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<?php namespace Anomaly\DashboardModule\Widget; |
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use Anomaly\DashboardModule\Widget\Command\GetSortableFlag; |
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use Anomaly\DashboardModule\Widget\Contract\WidgetInterface; |
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use Anomaly\DashboardModule\Widget\Extension\Contract\WidgetExtensionInterface; |
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use Anomaly\Streams\Platform\Model\Dashboard\DashboardWidgetsEntryModel; |
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use Anomaly\UsersModule\Role\RoleCollection; |
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/** |
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* Class WidgetModel |
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* |
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* @link http://pyrocms.com/ |
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* @author PyroCMS, Inc. <[email protected]> |
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* @author Ryan Thompson <[email protected]> |
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*/ |
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class WidgetModel extends DashboardWidgetsEntryModel implements WidgetInterface |
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{ |
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/** |
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* The widget data. |
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* |
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* @var WidgetCollection |
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*/ |
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protected $data; |
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/** |
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* Create a new WidgetModel instance. |
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* |
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* @param array $attributes |
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*/ |
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public function __construct(array $attributes = []) |
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{ |
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$this->data = new WidgetCollection(); |
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parent::__construct($attributes); |
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} |
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/** |
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* Get the pinned flag. |
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* |
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* @return bool |
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*/ |
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public function isPinned() |
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{ |
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return $this->pinned; |
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} |
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/** |
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* Get the column. |
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* |
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* @return int |
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*/ |
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public function getColumn() |
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{ |
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return $this->column; |
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} |
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/** |
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* Get the extension. |
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* |
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* @return WidgetExtensionInterface |
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*/ |
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public function getExtension() |
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{ |
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return $this->extension; |
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} |
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/** |
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* Get the allowed roles. |
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* |
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* @return RoleCollection |
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*/ |
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public function getAllowedRoles() |
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{ |
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return $this->allowedRoles()->get(); |
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} |
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/** |
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* Get the content. |
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* |
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* @return string |
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*/ |
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public function getContent() |
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{ |
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return $this->content; |
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} |
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/** |
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* Set the content. |
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* |
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* @param $content |
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* @return $this |
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*/ |
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public function setContent($content) |
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{ |
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$this->content = $content; |
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return $this; |
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} |
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/** |
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* Get the data. |
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* |
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* @return WidgetData |
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*/ |
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public function getData() |
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{ |
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return $this->data; |
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} |
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/** |
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* Add to the widget data. |
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* |
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* @param $key |
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* @param $data |
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* @return $this |
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*/ |
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public function addData($key, $data) |
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{ |
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$this->data->put($key, $data); |
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return $this; |
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} |
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/** |
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* Return the sortable flag. |
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* |
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* @return bool |
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*/ |
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public function isSortable() |
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{ |
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return $this->dispatch(new GetSortableFlag($this)); |
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} |
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/** |
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* Return the widget's context. |
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* |
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* @return string |
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*/ |
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public function context() |
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{ |
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$extension = $this->getExtension(); |
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return $extension->getContext(); |
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} |
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/** |
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* Return the widget output. |
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* |
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* @return string |
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*/ |
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public function output() |
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{ |
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$extension = $this->getExtension(); |
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return $extension->output($this); |
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} |
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} |
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If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design.
Let’s take a look at an example:
Our function
my_function
expects aPost
object, and outputs the author of the post. The base classPost
returns a simple string and outputting a simple string will work just fine. However, the child classBlogPost
which is a sub-type ofPost
instead decided to return anobject
, and is therefore violating the SOLID principles. If aBlogPost
were passed tomy_function
, PHP would not complain, but ultimately fail when executing thestrtoupper
call in its body.