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import { invariant } from '@react-dnd/invariant';
import { isPlainObject } from '../utils/js_utils';
import { getDecoratedComponent } from './utils';
const ALLOWED_SPEC_METHODS = ['canDrag', 'beginDrag', 'isDragging', 'endDrag'];
const REQUIRED_SPEC_METHODS = ['beginDrag'];
class SourceImpl {
constructor(spec, monitor, ref) {
this.props = null;
this.beginDrag = () => {
if (!this.props) {
return;
}
const item = this.spec.beginDrag(this.props, this.monitor, this.ref.current);
if (process.env.NODE_ENV !== 'production') {
invariant(isPlainObject(item), 'beginDrag() must return a plain object that represents the dragged item. ' +
'Instead received %s. ' +
'Read more: http://react-dnd.github.io/react-dnd/docs/api/drag-source', item);
}
return item;
};
this.spec = spec;
this.monitor = monitor;
this.ref = ref;
}
receiveProps(props) {
this.props = props;
}
canDrag() {
if (!this.props) {
return false;
}
if (!this.spec.canDrag) {
return true;
}
return this.spec.canDrag(this.props, this.monitor);
}
isDragging(globalMonitor, sourceId) {
if (!this.props) {
return false;
}
if (!this.spec.isDragging) {
return sourceId === globalMonitor.getSourceId();
}
return this.spec.isDragging(this.props, this.monitor);
}
endDrag() {
if (!this.props) {
return;
}
if (!this.spec.endDrag) {
return;
}
this.spec.endDrag(this.props, this.monitor, getDecoratedComponent(this.ref));
}
}
export function createSourceFactory(spec) {
Object.keys(spec).forEach((key) => {
invariant(ALLOWED_SPEC_METHODS.indexOf(key) > -1, 'Expected the drag source 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/drag-source', ALLOWED_SPEC_METHODS.join(', '), key);
invariant(typeof spec[key] === 'function', 'Expected %s in the drag source specification to be a function. ' +
'Instead received a specification with %s: %s. ' +
'Read more: http://react-dnd.github.io/react-dnd/docs/api/drag-source', key, key, spec[key]);
});
REQUIRED_SPEC_METHODS.forEach((key) => {
invariant(typeof spec[key] === 'function', 'Expected %s in the drag source specification to be a function. ' +
'Instead received a specification with %s: %s. ' +
'Read more: http://react-dnd.github.io/react-dnd/docs/api/drag-source', key, key, spec[key]);
});
return function createSource(monitor, ref) {
return new SourceImpl(spec, monitor, ref);
};
}