SPIN TO SCROLL
WHAT
The user moves a single digit (typically a thumb or index finger) in a circular motion to scroll. Usually, a clockwise gesture scrolls down/forward/right and a counterclockwise gesture scrolls up/backward/left.
USE WHEN
Use Spin to Scroll when there is a list of items (such as menu or search results) or a set of screens (more than three) through which to rapidly scroll.
Spin to Scroll generally appears on mobile devices, where there is a lot of information to scroll through but limited screen real estate in which to display the information. It can also be done using trackpads.
WHY
Spin to Scroll allows for rapid scrolling with a motion that is more continuous and smoother than up and down or side to side (see Slide to Scroll and Two Fingers to Scroll).
HOW
A slight movement in one direction in a circle starts to scroll left/right or up/down. A full circle can scroll through a full screen of items. A speed or time-scrolling threshold can also be set so that after it is reached, the scrolling speeds up. Care should be taken, as rapid scrolling can be difficult for users to follow. For this reason, it is best if the user understands the structure of the list (e.g., that it is in alphabetical order).
It can also be difficult for precisely stopping on an item, often requiring users to go back and forth to pinpoint the item they want. Visual and even auditory feedback can be of assistance here.
Scroll bars indicating position can also be helpful, either always visible or appearing ...
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