/
MaskableFrameLayoutMaskChanges.kt
125 lines (117 loc) · 4.02 KB
/
MaskableFrameLayoutMaskChanges.kt
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/*
* Copyright 2023 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.graphics.RectF
import androidx.annotation.CheckResult
import com.google.android.material.carousel.MaskableFrameLayout
import com.google.android.material.carousel.OnMaskChangedListener
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.corbindReceiveChannel
/**
* Perform an action when changes in a [mask's][MaskableFrameLayout] [RectF] occur.
*
* *Warning:* The created actor uses [OnMaskChangedListener]. 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 MaskableFrameLayout.maskChanges(
scope: CoroutineScope,
capacity: Int = Channel.RENDEZVOUS,
action: suspend (RectF) -> Unit,
) {
val events = scope.actor<RectF>(Dispatchers.Main.immediate, capacity) {
for (changes in channel) action(changes)
}
setOnMaskChangedListener(listener(scope, events::trySend))
events.invokeOnClose { setOnMaskChangedListener(null) }
}
/**
* Perform an action when changes in a [mask's][MaskableFrameLayout] [RectF] occur, inside new
* [CoroutineScope].
*
* *Warning:* The created actor uses [OnMaskChangedListener]. 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 MaskableFrameLayout.maskChanges(
capacity: Int = Channel.RENDEZVOUS,
action: suspend (RectF) -> Unit,
) = coroutineScope {
maskChanges(this, capacity, action)
}
/**
* Create a channel which emits when changes in a [mask's][MaskableFrameLayout] [RectF] occur.
*
* *Warning:* The created channel uses [OnMaskChangedListener]. Only one channel can be used at a
* time.
*
* Examples:
*
* ```
* launch {
* (viewHolder.itemView as MaskableFrameLayout).maskChanges(scope)
* .consumeEach { /* handle mask change */ }
* }
* ```
*
* @param scope Root coroutine scope
* @param capacity Capacity of the channel's buffer (no buffer by default)
*/
@CheckResult
fun MaskableFrameLayout.maskChanges(
scope: CoroutineScope,
capacity: Int = Channel.RENDEZVOUS,
): ReceiveChannel<RectF> = corbindReceiveChannel(capacity) {
setOnMaskChangedListener(listener(scope, ::trySend))
invokeOnClose { setOnMaskChangedListener(null) }
}
/**
* Create a flow which emits when changes in a [mask's][MaskableFrameLayout] [RectF] occur.
*
* *Warning:* The created flow uses [OnMaskChangedListener]. Only one flow can be used at a time.
*
* Examples:
*
* ```
* (viewHolder.itemView as MaskableFrameLayout).maskChanges()
* .onEach { /* handle mask change */ }
* .flowWithLifecycle(lifecycle)
* .launchIn(scope)
* ```
*/
@CheckResult
fun MaskableFrameLayout.maskChanges() = channelFlow {
setOnMaskChangedListener(listener(this, ::trySend))
awaitClose { setOnMaskChangedListener(null) }
}
@CheckResult
private fun listener(
scope: CoroutineScope,
emitter: (RectF) -> Unit,
) = OnMaskChangedListener { maskRect ->
if (scope.isActive) emitter(maskRect)
}