detecting touch

fun getRectIndexesFor(x: Float, y: Float): Pair<Int, Int> {
        squares.forEachIndexed {
            i, rects ->
            for ((j, rect) in rects.withIndex()) {
                if (rect.contains(x.toInt(), y.toInt()))
                    return Pair(i, j)
            }
        }
        return Pair(-1, -1) // x, y do not lie in our view
    }