/
SwipeDismissBehaviorDragStateChanges.kt
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/
SwipeDismissBehaviorDragStateChanges.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 android.view.View
import androidx.annotation.CheckResult
import androidx.coordinatorlayout.widget.CoordinatorLayout
import com.google.android.material.behavior.SwipeDismissBehavior
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 drag state change events from [View] on [SwipeDismissBehavior].
*
* @param scope Root coroutine scope
* @param capacity Capacity of the channel's buffer (no buffer by default)
* @param action An action to perform
*/
fun View.dragStateChanges(
scope: CoroutineScope,
capacity: Int = Channel.RENDEZVOUS,
action: suspend (Int) -> Unit,
) {
val events = scope.actor<Int>(Dispatchers.Main.immediate, capacity) {
for (state in channel) action(state)
}
val behavior = getBehavior(this)
behavior.listener = listener(scope, events::trySend)
events.invokeOnClose { behavior.setListener(null) }
}
/**
* Perform an action on the drag state change events from [View] on [SwipeDismissBehavior], inside
* new [CoroutineScope].
*
* *Warning:* The created actor uses [SwipeDismissBehavior.setListener]. 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 View.dragStateChanges(
capacity: Int = Channel.RENDEZVOUS,
action: suspend (Int) -> Unit,
) = coroutineScope {
dragStateChanges(this, capacity, action)
}
/**
* Create a channel which emits the drag state change events from [View] on [SwipeDismissBehavior].
*
* *Warning:* The created channel uses [SwipeDismissBehavior.setListener]. Only one channel can be
* used at a time.
*
* Example:
*
* ```
* launch {
* swipeDismissBehavior.dragStateChanges(scope)
* .consumeEach { /* handle drag state change */ }
* }
* ```
*
* @param scope Root coroutine scope
* @param capacity Capacity of the channel's buffer (no buffer by default)
*/
@CheckResult
fun View.dragStateChanges(
scope: CoroutineScope,
capacity: Int = Channel.RENDEZVOUS,
): ReceiveChannel<Int> = corbindReceiveChannel(capacity) {
val behavior = getBehavior(this@dragStateChanges)
behavior.listener = listener(scope, ::trySend)
invokeOnClose { behavior.setListener(null) }
}
/**
* Create a flow which emits the drag state change events from [View] on [SwipeDismissBehavior].
*
* *Warning:* The created flow uses [SwipeDismissBehavior.setListener]. Only one flow can be used at
* a time.
*
* Example:
*
* ```
* swipeDismissBehavior.dragStateChanges()
* .onEach { /* handle drag state change */ }
* .flowWithLifecycle(lifecycle)
* .launchIn(lifecycleScope) // lifecycle-runtime-ktx
* ```
*/
@CheckResult
fun View.dragStateChanges(): Flow<Int> = channelFlow {
val behavior = getBehavior(this@dragStateChanges)
behavior.listener = listener(this, ::trySend)
awaitClose { behavior.setListener(null) }
}
@CheckResult
private fun getBehavior(view: View): SwipeDismissBehavior<*> {
val params = view.layoutParams as? CoordinatorLayout.LayoutParams
?: throw IllegalArgumentException("The view is not in a Coordinator Layout.")
return params.behavior as SwipeDismissBehavior<*>?
?: throw IllegalStateException("There's no behavior set on this view.")
}
@CheckResult
private fun listener(
scope: CoroutineScope,
emitter: (Int) -> Unit,
) = object : SwipeDismissBehavior.OnDismissListener {
override fun onDismiss(view: View) = Unit
override fun onDragStateChanged(state: Int) {
if (scope.isActive) emitter(state)
}
}