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PhabricatorCalendarEventDragController.php
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			<?php

			final class PhabricatorCalendarEventDragController
			extends PhabricatorCalendarController {

			public function handleRequest(AphrontRequest $request) {
			$viewer = $request->getViewer();

			$event = id(new PhabricatorCalendarEventQuery())
			->setViewer($viewer)
			->withIDs(array($request->getURIData('id')))
			->requireCapabilities(
			array(
			PhabricatorPolicyCapability::CAN_VIEW,
			PhabricatorPolicyCapability::CAN_EDIT,
			))
			->executeOne();
			if (!$event) {
			return new Aphront404Response();
			}

			if (!$request->validateCSRF()) {
			return new Aphront400Response();
			}

			if ($event->getIsAllDay()) {
			return new Aphront400Response();
			}

			$xactions = array();

			$duration = $event->getDuration();

			$start = $request->getInt('start');
			$start_value = id(AphrontFormDateControlValue::newFromEpoch(
			$viewer,
			$start));

			$end = $start + $duration;
			$end_value = id(AphrontFormDateControlValue::newFromEpoch(
			$viewer,
			$end));

			$xactions[] = id(new PhabricatorCalendarEventTransaction())
			->setTransactionType(
			PhabricatorCalendarEventStartDateTransaction::TRANSACTIONTYPE)
			->setNewValue($start_value);

			$xactions[] = id(new PhabricatorCalendarEventTransaction())
			->setTransactionType(
			PhabricatorCalendarEventEndDateTransaction::TRANSACTIONTYPE)
			->setNewValue($end_value);

			$editor = id(new PhabricatorCalendarEventEditor())
			->setActor($viewer)
			->setContinueOnMissingFields(true)
			->setContentSourceFromRequest($request)
			->setContinueOnNoEffect(true);

			$xactions = $editor->applyTransactions($event, $xactions);

			return id(new AphrontReloadResponse());
			}
			}