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LiveDataExtensions.kt
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LiveDataExtensions.kt
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/*
* Copyright 2017 Google LLC
*
* 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 app.tivi.extensions
import androidx.lifecycle.LifecycleOwner
import androidx.lifecycle.LiveData
import androidx.lifecycle.Observer
import kotlinx.coroutines.channels.awaitClose
import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.flow.channelFlow
inline fun <T> LiveData<T>.observeK(owner: LifecycleOwner, crossinline observer: (T?) -> Unit) {
this.observe(owner, Observer { observer(it) })
}
inline fun <T> LiveData<T>.observeNotNull(
owner: LifecycleOwner,
crossinline observer: (T) -> Unit
) {
this.observe(owner, Observer { it?.run(observer) })
}
fun <T> LiveData<T>.asFlow(): Flow<T> {
return channelFlow {
value?.also { send(it) }
val observer = Observer<T> { v -> offer(v) }
observeForever(observer)
awaitClose {
removeObserver(observer)
}
}
}