/
SeekBarChangeEvents.kt
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/
SeekBarChangeEvents.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.widget
import android.widget.SeekBar
import androidx.annotation.CheckResult
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.channelFlow
import kotlinx.coroutines.isActive
import ru.ldralighieri.corbind.internal.InitialValueFlow
import ru.ldralighieri.corbind.internal.asInitialValueFlow
import ru.ldralighieri.corbind.internal.corbindReceiveChannel
sealed interface SeekBarChangeEvent {
val view: SeekBar
}
data class SeekBarProgressChangeEvent(
override val view: SeekBar,
val progress: Int,
val fromUser: Boolean,
) : SeekBarChangeEvent
data class SeekBarStartChangeEvent(
override val view: SeekBar,
) : SeekBarChangeEvent
data class SeekBarStopChangeEvent(
override val view: SeekBar,
) : SeekBarChangeEvent
/**
* Perform an action on [change events][SeekBarChangeEvent] for [SeekBar].
*
* *Warning:* The created actor uses [SeekBar.setOnSeekBarChangeListener]. Only one actor can be
* used at a time.
*
* @param scope Root coroutine scope
* @param capacity Capacity of the channel's buffer (no buffer by default)
* @param action An action to perform
*/
fun SeekBar.changeEvents(
scope: CoroutineScope,
capacity: Int = Channel.RENDEZVOUS,
action: suspend (SeekBarChangeEvent) -> Unit,
) {
val events = scope.actor<SeekBarChangeEvent>(Dispatchers.Main.immediate, capacity) {
for (event in channel) action(event)
}
events.trySend(initialValue(this))
setOnSeekBarChangeListener(listener(scope, events::trySend))
events.invokeOnClose { setOnSeekBarChangeListener(null) }
}
/**
* Perform an action on [change events][SeekBarChangeEvent] for [SeekBar], inside new
* [CoroutineScope].
*
* *Warning:* The created actor uses [SeekBar.setOnSeekBarChangeListener]. Only one actor can be
* used at a time.
*
* @param capacity Capacity of the channel's buffer (no buffer by default)
* @param action An action to perform
*/
suspend fun SeekBar.changeEvents(
capacity: Int = Channel.RENDEZVOUS,
action: suspend (SeekBarChangeEvent) -> Unit,
) = coroutineScope {
changeEvents(this, capacity, action)
}
/**
* Create a channel of [change events][SeekBarChangeEvent] for [SeekBar].
*
* *Warning:* The created channel uses [SeekBar.setOnSeekBarChangeListener]. Only one channel can be
* used at a time.
*
* *Note:* A value will be emitted immediately.
*
* Examples:
*
* ```
* // handle all events
* launch {
* seekBar.changeEvents(scope)
* .consumeEach { event ->
* when (event) {
* is SeekBarProgressChangeEvent -> { /* handle progress change event */ }
* is SeekBarStartChangeEvent -> { /* handle start change event */ }
* is SeekBarStopChangeEvent -> { /* handle stop change event */ }
* }
* }
* }
*
* // handle one event
* launch {
* seekBar.changeEvents(scope)
* .filterIsInstance<SeekBarProgressChangeEvent>()
* .consumeEach { /* handle progress change event */ }
* }
* ```
*
* @param scope Root coroutine scope
* @param capacity Capacity of the channel's buffer (no buffer by default)
*/
@CheckResult
fun SeekBar.changeEvents(
scope: CoroutineScope,
capacity: Int = Channel.RENDEZVOUS,
): ReceiveChannel<SeekBarChangeEvent> = corbindReceiveChannel(capacity) {
trySend(initialValue(this@changeEvents))
setOnSeekBarChangeListener(listener(scope, ::trySend))
invokeOnClose { setOnSeekBarChangeListener(null) }
}
/**
* Create a flow of [change events][SeekBarChangeEvent] for [SeekBar].
*
* *Warning:* The created flow uses [SeekBar.setOnSeekBarChangeListener]. Only one flow can be used
* at a time.
*
* *Note:* A value will be emitted immediately.
*
* Examples:
*
* ```
* // handle all events
* seekBar.changeEvents()
* .onEach { event ->
* when (event) {
* is SeekBarProgressChangeEvent -> { /* handle progress change event */ }
* is SeekBarStartChangeEvent -> { /* handle start change event */ }
* is SeekBarStopChangeEvent -> { /* handle stop change event */ }
* }
* }
* .flowWithLifecycle(lifecycle)
* .launchIn(lifecycleScope) // lifecycle-runtime-ktx
*
* // handle one event
* seekBar.changeEvents()
* .filterIsInstance<SeekBarProgressChangeEvent>()
* .onEach { /* handle progress change event */ }
* .flowWithLifecycle(lifecycle)
* .launchIn(lifecycleScope) // lifecycle-runtime-ktx
*
* // drop one event
* seekBar.changeEvents()
* .dropInitialValue()
* .onEach { /* handle event */ }
* .flowWithLifecycle(lifecycle)
* .launchIn(lifecycleScope) // lifecycle-runtime-ktx
* ```
*/
@CheckResult
fun SeekBar.changeEvents(): InitialValueFlow<SeekBarChangeEvent> = channelFlow {
setOnSeekBarChangeListener(listener(this, ::trySend))
awaitClose { setOnSeekBarChangeListener(null) }
}.asInitialValueFlow(initialValue(seekBar = this))
@CheckResult
private fun initialValue(seekBar: SeekBar): SeekBarChangeEvent =
SeekBarProgressChangeEvent(seekBar, seekBar.progress, false)
@CheckResult
private fun listener(
scope: CoroutineScope,
emitter: (SeekBarChangeEvent) -> Unit,
) = object : SeekBar.OnSeekBarChangeListener {
override fun onProgressChanged(seekBar: SeekBar, progress: Int, fromUser: Boolean) {
onEvent(SeekBarProgressChangeEvent(seekBar, progress, fromUser))
}
override fun onStartTrackingTouch(seekBar: SeekBar) {
onEvent(SeekBarStartChangeEvent(seekBar))
}
override fun onStopTrackingTouch(seekBar: SeekBar) {
onEvent(SeekBarStopChangeEvent(seekBar))
}
private fun onEvent(event: SeekBarChangeEvent) {
if (scope.isActive) emitter(event)
}
}