Marker drag event callback

[chibatching]

I want to get marker drag event callback and manipulate marker-related work.

So, Marker composable have to have dragging callback parameter like onMarkerDrag onMarkerDragStart onMarkerDragEnd similar with onClick and onInfoWindow~

It is an alternative to OnMarkerDragListener of Android view version.

[jpoehnelt]

@chibatching Thank you for opening this issue. 🙏
Please check out these other resources that might be applicable:

• Support Console - If you have a support contract.
• Discord - chat with other developers
• StackOverflow - use the google-maps tag
• Google Maps Platform issue trackers

This is an automated message, feel free to ignore.

[arriolac]

This is what MarkerDragState is for. You should be able to do the following:

val markerDragState = rememberMarkerDragState()

GoogleMap() {
    Marker(
        draggable = true,
        markerDragStae = markerDragState,
        // ...
    )
}
Text(text = "The marker drag state is $markerDragState.dragState")

Definitely open to reevaluate this although I think marker drag state should only be observed either using the State-based approach or the callback-based approach, not both. Please provide a bit more context if for some reason the latter works better for your use case.

[chibatching]

@arriolac
I have to know marker LatLng after drag to execute some process using the position after the move.
It is not enough to observe only the drag state.

My usecase is like below

var markerPoint by remember { mutableStateOf(defaultLatLng) }

GoogleMap() {
    Marker(
        position = markerPoint,
        draggable = true,
        onMarkerDragEnd = { marker ->
            markerPoint = maker.position
            viewModel.updateUserSelectedPosition(marker.position)
        },
    )
}

[chibatching]

I think it doesn't need to be a callback style if the drag state has marker object or position info.

[arriolac]

I think it doesn't need to be a callback style if the drag state has marker object or position info.

Yeah, this is what I'm thinking as well. There should be a Marker property in the MarkerDragState object. Will add that.

[chibatching]

I updated my PR #11 to add Marker property.
Would you check it?

[arriolac]

Please see my comment on #11 (comment) for how this feature should be implemented.