is sufficiently readable
+    const textColorObj = tinycolor(color);
+    while (tinycolor.readability(bgColorObj, textColorObj) < 7) {
+      if (blackTextReadability() > whiteTextReadability()) {
+        textColorObj.darken(5);
+      } else {
+        textColorObj.lighten(5);
+      }
+    }
+    globalColorCache[color] = {
+      borderColor: color,
+      backgroundColor: bgColorObj.toString(),
+      textColor: textColorObj.toString(),
+    };
+    return globalColorCache[color];
+  }, [color]);
+  return (
+    <Label
+      style={
+        {
+          '--pf-c-label__content--before--BorderColor': borderColor,
+          '--pf-c-label__content--link--hover--before--BorderColor': borderColor,
+          '--pf-c-label__content--link--focus--before--BorderColor': borderColor,
+          '--pf-c-label--BackgroundColor': backgroundColor,
+          '--pf-c-label__icon--Color': textColor,
+          '--pf-c-label__content--Color': textColor,
+        } as React.CSSProperties
+      }
+      {...props}
+    />
+  );
+};
+
+/*
+
+Note: if we were to support the outline variant of Label,
+we would need to account for the following additional CSS variables:
+
+--pf-c-label--m-outline__content--Color
+--pf-c-label--m-outline__content--before--BorderColor
+--pf-c-label--m-outline__content--link--hover--before--BorderColor
+--pf-c-label--m-outline__content--link--focus--before--BorderColor
+--pf-c-label--m-editable__content--before--BorderColor
+--pf-c-label--m-editable__content--hover--before--BorderColor
+--pf-c-label--m-editable__content--focus--before--BorderColor
+
+*/
diff --git a/src/components/LabelCustomColor/index.ts b/src/components/LabelCustomColor/index.ts
@@ -0,0 +1 @@
+export * from './LabelCustomColor';
diff --git a/src/index.ts b/src/index.ts
@@ -2,6 +2,7 @@ export * from './components/StatusIcon';
 export * from './components/ValidatedTextInput';
 export * from './components/ResolvedQuery';
 export * from './components/LoadingEmptyState';
+export * from './components/LabelCustomColor';
 
 export * from './hooks/useSelectionState';
 export * from './hooks/useFormState';