wagtail-picture-tag 1.0.1

A Wagtail app to add a picture tag.

Wagtail Picture Tag adds a picture template tag. This is not supposed to be a solution for all situations but to be a shortcut most.

It takes a the same parameters as the Wagtail Image tag but it can accept multiple size and format parameters. When multiple sizes are given media queries are automaticly generated to match. Multiple formats are sorted by file size.

It also takes the argument lazy that simply adds loading=”lazy” to the HTML tag.

By default it will try and create JPEG, PNG, JPEG and AVIF (if available). There are also two format shortcuts:

• photo - will create JPEG, WEBP and AVIF

• transparent - will create WEBP, PNG and AVIF

Currently Willow (the image library used by Wagtail) does not support AVIF but support can be patched in by installing willowavif package.

Quick start

1. Install the package:

   pip install wagtail-picture-tag

2. Add “wagtail-picture-tag” to your INSTALLED_APPS setting like this:

   INSTALLED_APPS = [
       ...
       'wagtail_picture_tag',
   ]

3. Include the tag in your template:

   {% load picture_tags %}

4. Use the tag:

   {% picture image photo fill-640x480 fill-320x240 %}

AVIF support

All that is needed is to install the willowavif package, it is then automatically imported and used.

Testing

Testing is done with pytest. Install and test can be done with:

pip install -r requirements.txt -r requirements.dev.txt
pytest