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Cover: Alternate approach to handling border support in editor #40774

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@aaronrobertshaw aaronrobertshaw commented May 3, 2022

Related:

The use of ResizableBox within the Cover block wrapper causes problems when the wrapper may have a border applied to it. Additionally, clipping the content via overflow: hidden also cuts off the drag handle. The approach in this commit attempts to avoid these.

What?

Adds border support to the Cover block via an alternate approach to those explored in #31370.

Why?

This alternate approach is necessary to improve the behaviour of how the Cover block behaves in the editor when borders are applied.

Within the editor the Cover block introduces a ResizableBox component so that the Cover block can be resized via drag handles. This ResizableBox causes the block to not behave well in the editor. If not for this, the block would only need a simple block.json change.

How?

  • Opts into all border support but skips serialization
  • In the editor only, introduces another inner element to wrap the background, image, or, video elements
  • On the new wrapping element, it applies the border support styles
  • Editor only CSS changes were made to re-establish the internal layout within the Cover block and inherit padding from theme.json or border support.
  • Adds overflow: hidden to the frontend CSS so cover background honors any border radius
  • Updates Cover save such that it applies border support as if serialization wasn't skipped

Drawbacks

  • ⚠️ Theme.json application of borders won't apply cleanly in the editor. ⚠️

There are other blocks where the block support doesn't play well with the theme.json generated styles. I believe buttons and search blocks are examples of this. Given the importance of the Cover block I'm not convinced that we want that here as well.

Testing Instructions

  1. Checkout branch, create post and add a cover block
  2. Try various configurations of borders
  3. Resize the block's min-height via sidebar control and drag handles
  4. Ensure duotone filter and content positioning still work
  5. Try applying styles via theme.json or global styles (won't work).

Screenshots or screencast

Screen.Recording.2022-05-03.at.3.10.05.pm.mp4

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Size Change: +729 B (0%)

Total Size: 1.24 MB

Filename Size Change
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Filename Size
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compressed-size-action

The use of ResizableBox within the Cover block wrapper causes problems when the wrapper may have a border applied to it. Additionally, clipping the content via overflow: hidden also cuts off the drag handle. The approach in this commit attempts to avoid these.
@aaronrobertshaw
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Closing this in favour of #41153 as it is more likely to land.

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