ContourViewHolder.kt

class UserView(context: Context) : ContourLayout(context) {

    init {
        contourHeightOf { avatar.bottom() + 5.dip }
    }

    val name: TextView =
        TextView(context).apply {
            text = ""
            applyLayout(
                x = leftTo { avatar.right() + 5.dip }
                    .widthOf { parent.right() - 5.dip },
                y = topTo { avatar.top() + 5.dip }
            )
        }

    val avatar =
        CircularImageView(context).apply {
            scaleType = ImageView.ScaleType.CENTER_CROP
            applyLayout(
                x = leftTo { parent.left() + 5.dip }.widthOf {
                    context.resources.getDimensionPixelSize(R.dimen.avatar_size).toXInt()
                },
                y = topTo { parent.top() + 5.dip }.heightOf {
                    context.resources.getDimensionPixelSize(R.dimen.avatar_size).toYInt()
                }
            )
        }

}

/**
 * CardView {
 *   UserView {
 *     ImageView {}
 *     TextView {}
 *   }
 * }
 */
class UserCardView(context: Context) : ContourLayout(context) {
    init {
        contourHeightOf { cardView.bottom() + 10.dip }
    }

    private val cardView: CardView = CardView(context)
    val userView: UserView = UserView(context).also {
        cardView.apply {
            addView(it)
            radius = context.resources.getDimension(R.dimen.avatar_radius_dimen)
            applyLayout(
                x = leftTo { parent.left() + 5.dip}
                    .rightTo { parent.right() - 5.dip },
                y = topTo { parent.top() + 5.dip }
            )
        }
    }
}

abstract class BindViewHolder<T>(itemView: View) : ViewHolder(itemView) {
    abstract fun bind(user: T?)
}

abstract class TypedViewHolder<T, V : View>(context: Context, val view: V)
    : BindViewHolder<T>(
    LinearLayout(context).apply {
        layoutParams = RecyclerView.LayoutParams(
            RecyclerView.LayoutParams.MATCH_PARENT, RecyclerView.LayoutParams.WRAP_CONTENT)
        addView(view)
    }
)

class UserViewHolder(context: Context, view: UserCardView) : TypedViewHolder<User, UserCardView>(context, view) {
    override fun bind(user: User?) {
        user?.avatarUrl?.let {
            view.userView.avatar.url(it)
        }
        view.userView.name.text = user?.name ?: user?.login ?: ""
    }
}

/// TODO: Move to util/PicassoKtx
fun ImageView.url(url: String) {
    Picasso.get()
        .load(url)
        .into(this)
}