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Improve "Scroll lock" scrollbar width for Dialog component #1457

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merged 2 commits into from May 16, 2022

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RobinMalfait
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@RobinMalfait RobinMalfait commented May 16, 2022

The idea is as follow:
If you currently have a scrollbar, and you open a Dialog then we enable a "Scroll lock" so that you can't scroll in the background behind the modal. We can achieve this by adding a overflow: hidden; to the html.

The issue is that by doing this, we lose the scrollbar and therefore the page will jump to right because now there is a bit more room.

To account for this, we set a padding-right on the html of the scrollbarWidth in pixels. This counteracts the visual jump you would see.

The issue with this approach is that there could still be a scrollbar once we add the overflow: hidden. This can happen if you use new css features like the scrollbar-gutter: stable;.

To take this into account, we will measure the scrollbar again after we set the overflow: hidden. Now we will only apply that counteracting offset if there would actually be a jump by measuring the before and after widths and applying the diff if there is one.

Fixes: #1436

The idea is as follow:
If you currently have a scrollbar, and you open a Dialog then we enable
a "Scroll lock" so that you can't scroll in the background behind the
modal. We can achieve this by adding a `overflow: hidden;` to the
`html`.

The issue is that by doing this, we lose the scrollbar and therefore the
page will jump to right because now there is a bit more room.

To account for this, we set a `padding-right` on the `html` of the
scrollbarWidth in pixels. This counteracts the visual jump you would
see.

The issue with this approach is that there could *still* be a scrollbar
once we add the `overflow: hidden`. This can happen if you use new css
features like the `scrollbar-gutter: stable;`.

To take this into account, we will measure the scrollbar again after we
set the `overflow: hidden`. Now we will only apply that counteracting
offset if there would actually be a jump by measuring the before and
after widths and applying the diff if there is one.
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@simirka
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simirka commented Aug 31, 2022

@RobinMalfait If you have fixed the Header you still see the jumps of the UI because padding should be added to the body instead of the HTML tag. I think there should be a possibility to switch between these tags.

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Successfully merging this pull request may close these issues.

Opening or closing Dialogs with scrollbar-gutter: stable results in underlying page shifts
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