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import type {DateTime} from '@gravity-ui/date-utils';
import {useControlledState} from '@gravity-ui/uikit';
import type {RangeValue, ValueBase} from '../../types';
import {SECOND, YEAR} from '../../utils/constants';
import {constrainValue, createPlaceholderValue} from '../../utils/dates';
import {useDefaultTimeZone} from '../../utils/useDefaultTimeZone';
import {alignDateTime} from '../utils/date';
function getViewportIntervalFromDates(
start: DateTime,
end: DateTime,
numberOfIntervals = 4,
placeInViewport = 0.5,
) {
const diff = end.diff(start);
return {
start: start.subtract(diff * (numberOfIntervals - 1) * placeInViewport),
end: end.add(diff * (numberOfIntervals - 1) * (1 - placeInViewport)),
};
}
export interface RangeDateSelectionState {
viewportInterval: RangeValue<DateTime>;
value: RangeValue<DateTime>;
setValue: (value: RangeValue<DateTime>) => void;
timeZone: string;
setDraggingValue: (value: RangeValue<DateTime> | null) => void;
canResize: boolean;
startDragging: () => void;
move: (delta: number, options?: {visualMinDuration?: number}) => void;
scale: (scale: number, options?: {visualMinDuration?: number; fixedPoint?: number}) => void;
moveStart: (delta: number, options?: {visualMinDuration?: number}) => void;
moveEnd: (delta: number, options?: {visualMinDuration?: number}) => void;
endDragging: () => void;
align: number;
isDragging: boolean;
}
export interface RangeDateSelectionOptions extends ValueBase<RangeValue<DateTime>> {
/** The minimum allowed date that a user may select. */
minValue?: DateTime;
/** The maximum allowed date that a user may select. */
maxValue?: DateTime;
/** Minimum duration of the selection in milliseconds. Defaults to 1 second. */
minDuration?: number;
/** Maximum duration of the selection in milliseconds. Defaults to 15 years. */
maxDuration?: number;
/** Alignment of the selection in milliseconds. Defaults to 1 second. */
align?: number;
/** A placeholder date that controls the default values of each segment when the user first interacts with them. Defaults to today's date at midnight. */
placeholderValue?: DateTime;
/**
* Which timezone use to show values. Example: 'default', 'system', 'Europe/Amsterdam'.
* @default The timezone of the `value` or `defaultValue` or `placeholderValue`, 'default' otherwise.
*/
timeZone?: string;
/**
* The number of selection intervals that fit into the underlying ruler.
* @default 4
*/
numberOfIntervals?: number;
/**
* Place of the selection on the underlying ruler.
* Value must be between 0 and 1, where 0 is the start of the ruler and 1 is the end.
* @default 0.5 - center of the ruler
*/
placeOnRuler?: number;
}
export function useRangeDateSelectionState(
props: RangeDateSelectionOptions,
): RangeDateSelectionState {
const inputTimeZone = useDefaultTimeZone(
props.value?.start || props.defaultValue?.start || props.placeholderValue,
);
const timeZone = props.timeZone || inputTimeZone;
const placeholderValue = createPlaceholderValue({
placeholderValue: props.placeholderValue,
timeZone,
});
const [isDragging, setIsDragging] = React.useState(false);
const [currentValue, setCurrentValue] = React.useState<RangeValue<DateTime> | null>(null);
const [value, setValue] = useControlledState(
props.value,
props.defaultValue ?? {
start: placeholderValue.startOf('day').timeZone(inputTimeZone),
end: placeholderValue.endOf('day').timeZone(inputTimeZone),
},
props.onUpdate,
);
const setInterval = (newValue: RangeValue<DateTime>) => {
setCurrentValue(null);
setValue({
start: alignDateTime(newValue.start, props.align).timeZone(inputTimeZone),
end: alignDateTime(newValue.end, props.align).timeZone(inputTimeZone),
});
};
const displayValue = {
start: value.start.timeZone(timeZone),
end: value.end.timeZone(timeZone),
};
const interval = isDragging ? displayValue : (currentValue ?? displayValue);
const viewportInterval = getViewportIntervalFromDates(
interval.start,
interval.end,
props.numberOfIntervals,
props.placeOnRuler,
);
const minValue = props.minValue?.isAfter(viewportInterval.start)
? props.minValue
: viewportInterval.start;
const maxValue = props.maxValue?.isBefore(viewportInterval.end)
? props.maxValue
: viewportInterval.end;
const align = props.align ?? SECOND;
const minDuration = Math.max(props.minDuration ?? SECOND, align);
const maxDuration = Math.max(
Math.min(props.maxDuration ?? 15 * YEAR, maxValue.diff(minValue)),
minDuration,
);
const canResize = minDuration < maxDuration;
const draggingState = React.useRef<RangeValue<DateTime> | null>(null);
const setDraggingValue = (v: RangeValue<DateTime> | null) => {
draggingState.current = v;
setCurrentValue(v);
};
const startDragging = () => {
setIsDragging(true);
setDraggingValue(displayValue);
};
const endDragging = () => {
setIsDragging(false);
if (draggingState.current) {
setInterval(draggingState.current);
}
};
const moveInterval = (delta: number) => {
if (!draggingState.current) {
return;
}
const {start, end} = draggingState.current;
let newStart = start.add(delta, 'millisecond');
let newEnd = end.add(delta, 'millisecond');
const diff = newEnd.diff(newStart);
if (newStart.valueOf() < minValue.valueOf()) {
newStart = minValue;
newEnd = constrainValue(newStart.add(diff, 'millisecond'), newStart, maxValue);
} else if (newEnd.valueOf() > maxValue.valueOf()) {
newEnd = maxValue;
newStart = constrainValue(newEnd.subtract(diff, 'millisecond'), minValue, newEnd);
}
setDraggingValue({start: newStart, end: newEnd});
};
const moveStart = (
delta: number,
{visualMinDuration = minDuration}: {visualMinDuration?: number} = {},
) => {
if (!draggingState.current) {
return;
}
const {start, end} = draggingState.current;
let newStart = start.add(delta, 'millisecond');
const deltaMin = Math.max(visualMinDuration, minDuration);
const deltaMax = Math.min(maxDuration, end.diff(minValue));
newStart = constrainValue(
newStart,
end.subtract(deltaMax, 'millisecond'),
end.subtract(deltaMin, 'millisecond'),
);
setDraggingValue({start: newStart, end});
};
const moveEnd = (
delta: number,
{visualMinDuration = minDuration}: {visualMinDuration?: number} = {},
) => {
if (!draggingState.current) {
return;
}
const {start, end} = draggingState.current;
let newEnd = end.add(delta, 'millisecond');
const deltaMin = Math.max(visualMinDuration, minDuration);
const deltaMax = Math.min(maxDuration, maxValue.diff(start));
newEnd = constrainValue(
end.add(delta, 'millisecond'),
start.add(deltaMin, 'millisecond'),
start.add(deltaMax, 'millisecond'),
);
setDraggingValue({start, end: newEnd});
};
const zoomInterval = (
scale: number,
{
visualMinDuration = minDuration,
fixedPoint = 0.5,
}: {visualMinDuration?: number; fixedPoint?: number} = {},
) => {
if (!draggingState.current) {
return;
}
const {start, end} = draggingState.current;
const len = end.diff(start);
let newDiff = len * scale;
newDiff = align * Math.round(newDiff / align);
newDiff = Math.min(
Math.max(newDiff, Math.max(visualMinDuration, minDuration)),
maxDuration,
);
let newStart = start.subtract(fixedPoint * (newDiff - len));
let newEnd = newStart.add(newDiff, 'millisecond');
const diff = newEnd.diff(newStart);
if (newStart.valueOf() < minValue.valueOf()) {
newStart = minValue;
newEnd = constrainValue(newStart.add(diff, 'millisecond'), newStart, maxValue);
} else if (newEnd.valueOf() > maxValue.valueOf()) {
newEnd = maxValue;
newStart = constrainValue(newEnd.subtract(diff, 'millisecond'), minValue, newEnd);
}
setDraggingValue({start: newStart, end: newEnd});
};
return {
viewportInterval,
value: currentValue ?? displayValue,
setValue: setInterval,
setDraggingValue,
canResize,
startDragging,
move: moveInterval,
scale: zoomInterval,
moveStart,
moveEnd,
endDragging,
timeZone,
align,
isDragging,
};
}
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