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touch-action: scroll || scroll-x || scroll-y #211

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appsforartists opened this issue May 25, 2017 · 1 comment

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commented May 25, 2017

A common interaction pattern that is not well-addressed by the pointer events spec is overscroll; that is, trying to scroll beyond the bounds of a scroll pane. For instance, dragging a message in Inbox adjusts the scroll position until it's 0. Dragging further will begin a gesture to close the message (while leaving scroll position at 0). Another common example is pull-to-reload. These interactions aren't straightforward to achieve with the current spec.

Would it be possible to introduce a new touch-action mode and behaves like pan-{x,y} does now, except it sends pointer events for overscroll?

  • scrollY = 100
  • User places finger at { 200, 200 } and drags finger down by 110px
  • For the first 100px, scrolling happens normally. No pointer events are dispatched.
  • When the user scrolls past scrollY === 0, pointerdown is dispatched with { pageX: 200, pageY: 300 }
  • pointermove is dispatched every frame until the pointer is lifted.
  • pointerup is dispatched at { pageX: 200, pageY: 310 }
@NavidZ

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commented May 13, 2019

@appsforartists would overscroll/scrollend events here would solve the issue here? If so you might want to take a closer look and suggest any modifications there in these early stages.

@NavidZ NavidZ self-assigned this May 15, 2019

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