Coroutine Scope for a view.

ViewCoroutineScope

import android.view.View
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.SupervisorJob
import kotlinx.coroutines.cancelChildren
import kotlin.coroutines.CoroutineContext

internal val View.viewScope: ViewCoroutineScope
    get() {
        val scope = getTag(R.id.coroutineScope) as ViewCoroutineScope?
        if (scope != null) {
            return scope
        }
        val newScope = ViewCoroutineScope(this, SupervisorJob() + Dispatchers.Main.immediate)
        setTag(R.id.coroutineScope, newScope)
        return newScope
    }

internal class ViewCoroutineScope(view: View, override val coroutineContext: CoroutineContext) : CoroutineScope {
    init {
        view.addOnAttachStateChangeListener(object : View.OnAttachStateChangeListener {
            override fun onViewAttachedToWindow(v: View?) {
                // Do nothing
            }

            override fun onViewDetachedFromWindow(v: View?) {
                coroutineContext.cancelChildren()
            }

        })
    }
}