File elements/google-maps.php

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<?php

namespace SIW\Elements;

use SIW\CSS;
use SIW\HTML;

/**
 * Google Maps kaart
 * 
 * @copyright 2019 SIW Internationale Vrijwilligersprojecten
 * @since     3.0.0
 * 
 * @see       https://developers.google.com/maps/documentation/javascript/tutorial
 */
class Google_Maps {

    /**
     * URL voor Google Maps API
     *
     * @var string
     */
    const API_URL = 'https://maps.googleapis.com/maps/api/js';

    /**
     * Google Maps API-key
     *
     * @var string
     */
    protected $api_key;

    /**
     * Hoogt van kaart in pixels
     *
     * @var int
     */
    protected $height = 300;

    /**
     * Markers voor op kaart
     *
     * @var array
     */
    protected $markers = [];

    /**
     * Opties voor kaart
     *
     * @var array
     */
    protected $options = [
        'zoom'              => 6,
        'zoomControl'       => true,
        'mapTypeControl'    => false,
        'scaleControl'      => false,
        'streetViewControl' => false,
        'rotateControl'     => false,
        'fullscreenControl' => false
    ];

    /**
     * Init
     *
     * @param string $id
     */
    public function __construct() {
        $this->api_key = siw_get_option( 'google_maps_api_key' );
        if ( empty( $this->api_key ) ) {
            return;
        }
        $this->enqueue_scripts();
        $this->enqueue_styles();
        add_filter( 'siw_preconnect_urls', [ $this, 'add_urls'] );
    }

    /**
     * Zet hoogte van de kaart
     *
     * @param int $height
     */
    protected function set_height( int $height ) {
        $this->height = $height;
    }

    /**
     * Zet opties voor kaart
     *
     * @param array $options
     */
    public function set_options( array $options ) {
        $this->options = wp_parse_args( $options, $this->options );
    }

    /**
     * Zet het midden van de kaart
     *
     * @param float $lat
     * @param float $lng
     */
    public function set_center( float $lat, float $lng ) {
        $this->options['center'] = [ 'lat' => $lat, 'lng' => $lng ];
    }

    /**
     * Zet het midden van de kaart op basis van een locatie
     *
     * @param string $location
     */
    public function set_location_center( string $location ) {
        $this->options['center'] = $location;
    }

    /**
     * Voegt marker toe
     *
     * @param float $lat
     * @param float $lng
     * @param string $title
     * @param string $description
     */
    public function add_marker( float $lat, float $lng, string $title, string $description = '' ) {
        if ( ! isset( $this->options['center'] ) ) {
            $this->options['center'] = [ 'lat' => $lat, 'lng' => $lng ];
        }
        $this->markers[] = [
            'title'       => $title,
            'description' => $description,
            'position'    => [ 'lat' => $lat, 'lng' => $lng ],
        ];
    }

    /**
     * Voegt marker op locatie toe
     *
     * @param string $location
     * @param string $title
     * @param string $description
     */
    public function add_location_marker( string $location, string $title, string $description = '' ) {
        if ( ! isset( $this->options['center'] ) ) {
            $this->options['center'] = $location;
        }
        $this->markers[] = [
            'title'       => $title,
            'description' => $description,
            'position'    => $location,
        ];
    }

    /**
     * Rendert de kaart
     */
    public function render() {
        echo $this->generate();
    }

    /**
     * Genereert kaart
     * 
     * @return string
     */
    public function generate() {
        $attributes = [
            'id'           => uniqid('siw-google-map-'),
            'class'        => 'siw-google-map',
            'data-options' => $this->options,
            'data-markers' => $this->markers,
        ];
        return HTML::generate_tag( 'div', $attributes, null, true );
    }

    /**
     * Voegt scripts toe
     */
    public function enqueue_scripts() {
        $google_maps_url = add_query_arg( [
            'key'      => $this->api_key,
        ], self::API_URL );
        wp_enqueue_script( 'google-maps', $google_maps_url, [], null, true );
        wp_enqueue_script( 'siw-google-maps', SIW_ASSETS_URL . 'js/elements/siw-google-maps.js', [ 'google-maps'], SIW_PLUGIN_VERSION, true );
    }

    /**
     * Voegt inline styling toe
     */
    public function enqueue_styles() {
        wp_register_style( 'siw-google-maps', false );
        wp_enqueue_style( 'siw-google-maps' );

        $inline_style = CSS::generate_inline_css( [
            '.siw-google-map' => [ 'height' => "{$this->height}px" ],
        ]);
        wp_add_inline_style( 'siw-google-maps', $inline_style );
    }

    /**
     * Voegt url's toe t.b.v. DNS-prefetch en preconnect
     *
     * @param array $urls
     * @return array
     * 
     * @todo werkt pas als de constructor eerder aangeroepen wordt.
     */
    public function add_urls( array $urls ) {
        $urls[] = 'maps.googleapis.com';
        $urls[] = 'maps.google.com';
        $urls[] = 'maps.gstatic.com';
        $urls[] = 'csi.gstatic.com';
        return $urls;
    }
}

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