PhabricatorFlagsUIEventListener.php
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	<?php

	final class PhabricatorFlagsUIEventListener extends PhabricatorEventListener {

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

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

	private function handleActionEvent($event) {
	$user = $event->getUser();
	$object = $event->getValue('object');

	if (!$object \|\| !$object->getPHID()) {
	// If we have no object, or the object doesn't have a PHID yet, we can't
	// flag it.
	return;
	}

	if (!($object instanceof PhabricatorFlaggableInterface)) {
	return;
	}

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

	$flag = PhabricatorFlagQuery::loadUserFlag($user, $object->getPHID());

	if ($flag) {
	$color = PhabricatorFlagColor::getColorName($flag->getColor());
	$flag_action = id(new PhabricatorActionView())
	->setWorkflow(true)
	->setHref('/flag/delete/'.$flag->getID().'/')
	->setName(pht('Remove %s Flag', $color))
	->setIcon('flag-'.$flag->getColor());
	} else {
	$flag_action = id(new PhabricatorActionView())
	->setWorkflow(true)
	->setHref('/flag/edit/'.$object->getPHID().'/')
	->setName(pht('Flag For Later'))
	->setIcon('flag');

	if (!$user->isLoggedIn()) {
	$flag_action->setDisabled(true);
	}
	}

	$actions = $event->getValue('actions');
	$actions[] = $flag_action;
	$event->setValue('actions', $actions);
	}

	}