mapbox / mapbox/mapbox-maps-android

Using scrollable columns with ViewAnnotation (Compose)

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bug :beetle: ticketed
Dominant language
Kotlin
Stars
578
Forks
161
PR merge metrics
No merged PRs in 30d

Description

Environment

  • Android OS version: 16
  • Devices affected: all
  • Maps SDK Version: 11.9.2

Observed behavior and steps to reproduce

Add scrollable "Column" or "LazyColumn" to ViewAnnotation as content.
Map consume all columns scrolling events.

Expected behavior

ViewAnnotation with scrollable views inside work correctly like it is done on iOS.

Notes / preliminary analysis

Map consume all columns scrolling events.

Possible workaround:

 Box(
        modifier = modifier
            .width(mapBalloonWidth)
            .padding(marginVerySmall)
            .clickable(onClick = onDismiss)
            .pointerInput(Unit) {
                awaitPointerEventScope {
                    while (true) {
                        val event = awaitPointerEvent()
                        var verticalDelta = 0f
                        event.changes.forEach {
                            if (it.positionChanged()) {
                                verticalDelta += it.positionChange().y
                                it.consume()
                            }
                        }
                        if (verticalDelta != 0f) {
                            scrollScope.async {
                                scrollState.scrollBy(-verticalDelta)
                            }
                        }
                    }
                }
            },
        contentAlignment = Alignment.Center,
    ) {
        Column(modifier = Modifier.verticalScroll(state = scrollState))
}

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the issue with a scrollable Column or LazyColumn inside a Compose ViewAnnotation on Android 16 using Maps SDK 11.9.2, then compare the event handling with the provided pointerInput workaround. Done means scroll gestures inside the ViewAnnotation work correctly without the map consuming them, matching the stated iOS behavior.

Written by the indexing model from the issue text.

Assessment

Tech stack
android, kotlin
Domain
mobile
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
45/100

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