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<?php |
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declare(strict_types=1); |
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namespace Yiisoft\Widget; |
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use RuntimeException; |
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use Stringable; |
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use Yiisoft\Definitions\Exception\CircularReferenceException; |
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use Yiisoft\Definitions\Exception\InvalidConfigException; |
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use Yiisoft\Definitions\Exception\NotInstantiableException; |
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use Yiisoft\Factory\NotFoundException; |
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use Yiisoft\Html\NoEncodeStringableInterface; |
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use function array_key_exists; |
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use function array_pop; |
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use function is_array; |
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use function sprintf; |
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/** |
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* Widget generates a string content based on some logic and input data. |
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* These are typically used in templates to conceal complex HTML rendering logic. |
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* |
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* This is the base class that is meant to be inherited when implementing your own widgets. |
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*/ |
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abstract class Widget implements NoEncodeStringableInterface, Stringable |
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{ |
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/** |
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* The widgets that are currently opened and not yet closed. |
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* This property is maintained by {@see begin()} and {@see end()} methods. |
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* |
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* @var static[] |
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*/ |
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private static array $stack = []; |
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/** |
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* Used to open a wrapping widget (the one with begin/end). |
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* |
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* When implementing this method, don't forget to call `parent::begin()`. |
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* |
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* @return string|null Opening part of widget markup. |
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*/ |
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public function begin(): ?string |
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{ |
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self::$stack[] = $this; |
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return null; |
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} |
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/** |
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* Checks that the widget was opened with {@see begin()}. If so, runs it and returns content generated. |
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* |
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* @throws RuntimeException |
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*/ |
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final public static function end(): string |
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{ |
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if (self::$stack === []) { |
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throw new RuntimeException(sprintf( |
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'Unexpected "%s::end()" call. A matching "%s::begin()" is not found.', |
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static::class, |
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static::class, |
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)); |
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} |
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$widget = array_pop(self::$stack); |
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$widgetClass = $widget::class; |
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if ($widgetClass !== static::class) { |
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throw new RuntimeException(sprintf( |
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'Expecting "%s::end()" call, found "%s::end()".', |
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$widgetClass, |
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static::class, |
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)); |
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} |
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return (string) $widget->render(); |
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} |
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/** |
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* Creates a widget instance. |
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* |
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* @param array|callable|string $config The parameters for creating a widget. |
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* |
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* @throws InvalidConfigException |
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* @throws CircularReferenceException |
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* @throws NotInstantiableException |
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* @throws NotFoundException |
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* |
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* @return static The widget instance. |
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*/ |
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final public static function widget(array|callable|string $config = []): self |
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{ |
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if (is_array($config) && !array_key_exists('class', $config)) { |
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$config['class'] = static::class; |
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} |
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return WidgetFactory::createWidget($config); |
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} |
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/** |
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* Allows not to call `->render()` explicitly: |
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* |
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* ```php |
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* <?= MyWidget::widget(); ?> |
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* ``` |
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*/ |
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1 |
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final public function __toString(): string |
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{ |
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return (string) $this->render(); |
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} |
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/** |
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* Renders widget content. |
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* |
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* This method must be overridden when implementing concrete widget. |
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* |
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* @return string|Stringable The result of widget execution to be outputted. |
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*/ |
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abstract public function render(): string|Stringable; |
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} |
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yiisoft /
widget
