CODEWITHSUNDEEP
kotlinanko
Dave Chambers
Dave Chambers

Reputation: 2563

How can I adapt my Kotlin Higher-Order function to take a parameter?

In Kotlin I have the following:

fun ViewManager.controlButton(body: () -> Unit) = frameLayout {
...
}

private fun captureAndInsert() {
    println("captureAndInsert is called!")
}

Inside an Anko view:

controlButton(this@MemoryFragmentUi::captureAndInsert)

This works fine.

Now I need to pass a parameter to captureAndInsert so it will look like this:

private fun captureAndInsert(myInt: Int) {
    println("captureAndInsert is called!")
}

How can I adapt ViewManager.controlButton and the call inside the Anko view to accept the parameter?

EDIT:

Ok, so I can do this:

fun ViewManager.controlButton(body: (myInt: Int) -> Unit) = frameLayout {
...
}

But how do I call that from the Anko view?

Upvotes: 0

Views: 88

Answers (1)

s1m0nw1
s1m0nw1

Reputation: 81939

To accept an (Int) -> Unit function, you simply need to add the Int parameter to the function type in controlButton parameter:

fun ViewManager.controlButton(body: (Int) -> Unit) = frameLayout {
    ...
}

The call of body happens inside controlButton, so you also need to pass the argument for the lambda to the parameter list of controlButton:

fun ViewManager.controlButton(body: (Int) -> Unit, v: Int) = frameLayout {
    body(v)
}

//call
controlButton(this@MemoryFragmentUi::captureAndInsert, 5)

Upvotes: 2

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