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createContext,
useContext,
useEffect,
useMemo,
useRef
} from 'react';
import type {
MomentProviderProps,
MomentSettings,
PoolEntry
} from './types';
/**
* Controls registration of mounted `<Moment>` instances with a pooled timer.
*/
export interface PoolController {
add: (entry: PoolEntry) => void;
remove: (entry: PoolEntry) => void;
}
/**
* Value exposed by `MomentContext`.
*/
export interface MomentContextValue {
settings: MomentSettings;
pool: PoolController | null;
}
/**
* Built-in defaults used when no `<MomentProvider>` is mounted.
*/
export const defaultSettings: MomentSettings = {
moment: null,
locale: null,
local: null,
format: null,
parse: null,
filters: null,
renderers: null,
element: 'time',
timezone: null
};
const defaultContextValue: MomentContextValue = {
settings: defaultSettings,
pool: null
};
export const MomentContext = createContext<MomentContextValue>(defaultContextValue);
/**
* Returns the nearest `MomentContext` value.
*/
export function useMomentContext(): MomentContextValue {
return useContext(MomentContext);
}
const settingKeys: (keyof MomentSettings)[] = [
'moment',
'locale',
'local',
'format',
'parse',
'filters',
'renderers',
'element',
'timezone'
];
type MomentSettingsInput = Partial<Omit<MomentProviderProps, 'children' | 'pool' | 'interval'>>;
/**
* Shallow-merges provider props onto parent settings.
*/
function mergeSettings(
parent: MomentSettings,
props: MomentSettingsInput
): MomentSettings {
const merged = { ...parent };
for (const key of settingKeys) {
if (key in props && props[key] !== undefined) {
(merged as Record<string, unknown>)[key] = props[key];
}
}
return merged;
}
/**
* Supplies default settings and optional pooled timing to descendant `<Moment>` instances.
*/
export function MomentProvider({
children,
pool: enablePool,
interval = 60000,
moment: momentProp,
locale,
local,
format,
parse,
filters,
renderers,
element,
timezone
}: MomentProviderProps): React.ReactElement {
const parent = useMomentContext();
const entriesRef = useRef<Set<PoolEntry>>(new Set());
const settings = useMemo(
() => mergeSettings(parent.settings, {
moment: momentProp,
locale,
local,
format,
parse,
filters,
renderers,
element,
timezone
}),
[
parent.settings,
momentProp,
locale,
local,
format,
parse,
filters,
renderers,
element,
timezone
]
);
const pool = useMemo<PoolController | null>(() => {
if (!enablePool) {
return null;
}
return {
add: (entry: PoolEntry) => {
entriesRef.current.add(entry);
},
remove: (entry: PoolEntry) => {
entriesRef.current.delete(entry);
}
};
}, [enablePool]);
useEffect(() => {
if (!enablePool) {
return undefined;
}
const timer = setInterval(() => {
entriesRef.current.forEach((entry) => {
if (entry.getProps().interval !== 0) {
entry.update();
}
});
}, interval);
return () => {
clearInterval(timer);
entriesRef.current.clear();
};
}, [enablePool, interval]);
const value = useMemo(
() => ({ settings, pool }),
[settings, pool]
);
return (
<MomentContext.Provider value={value}>
{children}
</MomentContext.Provider>
);
}
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