draggable2D

Draggable2DSample

@Composable
fun Draggable2DSample() {
    // Draw a box that has a a grey background
    // with a red square that moves along 300.dp dragging in both directions
    val max = 200.dp
    val min = 0.dp
    val (minPx, maxPx) = with(LocalDensity.current) { min.toPx() to max.toPx() }
    // this is the offset we will update while dragging
    var offsetPositionX by remember { mutableStateOf(0f) }
    var offsetPositionY by remember { mutableStateOf(0f) }
    Box(
        modifier =
            Modifier.width(max)
                .height(max)
                .draggable2D(
                    state =
                        rememberDraggable2DState { delta ->
                            val newValueX = offsetPositionX + delta.x
                            val newValueY = offsetPositionY + delta.y
                            offsetPositionX = newValueX.coerceIn(minPx, maxPx)
                            offsetPositionY = newValueY.coerceIn(minPx, maxPx)
                        }
                )
                .background(Color.LightGray)
    ) {
        Box(
            Modifier.offset {
                    IntOffset(offsetPositionX.roundToInt(), offsetPositionY.roundToInt())
                }
                .size(50.dp)
                .background(Color.Red)
        )
    }
}