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Stefan Antonelli: Plone 6 Theming from Scratch

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Talk at Plone Conference 2020

How to create a theme for Plone 6. Quite easy, because the templates use Bootstrap 5 classes. We build a theme from scratch, no Barceloneta, no Diazo.

First step is to create an empty plone_addon package with plonecli or mr.bob. For the questions you can answer: use Plone 5.2.1. We will switch later. My theme is plonetheme.munich.

I recommend to cleanup the standard package a bit. I remove tests, constraints for Plone 4 and 5. Check it out in the commits.

Now switch to extend Plone 6 and run the buildout.

You can add theme structure with a bob template, but I prefer creating my own.

Some interesting files:

  • package.json lists various tasks, especially the watch task.
  • In the theme manifest.cfg we more or less disable Diazo by emptying the rules line.
  • The compiled CSS and JavaScript are registered in registry.xml.

You can compile SASS to CSS using npm or yarn. Do yarn install in the top of your package. Later, with yarn dist you make it ready for production.

After these steps Plone is partially broken, or at least ugly. I do some basic fixes and it looks better.

For templates that you need to change you add z3c.jbot overrides. Personally I always kick out the "search in section" checkbox.

I don't like columns, but for this example I kept them. In most cases I need just one column. Plus maybe a side bar for portlets, but portlets must die.

With plonetheme.tokyo everything is Bootstrap, no columns, so no portlets, really fully responsive. This was the package where we built on Barceloneta Plone 5.2 and introduced lots of template overrides to put in Bootstrap. For Plone 6 we can just remove the overrides.

What about the toolbar? Yes, we dropped it. We bring editing features and navigation together. This is now a few feature: collective.sidebar. It is only one template to override. It works for Plone 5.2 at the moment, and I may work on it for Plone 6 during the sprints.

Question: is TTW still a viable path?

Answer: I like to concentrate on one path. I am not an expert in TTW theming. I switched to file system, except really small customizations. For small CSS customizations there is a field in the theming control panel.

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