[scroll-animations-1] question about progress calculation for a View Timeline

[ydaniv]

In Calculating Progress for a View Progress Timeline the spec says:

Progress (the current time) in a view progress timeline is calculated as: distance ÷ range where:

• distance is the current scroll offset minus the scroll offset corresponding to the start of the cover range

• range is the scroll offset corresponding to the start of the cover range minus the scroll offset corresponding to the end of the cover range

So I could be wrong here, but seems to me that instead of using cover for defining distance and range, it should be something like the "effective range" start/end including start/end inset, for the corresponding start/end definitions above.

Perhaps that "effective range" can be the attachment range?

FYI @fantasai @flackr

[flackr]

A view timeline can have many animations using it. We can't derive the range for the timeline from the ranges on the individual animations which may differ and change as animations start/stop.

[ydaniv]

ah, right. So animation attachment is out.

Nevertheless, shouldn't we include insets there? Since they are in fact properties of the timeline itself?