FragmentResultOwner.kt
/*
* Copyright 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.fragment.app
import android.os.Bundle
import androidx.lifecycle.LifecycleOwner
/**
* Sets the [FragmentResultListener] for a given requestKey. Once the given [LifecycleOwner] is
* at least in the [androidx.lifecycle.Lifecycle.State.STARTED] state, any results set by
* [FragmentResultOwner.setFragmentResult] using the same requestKey will be delivered to the
* [FragmentResultListener.onFragmentResult] callback. The callback will remain active until the
* LifecycleOwner reaches the [androidx.lifecycle.Lifecycle.State.DESTROYED] state or a null
* [FragmentResultListener] is set for the same requestKey.
*
* @param requestKey requestKey used to store the result
* @param lifecycleOwner lifecycleOwner for handling the result
* @param listener listener for result changes or `null` to remove any previously registered
* listener.
*/
fun FragmentResultOwner.setFragmentResultListener(
requestKey: String,
lifecycleOwner: LifecycleOwner,
listener: ((resultKey: String, bundle: Bundle) -> Unit)?
) {
val resultListener = if (listener == null) null else FragmentResultListener(listener)
setFragmentResultListener(requestKey, lifecycleOwner, resultListener)
}