Portland WP Meetup - Hooks and Filters - Jan 08 2018 - Hooks and Filters in a plugins and Class

plugin.php

<?php
/**
 * Plugin Name: TheAudioBeatnik Category Slideshow
 * Description: A category page slideshow using Slick.js and WP Plugin Advanced Custom Fields
 * Author: Adam LaBarge
 * Version: 1.0
 * Author URI: https://www.linkedin.com/in/adamlabarge
 */

class tab_CategorySlideShow {
    public function init () {
        // unhook remove_catchresponsive_featured_overall_image
        $this->hook_custom_template();

        // setup assets
        $this->css();
        $this->js();

        // setup ACF slideshow fields
        $this->acf_slideshow_fieldgroup();

        // build slideshow
        $this->hook_in_slideshow();
    }

    public function hook_custom_template() {
        add_filter('template_include', array($this, 'get_archive_template'));
    }

    public function get_archive_template($template) {
        if (is_archive())
            return plugin_dir_path( __FILE__ ) . 'archive.php';

        return $template;
    }

    public function hook_in_slideshow() {
        add_action('tab_category_pages_slideshow', array($this, 'make_slideshow'), 40);
    }

    public function make_slideshow() {
        if (! function_exists('get_field')) return;
        $slides = get_field('tab_category_slideshow', array_shift(get_the_category()));
        if (! $slides) return;
        ?>
            <style>
                .page-header .page-title {border: none;}
                .tab-category-slideshow {max-width: 780px; margin: 15px 0 20px 20px;}
                .tab-category-slideshow .hide { display: none;}
                .tab-category-slideshow button.slick-arrow {display: none !important;}
            </style>
            <div class="tab-category-slideshow">
        <?php

            foreach ($slides as $key => $slide) {
                if ($slide['tab_disable_slide'][0]) continue;
                $target = ($slide['tab_open_in_same_page'][0]) ? '' : '_blank';
                $class = ($key > 0) ? 'hide' : '';
                ?>
                    <div class="slide <?php echo $class; ?>">
                        <a target="<?php echo $target; ?>" href="<?php echo $slide['tab_link']; ?>" title="Add on The Audio Beatnik" rel="nofollow">
                            <img src="<?php echo $slide['tab_slide']; ?>" title="<?php $slide['tab_img_alt_tag_text']; ?>" alt="<?php $slide['tab_img_alt_tag_text']; ?>">
                        </a>
                    </div>
                <?php
            }

        ?>
            </div>
        <?php
    }
    
    public function css() {
        wp_enqueue_style(
            'tab_homepageslideshow_slick', 
            plugin_dir_url( __FILE__ ) . 'slick/slick/slick.css'
        );     
        wp_enqueue_style(
            'tab_homepageslideshow_slick_theme', 
            plugin_dir_url( __FILE__ ) . 'slick/slick/slick-theme.css'
        );     
    }

    public function js() {
        wp_enqueue_script(
            'tab_homepageslideshow_slick',
            plugin_dir_url( __FILE__ ) . 'slick/slick/slick.min.js',
            array(),
            '1.0.1',
            true
        );
        wp_enqueue_script(
            'tab_homepageslideshow',
            plugin_dir_url( __FILE__ ) . 'javascript/tab_js.js',
            array(),
            '1.0',
            true
        );
    }

    public function acf_slideshow_fieldgroup() {
        if (function_exists('acf_add_local_field_group')) :
            acf_add_local_field_group(array (
                'key' => 'group_59cdb50018892',
                'title' => 'The Audio Beatnik Category Pages Slideshow',
                'fields' => array (
                    array (
                        'key' => 'field_59cdb54e39ccd',
                        'label' => 'TAB Category Slideshow',
                        'name' => 'tab_category_slideshow',
                        'type' => 'repeater',
                        'instructions' => '',
                        'required' => 0,
                        'conditional_logic' => 0,
                        'wrapper' => array (
                            'width' => '',
                            'class' => '',
                            'id' => '',
                        ),
                        'collapsed' => '',
                        'min' => 0,
                        'max' => 0,
                        'layout' => 'row',
                        'button_label' => 'Add Slide',
                        'sub_fields' => array (
                            array (
                                'key' => 'field_59cdba940262a',
                                'label' => 'Link',
                                'name' => 'tab_link',
                                'type' => 'url',
                                'instructions' => 'Enter full link a click should take the user to. example: https://google.com',
                                'required' => 0,
                                'conditional_logic' => 0,
                                'wrapper' => array (
                                    'width' => '',
                                    'class' => '',
                                    'id' => '',
                                ),
                                'default_value' => '',
                                'placeholder' => '',
                            ),
                            array (
                                'key' => 'field_59cdbabb0262b',
                                'label' => 'Open in same page?',
                                'name' => 'tab_open_in_same_page',
                                'type' => 'checkbox',
                                'instructions' => 'Will open new tab by default.',
                                'required' => 0,
                                'conditional_logic' => 0,
                                'wrapper' => array (
                                    'width' => '',
                                    'class' => '',
                                    'id' => '',
                                ),
                                'choices' => array (
                                    'Yes' => 'Yes',
                                ),
                                'allow_custom' => 0,
                                'save_custom' => 0,
                                'default_value' => array (
                                ),
                                'layout' => 'vertical',
                                'toggle' => 0,
                                'return_format' => 'value',
                            ),
                            array (
                                'key' => 'field_59cdbae20262c',
                                'label' => 'Slide',
                                'name' => 'tab_slide',
                                'type' => 'file',
                                'instructions' => 'Image Size: 780x260',
                                'required' => 0,
                                'conditional_logic' => 0,
                                'wrapper' => array (
                                    'width' => '',
                                    'class' => '',
                                    'id' => '',
                                ),
                                'return_format' => 'url',
                                'library' => 'all',
                                'min_size' => '',
                                'max_size' => '',
                                'mime_types' => '',
                            ),
                            array (
                                'key' => 'field_59cdbb8a524d6',
                                'label' => 'Image Alt Tag Text',
                                'name' => 'tab_img_alt_tag_text',
                                'type' => 'text',
                                'instructions' => 'Add image alternate text here.	Will be used for title tag as well.',
                                'required' => 0,
                                'conditional_logic' => 0,
                                'wrapper' => array (
                                    'width' => '',
                                    'class' => '',
                                    'id' => '',
                                ),
                                'default_value' => '',
                                'placeholder' => '',
                                'prepend' => '',
                                'append' => '',
                                'maxlength' => '',
                            ),
                            array (
                                'key' => 'field_59cdbafb0262d',
                                'label' => 'Disable',
                                'name' => 'tab_disable_slide',
                                'type' => 'checkbox',
                                'instructions' => 'Checking yes will hide this slide from the slideshow.',
                                'required' => 0,
                                'conditional_logic' => 0,
                                'wrapper' => array (
                                    'width' => '',
                                    'class' => '',
                                    'id' => '',
                                ),
                                'choices' => array (
                                    'Yes' => 'Yes',
                                ),
                                'allow_custom' => 0,
                                'save_custom' => 0,
                                'default_value' => array (
                                ),
                                'layout' => 'vertical',
                                'toggle' => 0,
                                'return_format' => 'value',
                            ),
                        ),
                    ),
                ),
                'location' => array (
                    array (
                        array (
                            'param' => 'taxonomy',
                            'operator' => '==',
                            'value' => 'all',
                        ),
                    ),
                ),
                'menu_order' => 0,
                'position' => 'acf_after_title',
                'style' => 'default',
                'label_placement' => 'top',
                'instruction_placement' => 'label',
                'hide_on_screen' => '',
                'active' => 1,
                'description' => '',
            ));
        endif;
    }
}

add_action('init', 'tab_ActivateCategorySlideShow');
function tab_ActivateCategorySlideShow() {
    // check to see if ACF functions exist
    if (function_exists('get_field')
        || function_exists('acf_add_options_page')
        || function_exists('acf_add_local_field_group')) {
        $tab_CategorySlideShow = new tab_CategorySlideShow();
        $tab_CategorySlideShow->init();
    }
}

?>