Issue #2928592 by zuhair_ak, rameshkisku: Add the facetapi bootstrap plugin

<?php

/**

 * Widget that renders facets as a list of clickable checkboxes.

 *

 * This widget renders facets in the same way as FacetapiWidgetLinks but uses

 * JavaScript to transform the links into checkboxes followed by the facet.

 */

class FacetapiWidgetDropdownsCheckboxLinks extends FacetapiWidgetCheckboxLinks {

    /**

     * Overrides FacetapiWidgetLinks::init().

     *

     * Adds additional JavaScript settings and CSS.

     */

    public function init() {

        parent::init();

        // Add dropdown filters.

        if (isset($this->settings->settings['filter']) && $this->settings->settings['filter']) {

            $this->build['#attached']['js'][] = drupal_get_path('module', 'facetapi_bootstrap_dropdown_widget') . '/js/diacritics.js';

            $this->build['#attached']['js'][] = drupal_get_path('module', 'facetapi_bootstrap_dropdown_widget') . '/js/bootstrap-dropdown-filter.js';

            $this->build['#attributes']['class'][] = 'dropdown-filter panel-body';

        }

    }

    /**

     * Implements FacetapiWidget::execute().

     *

     * Transforms the render array into something that can be themed by

     * theme_item_list().

     *

     * @see FacetapiWidgetLinks::setThemeHooks()

     * @see FacetapiWidgetLinks::buildListItems()

     */

    public function execute() {

        $element = &$this->build[$this->facet['field alias']];

        // Sets each item's theme hook, builds item list.

        $this->setThemeHooks($element);

        $element = array(

          '#theme' => 'bootstrap_dropdown_facet',

          '#title' => $this->settings->settings['label'],

          '#items' => $this->buildListItems($element),

          '#attributes' => $this->build['#attributes'],

        );

    }

    /**

     * Overrides FacetapiWidget::settingsForm().

     */

    function settingsForm(&$form, &$form_state) {

        parent::settingsForm($form, $form_state);

        $states = array(

          'visible' => array(

            'select[name="widget"]' => array('value' => $this->id),

          ),

        );

        $form['widget']['widget_settings']['links'][$this->id]['label'] = array(

          '#title' => t('Dropdown label'),

          '#type' => 'textfield',

          '#default_value' => !empty($this->settings->settings['label']) ? $this->settings->settings['label'] : t('Select'),

          '#states' => $states,

        );

        $form['widget']['widget_settings']['links'][$this->id]['filter'] = array(

          '#title' => t('Filter Facet.'),

          '#type' => 'checkbox',

          '#default_value' => !empty($this->settings->settings['filter']) ? $this->settings->settings['filter'] : '',

          '#states' => $states,

        );

    }

}