Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import {Flex, Text} from '@gravity-ui/uikit';
import {block} from '../../../utils/cn';
import type {WheelProps, WheelValue} from '../TimeSelection.types';
import './Wheel.scss';
const b = block('time-selection-wheel');
export const Wheel = ({
values,
value,
setValue,
isActive,
onActivate,
onChange,
disabled = false,
}: WheelProps) => {
const containerRef = React.useRef<HTMLDivElement>(null);
const selectedRef = React.useRef<HTMLDivElement>(null);
const [currentIndex, setCurrentIndex] = React.useState(() =>
Math.max(
values.findIndex((v) => v.value === value),
0,
),
);
React.useEffect(() => {
const newIndex = values.findIndex((v) => v.value === value);
Iif (newIndex !== -1 && newIndex !== currentIndex) {
setCurrentIndex(newIndex);
}
if (selectedRef.current && containerRef.current) {
const container = containerRef.current;
const selected = selectedRef.current;
const containerHeight = container.clientHeight;
const selectedHeight = selected.clientHeight;
const selectedTop = selected.offsetTop;
const scrollTop = selectedTop - containerHeight / 2 + selectedHeight / 2;
container.scrollTo({
top: scrollTop,
behavior: 'smooth',
});
}
}, [value, values, currentIndex]);
React.useEffect(() => {
if (selectedRef.current && containerRef.current) {
const container = containerRef.current;
const selected = selectedRef.current;
const containerHeight = container.clientHeight;
const selectedHeight = selected.clientHeight;
const selectedTop = selected.offsetTop;
const scrollTop = selectedTop - containerHeight / 2 + selectedHeight / 2;
container.scrollTo({
top: scrollTop,
behavior: 'instant' as ScrollBehavior,
});
}
}, []);
const isItemDisabled = (val: WheelValue): boolean => !!val.disabled || disabled;
const handleClick = (val: WheelValue, idx: number) => {
if (isItemDisabled(val)) return;
setCurrentIndex(idx);
setValue(val.value);
onChange?.(val.value);
onActivate?.();
};
const findNextEnabledIndex = (startIndex: number, direction: 1 | -1): number => {
let newIndex = startIndex;
let attempts = 0;
while (isItemDisabled(values[newIndex]) && attempts < values.length) {
newIndex =
direction === 1
? (newIndex + 1) % values.length
: (newIndex - 1 + values.length) % values.length;
attempts++;
}
return isItemDisabled(values[newIndex]) ? startIndex : newIndex;
};
const handleKeyDown = (e: React.KeyboardEvent<HTMLDivElement>) => {
if (disabled || !isActive) return;
let newIndex = currentIndex;
switch (e.key) {
case 'ArrowUp':
e.preventDefault();
newIndex = findNextEnabledIndex(
currentIndex > 0 ? currentIndex - 1 : values.length - 1,
-1,
);
break;
case 'ArrowDown':
e.preventDefault();
newIndex = findNextEnabledIndex(
currentIndex < values.length - 1 ? currentIndex + 1 : 0,
1,
);
break;
case 'Home':
e.preventDefault();
newIndex = findNextEnabledIndex(0, 1);
break;
case 'End':
e.preventDefault();
newIndex = findNextEnabledIndex(values.length - 1, -1);
break;
default:
return;
}
if (newIndex !== currentIndex) {
handleClick(values[newIndex], newIndex);
}
};
return (
<div
className={b({active: isActive, disabled})}
role="listbox"
tabIndex={disabled ? -1 : 0}
aria-activedescendant={value}
aria-label="time-section"
ref={containerRef}
onClick={onActivate}
onKeyDown={handleKeyDown}
>
<Flex direction="column">
{values.map((val, i) => {
const selected = val.value === value;
const itemDisabled = isItemDisabled(val);
return (
<Flex
justifyContent="center"
alignItems="center"
id={val.value}
role="option"
aria-selected={selected}
aria-disabled={itemDisabled}
className={b('cell', {selected, disabled: itemDisabled})}
key={val.value}
ref={selected ? selectedRef : null}
onClick={() => handleClick(val, i)}
>
<Text variant="body-1">{val.label}</Text>
</Flex>
);
})}
</Flex>
<div className={b('highlight')} />
</div>
);
};
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