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Style Engine: add elements to the frontend #41732

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merged 10 commits into from
Jul 14, 2022

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ramonjd
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@ramonjd ramonjd commented Jun 15, 2022

What?

Migrates elements style generation to the style engine.

This PR affects the editor only.

The related backend PR took care of the element styles for the frontend site:

Tracking PR:

Why?

To continue the perilous journey of style generation consolidation!

How?

The style engine now checks for an elements property, and the loops over each element's styles to generate the style rules.

I've decided to bring the frontend to the same status as the backend (#40987).

We'll need to think about how, and if, we want to generate styles using the entire elements object.

Testing Instructions

I'm using Empty Theme.

Create a new post and add the following block code. Or roll your own!

Test block HTML
<!-- wp:paragraph {"style":{"elements":{"link":{"color":{"text":"#1a8ff6"}}}}} -->
<p class="has-link-color"><a href="https://test.com">Test</a> paragraph with a link.</p>
<!-- /wp:paragraph -->

<!-- wp:paragraph {"style":{"elements":{"link":{"color":{"text":"#4b1380"}}}}} -->
<p class="has-link-color"><a href="https://test.com">Test</a> paragraph with a link.</p>
<!-- /wp:paragraph -->

<!-- wp:heading {"level":6,"style":{"elements":{"link":{"color":{"text":"var:preset|color|vivid-red"}}},"color":{"text":"#65e1cc"}}} -->
<h6 class="has-text-color has-link-color" style="color:#65e1cc">Heading with a <a href="https://wordpress.org">link</a></h6>
<!-- /wp:heading -->

<!-- wp:group {"style":{"elements":{"link":{"color":{"text":"var:preset|color|luminous-vivid-amber"}}}}} -->
<div class="wp-block-group has-link-color"><!-- wp:paragraph -->
<p><a href="https://wordpress.org">Test</a> paragraph with a link inside a group;</p>
<!-- /wp:paragraph --></div>
<!-- /wp:group -->

Check that the editor links appear and behave as you'd expect.

Screen Shot 2022-06-17 at 2 30 15 pm

Run the tests!

npm run test-unit packages/style-engine/src/test/index.js

@ramonjd ramonjd added [Type] Experimental Experimental feature or API. CSS Styling Related to editor and front end styles, CSS-specific issues. [Package] Style Engine /packages/style-engine labels Jun 15, 2022
@ramonjd ramonjd requested a review from ellatrix as a code owner June 15, 2022 05:02
@ramonjd ramonjd self-assigned this Jun 15, 2022
@ramonjd ramonjd requested review from getdave and removed request for ellatrix June 15, 2022 05:02
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github-actions bot commented Jun 15, 2022

Size Change: +125 B (0%)

Total Size: 1.25 MB

Filename Size Change
build/block-editor/index.min.js 152 kB +143 B (0%)
build/block-editor/style-rtl.css 14.5 kB -7 B (0%)
build/block-editor/style.css 14.5 kB -6 B (0%)
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build/edit-post/style-rtl.css 6.97 kB -73 B (-1%)
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build/edit-site/index.min.js 52 kB +19 B (0%)
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build/edit-widgets/style-rtl.css 4.35 kB -11 B (0%)
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build/editor/style.css 3.65 kB -17 B (0%)
build/media-utils/index.min.js 2.93 kB +21 B (+1%)
ℹ️ View Unchanged
Filename Size
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@ramonjd ramonjd force-pushed the update/style-engine-frontend-elements branch from 05571c1 to d151bd1 Compare June 17, 2022 04:31
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@ramonjd ramonjd force-pushed the update/style-engine-frontend-elements branch from 9480abe to 5a9c149 Compare June 20, 2022 09:59
@ramonjd
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ramonjd commented Jun 20, 2022

Thanks for testing this branch and for helping to make it better @kevin940726 !!

@glendaviesnz
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@ramonjd When testing this I noticed there is a difference in the handling of specificity of element styles between the editor and the frontend - seems to be the same on trunk as well though, so maybe out of the scope of this PR.

If I set an h2 element in themes theme.json styles.elements with:

	"h2": {
		"color": {
			"text": "purple",
			"background": "pink"
		}
    }

and also set it under styles.blocks with:

	"core/heading": {
		"elements": {
			"h2": {
				"color": {
					"text": "purple",
					"background": "red"
				}
			}
		}
	},

The frontend shows the styles.elements values:
Screen Shot 2022-06-28 at 10 51 57 AM

but in the editor it shows styles.blocks values:
Screen Shot 2022-06-28 at 10 52 38 AM

@ramonjd
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ramonjd commented Jun 28, 2022

When testing this I noticed there is a difference in the handling of specificity of element styles between the editor and the frontend - seems to be the same on trunk as well though, so maybe out of the scope of this PR.

Oh! Thanks for testing this @glendaviesnz

Interesting. In empty theme, I'm seeing it working on trunk:

Screen Shot 2022-06-28 at 2 26 13 pm

And breaking on this PR

Screen Shot 2022-06-28 at 2 34 06 pm

On the frontend. 🤷

theme.json
{
	"version": 2,
	"settings": {
		"appearanceTools": true,
		"layout": {
			"contentSize": "840px",
			"wideSize": "1100px"
		}
	},
	"styles": {
		"elements": {
			"h2": {
				"color": {
					"text": "white",
					"background": "pink"
				}
			}
		},
		"blocks": {
			"core/heading": {
				"elements": {
					"h2": {
						"color": {
							"text": "black",
							"background": "red"
						}
					}
				}
			}
		}
	},
	"patterns": [
		"short-text-surrounded-by-round-images",
		"partner-logos"
	]
}

I'll investigate

@ramonjd ramonjd force-pushed the update/style-engine-frontend-elements branch from 5a9c149 to 639ac0b Compare June 28, 2022 04:44
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ramonjd commented Jun 28, 2022

When testing this I noticed there is a difference in the handling of specificity of element styles between the editor and the frontend - seems to be the same on trunk as well though, so maybe out of the scope of this PR.

I rebased this branch and it seems okay to me now. Using the theme.json I used in the above comment, the styles.blocks.core/heading.elements.h2 styles overwrite the styles.elements.h2.

Screen Shot 2022-06-28 at 2 52 13 pm

ramonjd added 6 commits July 6, 2022 10:25
Migrate elements style generation to the style engine.
Split parsing of elements and other styles in hooks/style using style engine methods
Dismissing Styles Welcome Guide :D
Dismissing Styles Welcome Guide :D
Removing isEmpty
Cleaning up optional chaining
@ramonjd ramonjd force-pushed the update/style-engine-frontend-elements branch from 3d47f59 to bd5a4e2 Compare July 6, 2022 00:40
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@getdave getdave left a comment

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Late to the party. This looks good. I can see how we could extend this to support :hover.

packages/block-editor/src/hooks/style.js Outdated Show resolved Hide resolved
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This tested well for me, and the issue with root element and block element specificity seems to be resolved, ie. both editor and front end now apply these in the same order.

I tested with color setting for an h2 element setting in styles.element which displayed until it was overrriden by the setting of a different h2 element setting in styles.blocks.h2 and this displayed until overrriden by another h2 element setting in styles.blocks.column.

@ramonjd ramonjd merged commit 0fb5971 into trunk Jul 14, 2022
@ramonjd ramonjd deleted the update/style-engine-frontend-elements branch July 14, 2022 04:40
@github-actions github-actions bot added this to the Gutenberg 13.8 milestone Jul 14, 2022
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CSS Styling Related to editor and front end styles, CSS-specific issues. [Package] Style Engine /packages/style-engine [Type] Experimental Experimental feature or API.
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6 participants