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8ac2da9850
Summary: Fixes T3698. Sometimes views need to render differently depending on whether they contain content or not. The existing approach for this is `isEmptyContent()`, which doesn't work well and is sort of hacky (it implies double-rendering content, which is not always free or side-effect free). Instead, provide a test for an element without children. This test is powerful enough to catch the easy cases of `null`, etc., and just do the expected thing, but will not catch a View which is reduced upon rendering. Since this is rare and we have no actual need for it today, just accept that as a limitation. Test Plan: Viewed Timeline and Feed UI examples. Viewed Feed (feed), Pholio (timelineview), and Differential (old transactionview). {F53915} Reviewers: chad, btrahan Reviewed By: chad CC: aran Maniphest Tasks: T3698 Differential Revision: https://secure.phabricator.com/D6718
145 lines
3.3 KiB
PHP
145 lines
3.3 KiB
PHP
<?php
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/**
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* @task children Managing Children
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*/
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abstract class AphrontView extends Phobject
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implements PhutilSafeHTMLProducerInterface {
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protected $user;
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protected $children = array();
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/* -( Configuration )------------------------------------------------------ */
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/**
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* @task config
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*/
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public function setUser(PhabricatorUser $user) {
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$this->user = $user;
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return $this;
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}
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/**
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* @task config
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*/
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protected function getUser() {
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return $this->user;
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}
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/* -( Managing Children )-------------------------------------------------- */
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/**
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* Test if this View accepts children.
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*
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* By default, views accept children, but subclases may override this method
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* to prevent children from being appended. Doing so will cause
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* @{method:appendChild} to throw exceptions instead of appending children.
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*
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* @return bool True if the View should accept children.
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* @task children
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*/
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protected function canAppendChild() {
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return true;
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}
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/**
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* Append a child to the list of children.
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*
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* This method will only work if the view supports children, which is
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* determined by @{method:canAppendChild}.
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*
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* @param wild Something renderable.
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* @return this
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*/
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final public function appendChild($child) {
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if (!$this->canAppendChild()) {
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$class = get_class($this);
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throw new Exception(
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pht("View '%s' does not support children.", $class));
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}
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$this->children[] = $child;
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return $this;
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}
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/**
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* Produce children for rendering.
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*
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* Historically, this method reduced children to a string representation,
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* but it no longer does.
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*
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* @return wild Renderable children.
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* @task
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*/
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final protected function renderChildren() {
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return $this->children;
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}
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/**
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* Test if an element has no children.
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*
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* @return bool True if this element has children.
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* @task children
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*/
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final public function hasChildren() {
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if ($this->children) {
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$this->children = $this->reduceChildren($this->children);
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}
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return (bool)$this->children;
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}
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/**
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* Reduce effectively-empty lists of children to be actually empty. This
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* recursively removes `null`, `''`, and `array()` from the list of children
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* so that @{method:hasChildren} can more effectively align with expectations.
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*
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* NOTE: Because View children are not rendered, a View which renders down
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* to nothing will not be reduced by this method.
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*
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* @param list<wild> Renderable children.
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* @return list<wild> Reduced list of children.
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* @task children
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*/
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private function reduceChildren(array $children) {
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foreach ($children as $key => $child) {
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if ($child === null) {
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unset($children[$key]);
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} else if ($child === '') {
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unset($children[$key]);
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} else if (is_array($child)) {
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$child = $this->reduceChildren($child);
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if ($child) {
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$children[$key] = $child;
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} else {
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unset($children[$key]);
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}
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}
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}
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return $children;
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}
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/* -( Rendering )---------------------------------------------------------- */
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abstract public function render();
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/* -( PhutilSafeHTMLProducerInterface )------------------------------------ */
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public function producePhutilSafeHTML() {
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return $this->render();
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}
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}
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