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 王天杨
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import { createContext, ReactNode, useContext } from 'react';
import { addMonths, isBefore, isSameMonth } from 'date-fns';
import { useDayPicker } from '../DayPicker';
import { useNavigationState } from './useNavigationState';
import { getDisplayMonths } from './utils/getDisplayMonths';
import { getNextMonth } from './utils/getNextMonth';
import { getPreviousMonth } from './utils/getPreviousMonth';
/** Represents the value of the {@link NavigationContext}. */
export interface NavigationContextValue {
/** The month to display in the calendar. When `numberOfMonths` is greater than one, is the first of the displayed months. */
currentMonth: Date;
/** The months rendered by DayPicker. DayPicker can render multiple months via `numberOfMonths`. */
displayMonths: Date[];
/** Navigate to the specified month. */
goToMonth: (month: Date) => void;
/** Navigate to the specified date. */
goToDate: (date: Date, refDate?: Date) => void;
/** The next month to display. */
nextMonth?: Date;
/** The previous month to display. */
previousMonth?: Date;
/** Whether the given day is included in the displayed months. */
isDateDisplayed: (day: Date) => boolean;
}
/**
* The Navigation context shares details and methods to navigate the months in DayPicker.
* Access this context from the {@link useNavigation} hook.
*/
export const NavigationContext = createContext<
NavigationContextValue | undefined
>(undefined);
/** Provides the values for the {@link NavigationContext}. */
export function NavigationProvider(props: {
children?: ReactNode;
}): JSX.Element {
const dayPicker = useDayPicker();
const [currentMonth, goToMonth] = useNavigationState();
const displayMonths = getDisplayMonths(currentMonth, dayPicker);
const nextMonth = getNextMonth(currentMonth, dayPicker);
const previousMonth = getPreviousMonth(currentMonth, dayPicker);
const isDateDisplayed = (date: Date) => {
return displayMonths.some((displayMonth) =>
isSameMonth(date, displayMonth)
);
};
const goToDate = (date: Date, refDate?: Date) => {
if (isDateDisplayed(date)) {
return;
}
if (refDate && isBefore(date, refDate)) {
goToMonth(addMonths(date, 1 + dayPicker.numberOfMonths * -1));
} else {
goToMonth(date);
}
};
const value: NavigationContextValue = {
currentMonth,
displayMonths,
goToMonth,
goToDate,
previousMonth,
nextMonth,
isDateDisplayed
};
return (
<NavigationContext.Provider value={value}>
{props.children}
</NavigationContext.Provider>
);
}
/**
* Hook to access the {@link NavigationContextValue}. Use this hook to navigate
* between months or years in DayPicker.
*
* This hook is meant to be used inside internal or custom components.
*/
export function useNavigation(): NavigationContextValue {
const context = useContext(NavigationContext);
if (!context) {
throw new Error('useNavigation must be used within a NavigationProvider');
}
return context;
}
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