PhabricatorCommentEditEngineExtension.php
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	<?php

	final class PhabricatorCommentEditEngineExtension
	extends PhabricatorEditEngineExtension {

	const EXTENSIONKEY = 'transactions.comment';

	public function getExtensionPriority() {
	return 9000;
	}

	public function isExtensionEnabled() {
	return true;
	}

	public function getExtensionName() {
	return pht('Comments');
	}

	public function supportsObject(
	PhabricatorEditEngine $engine,
	PhabricatorApplicationTransactionInterface $object) {

	$xaction = $object->getApplicationTransactionTemplate();

	try {
	$comment = $xaction->getApplicationTransactionCommentObject();
	} catch (PhutilMethodNotImplementedException $ex) {
	$comment = null;
	}

	return (bool)$comment;
	}

	public function buildCustomEditFields(
	PhabricatorEditEngine $engine,
	PhabricatorApplicationTransactionInterface $object) {

	$comment_type = PhabricatorTransactions::TYPE_COMMENT;

	$comment_field = id(new PhabricatorCommentEditField())
	->setKey('comment')
	->setLabel(pht('Comments'))
	->setDescription(pht('Add comments.'))
	->setAliases(array('comments'))
	->setIsHidden(true)
	->setIsReorderable(false)
	->setIsDefaultable(false)
	->setIsLockable(false)
	->setTransactionType($comment_type)
	->setValue(null);

	return array(
	$comment_field,
	);
	}

	}