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import { invariant } from '@react-dnd/invariant'; import { addSource, addTarget, removeSource, removeTarget, } from './actions/registry'; import { getNextUniqueId } from './utils/getNextUniqueId'; import { HandlerRole, } from './interfaces'; import { validateSourceContract, validateTargetContract, validateType, } from './contracts'; import { asap } from '@react-dnd/asap'; function getNextHandlerId(role) { const id = getNextUniqueId().toString(); switch (role) { case HandlerRole.SOURCE: return `S${id}`; case HandlerRole.TARGET: return `T${id}`; default: throw new Error(`Unknown Handler Role: ${role}`); } } function parseRoleFromHandlerId(handlerId) { switch (handlerId[0]) { case 'S': return HandlerRole.SOURCE; case 'T': return HandlerRole.TARGET; default: invariant(false, `Cannot parse handler ID: ${handlerId}`); } } function mapContainsValue(map, searchValue) { const entries = map.entries(); let isDone = false; do { const { done, value: [, value], } = entries.next(); if (value === searchValue) { return true; } isDone = !!done; } while (!isDone); return false; } export class HandlerRegistryImpl { constructor(store) { this.types = new Map(); this.dragSources = new Map(); this.dropTargets = new Map(); this.pinnedSourceId = null; this.pinnedSource = null; this.store = store; } addSource(type, source) { validateType(type); validateSourceContract(source); const sourceId = this.addHandler(HandlerRole.SOURCE, type, source); this.store.dispatch(addSource(sourceId)); return sourceId; } addTarget(type, target) { validateType(type, true); validateTargetContract(target); const targetId = this.addHandler(HandlerRole.TARGET, type, target); this.store.dispatch(addTarget(targetId)); return targetId; } containsHandler(handler) { return (mapContainsValue(this.dragSources, handler) \|\| mapContainsValue(this.dropTargets, handler)); } getSource(sourceId, includePinned = false) { invariant(this.isSourceId(sourceId), 'Expected a valid source ID.'); const isPinned = includePinned && sourceId === this.pinnedSourceId; const source = isPinned ? this.pinnedSource : this.dragSources.get(sourceId); return source; } getTarget(targetId) { invariant(this.isTargetId(targetId), 'Expected a valid target ID.'); return this.dropTargets.get(targetId); } getSourceType(sourceId) { invariant(this.isSourceId(sourceId), 'Expected a valid source ID.'); return this.types.get(sourceId); } getTargetType(targetId) { invariant(this.isTargetId(targetId), 'Expected a valid target ID.'); return this.types.get(targetId); } isSourceId(handlerId) { const role = parseRoleFromHandlerId(handlerId); return role === HandlerRole.SOURCE; } isTargetId(handlerId) { const role = parseRoleFromHandlerId(handlerId); return role === HandlerRole.TARGET; } removeSource(sourceId) { invariant(this.getSource(sourceId), 'Expected an existing source.'); this.store.dispatch(removeSource(sourceId)); asap(() => { this.dragSources.delete(sourceId); this.types.delete(sourceId); }); } removeTarget(targetId) { invariant(this.getTarget(targetId), 'Expected an existing target.'); this.store.dispatch(removeTarget(targetId)); this.dropTargets.delete(targetId); this.types.delete(targetId); } pinSource(sourceId) { const source = this.getSource(sourceId); invariant(source, 'Expected an existing source.'); this.pinnedSourceId = sourceId; this.pinnedSource = source; } unpinSource() { invariant(this.pinnedSource, 'No source is pinned at the time.'); this.pinnedSourceId = null; this.pinnedSource = null; } addHandler(role, type, handler) { const id = getNextHandlerId(role); this.types.set(id, type); if (role === HandlerRole.SOURCE) { this.dragSources.set(id, handler); } else if (role === HandlerRole.TARGET) { this.dropTargets.set(id, handler); } return id; } }

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