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Coroutine scope for View
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| val View.viewScope: CoroutineScope | |
| get() { | |
| val storedScope = getTag(R.string.view_coroutine_scope) as? CoroutineScope | |
| if (storedScope != null) return storedScope | |
| val newScope = ViewCoroutineScope() | |
| if (isAttachedToWindow) { | |
| addOnAttachStateChangeListener(newScope) | |
| setTag(R.string.view_coroutine_scope, newScope) | |
| } else newScope.cancel() | |
| return newScope | |
| } | |
| private class ViewCoroutineScope : CoroutineScope, View.OnAttachStateChangeListener { | |
| override val coroutineContext = SupervisorJob() + Dispatchers.Main | |
| override fun onViewAttachedToWindow(view: View) = Unit | |
| override fun onViewDetachedFromWindow(view: View) { | |
| coroutineContext.cancel() | |
| view.setTag(R.string.view_coroutine_scope, null) | |
| } | |
| } |
Why would I?
why no removeOnAttachStateChangeListener
Hey @MiSikora I think it would be effective to invoke removeOnAttachStateChangeListener like in the following code:
val View.viewScope: CoroutineScope
get() {
val storedScope = getTag(R.string.view_coroutine_scope) as? ViewCoroutineScope
if (storedScope != null) {
if (storedScope.isActive && isAttachedToWindow) {
return storedScope
} else {
this.removeOnAttachStateChangeListener(storedScope)
}
}
val newScope = ViewCoroutineScope()
if (isAttachedToWindow) {
setTag(R.string.view_coroutine_scope, newScope)
this.addOnAttachStateChangeListener(newScope)
} else {
newScope.cancel()
}
return newScope
}
What do you think?
What's the point?
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why no removeOnAttachStateChangeListener