[Slider] Add a custom scale support

docs/pages/api/slider.md

@@ -41,6 +41,7 @@ You can learn more about the difference by [reading this guide](/guides/minimizi
 | <span class="prop-name">onChange</span> | <span class="prop-type">func</span> |  | Callback function that is fired when the slider's value changed.<br><br>**Signature:**<br>`function(event: object, value: any) => void`<br>*event:* The event source of the callback.<br>*value:* The new value. |
 | <span class="prop-name">onChangeCommitted</span> | <span class="prop-type">func</span> |  | Callback function that is fired when the `mouseup` is triggered.<br><br>**Signature:**<br>`function(event: object, value: any) => void`<br>*event:* The event source of the callback.<br>*value:* The new value. |
 | <span class="prop-name">orientation</span> | <span class="prop-type">'horizontal'<br>&#124;&nbsp;'vertical'</span> | <span class="prop-default">'horizontal'</span> | The slider orientation. |
+| <span class="prop-name">scale</span> | <span class="prop-type">func</span> | <span class="prop-default">x => x</span> | A transformation function, to change the scale of the slider. |
 | <span class="prop-name">step</span> | <span class="prop-type">number</span> | <span class="prop-default">1</span> | The granularity with which the slider can step through values. (A "discrete" slider.) The `min` prop serves as the origin for the valid values. We recommend (max - min) to be evenly divisible by the step.<br>When step is `null`, the thumb can only be slid onto marks provided with the `marks` prop. |
 | <span class="prop-name">ThumbComponent</span> | <span class="prop-type">elementType</span> | <span class="prop-default">'span'</span> | The component used to display the value label. |
 | <span class="prop-name">track</span> | <span class="prop-type">'normal'<br>&#124;&nbsp;false<br>&#124;&nbsp;'inverted'</span> | <span class="prop-default">'normal'</span> | The track presentation:<br>- `normal` the track will render a bar representing the slider value. - `inverted` the track will render a bar representing the remaining slider value. - `false` the track will render without a bar. |

docs/src/pages/components/slider/NonLinearSlider.js

@@ -0,0 +1,39 @@
+import React from 'react';
+import Typography from '@material-ui/core/Typography';
+import Slider from '@material-ui/core/Slider';
+
+function valueLabelFormat(value) {
+  const [coefficient, exponent] = value
+    .toExponential()
+    .split('e')
+    .map(item => Number(item));
+  return `${Math.round(coefficient)}e^${exponent}`;
+}
+
+export default function NonLinearSlider() {
+  const [value, setValue] = React.useState(1);
+
+  const handleChange = (event, newValue) => {
+    setValue(newValue);
+  };
+
+  return (
+    <div>
+      <Typography id="non-linear-slider" gutterBottom>
+        Temperature range
+      </Typography>
+      <Slider
+        value={value}
+        min={0}
+        step={0.1}
+        max={6}
+        scale={x => x ** 10}
+        getAriaValueText={valueLabelFormat}
+        valueLabelFormat={valueLabelFormat}
+        onChange={handleChange}
+        valueLabelDisplay="auto"
+        aria-labelledby="non-linear-slider"
+      />
+    </div>
+  );
+}

docs/src/pages/components/slider/NonLinearSlider.tsx

@@ -0,0 +1,39 @@
+import React from 'react';
+import Typography from '@material-ui/core/Typography';
+import Slider from '@material-ui/core/Slider';
+
+function valueLabelFormat(value: number) {
+  const [coefficient, exponent] = value
+    .toExponential()
+    .split('e')
+    .map(item => Number(item));
+  return `${Math.round(coefficient)}e^${exponent}`;
+}
+
+export default function NonLinearSlider() {
+  const [value, setValue] = React.useState<number | number[]>(1);
+
+  const handleChange = (event: any, newValue: number | number[]) => {
+    setValue(newValue);
+  };
+
+  return (
+    <div>
+      <Typography id="non-linear-slider" gutterBottom>
+        Temperature range
+      </Typography>
+      <Slider
+        value={value}
+        min={0}
+        step={0.1}
+        max={6}
+        scale={x => x ** 10}
+        getAriaValueText={valueLabelFormat}
+        valueLabelFormat={valueLabelFormat}
+        onChange={handleChange}
+        valueLabelDisplay="auto"
+        aria-labelledby="non-linear-slider"
+      />
+    </div>
+  );
+}

docs/src/pages/components/slider/slider.md

@@ -64,6 +64,13 @@ The track can be inverted with `track="inverted"`.
 
 {{"demo": "pages/components/slider/TrackInvertedSlider.js"}}
 
+## Non-linear scale
+
+You can use the `scale` prop to represent the `value` on a different scale.
+For instance, in the following demo, the value *x* represents the power of *10^x*.
+
+{{"demo": "pages/components/slider/NonLinearSlider.js"}}
+
 ## Accessibility
 
 (WAI-ARIA: https://www.w3.org/TR/wai-aria-practices/#slider)

docs/src/pages/components/steppers/steppers.md

@@ -50,13 +50,13 @@ determine when all steps are completed (or even if they need to be completed).
 
 {{"demo": "pages/components/steppers/HorizontalNonLinearStepper.js", "bg": true}}
 
-### Non Linear - Alternative Label
+### Non-linear - Alternative Label
 
 Labels can be placed below the step icon by setting the `alternativeLabel` prop on the `Stepper` component.
 
 {{"demo": "pages/components/steppers/HorizontalNonLinearAlternativeLabelStepper.js", "bg": true}}
 
-### Non Linear - Error Step
+### Non-linear - Error Step
 
 {{"demo": "pages/components/steppers/HorizontalNonLinearStepperWithError.js", "bg": true}}
 

packages/material-ui/src/Slider/Slider.d.ts

@@ -35,6 +35,7 @@ export interface SliderProps
   onChangeCommitted?: (event: React.ChangeEvent<{}>, value: number | number[]) => void;
   orientation?: 'horizontal' | 'vertical';
   step?: number | null;
+  scale?: (value: number) => number;
   ThumbComponent?: React.ElementType<React.HTMLAttributes<HTMLSpanElement>>;
   track?: 'normal' | false | 'inverted';
   value?: number | number[];

packages/material-ui/src/Slider/Slider.js

@@ -355,6 +355,7 @@ const Slider = React.forwardRef(function Slider(props, ref) {
     onChangeCommitted,
     onMouseDown,
     orientation = 'horizontal',
+    scale = Identity,
     step = 1,
     ThumbComponent = 'span',
     track = 'normal',
@@ -742,7 +743,7 @@ const Slider = React.forwardRef(function Slider(props, ref) {
             className={classes.valueLabel}
             value={
               typeof valueLabelFormat === 'function'
-                ? valueLabelFormat(value, index)
+                ? valueLabelFormat(scale(value), index)
                 : valueLabelFormat
             }
             index={index}
@@ -762,10 +763,12 @@ const Slider = React.forwardRef(function Slider(props, ref) {
               aria-label={getAriaLabel ? getAriaLabel(index) : ariaLabel}
               aria-labelledby={ariaLabelledby}
               aria-orientation={orientation}
-              aria-valuemax={max}
-              aria-valuemin={min}
-              aria-valuenow={value}
-              aria-valuetext={getAriaValueText ? getAriaValueText(value, index) : ariaValuetext}
+              aria-valuemax={scale(max)}
+              aria-valuemin={scale(min)}
+              aria-valuenow={scale(value)}
+              aria-valuetext={
+                getAriaValueText ? getAriaValueText(scale(value), index) : ariaValuetext
+              }
               onKeyDown={handleKeyDown}
               onFocus={handleFocus}
               onBlur={handleBlur}
@@ -895,6 +898,10 @@ Slider.propTypes = {
    * The slider orientation.
    */
   orientation: PropTypes.oneOf(['horizontal', 'vertical']),
+  /**
+   * A transformation function, to change the scale of the slider.
+   */
+  scale: PropTypes.func,
   /**
    * The granularity with which the slider can step through values. (A "discrete" slider.)
    * The `min` prop serves as the origin for the valid values.