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import { invariant } from '@react-dnd/invariant'; import { isPlainObject } from '../utils/js_utils'; import { getDecoratedComponent } from './utils'; const ALLOWED_SPEC_METHODS = ['canDrop', 'hover', 'drop']; class TargetImpl { constructor(spec, monitor, ref) { this.props = null; this.spec = spec; this.monitor = monitor; this.ref = ref; } receiveProps(props) { this.props = props; } receiveMonitor(monitor) { this.monitor = monitor; } canDrop() { if (!this.spec.canDrop) { return true; } return this.spec.canDrop(this.props, this.monitor); } hover() { if (!this.spec.hover) { return; } this.spec.hover(this.props, this.monitor, getDecoratedComponent(this.ref)); } drop() { if (!this.spec.drop) { return undefined; } const dropResult = this.spec.drop(this.props, this.monitor, this.ref.current); if (process.env.NODE_ENV !== 'production') { invariant(typeof dropResult === 'undefined' || isPlainObject(dropResult), 'drop() must either return undefined, or an object that represents the drop result. ' + 'Instead received %s. ' + 'Read more: http://react-dnd.github.io/react-dnd/docs/api/drop-target', dropResult); } return dropResult; } } export default function createTargetFactory(spec) { Object.keys(spec).forEach(key => { invariant(ALLOWED_SPEC_METHODS.indexOf(key) > -1, 'Expected the drop target specification to only have ' + 'some of the following keys: %s. ' + 'Instead received a specification with an unexpected "%s" key. ' + 'Read more: http://react-dnd.github.io/react-dnd/docs/api/drop-target', ALLOWED_SPEC_METHODS.join(', '), key); invariant(typeof spec[key] === 'function', 'Expected %s in the drop target specification to be a function. ' + 'Instead received a specification with %s: %s. ' + 'Read more: http://react-dnd.github.io/react-dnd/docs/api/drop-target', key, key, spec[key]); }); return function createTarget(monitor, ref) { return new TargetImpl(spec, monitor, ref); }; }
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