DifferentialActionMenuEventListener.php
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	<?php

	final class DifferentialActionMenuEventListener
	extends PhabricatorEventListener {

	public function register() {
	$this->listen(PhabricatorEventType::TYPE_UI_DIDRENDERACTIONS);
	}

	public function handleEvent(PhutilEvent $event) {
	switch ($event->getType()) {
	case PhabricatorEventType::TYPE_UI_DIDRENDERACTIONS:
	$this->handleActionsEvent($event);
	break;
	}
	}

	private function handleActionsEvent(PhutilEvent $event) {
	$object = $event->getValue('object');

	$actions = null;
	if ($object instanceof ManiphestTask) {
	$actions = $this->renderTaskItems($event);
	$this->addActionMenuItems($event, $actions);
	}

	}

	private function renderTaskItems(PhutilEvent $event) {
	if (!$this->canUseApplication($event->getUser())) {
	return null;
	}

	$task = $event->getValue('object');
	$phid = $task->getPHID();

	$can_edit = PhabricatorPolicyFilter::hasCapability(
	$event->getUser(),
	$task,
	PhabricatorPolicyCapability::CAN_EDIT);

	return id(new PhabricatorActionView())
	->setName(pht('Edit Differential Revisions'))
	->setHref("/search/attach/{$phid}/DREV/")
	->setIcon('fa-cog')
	->setDisabled(!$can_edit)
	->setWorkflow(true);
	}

	}