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[WIP] Columns: Add custom gutters via margin support and dynamic columns block #31987

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aaronrobertshaw
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Depends on: #31973
Related: #24874 & #31816

Description

The responsive behaviour of the columns block and its use of media queries prevents default use of margins block support to control gutters.

This PR is a proof of concept to convert the columns block to be dynamic and inject CSS variables for the margin into the markup. CSS variables cannot be added into the inline styles saved in the block content, they will get stripped out by kses.

Next Steps

How has this been tested?

Manually

  1. Toggle on customMargin support via experimental-theme.json
  2. Create a new post and paste in example block code from below snippet
  3. Select the columns blocks both the parent and nested child and adjust margin values
  4. The blocks should visually update with the values provided
  5. Switch back to the code editor view and confirm no inline styles for margin are in the block content
  6. Check the blocks render with correct margins on the frontend
  7. In both the editor and the frontend, resize the window and confirm the responsive behaviour of the block is appropriate.
    • In particular, that in the small viewport, the flex-basis is updated to be 50% - margin/2 to achieve 2 column layout
    • Columns should stack without margins on mobile

Test block code

<!-- wp:columns {"align":"full","style":{"spacing":{"margin":{"left":"4em"}}},"backgroundColor":"gray"} -->
<div class="wp-block-columns alignfull has-gray-background-color has-background"><!-- wp:column {"width":"66%","style":{"spacing":{"padding":{"top":"20px","right":"20px","bottom":"20px","left":"20px"}}},"backgroundColor":"orange"} -->
<div class="wp-block-column has-orange-background-color has-background" style="padding-top:20px;padding-right:20px;padding-bottom:20px;padding-left:20px;flex-basis:66%"><!-- wp:columns {"style":{"spacing":{"margin":{"left":"0px"}}}} -->
<div class="wp-block-columns"><!-- wp:column {"style":{"spacing":{"padding":{"top":"5px","right":"5px","bottom":"5px","left":"5px"}}},"backgroundColor":"blue"} -->
<div class="wp-block-column has-blue-background-color has-background" style="padding-top:5px;padding-right:5px;padding-bottom:5px;padding-left:5px"><!-- wp:paragraph -->
<p>Inner 1</p>
<!-- /wp:paragraph --></div>
<!-- /wp:column -->

<!-- wp:column {"style":{"spacing":{"padding":{"top":"5px","right":"5px","bottom":"5px","left":"5px"}}},"backgroundColor":"purple"} -->
<div class="wp-block-column has-purple-background-color has-background" style="padding-top:5px;padding-right:5px;padding-bottom:5px;padding-left:5px"><!-- wp:paragraph -->
<p>Inner 2</p>
<!-- /wp:paragraph --></div>
<!-- /wp:column --></div>
<!-- /wp:columns --></div>
<!-- /wp:column -->

<!-- wp:column {"style":{"spacing":{"padding":{"top":"20px","right":"20px","bottom":"20px","left":"20px"}}},"backgroundColor":"yellow"} -->
<div class="wp-block-column has-yellow-background-color has-background" style="padding-top:20px;padding-right:20px;padding-bottom:20px;padding-left:20px"><!-- wp:paragraph -->
<p>Outer 2</p>
<!-- /wp:paragraph --></div>
<!-- /wp:column --></div>
<!-- /wp:columns -->

Screenshots

Types of changes

New feature

Checklist:

  • My code is tested.
  • My code follows the WordPress code style.
  • My code follows the accessibility standards.
  • I've tested my changes with keyboard and screen readers.
  • My code has proper inline documentation.
  • I've included developer documentation if appropriate.
  • I've updated all React Native files affected by any refactorings/renamings in this PR (please manually search all *.native.js files for terms that need renaming or removal).

This converts the columns block to a dynamic block. This is so that CSS variables can be used for the margin support values. Which in turn allows CSS to utilise these in responsive styles.
@aaronrobertshaw aaronrobertshaw added [Type] Enhancement A suggestion for improvement. [Status] In Progress Tracking issues with work in progress [Block] Columns Affects the Columns Block [Feature] Design Tools Tools that impact the appearance of blocks both to expand the number of tools and improve the experi labels May 19, 2021
@aaronrobertshaw aaronrobertshaw self-assigned this May 19, 2021
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Size Change: +298 B (0%)

Total Size: 1.31 MB

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@aaronrobertshaw
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Closing this in favour of CSS Grid approach.

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[Block] Columns Affects the Columns Block [Feature] Design Tools Tools that impact the appearance of blocks both to expand the number of tools and improve the experi [Status] In Progress Tracking issues with work in progress [Type] Enhancement A suggestion for improvement.
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