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Block Selection Toolbar: Support fixed and sticky blocks by flipping when there is not enough space above the block #46565

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andrewserong
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@andrewserong andrewserong commented Dec 15, 2022

What?

Part of implementing: #30121

An alternative to #46085.

This PR explores whether we can add support for fixed and sticky blocks to the block selection toolbar by flipping the position of the toolbar to be beneath the block when there is not enough space to display the toolbar above the block.

Why?

Without this change, blocks that are included inside a sticky positioned block at the top of the screen are obscured by the block selection toolbar. By flipping to display beneath the block when there is not enough room, we can ensure that the block content is not obscured.

How?

I think that in most cases we should not be flipping the position of the toolbar if it's able to start out above the block.

Testing Instructions

To test the real world application for this PR, it might be easier to test #46142 instead, which includes the changes in this PR. However, you can still observe the changes in this PR with the following:

  1. In the editor, select a block that begins well below the top of the visible area of the editor canvas. The block toolbar should be visible above the block. If you scroll the page so the block goes off the top of the viewport, then the toolbar should be "sticky" to the top of the editor canvas.
  2. Select a block that is partially obscured at the top of the editor canvas. The block toolbar should be flipped and display beneath the block. As you scroll, the toolbar will flip between the top and bottom of the block. While this is a change from what's on trunk, it's this behaviour that ensures that for sticky and fixed position blocks, the toolbar will not obscure the content.

Screenshots or screencast

When a block is selected that does not have room for the toolbar initially (flips to bottom) When a block is selected that does have enough room (does not flip)
image image

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github-actions bot commented Dec 15, 2022

Size Change: +35 B (0%)

Total Size: 1.32 MB

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compressed-size-action

@talldan
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talldan commented Dec 19, 2022

In the block popover component, force a re-render whenever the scroll container for the editor canvas is scrolled. This forces the position of the popover to update when scrolling, which fixes positioning issues for fixed/sticky blocks.

I remember the popover used to have code that did this, but it was replaced with something else. This was the PR that added it - #41402, this is the one that removed it - #43617.

It'd be interesting to know a bit more about why it's needed again and why the change #43617 isn't sufficient.

Select a block that is partially obscured at the top of the editor canvas. The block toolbar should be flipped and display beneath the block. As you scroll, the toolbar will flip between the top and bottom of the block. While this is a change from what's on trunk, it's this behaviour that ensures that for sticky and fixed position blocks, the toolbar will not obscure the content.

I found it difficult to reproduce this part, I'm not sure I'm doing it right. 😄

@andrewserong andrewserong force-pushed the try/alternate-fix-for-block-toolbar-support-for-fixed-and-sticky-blocks branch from b7de65a to f892ec1 Compare January 4, 2023 05:12
@andrewserong andrewserong changed the title Block Selection Toolbar: Support fixed and sticky blocks by re-rendering on scroll Block Selection Toolbar: Support fixed and sticky blocks by flipping when there is not enough space above the block Jan 4, 2023
@andrewserong
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Thanks for testing and for the feedback @talldan!

After re-testing, it turns out that half of the changes in this PR were no longer required (the addition of the scroll event listener, etc) thanks to the improvements to the popover component that landed in #46187 — that PR seems to have resolved the issues of the block popover not staying attached to the sticky/fixed element once scrolled off the page.

The remaining changes are still needed for sticky / fixed position support — that is, flipping the toolbar to be displayed below the block when there is initially not enough room to display it above the block. I've updated the PR description to reflect this smaller-scoped change. I've also updated #46142 (the sticky position support PR) to reflect the current state of this PR. For anyone testing, it might be simpler to play around with #46142 since the new flipping behaviour might be more visible there.

@andrewserong
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I'll close out this PR now as its changed were merged as part of #46142

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