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<?php

namespace Drupal\Core\Ajax;

/**
 * An AJAX command for calling the jQuery css() method.
 *
 * The 'css' command will instruct the client to use the jQuery css() method to
 * apply the CSS arguments to elements matched by the given selector.
 *
 * This command is implemented by Drupal.AjaxCommands.prototype.css() defined
 * in misc/ajax.js.
 *
 * @see http://docs.jquery.com/CSS/css#properties
 *
 * @ingroup ajax
 */
class CssCommand implements CommandInterface {

  /**
   * A CSS selector string.
   *
   * If the command is a response to a request from an #ajax form element then
   * this value can be NULL.
   *
   * @var string
   */
  protected $selector;

  /**
   * An array of property/value pairs to set in the CSS for the selector.
   *
   * @var array
   */
  protected $css = [];

  /**
   * Constructs a CssCommand object.
   *
   * @param string $selector
   *   A CSS selector for elements to which the CSS will be applied.
   * @param array $css
   *   An array of CSS property/value pairs to set.
   */
  public function __construct($selector, array $css = []) {
    $this->selector = $selector;
    $this->css = $css;
  }

  /**
   * Adds a property/value pair to the CSS to be added to this element.
   *
   * @param $property
   *   The CSS property to be changed.
   * @param $value
   *   The new value of the CSS property.
   *
   * @return $this
   */
  public function setProperty($property, $value) {
    $this->css[$property] = $value;
    return $this;
  }

  /**
   * Implements Drupal\Core\Ajax\CommandInterface:render().
   */
  public function render() {

    return [
      'command' => 'css',
      'selector' => $this->selector,
      'argument' => $this->css,
    ];
  }

}