Dialog Helper with Kotlin

CustomDialog.kt

/**
 * Created by Soulduse on 2018. 1. 11..
 *
 * ex)
 *  CustomDialog(CustomDialog.Items().apply {
 *      this.context = context
 *      this.message = "message"
 *      this.positiveTitle = "ok"
 *      this.negativeTitle = "cancel"
 *  }).show({
 *      // do positive something 
 *  },{
 *      // do negative something 
 *  })
 */
 
class CustomDialog(private val items: Items) {

    fun show(positive: ()-> Unit, negative: (()-> Unit)?= null) = AlertDialog.Builder(items.context).apply {
                with(items){
                    setMessage(message)

                    setPositiveButton(positiveTitle, { _, _ ->
                        positive()

                    })

                    negative?.let{
                        setNegativeButton(negativeTitle, { dialog, _ ->
                            dialog.dismiss()
                            negative()
                        })
                    }
                }
            }.create().show()

    class Items {
        lateinit var context: Context

        lateinit var message: String

        lateinit var positiveTitle: String

        lateinit var negativeTitle: String
    }
}