Fix RangeControl mark placement and cursor styles

packages/components/src/range-control/index.js

@@ -99,9 +99,7 @@ function RangeControl(
 
 	const inputSliderValue = isValueReset ? '' : currentValue;
 
-	const rangeFillValue = isValueReset
-		? floatClamp( max / 2, min, max )
-		: value;
+	const rangeFillValue = isValueReset ? ( max - min ) / 2 + min : value;
 
 	const calculatedFillValue = ( ( value - min ) / ( max - min ) ) * 100;
 	const fillValue = isValueReset ? 50 : calculatedFillValue;

packages/components/src/range-control/rail.js

@@ -64,33 +64,33 @@ function useMarks( { marks, min = 0, max = 100, step = 1, value = 0 } ) {
 		return [];
 	}
 
-	const isCustomMarks = Array.isArray( marks );
-
-	const markCount = Math.round( ( max - min ) / step );
-	const marksArray = isCustomMarks
-		? marks
-		: [ ...Array( markCount + 1 ) ].map( ( _, index ) => ( {
-				value: index,
-		  } ) );
-
-	const enhancedMarks = marksArray.map( ( mark, index ) => {
-		const markValue = mark.value !== undefined ? mark.value : value;
+	const range = max - min;
+	if ( ! Array.isArray( marks ) ) {
+		marks = [];
+		const count = 1 + Math.round( range / step );
+		while ( count > marks.push( { value: step * marks.length + min } ) );
+	}
 
+	const placedMarks = [];
+	marks.forEach( ( mark, index ) => {
+		if ( mark.value < min || mark.value > max ) {
+			return;
+		}
 		const key = `mark-${ index }`;
-		const isFilled = markValue * step + min <= value;
-		const offset = `${ ( markValue / markCount ) * 100 }%`;
+		const isFilled = mark.value <= value;
+		const offset = `${ ( ( mark.value - min ) / range ) * 100 }%`;
 
 		const offsetStyle = {
 			[ isRTL ? 'right' : 'left' ]: offset,
 		};
 
-		return {
+		placedMarks.push( {
 			...mark,
 			isFilled,
 			key,
 			style: offsetStyle,
-		};
+		} );
 	} );
 
-	return enhancedMarks;
+	return placedMarks;
 }

packages/components/src/range-control/stories/index.js

@@ -75,6 +75,11 @@ const DefaultExample = () => {
 	);
 };
 
+const RangeControlLabeledByMarksType = ( props ) => {
+	const label = Array.isArray( props.marks ) ? 'Custom' : 'Automatic';
+	return <RangeControl { ...{ ...props, label } } />;
+};
+
 export const _default = () => {
 	return <DefaultExample />;
 };
@@ -131,33 +136,51 @@ export const withReset = () => {
 	return <RangeControlWithState label={ label } allowReset />;
 };
 
-export const customMarks = () => {
-	const marks = [
-		{
-			value: 0,
-			label: '0',
-		},
-		{
-			value: 1,
-			label: '1',
-		},
-		{
-			value: 2,
-			label: '2',
-		},
-		{
-			value: 8,
-			label: '8',
-		},
-		{
-			value: 10,
-			label: '10',
-		},
+export const marks = () => {
+	const marksBase = [
+		{ value: 0, label: '0' },
+		{ value: 1, label: '1' },
+		{ value: 2, label: '2' },
+		{ value: 8, label: '8' },
+		{ value: 10, label: '10' },
+	];
+	const marksWithDecimal = [
+		...marksBase,
+		{ value: 3.5, label: '3.5' },
+		{ value: 5.8, label: '5.8' },
+	];
+	const marksWithNegatives = [
+		...marksBase,
+		{ value: -1, label: '-1' },
+		{ value: -2, label: '-2' },
+		{ value: -4, label: '-4' },
+		{ value: -8, label: '-8' },
 	];
+	const stepInteger = { min: 0, max: 10, step: 1 };
+	const stepDecimal = { min: 0, max: 10, step: 0.1 };
+	const minNegative = { min: -10, max: 10, step: 1 };
+	const rangeNegative = { min: -10, max: -1, step: 1 };
+
+	// use a short alias to keep formatting to fewer lines
+	const Range = RangeControlLabeledByMarksType;
 
 	return (
 		<Wrapper>
-			<RangeControl marks={ marks } min={ 0 } max={ 10 } step={ 1 } />
+			<h2>Integer Step</h2>
+			<Range marks { ...stepInteger } />
+			<Range marks={ marksBase } { ...stepInteger } />
+
+			<h2>Decimal Step</h2>
+			<Range marks { ...stepDecimal } />
+			<Range marks={ marksWithDecimal } { ...stepDecimal } />
+
+			<h2>Negative Minimum</h2>
+			<Range marks { ...minNegative } />
+			<Range marks={ marksWithNegatives } { ...minNegative } />
+
+			<h2>Negative Range</h2>
+			<Range marks { ...rangeNegative } />
+			<Range marks={ marksWithNegatives } { ...rangeNegative } />
 		</Wrapper>
 	);
 };

packages/components/src/range-control/styles/range-control-styles.js

@@ -11,11 +11,11 @@ import NumberControl from '../../number-control';
 import { color, reduceMotion, rtl, space } from '../../utils/style-mixins';
 
 const rangeHeight = () => css( { height: 30, minHeight: 30 } );
+const thumbSize = 20;
 
 export const Root = styled.span`
 	-webkit-tap-highlight-color: transparent;
 	box-sizing: border-box;
-	cursor: pointer;
 	align-items: flex-start;
 	display: inline-flex;
 	justify-content: flex-start;
@@ -115,6 +115,7 @@ export const Track = styled.span`
 export const MarksWrapper = styled.span`
 	box-sizing: border-box;
 	display: block;
+	pointer-events: none;
 	position: relative;
 	width: 100%;
 	user-select: none;
@@ -166,15 +167,15 @@ export const ThumbWrapper = styled.span`
 	align-items: center;
 	box-sizing: border-box;
 	display: flex;
-	height: 20px;
+	height: ${ thumbSize }px;
 	justify-content: center;
 	margin-top: 5px;
 	outline: 0;
 	pointer-events: none;
 	position: absolute;
 	top: 0;
 	user-select: none;
-	width: 20px;
+	width: ${ thumbSize }px;
 
 	${ rtl( { marginLeft: -10 } ) }
 `;
@@ -202,7 +203,6 @@ export const Thumb = styled.span`
 	box-sizing: border-box;
 	height: 100%;
 	outline: 0;
-	pointer-events: none;
 	position: absolute;
 	user-select: none;
 	width: 100%;
@@ -216,13 +216,13 @@ export const InputRange = styled.input`
 	display: block;
 	height: 100%;
 	left: 0;
-	margin: 0;
+	margin: 0 -${ thumbSize / 2 }px;
 	opacity: 0;
 	outline: none;
 	position: absolute;
 	right: 0;
 	top: 0;
-	width: 100%;
+	width: calc( 100% + ${ thumbSize }px );
 `;
 
 const tooltipShow = ( { show } ) => {