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VolumeViewModel.kt
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VolumeViewModel.kt
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/*
* Copyright 2022 The Android Open Source Project
*
* 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
*
* https://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 com.google.android.horologist.audio.ui
import android.media.AudioManager
import android.os.Build
import android.os.VibrationEffect
import android.os.Vibrator
import android.util.Log
import androidx.lifecycle.ViewModel
import androidx.lifecycle.ViewModelProvider
import androidx.lifecycle.ViewModelProvider.AndroidViewModelFactory.Companion.APPLICATION_KEY
import androidx.lifecycle.viewModelScope
import androidx.lifecycle.viewmodel.initializer
import androidx.lifecycle.viewmodel.viewModelFactory
import com.google.android.horologist.annotations.ExperimentalHorologistApi
import com.google.android.horologist.audio.AudioOutput
import com.google.android.horologist.audio.AudioOutputRepository
import com.google.android.horologist.audio.SystemAudioRepository
import com.google.android.horologist.audio.VolumeRepository
import com.google.android.horologist.audio.ui.mapper.VolumeUiStateMapper
import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.flow.MutableSharedFlow
import kotlinx.coroutines.flow.SharingStarted
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.drop
import kotlinx.coroutines.flow.map
import kotlinx.coroutines.flow.merge
import kotlinx.coroutines.flow.stateIn
/**
* ViewModel for a Volume Control Screen.
*
* Holds the state of both Volume ([volumeState]) and AudioOutput (audioOutput).
*
* Volume changes can be made via [increaseVolume] and [decreaseVolume].
*
* See [AudioManager.setStreamVolume]
* See [AudioManager.STREAM_MUSIC]
*/
@ExperimentalHorologistApi
public open class VolumeViewModel(
internal val volumeRepository: VolumeRepository,
internal val audioOutputRepository: AudioOutputRepository,
private val onCleared: () -> Unit = {},
private val vibrator: Vibrator
) : ViewModel() {
private val userActionEvents = MutableSharedFlow<Unit>(extraBufferCapacity = 1)
public val volumeUiState: StateFlow<VolumeUiState> =
volumeRepository.volumeState.map(VolumeUiStateMapper::map).stateIn(
scope = viewModelScope,
started = SharingStarted.WhileSubscribed(5000),
initialValue = VolumeUiState()
)
public val displayIndicatorEvents: Flow<Unit> = merge(userActionEvents, volumeUiState.drop(1)).map { }
public val audioOutput: StateFlow<AudioOutput> = audioOutputRepository.audioOutput
public fun increaseVolumeWithHaptics() {
increaseVolume()
if (!volumeUiState.value.isMax) {
performHaptics()
}
}
public fun decreaseVolumeWithHaptics() {
decreaseVolume()
if (!volumeUiState.value.isMin) {
performHaptics()
}
}
public fun increaseVolume() {
this.userActionEvents.tryEmit(Unit)
volumeRepository.increaseVolume()
}
public fun decreaseVolume() {
this.userActionEvents.tryEmit(Unit)
volumeRepository.decreaseVolume()
}
public fun launchOutputSelection() {
audioOutputRepository.launchOutputSelection(closeOnConnect = false)
}
override fun onCleared() {
onCleared.invoke()
}
private fun performHaptics() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
val effect = VibrationEffect.createPredefined(VibrationEffect.EFFECT_CLICK)
vibrator.vibrate(effect)
} else {
notSupported()
}
}
private fun notSupported() {
Log.i(TAG, "Effect not supported")
}
public fun onVolumeChangeByScroll(pixels: Float) {
when {
pixels > 0 -> increaseVolumeWithHaptics()
pixels < 0 -> decreaseVolumeWithHaptics()
}
}
public fun setVolume(volume: Int) {
this.userActionEvents.tryEmit(Unit)
if (volume != volumeRepository.volumeState.value.current) {
volumeRepository.setVolume(volume)
}
}
@ExperimentalHorologistApi
public companion object {
private const val TAG = "VolumeViewModel"
public val Factory: ViewModelProvider.Factory = viewModelFactory {
initializer {
val application = this[APPLICATION_KEY]!!
val audioRepository = SystemAudioRepository.fromContext(application)
val vibrator: Vibrator = application.getSystemService(Vibrator::class.java)
VolumeViewModel(audioRepository, audioRepository, onCleared = {
audioRepository.close()
}, vibrator)
}
}
}
}