Comments (3)
@ichenhe thanks for your feedback and proposal. That request makes total sense. We're working on bringing rotary support by default to Compose for WearOS in AndroidX, so this will be very useful.
What we have to do is to align this api with similar apis regarding nested scroll support.
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Cc @Kpeved in case you have thoughts
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@Kpeved Here's my basic idea:
To support nested scrolling, we must implement the following:
- Know the scrolling axis that can not be infered from the
ScrollableState
. - Have a
NestedScrollDispatcher
to dispatch the event.
Parameter
A parameter can be introduced to allow developer to specify the scroll axis and to provide their own NestedScrollDispatcher
if needed.
Example
data class NestedScrollOptions (
val axis: NestedScrollAxis,
val dispatcher: NestedScrollDispatcher = NestedScrollDispatcher()
)
// public api
public fun Modifier.rotaryWithScroll(
scrollableState: ScrollableState,
nestedScrollOptions: NestedScrollOptions? = null,
// others...
)
Dispatch
-
Make
RotaryInputNode
extendDelegatingNode
and register a delegate node:nestedScrollModifierNode()
. TheNestedScrollConnection
here is meaningless so an empty implementation can be used.Example
private class RotaryInputNode( var rotaryScrollHandler: RotaryScrollHandler, var nestedScrollDispatcher: NestedScrollDispatcher, ) : RotaryInputModifierNode, DelegatingNode() { init { val conn = object : NestedScrollConnection {} delegate(nestedScrollModifierNode(conn, dispatcher = nestedScrollDispatcher)) } }
-
Modify the
RotaryScrollBehavior
to dispatch nested scroll event.Example
// RotaryScrollBehavior suspend fun handleEvent(targetValue: Float) { scrollAnimation.animateTo() { var consumed = dispatcher.dispatchPreScroll(Offset(0f, delta), NestedScrollSource.Wheel).y consumed += scrollBy(delta - consumed) dispatcher.dispatchPostScroll( Offset(0f, consumed), Offset(0f, delta - consumed), NestedScrollSource.Wheel ) } }
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