brescia123

import android.app.Activity
import android.content.Intent
import android.os.Bundle
import android.support.v7.app.AppCompatActivity

abstract class CompositionActivity : AppCompatActivity() {

    private val onCreateFeatures = mutableListOf<CompositionActivity.OnCreateFeature>()
    private val onStartFeatures = mutableListOf<CompositionActivity.OnStartFeature>()
    private val onResumeFeatures = mutableListOf<CompositionActivity.OnResumeFeature>()

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@ColorInt fun Context.color(@ColorRes id: Int, theme: Resources.Theme? = getTheme()): Int =
        if (Build.VERSION.SDK_INT >= 23) 
            resources.getColor(id, theme) 
        else 
            resources.getColor(id)

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fun View.createSnackbar(text: String,
                        duration: Int = Snackbar.LENGTH_SHORT,
                        actionLabel: String = "Action",
                        dismissOnAction: Boolean = true,
                        action: ((View) -> Unit)? = null): Snackbar {

    val snackbar = Snackbar.make(this, text, duration)
    action?.let {
        snackbar.setAction(actionLabel, {
            action(it)

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/** Set the View visibility to VISIBLE and eventually animate the View alpha till 100% */
fun View.visible(animate: Boolean = true) {
    if (animate) {
        animate().alpha(1f).setDuration(300).setListener(object : AnimatorListenerAdapter() {
            override fun onAnimationStart(animation: Animator) {
                super.onAnimationStart(animation)
                visibility = View.VISIBLE
            }
        })
    } else {