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<?php |
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/** |
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* Created by Vitaly Iegorov <[email protected]>. |
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* on 19.03.16 at 16:02 |
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*/ |
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namespace samsoncms\api; |
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use samsoncms\api\exception\RenderableViewNotSet; |
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use samsonframework\core\ViewInterface; |
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use samsonframework\view\View; |
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define('RENDERABLE_ITEMS_VARIABLE', 'items'); |
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define('RENDERABLE_ITEM_VARIABLE', 'item'); |
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/** |
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* Generic renderable methods and variables. |
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* |
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* @package samsoncms\api |
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*/ |
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trait Renderable |
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{ |
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/** @var string|callable Block view file or callback */ |
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protected $indexView; |
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/** @var string|callable Item view file or callback */ |
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protected $itemView; |
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/** @var string|callable Empty view file or callback */ |
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protected $emptyView; |
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/** @var ViewInterface View render object */ |
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protected $renderer; |
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/** @var int Count of entities on one page */ |
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protected $pageSize; |
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/** @var int Current page number */ |
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protected $pageNumber; |
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/** |
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* Set pagination for SamsonCMS query. |
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* |
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* @param int $pageNumber Result page number |
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* @param int|null $pageSize Results page size |
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* |
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* @return $this Chaining |
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*/ |
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public function pager($pageNumber, $pageSize = null) |
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{ |
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$this->pageNumber = $pageNumber; |
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$this->pageSize = null !== $pageSize ? $pageSize : $this->pageSize; |
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return $this; |
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} |
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/** |
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* Set index view path. |
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* |
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* @param string|callable|View $indexView Index view path or callback |
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* |
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* @return $this Chaining |
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*/ |
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public function indexView($indexView) |
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{ |
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$this->indexView = $indexView; |
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return $this; |
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} |
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/** |
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* Set item view path. |
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* |
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* @param string|callable|View $itemView Item view path or callback |
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* |
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* @return $this Chaining |
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*/ |
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public function itemView($itemView) |
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{ |
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$this->itemView = $itemView; |
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return $this; |
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} |
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/** |
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* Set empty view path. |
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* |
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* @param string|callable|View $emptyView Empty view path or callback |
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* |
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* @return $this Chaining |
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*/ |
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public function emptyView($emptyView) |
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{ |
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$this->emptyView = $emptyView; |
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return $this; |
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} |
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/** |
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* Render Entity collection item. |
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* |
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* @param mixed $item SamsonCMS entity for rendering |
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* |
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* @return string Rendered HTML |
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*/ |
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public function renderItem($item) |
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{ |
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// Set correct renderer old style or new \samsonframework\view |
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$renderer = ($this->itemView instanceof View) |
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? $this->itemView |
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: $this->renderer->view($this->itemView); |
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return $renderer |
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->set($item, RENDERABLE_ITEM_VARIABLE) |
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->output(); |
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} |
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/** |
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* Render empty collection item. |
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* |
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* @return string Rendered HTML |
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*/ |
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public function renderEmpty() |
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{ |
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// Set correct renderer old style or new \samsonframework\view |
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$renderer = ($this->emptyView instanceof View) |
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? $this->emptyView |
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: $this->renderer->view($this->emptyView); |
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return $renderer->output(); |
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} |
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/** |
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* Render Entity collection index. |
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* |
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* @param string $items Collection of rendered items |
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* |
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* @return string Rendered HTML |
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*/ |
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public function renderIndex($items) |
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{ |
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// Set correct renderer old style or new \samsonframework\view |
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$renderer = ($this->indexView instanceof View) |
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? $this->indexView |
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: $this->renderer->view($this->indexView); |
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return $renderer |
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->set($items, RENDERABLE_ITEMS_VARIABLE) |
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->output(); |
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} |
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/** @return string Rendered fields table */ |
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public function __toString() |
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{ |
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return $this->output(); |
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} |
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/** @return string Rendered HTML for fields table */ |
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public function output() |
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{ |
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// Validate renderable views |
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if ($this->indexView === null) { |
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throw new RenderableViewNotSet('indexView'); |
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} |
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if ($this->itemView === null) { |
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throw new RenderableViewNotSet('itemView'); |
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} |
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if ($this->emptyView === null) { |
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throw new RenderableViewNotSet('emptyView'); |
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} |
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// Perform SamsonCMS query |
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$collection = $this->find($this->pageNumber, $this->pageSize); |
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if (count($collection)) { |
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return $this->renderer($collection); |
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} else { // Render empty entity view |
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return $this->innerRender('', $collection, 'emptyView', 'renderEmpty'); |
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} |
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} |
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/** |
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* Collection items renderer. |
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* |
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* @param mixed $collection Items collection for rendering |
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* @return string Rendered items |
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*/ |
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protected function renderer($collection) |
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{ |
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// Render each entity view in collection |
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$html = ''; |
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foreach ($collection as $row) { |
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$html .= $this->innerRender($row, $collection, 'itemView', 'renderItem'); |
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} |
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// Render collection main view with items |
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return $this->innerRender($html, $collection, 'indexView', 'renderIndex'); |
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} |
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/** |
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* Generic view renderer. |
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* |
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* @param mixed $item |
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* @param Entity[] $collection |
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* @param string $variableName |
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* @param string $methodName |
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* |
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* @return mixed Rendered view |
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*/ |
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protected function innerRender($item, $collection, $variableName, $methodName) |
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{ |
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return is_callable($this->$variableName) |
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? call_user_func($this->$variableName, $item, $this->renderer, $this->query, $collection) |
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: $this->$methodName($item); |
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} |
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} |
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This check looks for methods that are used by a trait but not required by it.
To illustrate, let’s look at the following code example
The trait
Idableprovides a methodequalsIdthat in turn relies on the methodgetId(). If this method does not exist on a class mixing in this trait, the method will fail.Adding the
getId()as an abstract method to the trait will make sure it is available.