العمل مع طريقة العرض بشكل غير متزامن باستخدام coroutine

inline fun <T> View.doAsync(
        crossinline backgroundTask: (scope: CoroutineScope) -> T, 
        crossinline result: (T?) -> Unit) {
    val job = CoroutineScope(Dispatchers.Main)
    //  ,    
    // ,   
    val attachListener = object : View.OnAttachStateChangeListener {
        override fun onViewAttachedToWindow(p0: View?) {}
        override fun onViewDetachedFromWindow(p0: View?) {
            job.cancel()
            removeOnAttachStateChangeListener(this)
        }
    }
    this.addOnAttachStateChangeListener(attachListener)
    //  Job,      
    job.launch {
        //  Deferred     
        val data = async(Dispatchers.Default) {
            try {
                backgroundTask(this)
            } catch (e: Exception) {
                e.printStackTrace()
                return@async null
            }
        }
        if (isActive) {
            try {
                result.invoke(data.await())
            } catch (e: Exception) {
                e.printStackTrace()
            }
        }
        //     Job
        this@doAsync.removeOnAttachStateChangeListener(attachListener)
    }
}

inner class PostHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
    private val ivTest = itemView.iv_test
    fun bind() {
        val bitmap = ... 
        val blurBitmap = bitmap?.addBlurShadow(Color.CYAN, 50.dp, 50.dp)
        ivTest.setImageBitmap(blurBitmap)
    }
}

inner class PostHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
    private val ivTest = itemView.iv_test
    fun bind() {
        val bitmap = ... 
        itemView.doAsync({ scope -> 
            //        
            return@doAsync bitmap?.addBlurShadow(Color.CYAN, 50.dp, 50.dp)
        }, { it ->
            //            
            ivTest.setImageBitmap(it)
        })
    }
}

itemView.doAsync({ scope ->
    logInfo("coroutine start")
    var x = 0
    //        scope.isActive
    //       isActive = true,     
    //    ,     
    while (x < 100 && scope.isActive) {
        TimeUnit.MILLISECONDS.sleep(100)
        logInfo("coroutine, position: $adapterPosition ${x++}")
    }
    logInfo("coroutine end")
}, {
    logInfo("coroutine DONE")
})