IssueTracker

Thanks! This looks like a bug, thank you for reporting!

The following release(s) address this bug.It is possible this bug has only been partially addressed:

• androidx.compose.foundation:foundation:1.8.0-alpha04
• androidx.compose.foundation:foundation-android:1.8.0-alpha04
• androidx.compose.foundation:foundation-jvmstubs:1.8.0-alpha04

Using the new version 1.8.0-alpha04 does not seem to resolve the issue for me. I tested with the same setting as the reported issue:

            // it doesn't matter what you put here a the multiplier, the positionalThreshold is always 50%
            positionalThreshold = { d -> d * 0.9f },
            velocityThreshold = { Float.POSITIVE_INFINITY },

Same. I've run this again on 1.8.0-alpha04. When using

positionalThreshold = { d -> d * 0.1f }

Dragging up to 10% or between 50% and 90% will cause it to snap back to the start anchor. Dragging between 10% and 50% or past 90% will cause it to snap to the end anchor.

I would expect It to only return if dragged less than or equal to 10% and snap to the end if dragged greater than 10%.

When using

positionalThreshold = { d -> d * 0.9f }

It acts as if the threshold has been set to 50%.

From what I can tell, nothing has changed about the behavior.

Thanks, we will investigate and update this issue.

Project: platform/frameworks/support
Branch: androidx-main
Author: Jossi Wolf <jossiwolf@google.com>
Link:      https://android-review.googlesource.com/3343747

Update AnchoredDraggable target calculation logic

Update AnchoredDraggable target calculation logic 
 
There was a missed case when the velocity was negative. 
 
Test: New tests with more parameter permutations 
Fixes: 367660226 
Bug: 376931805 
Relnote: "Follow-up fix for an issue in AnchoredDraggable's target calculation where it could settle at the wrong anchor for specific swipes." 
Change-Id: I23b8773d3a694aa3c8de6a8f34b9d7fb54cfe560

What is the fix version?

We will comment on the issue when it has been included in a release. Until then, you can try the snapshot versions from androidx.dev.

The following release(s) address this bug.It is possible this bug has only been partially addressed:

• androidx.compose.foundation:foundation:1.8.0-alpha07
• androidx.compose.foundation:foundation-android:1.8.0-alpha07
• androidx.compose.foundation:foundation-jvmstubs:1.8.0-alpha07
• androidx.compose.foundation:foundation-linuxx64stubs:1.8.0-alpha07

#15, please report a new issue with a full reproduction case and the versions you are using. Thank you!

Running compose foundation 1.8.0-alpha07

I'm using AnchoredDraggable with nested scrolling. When I drag and release the lazy layout sometimes the draggable settles correctly and sometimes it doesn't even when i drag and release past the threshold (positionalThreshold = { distance -> distance / 2f }.

    internal fun nestedScrollConnection(
        dragState: AnchoredDraggableState<Anchors>,
        decayAnimationSpec: DecayAnimationSpec<Float>,
        orientation: Orientation = Orientation.Vertical,
    ): NestedScrollConnection = object : NestedScrollConnection {

        override fun onPreScroll(
            available: Offset,
            source: NestedScrollSource,
        ): Offset {
            val availableDelta = available.toFloat()

            return if (
                availableDelta < 0f
            ) dragState.dispatchRawDelta(availableDelta).toOffset()
            else Offset.Zero
        }

        override fun onPostScroll(
            consumed: Offset,
            available: Offset,
            source: NestedScrollSource,
        ): Offset {
            val availableDelta = available.toFloat()

            return if (
                availableDelta >= 0f
            ) dragState.dispatchRawDelta(availableDelta).toOffset()
            else Offset.Zero
        }

        override suspend fun onPreFling(
            available: Velocity,
        ): Velocity {
            val availableDelta = available.toFloat()

            val consumedOffset = if (availableDelta < 0f) dragState.animateToWithDecay(
                velocity = availableDelta,
                targetValue = Anchors.Collapsed,
                decayAnimationSpec = decayAnimationSpec,
            ) else 0f

            return Velocity(
                x = 0f,
                y = consumedOffset,
            )
        }

        override suspend fun onPostFling(
            consumed: Velocity,
            available: Velocity,
        ): Velocity {
            val availableDelta = available.toFloat()

            if (
                availableDelta > 0f
            ) dragState.animateToWithDecay(
                velocity = availableDelta,
                targetValue = Anchors.Expanded,
                decayAnimationSpec = decayAnimationSpec,
            )

            dragState.settle(animationSpec = spring())

            return Velocity(x = 0f, y = availableDelta)
        }

        private fun Float.toOffset(): Offset = Offset(
            y = if (orientation == Orientation.Vertical) this else 0f,
            x = if (orientation == Orientation.Horizontal) this else 0f,
        )

        @JvmName("offsetToFloat")
        private fun Offset.toFloat() = if (orientation == Orientation.Horizontal) x else y

        @JvmName("velocityToFloat")
        private fun Velocity.toFloat() = if (orientation == Orientation.Horizontal) x else y
    }

Hi, this seems to be a different issue. Please provide a full reproducer in a new issue so we can investigate. Thank you!