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PhorgeFlagFlaggedObjectCustomField.php
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			<?php

			final class PhorgeFlagFlaggedObjectCustomField extends PhabricatorCustomField {

			private $flag;

			public function getFieldKey() {
			return 'flag:flag';
			}
			public function shouldAppearInPropertyView() {
			return false;
			}

			public function shouldAppearInListView() {
			return true;
			}

			public function renderOnListItem(PHUIObjectItemView $view) {
			if (!$this->flag) {
			return;
			}
			// I'm very open to improvements in the way a Flag is displayed
			$icon = PhabricatorFlagColor::getIcon($this->flag->getColor());
			$view->addIcon($icon);
			}


			public function shouldUseStorage() {
			return true;
			}

			public function setValueFromStorage($value) {
			$this->flag = $value;
			}

			// The parent function is defined to return a PhabricatorCustomFieldStorage,
			// but that assumes a DTO with a particular form; That doesn't apply here.
			// Maybe the function needs to be re-defined with a suitable interface.
			// For now, PhorgeFlagFlaggedObjectFieldStorage just duck-types into the
			// right shape.
			public function newStorageObject() {
			return id(new PhorgeFlagFlaggedObjectFieldStorage())
			->setViewer($this->getViewer());
			}

			}