woocommerce/packages/woocommerce-blocks/assets/js/base/context/hooks/use-query-state.js
2021-12-10 12:03:04 +00:00

150 lines
5.5 KiB
JavaScript

/**
* External dependencies
*/
import { QUERY_STATE_STORE_KEY as storeKey } from '@woocommerce/block-data';
import { useSelect, useDispatch } from '@wordpress/data';
import { useRef, useEffect, useCallback } from '@wordpress/element';
import isShallowEqual from '@wordpress/is-shallow-equal';
import { useShallowEqual, usePrevious } from '@woocommerce/base-hooks';
/**
* Internal dependencies
*/
import { useQueryStateContext } from '../providers/query-state-context';
/**
* A custom hook that exposes the current query state and a setter for the query
* state store for the given context.
*
* "Query State" is a wp.data store that keeps track of an arbitrary object of
* query keys and their values.
*
* @param {string} [context] What context to retrieve the query state for. If not
* provided, this hook will attempt to get the context
* from the query state context provided by the
* QueryStateContextProvider
*
* @return {Array} An array that has two elements. The first element is the
* query state value for the given context. The second element
* is a dispatcher function for setting the query state.
*/
export const useQueryStateByContext = ( context ) => {
const queryStateContext = useQueryStateContext();
context = context || queryStateContext;
const queryState = useSelect(
( select ) => {
const store = select( storeKey );
return store.getValueForQueryContext( context, undefined );
},
[ context ]
);
const { setValueForQueryContext } = useDispatch( storeKey );
const setQueryState = useCallback(
( value ) => {
setValueForQueryContext( context, value );
},
[ context, setValueForQueryContext ]
);
return [ queryState, setQueryState ];
};
/**
* A custom hook that exposes the current query state value and a setter for the
* given context and query key.
*
* "Query State" is a wp.data store that keeps track of an arbitrary object of
* query keys and their values.
*
* @param {*} queryKey The specific query key to retrieve the value for.
* @param {*} [defaultValue] Default value if query does not exist.
* @param {string} [context] What context to retrieve the query state for. If
* not provided will attempt to use what is provided
* by query state context.
*
* @return {*} Whatever value is set at the query state index using the
* provided context and query key.
*/
export const useQueryStateByKey = ( queryKey, defaultValue, context ) => {
const queryStateContext = useQueryStateContext();
context = context || queryStateContext;
const queryValue = useSelect(
( select ) => {
const store = select( storeKey );
return store.getValueForQueryKey( context, queryKey, defaultValue );
},
[ context, queryKey ]
);
const { setQueryValue } = useDispatch( storeKey );
const setQueryValueByKey = useCallback(
( value ) => {
setQueryValue( context, queryKey, value );
},
[ context, queryKey, setQueryValue ]
);
return [ queryValue, setQueryValueByKey ];
};
/**
* A custom hook that works similarly to useQueryStateByContext. However, this
* hook allows for synchronizing with a provided queryState object.
*
* This hook does the following things with the provided `synchronizedQuery`
* object:
*
* - whenever synchronizedQuery varies between renders, the queryState will be
* updated to a merged object of the internal queryState and the provided
* object. Note, any values from the same properties between objects will
* be set from synchronizedQuery.
* - if there are no changes between renders, then the existing internal
* queryState is always returned.
* - on initial render, the synchronizedQuery value is returned.
*
* Typically, this hook would be used in a scenario where there may be external
* triggers for updating the query state (i.e. initial population of query
* state by hydration or component attributes, or routing url changes that
* affect query state).
*
* @param {Object} synchronizedQuery A provided query state object to
* synchronize internal query state with.
* @param {string} [context] What context to retrieve the query state
* for. If not provided, will be pulled from
* the QueryStateContextProvider in the tree.
*/
export const useSynchronizedQueryState = ( synchronizedQuery, context ) => {
const queryStateContext = useQueryStateContext();
context = context || queryStateContext;
const [ queryState, setQueryState ] = useQueryStateByContext( context );
const currentQueryState = useShallowEqual( queryState );
const currentSynchronizedQuery = useShallowEqual( synchronizedQuery );
const previousSynchronizedQuery = usePrevious( currentSynchronizedQuery );
// used to ensure we allow initial synchronization to occur before
// returning non-synced state.
const isInitialized = useRef( false );
// update queryState anytime incoming synchronizedQuery changes
useEffect( () => {
if (
! isShallowEqual(
previousSynchronizedQuery,
currentSynchronizedQuery
)
) {
setQueryState(
Object.assign( {}, currentQueryState, currentSynchronizedQuery )
);
isInitialized.current = true;
}
}, [
currentQueryState,
currentSynchronizedQuery,
previousSynchronizedQuery,
setQueryState,
] );
return isInitialized.current
? [ queryState, setQueryState ]
: [ synchronizedQuery, setQueryState ];
};