62 lines
1.4 KiB
JavaScript
62 lines
1.4 KiB
JavaScript
/**
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* External dependencies
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*/
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import { uniqueId } from 'lodash';
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export const TYPES = {
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ADD_EVENT_CALLBACK: 'add_event_callback',
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REMOVE_EVENT_CALLBACK: 'remove_event_callback',
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};
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export const actions = {
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addEventCallback: ( eventType, callback, priority = 10 ) => {
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return {
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id: uniqueId(),
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type: TYPES.ADD_EVENT_CALLBACK,
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eventType,
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callback,
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priority,
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};
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},
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removeEventCallback: ( eventType, id ) => {
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return {
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id,
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type: TYPES.REMOVE_EVENT_CALLBACK,
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eventType,
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};
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},
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};
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/**
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* Handles actions for emmitters
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*
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* @param {Object} state Current state.
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* @param {Object} action Incoming action object
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* @param {string} action.type The type of action.
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* @param {string} action.eventType What type of event is emitted.
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* @param {string} action.id The id for the event.
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* @param {function(any):any} action.callback The registered callback for the event.
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* @param {number} action.priority The priority for the event.
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*/
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export const reducer = (
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state = {},
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{ type, eventType, id, callback, priority }
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) => {
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const newEvents = new Map( state[ eventType ] );
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switch ( type ) {
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case TYPES.ADD_EVENT_CALLBACK:
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newEvents.set( id, { priority, callback } );
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return {
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...state,
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[ eventType ]: newEvents,
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};
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case TYPES.REMOVE_EVENT_CALLBACK:
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newEvents.delete( id );
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return {
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...state,
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[ eventType ]: newEvents,
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};
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}
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return state;
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};
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