Try using a percentage based calculation for block drag scrolling velocity. #23448
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talldan
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[Type] Enhancement
6 tasks
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Size Change: +64 B (0%) Total Size: 1.13 MB
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Thank you for making this PR! The scroll while dragging enhancement is great, but it was definitely a little aggressive. This balances it out, way better. 👍 👍 |
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Nice! |
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Very nice improvement. Thanks! |
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gravityrail
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Jun 26, 2020
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| const dragDistance = Math.max( | ||
| offsetDragStartPosition - | ||
| offsetDragPosition - | ||
| SCROLL_INACTIVE_DISTANCE_PX, | ||
| 0 | ||
| ); | ||
| const distancePercentage = dragDistance / moveableDistance; |
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These lines appear to be duplicates of lines in the previous if-clause - is there a way to eliminate this duplication?
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Description
This tries an iteration on the behavior in #23082.
See also #23446 for an alternative.
It's based on the refactor to hooks in #23444, so the diff looks bigger than it is. That PR should ideally be merged first.
How does this differ from #23082
In #23082, when the user drags more than 50px the page starts scrolling in the direction they've dragged. The speed of the scrolling is based on how far the user drags.
Because the scroll speed is calculated using pixels, if the user starts dragging a block that's already near the top of the screen upwards there's a limit to the speed that the page can scroll. On the other hand, when dragging downwards from the top, very fast scroll speeds can be unexpectedly achieved due to the amount of space a user can drag into.
This PR makes the calculation percentage based. If the user drags to the top of the page the page scrolls at the same speed as if they dragged to the bottom, regardless of where they started dragging from.
How has this been tested?
Types of changes
Non-breaking enhancement
Checklist: