Migrate composed 1

migrate-composed-modifier-1.kt

private fun Modifier.curve(
    fillColor: Color,
    lineColor: Color,
    backgroundColor: Color,
    stroke: Stroke,
    points: SnapshotStateList<Point>,
    thumbSize: Dp
) = this then CurveModifier(
    fillColor = fillColor,
    lineColor = lineColor,
    backgroundColor = backgroundColor,
    stroke = stroke,
    points = points
)

@Immutable
private data class CurveModifier(
    private val fillColor: Color,
    private val lineColor: Color,
    private val backgroundColor: Color,
    private val stroke: Stroke,
    private val points: SnapshotStateList<Point>
) : ModifierNodeElement<CurveNode>() {
    override fun InspectorInfo.inspectableProperties() {
        debugInspectorInfo {
            properties["fillColor"] = fillColor
            properties["lineColor"] = lineColor
            properties["points"] = points.joinToString()
            properties["stroke"] = stroke
        }

    }

    override fun create() = CurveNode(
        fillColor = fillColor,
        lineColor = lineColor,
        backgroundColor = backgroundColor,
        stroke = stroke,
        points = points
    )

    override fun update(node: CurveNode) {
        node.fillColor = fillColor
        node.lineColor = lineColor
        node.backgroundColor = backgroundColor
        node.stroke = stroke
        node.points = points
    }
}

private class CurveNode(
    var fillColor: Color,
    var lineColor: Color,
    var backgroundColor: Color,
    var stroke: Stroke,
    var points: SnapshotStateList<Point>
) : DrawModifierNode, Modifier.Node() {
    private val path = Path() // <--- remembered 
    override fun ContentDrawScope.draw() {
        if (!path.isEmpty) {
            path.reset()
        }

        path.drawSomething(
            stroke = stroke, size = size, points = points.toList()
        )
        drawPath(path = path, color = lineColor, style = stroke)
        drawPath(path = path, color = fillColor, alpha = 0.4f)


        drawContent()
    }