[base-ui] Create useNumberInput and NumberInput

docs/data/base/components/number-input/NumberInputBasic/css/index.js

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+import * as React from 'react';
+import NumberInput, { numberInputClasses } from '@mui/base/Unstable_NumberInput';
+import { useTheme } from '@mui/system';
+
+export default function NumberInputBasic() {
+  return (
+    <React.Fragment>
+      <NumberInput
+        slotProps={{
+          root: { className: 'CustomNumberInput' },
+          input: { className: 'input' },
+          decrementButton: { className: 'btn decrement', children: '▾' },
+          incrementButton: { className: 'btn increment', children: '▴' },
+        }}
+        aria-label="Demo number input"
+        placeholder="Type a number…"
+      />
+      <Styles />
+    </React.Fragment>
+  );
+}
+
+const cyan = {
+  50: '#E9F8FC',
+  100: '#BDEBF4',
+  200: '#99D8E5',
+  300: '#66BACC',
+  400: '#1F94AD',
+  500: '#0D5463',
+  600: '#094855',
+  700: '#063C47',
+  800: '#043039',
+  900: '#022127',
+};
+
+const grey = {
+  50: '#F3F6F9',
+  100: '#E7EBF0',
+  200: '#E0E3E7',
+  300: '#CDD2D7',
+  400: '#B2BAC2',
+  500: '#A0AAB4',
+  600: '#6F7E8C',
+  700: '#3E5060',
+  800: '#2D3843',
+  900: '#1A2027',
+};
+
+function useIsDarkMode() {
+  const theme = useTheme();
+  return theme.palette.mode === 'dark';
+}
+
+function Styles() {
+  // Replace this with your app logic for determining dark mode
+  const isDarkMode = useIsDarkMode();
+
+  return (
+    <style>
+      {`
+      .CustomNumberInput {
+        font-family: IBM Plex Sans, sans-serif;
+        font-size: 0.875rem;
+        font-weight: 400;
+        line-height: 1.5;
+        border-radius: 8px;
+        color: ${isDarkMode ? grey[300] : grey[900]};
+        background: ${isDarkMode ? grey[900] : '#fff'};
+        border: 1px solid ${isDarkMode ? grey[700] : grey[200]};
+        box-shadow: 0px 2px 2px ${isDarkMode ? grey[900] : grey[50]};
+        display: grid;
+        grid-template-columns: 1fr 19px;
+        grid-template-rows: 1fr 1fr;
+        overflow: hidden;
+      }
+
+      .CustomNumberInput:hover {
+        border-color: ${cyan[400]};
+      }
+
+      .CustomNumberInput.${numberInputClasses.focused} {
+        border-color: ${cyan[400]};
+        box-shadow: 0 0 0 3px ${isDarkMode ? cyan[500] : cyan[200]};
+      }
+
+      .CustomNumberInput .input {
+        font-family: inherit;
+        font-size: inherit;
+        font-weight: inherit;
+        line-height: inherit;
+        line-height: 1.5;
+        grid-column: 1/2;
+        grid-row: 1/3;
+        color: ${isDarkMode ? grey[300] : grey[900]};
+        background: inherit;
+        border: 0;
+        border-radius: inherit;
+        padding: 8px 12px;
+        outline: 0;
+      }
+
+      .CustomNumberInput .input:focus-visible {
+        outline: 0;
+      }
+
+      .CustomNumberInput .btn {
+        display: flex;
+        flex-flow: row nowrap;
+        justify-content: center;
+        align-items: center;
+        appearance: none;
+        padding: 0;
+        width: 19px;
+        height: 19px;
+        font-family: system-ui, sans-serif;
+        font-size: 0.875rem;
+        box-sizing: border-box;
+        line-height: 1;
+        background: ${isDarkMode ? grey[900] : '#fff'};
+        color: ${isDarkMode ? grey[300] : grey[900]};
+        border: 0;
+
+        transition-property: all;
+        transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
+        transition-duration: 120ms;
+      }
+
+      .CustomNumberInput .btn:hover {
+        background: ${isDarkMode ? grey[800] : grey[50]};
+        border-color: ${isDarkMode ? grey[600] : grey[300]};
+        cursor: pointer;
+      }
+
+      .CustomNumberInput .btn.increment {
+        grid-column: 2/3;
+        grid-row: 1/2;
+      }
+
+      .CustomNumberInput .btn.decrement {
+        grid-column: 2/3;
+        grid-row: 2/3;
+      }
+      `}
+    </style>
+  );
+}

docs/data/base/components/number-input/NumberInputBasic/css/index.tsx

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+import * as React from 'react';
+import NumberInput, { numberInputClasses } from '@mui/base/Unstable_NumberInput';
+import { useTheme } from '@mui/system';
+
+export default function NumberInputBasic() {
+  return (
+    <React.Fragment>
+      <NumberInput
+        slotProps={{
+          root: { className: 'CustomNumberInput' },
+          input: { className: 'input' },
+          decrementButton: { className: 'btn decrement', children: '▾' },
+          incrementButton: { className: 'btn increment', children: '▴' },
+        }}
+        aria-label="Demo number input"
+        placeholder="Type a number…"
+      />
+      <Styles />
+    </React.Fragment>
+  );
+}
+
+const cyan = {
+  50: '#E9F8FC',
+  100: '#BDEBF4',
+  200: '#99D8E5',
+  300: '#66BACC',
+  400: '#1F94AD',
+  500: '#0D5463',
+  600: '#094855',
+  700: '#063C47',
+  800: '#043039',
+  900: '#022127',
+};
+
+const grey = {
+  50: '#F3F6F9',
+  100: '#E7EBF0',
+  200: '#E0E3E7',
+  300: '#CDD2D7',
+  400: '#B2BAC2',
+  500: '#A0AAB4',
+  600: '#6F7E8C',
+  700: '#3E5060',
+  800: '#2D3843',
+  900: '#1A2027',
+};
+
+function useIsDarkMode() {
+  const theme = useTheme();
+  return theme.palette.mode === 'dark';
+}
+
+function Styles() {
+  // Replace this with your app logic for determining dark mode
+  const isDarkMode = useIsDarkMode();
+
+  return (
+    <style>
+      {`
+      .CustomNumberInput {
+        font-family: IBM Plex Sans, sans-serif;
+        font-size: 0.875rem;
+        font-weight: 400;
+        line-height: 1.5;
+        border-radius: 8px;
+        color: ${isDarkMode ? grey[300] : grey[900]};
+        background: ${isDarkMode ? grey[900] : '#fff'};
+        border: 1px solid ${isDarkMode ? grey[700] : grey[200]};
+        box-shadow: 0px 2px 2px ${isDarkMode ? grey[900] : grey[50]};
+        display: grid;
+        grid-template-columns: 1fr 19px;
+        grid-template-rows: 1fr 1fr;
+        overflow: hidden;
+      }
+
+      .CustomNumberInput:hover {
+        border-color: ${cyan[400]};
+      }
+
+      .CustomNumberInput.${numberInputClasses.focused} {
+        border-color: ${cyan[400]};
+        box-shadow: 0 0 0 3px ${isDarkMode ? cyan[500] : cyan[200]};
+      }
+
+      .CustomNumberInput .input {
+        font-family: inherit;
+        font-size: inherit;
+        font-weight: inherit;
+        line-height: inherit;
+        line-height: 1.5;
+        grid-column: 1/2;
+        grid-row: 1/3;
+        color: ${isDarkMode ? grey[300] : grey[900]};
+        background: inherit;
+        border: 0;
+        border-radius: inherit;
+        padding: 8px 12px;
+        outline: 0;
+      }
+
+      .CustomNumberInput .input:focus-visible {
+        outline: 0;
+      }
+
+      .CustomNumberInput .btn {
+        display: flex;
+        flex-flow: row nowrap;
+        justify-content: center;
+        align-items: center;
+        appearance: none;
+        padding: 0;
+        width: 19px;
+        height: 19px;
+        font-family: system-ui, sans-serif;
+        font-size: 0.875rem;
+        box-sizing: border-box;
+        line-height: 1;
+        background: ${isDarkMode ? grey[900] : '#fff'};
+        color: ${isDarkMode ? grey[300] : grey[900]};
+        border: 0;
+
+        transition-property: all;
+        transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
+        transition-duration: 120ms;
+      }
+
+      .CustomNumberInput .btn:hover {
+        background: ${isDarkMode ? grey[800] : grey[50]};
+        border-color: ${isDarkMode ? grey[600] : grey[300]};
+        cursor: pointer;
+      }
+
+      .CustomNumberInput .btn.increment {
+        grid-column: 2/3;
+        grid-row: 1/2;
+      }
+
+      .CustomNumberInput .btn.decrement {
+        grid-column: 2/3;
+        grid-row: 2/3;
+      }
+      `}
+    </style>
+  );
+}

docs/data/base/components/number-input/NumberInputBasic/css/index.tsx.preview

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+<React.Fragment>
+  <NumberInput
+    slotProps={{
+      root: { className: 'CustomNumberInput' },
+      input: { className: 'input' },
+      decrementButton: { className: 'btn decrement', children: '▾' },
+      incrementButton: { className: 'btn increment', children: '▴' },
+    }}
+    aria-label="Demo number input"
+    placeholder="Type a number…"
+  />
+  <Styles />
+</React.Fragment>