README

Responsive Image component for WordPress. Handles retina sizes & different image shape for mobile.

• Allows images to have normal & retina size
• Allows images to have different mobile image in different aspect ratio
• Automatically handles lazyload
• Uses Picture tag for images & custom background style set for background images.

Install

composer require pixelshelsinki/images

Usage

Pixels Images consists of individual classes for image handling + a static factory for easily using them. Before using new image handlers you just have to register image sizes using the Factory class.

Register image sizes.

Declare your image sizes in your theme / plugin. Good spot would be 'init' action hook.

<?php

use Pixels\Components\Images\Factory as ImageFactory;

/**
 * Image sizes array
 * Pattern:
 *
 * NAME, WIDTH, HEIGHT, CROP, RETINA TRUE/FALSE
 *
 * @var array
 */
$sizes = array(
    'page-hero'        => array( 1100, 500, true, true ),
    'page-hero-mobile' => array( 375, 500, true, true ),
);

// Register sizes to image factory.
ImageFactory::add_image_sizes( $sizes );

/**
 * You can also optionally register css-style breakpoint for mobile / desktop.
 * Default is 576px.
 */
ImageFactory::add_breakpoint( '600px' );

Using responsive picture.

Usage in PHP:

<?php

use Pixels\Components\Images\Factory as ImageFactory;

$image_html = ImageFactory::responsive_image( $image_id, 'my_mobile_size', 'my_desktop_size', 'my alt text' );

echo $image_html;

Using responsive background.

Usage in PHP. Note that element with given CSS selector must exist in dom. Can be any valid css selector, like class or id.:

<?php

use Pixels\Components\Images\Factory as ImageFactory;

$image_html = ImageFactory::responsive_background( $image_id, 'my_mobile_size', 'my_desktop_size', '#my_html_element' );

echo $image_html;

Using with Twig / Timber.

Easiest way is to register the factory functions as Twig helper functions.

<?php

add_filter( 'get_twig', array( 'add_image_functions' ) );

function add_image_functions( $twig ) {
    // Responsive mage helper functions.
    $twig->addFunction( new \Timber\Twig_Function( 'responsive_image', '\\Pixels\\Components\\Images\\Factory::responsive_image' ) );
    $twig->addFunction( new \Timber\Twig_Function( 'responsive_background', '\\Pixels\\Components\\Images\\Factory::responsive_background' ) );

    return $twig;
}