问题
Based on this post throttleFirst
function:
fun <T> throttleFirst(
skipMs: Long = 700L,
scope: CoroutineScope = viewModelScope,
action: (T) -> Unit
): (T) -> Unit {
var throttleJob: Job? = null
return { param: T ->
if (throttleJob?.isCompleted != false) {
throttleJob = coroutineScope.launch {
destinationFunction(param)
delay(skipMs)
}
}
}
}
I'm using it like this:
View
<Button
android:onClick="@{viewModel.myClickListener}"
.../>
ViewModel:
fun myClickListener() = View.OnClickListener { _ ->
throttleClick(clickAction = {
//do things
})
}
BaseViewModel:
protected fun throttleClick(millis: Long = 700L, clickAction: (Unit) -> Unit): (Unit) -> Unit {
throttleFirst(millis, scope = viewModelScope, action = clickAction)
}
But nothing happens, the clickAction is not reached. While debugging, step-by-step ends when it hits return { param: T ->
and that returning function (throttleJob?.isCompleted
... code) is never called.
What am I doing wrong?
EDIT with the help from Patrick the final solution is:
ViewModel
private val myThrottleClick = throttleClick(clickAction = {
//do things
})
fun myClickListener() = View.OnClickListener { myThrottleClick(Unit) }
BaseViewModel
protected fun throttleClick(millis: Long = 700L, clickAction: (Unit) -> Unit): (Unit) -> Unit {
return throttleFirst(millis, action = clickAction)
}
回答1:
Your throttleFirst
function makes a click listener, so you must store it in a val outside of your click listeners scope. i.e.
val clickListener = throttleFirst { doStuff() }
fun myClickListener() = View.OnClickListener { _ -> clickListener() }
You may be able to do away with the myClickListener
function entirely and just reference clickListener
in xml.
来源:https://stackoverflow.com/questions/59413001/coroutine-doenst-start