/
SnackbarShown.kt
119 lines (111 loc) · 3.39 KB
/
SnackbarShown.kt
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/*
* Copyright 2019 Vladimir Raupov
*
* 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 ru.ldralighieri.corbind.material
import androidx.annotation.CheckResult
import com.google.android.material.snackbar.Snackbar
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.channels.Channel
import kotlinx.coroutines.channels.ReceiveChannel
import kotlinx.coroutines.channels.actor
import kotlinx.coroutines.channels.awaitClose
import kotlinx.coroutines.coroutineScope
import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.flow.channelFlow
import kotlinx.coroutines.isActive
import ru.ldralighieri.corbind.internal.corbindReceiveChannel
/**
* Perform an action on the show events from [Snackbar].
*
* @param scope Root coroutine scope
* @param capacity Capacity of the channel's buffer (no buffer by default)
* @param action An action to perform
*/
fun Snackbar.shown(
scope: CoroutineScope,
capacity: Int = Channel.RENDEZVOUS,
action: suspend (Snackbar) -> Unit,
) {
val events = scope.actor<Snackbar>(Dispatchers.Main.immediate, capacity) {
for (snackbar in channel) action(snackbar)
}
val callback = callback(scope, events::trySend)
addCallback(callback)
events.invokeOnClose { removeCallback(callback) }
}
/**
* Perform an action on the show events from [Snackbar], inside new [CoroutineScope].
*
* @param capacity Capacity of the channel's buffer (no buffer by default)
* @param action An action to perform
*/
suspend fun Snackbar.shown(
capacity: Int = Channel.RENDEZVOUS,
action: suspend (Snackbar) -> Unit,
) = coroutineScope {
shown(this, capacity, action)
}
/**
* Create a channel which emits the show events from [Snackbar].
*
* Example:
*
* ```
* launch {
* snackbar.shown(scope)
* .consumeEach { /* handle show */ }
* }
* ```
*
* @param scope Root coroutine scope
* @param capacity Capacity of the channel's buffer (no buffer by default)
*/
@CheckResult
fun Snackbar.shown(
scope: CoroutineScope,
capacity: Int = Channel.RENDEZVOUS,
): ReceiveChannel<Snackbar> = corbindReceiveChannel(capacity) {
val callback = callback(scope, ::trySend)
addCallback(callback)
invokeOnClose { removeCallback(callback) }
}
/**
* Create a flow which emits the show events from [Snackbar].
*
* Example:
*
* ```
* snackbar.shown()
* .onEach { /* handle show */ }
* .flowWithLifecycle(lifecycle)
* .launchIn(lifecycleScope) // lifecycle-runtime-ktx
* ```
*/
@CheckResult
fun Snackbar.shown(): Flow<Snackbar> = channelFlow {
val callback = callback(this, ::trySend)
addCallback(callback)
awaitClose { removeCallback(callback) }
}
@CheckResult
private fun callback(
scope: CoroutineScope,
emitter: (Snackbar) -> Unit,
) = object : Snackbar.Callback() {
override fun onShown(sb: Snackbar) {
if (scope.isActive) emitter(sb)
}
}