Lamartio

fun <T> ViewGroup.toAnkoViewHolder(createView: AnkoContext<ViewGroup>.(((T) -> Unit) -> Unit) -> View): AnkoViewHolder =
        AnkoViewHolder.create(this, createView)

class AnkoViewHolder(itemView: View, private val onBind: (Any) -> Unit) : RecyclerView.ViewHolder(itemView) {

    fun bind(item: Any) = onBind(item)

    companion object {

        @Suppress("UNCHECKED_CAST")

Lamartio

import android.app.Activity
import android.app.Instrumentation
import android.content.Context
import android.support.annotation.LayoutRes
import android.support.test.InstrumentationRegistry
import android.support.test.rule.ActivityTestRule
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup

Lamartio

private val Store<Car>.frontLeftWheel: Wheel
    get() = getState().wheels.entries.first { it.key == Position.FRONT_LEFT }.value

class ChangeWheelFeature : Feature({

    lateinit var store: Store<Car>

    given("the wheel is a 15 inch one") {

        setUp { store = newStore() }

Lamartio

LinearLayout(this).apply {

    orientation = LinearLayout.VERTICAL

    addView(TextView(context).apply {
        text = "Hello"
    })

    addView(TextView(context).apply {
        text = "click me"

Lamartio

LinearLayout(this).apply {

    orientation = LinearLayout.VERTICAL

    addView(TextView(context).apply {
        text = "Hello"
    })

    addView(TextView(context).apply {
        text = "click me"

Lamartio

LinearLayout(this) layout {
 // ...
}

infix fun <V : ViewGroup> V.layout(block: Layout<V>.() -> Unit): V =
        also { Layout(it).run(block) }

class Layout<V : ViewGroup>(val layout: V) : ViewManager by layout, ViewParent by layout {}

Lamartio

LinearLayout(this) layout {
    +TextView(context).apply {
        text = "Hello world"
    }
}

class Layout<V : ViewGroup>(val layout: V) : ViewManager by layout, ViewParent by layout {

    val context = layout.context

Lamartio

LinearLayout(this) layout {
    +TextView(context) {
        text = "Hello world"
    }
}

class Layout<V : ViewGroup>(val layout: V) : ViewManager by layout, ViewParent by layout {
    
    // ...

Lamartio

LinearLayout(this) layout {
    +textView {
        text = "Hello world"
    }
}

val Layout<*>.textView: TextView get() = TextView(context)
val Layout<*>.button: Button get() = Button(context)

Lamartio

LinearLayout(this) layout {
 // ...
}

infix fun <V : ViewGroup> V.layout(block: Layout<V>.() -> Unit): V =
        also { Layout(it).run(block) }

class Layout<V : ViewGroup>(val layout: V) : ViewManager by layout, ViewParent by layout {}