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ViewModel.viewModel()

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/*
/*
* Copyright 2021 The Android Open Source Project
* Copyright 2024 The Android Open Source Project
*
*
* Licensed under the Apache License, Version 2.0 (the "License");
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* You may obtain a copy of the License at
*
*
* http://www.apache.org/licenses/LICENSE-2.0
* http://www.apache.org/licenses/LICENSE-2.0
*
*
* Unless required by applicable law or agreed to in writing, software
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* See the License for the specific language governing permissions and
* limitations under the License.
* limitations under the License.
*/
*/
@file:JvmName("ViewModelKt")
@file:JvmMultifileClass


package androidx.lifecycle.viewmodel.compose
package androidx.lifecycle.viewmodel.compose


import androidx.compose.runtime.Composable
import androidx.compose.runtime.Composable
import androidx.lifecycle.HasDefaultViewModelProviderFactory
import androidx.lifecycle.HasDefaultViewModelProviderFactory
import androidx.lifecycle.ViewModel
import androidx.lifecycle.ViewModel
import androidx.lifecycle.ViewModelProvider
import androidx.lifecycle.ViewModelProvider
import androidx.lifecycle.ViewModelStoreOwner
import androidx.lifecycle.ViewModelStoreOwner
import androidx.lifecycle.viewmodel.CreationExtras
import androidx.lifecycle.viewmodel.CreationExtras
import androidx.lifecycle.viewmodel.initializer
import androidx.lifecycle.viewmodel.initializer
import androidx.lifecycle.viewmodel.viewModelFactory
import androidx.lifecycle.viewmodel.viewModelFactory

import kotlin.reflect.KClass
/**
* Returns an existing [ViewModel] or creates a new one in the given owner (usually, a fragment or
* an activity), defaulting to the owner provided by [LocalViewModelStoreOwner].
*
* The created [ViewModel] is associated with the given [viewModelStoreOwner] and will be retained
* as long as the owner is alive (e.g. if it is an activity, until it is
* finished or process is killed).
*
* @param viewModelStoreOwner The owner of the [ViewModel] that controls the scope and lifetime
* of the returned [ViewModel]. Defaults to using [LocalViewModelStoreOwner].
* @param key The key to use to identify the [ViewModel].
* @param factory The [ViewModelProvider.Factory] that should be used to create the [ViewModel]
* or null if you would like to use the default factory from the [LocalViewModelStoreOwner]
* @return A [ViewModel] that is an instance of the given [VM] type.
*/
@Deprecated(
"Superseded by viewModel that takes CreationExtras",
level = DeprecationLevel.HIDDEN
)
@Suppress("MissingJvmstatic")
@Composable
public inline fun <reified VM : ViewModel> viewModel(
viewModelStoreOwner: ViewModelStoreOwner = checkNotNull(LocalViewModelStoreOwner.current) {
"No ViewModelStoreOwner was provided via LocalViewModelStoreOwner"
},
key: String? = null,
factory: ViewModelProvider.Factory? = null
): VM = viewModel(VM::class.java, viewModelStoreOwner, key, factory)


/**
/**
* Returns an existing [ViewModel] or creates a new one in the given owner (usually, a fragment or
* Returns an existing [ViewModel] or creates a new one in the given owner (usually, a fragment or
* an activity), defaulting to the owner provided by [LocalViewModelStoreOwner].
* an activity), defaulting to the owner provided by [LocalViewModelStoreOwner].
*
*
* The created [ViewModel] is associated with the given [viewModelStoreOwner] and will be retained
* The created [ViewModel] is associated with the given [viewModelStoreOwner] and will be retained
* as long as the owner is alive (e.g. if it is an activity, until it is
* as long as the owner is alive (e.g. if it is an activity, until it is
* finished or process is killed).
* finished or process is killed).
*
*
* If default arguments are provided via the [CreationExtras], they will be available to the
* If default arguments are provided via the [CreationExtras], they will be available to the
* appropriate factory when the [ViewModel] is created.
* appropriate factory when the [ViewModel] is created.
*
*
* @param viewModelStoreOwner The owner of the [ViewModel] that controls the scope and lifetime
* @param viewModelStoreOwner The owner of the [ViewModel] that controls the scope and lifetime
* of the returned [ViewModel]. Defaults to using [LocalViewModelStoreOwner].
* of the returned [ViewModel]. Defaults to using [LocalViewModelStoreOwner].
* @param key The key to use to identify the [ViewModel].
* @param key The key to use to identify the [ViewModel].
* @param factory The [ViewModelProvider.Factory] that should be used to create the [ViewModel]
* @param factory The [ViewModelProvider.Factory] that should be used to create the [ViewModel]
* or null if you would like to use the default factory from the [LocalViewModelStoreOwner]
* or null if you would like to use the default factory from the [LocalViewModelStoreOwner]
* @param extras The default extras used to create the [ViewModel].
* @param extras The default extras used to create the [ViewModel].
* @return A [ViewModel] that is an instance of the given [VM] type.
* @return A [ViewModel] that is an instance of the given [VM] type.
*
*
* @sample androidx.lifecycle.viewmodel.compose.samples.CreationExtrasViewModel
* @sample androidx.lifecycle.viewmodel.compose.samples.CreationExtrasViewModel
*/
*/
@Suppress("MissingJvmstatic")
@Suppress("MissingJvmstatic")
@Composable
@Composable
public inline fun <reified VM : ViewModel> viewModel(
public inline fun <reified VM : ViewModel> viewModel(
viewModelStoreOwner: ViewModelStoreOwner = checkNotNull(LocalViewModelStoreOwner.current) {
viewModelStoreOwner: ViewModelStoreOwner = checkNotNull(LocalViewModelStoreOwner.current) {
"No ViewModelStoreOwner was provided via LocalViewModelStoreOwner"
"No ViewModelStoreOwner was provided via LocalViewModelStoreOwner"
},
},
key: String? = null,
key: String? = null,
factory: ViewModelProvider.Factory? = null,
factory: ViewModelProvider.Factory? = null,
extras: CreationExtras = if (viewModelStoreOwner is HasDefaultViewModelProviderFactory) {
extras: CreationExtras = if (viewModelStoreOwner is HasDefaultViewModelProviderFactory) {
viewModelStoreOwner.defaultViewModelCreationExtras
viewModelStoreOwner.defaultViewModelCreationExtras
} else {
} else {
CreationExtras.Empty
CreationExtras.Empty
}
}
): VM = viewModel(VM::class.java, viewModelStoreOwner, key, factory, extras)
): VM = viewModel(VM::class, viewModelStoreOwner, key, factory, extras)

/**
* Returns an existing [ViewModel] or creates a new one in the scope (usually, a fragment or
* an activity)
*
* The created [ViewModel] is associated with the given [viewModelStoreOwner] and will be retained
* as long as the scope is alive (e.g. if it is an activity, until it is
* finished or process is killed).
*
* @param modelClass The class of the [ViewModel] to create an instance of it if it is not
* present.
* @param viewModelStoreOwner The scope that the created [ViewModel] should be associated with.
* @param key The key to use to identify the [ViewModel].
* @return A [ViewModel] that is an instance of the given [VM] type.
*/
@Deprecated(
"Superseded by viewModel that takes CreationExtras",
level = DeprecationLevel.HIDDEN
)
@Suppress("MissingJvmstatic")
@Composable
public fun <VM : ViewModel> viewModel(
modelClass: Class<VM>,
viewModelStoreOwner: ViewModelStoreOwner = checkNotNull(LocalViewModelStoreOwner.current) {
"No ViewModelStoreOwner was provided via LocalViewModelStoreOwner"
},
key: String? = null,
factory: ViewModelProvider.Factory? = null
): VM = viewModelStoreOwner.get(modelClass, key, factory)


/**
/**
* Returns an existing [ViewModel] or creates a new one in the scope (usually, a fragment or
* Returns an existing [ViewModel] or creates a new one in the scope (usually, a fragment or
* an activity)
* an activity)
*
*
* The created [ViewModel] is associated with the given [viewModelStoreOwner] and will be retained
* The created [ViewModel] is associated with the given [viewModelStoreOwner] and will be retained
* as long as the scope is alive (e.g. if it is an activity, until it is
* as long as the scope is alive (e.g. if it is an activity, until it is
* finished or process is killed).
* finished or process is killed).
*
*
* If default arguments are provided via the [CreationExtras], they will be available to the
* If default arguments are provided via the [CreationExtras], they will be available to the
* appropriate factory when the [ViewModel] is created.
* appropriate factory when the [ViewModel] is created.
*
*
* @param modelClass The class of the [ViewModel] to create an instance of it if it is not
* @param modelClass The class of the [ViewModel] to create an instance of it if it is not
* present.
* present.
* @param viewModelStoreOwner The scope that the created [ViewModel] should be associated with.
* @param viewModelStoreOwner The scope that the created [ViewModel] should be associated with.
* @param key The key to use to identify the [ViewModel].
* @param key The key to use to identify the [ViewModel].
* @param factory The [ViewModelProvider.Factory] that should be used to create the [ViewModel]
* or null if you would like to use the default factory from the [LocalViewModelStoreOwner]
* @param extras The default extras used to create the [ViewModel].
* @param extras The default extras used to create the [ViewModel].
* @return A [ViewModel] that is an instance of the given [VM] type.
* @return A [ViewModel] that is an instance of the given [VM] type.
*
*
* @sample androidx.lifecycle.viewmodel.compose.samples.CreationExtrasViewModel
* @sample androidx.lifecycle.viewmodel.compose.samples.CreationExtrasViewModel
*/
*/
@Suppress("MissingJvmstatic")
@Suppress("MissingJvmstatic")
@Composable
@Composable
public fun <VM : ViewModel> viewModel(
public fun <VM : ViewModel> viewModel(
modelClass: Class<VM>,
modelClass: KClass<VM>,
viewModelStoreOwner: ViewModelStoreOwner = checkNotNull(LocalViewModelStoreOwner.current) {
viewModelStoreOwner: ViewModelStoreOwner = checkNotNull(LocalViewModelStoreOwner.current) {
"No ViewModelStoreOwner was provided via LocalViewModelStoreOwner"
"No ViewModelStoreOwner was provided via LocalViewModelStoreOwner"
},
},
key: String? = null,
key: String? = null,
factory: ViewModelProvider.Factory? = null,
factory: ViewModelProvider.Factory? = null,
extras: CreationExtras = if (viewModelStoreOwner is HasDefaultViewModelProviderFactory) {
extras: CreationExtras = if (viewModelStoreOwner is HasDefaultViewModelProviderFactory) {
viewModelStoreOwner.defaultViewModelCreationExtras
viewModelStoreOwner.defaultViewModelCreationExtras
} else {
} else {
CreationExtras.Empty
CreationExtras.Empty
}
}
): VM = viewModelStoreOwner.get(modelClass, key, factory, extras)
): VM = viewModelStoreOwner.get(modelClass, key, factory, extras)


/**
/**
* Returns an existing [ViewModel] or creates a new one in the scope (usually, a fragment or
* Returns an existing [ViewModel] or creates a new one in the scope (usually, a fragment or
* an activity)
* an activity)
*
*
* The created [ViewModel] is associated with the given [viewModelStoreOwner] and will be retained
* The created [ViewModel] is associated with the given [viewModelStoreOwner] and will be retained
* as long as the scope is alive (e.g. if it is an activity, until it is
* as long as the scope is alive (e.g. if it is an activity, until it is
* finished or process is killed).
* finished or process is killed).
*
*
* If the [viewModelStoreOwner] implements [HasDefaultViewModelProviderFactory] its default
* If the [viewModelStoreOwner] implements [HasDefaultViewModelProviderFactory] its default
* [CreationExtras] are the ones that will be provided to the receiver scope from the [initializer]
* [CreationExtras] are the ones that will be provided to the receiver scope from the [initializer]
*
*
* @param viewModelStoreOwner The scope that the created [ViewModel] should be associated with.
* @param viewModelStoreOwner The scope that the created [ViewModel] should be associated with.
* @param key The key to use to identify the [ViewModel].
* @param key The key to use to identify the [ViewModel].
* @param initializer lambda used to create an instance of the ViewModel class
* @param initializer lambda used to create an instance of the ViewModel class
* @return A [ViewModel] that is an instance of the given [VM] type.
* @return A [ViewModel] that is an instance of the given [VM] type.
*
*
* @sample androidx.lifecycle.viewmodel.compose.samples.CreationExtrasViewModelInitializer
* @sample androidx.lifecycle.viewmodel.compose.samples.CreationExtrasViewModelInitializer
*/
*/
@Composable
@Composable
public inline fun <reified VM : ViewModel> viewModel(
public inline fun <reified VM : ViewModel> viewModel(
viewModelStoreOwner: ViewModelStoreOwner = checkNotNull(LocalViewModelStoreOwner.current) {
viewModelStoreOwner: ViewModelStoreOwner = checkNotNull(LocalViewModelStoreOwner.current) {
"No ViewModelStoreOwner was provided via LocalViewModelStoreOwner"
"No ViewModelStoreOwner was provided via LocalViewModelStoreOwner"
},
},
key: String? = null,
key: String? = null,
noinline initializer: CreationExtras.() -> VM
noinline initializer: CreationExtras.() -> VM
): VM = viewModel(
): VM = viewModel(
VM::class.java,
VM::class,
viewModelStoreOwner,
viewModelStoreOwner,
key,
key,
viewModelFactory { initializer(initializer) },
viewModelFactory { initializer(initializer) },
if (viewModelStoreOwner is HasDefaultViewModelProviderFactory) {
if (viewModelStoreOwner is HasDefaultViewModelProviderFactory) {
viewModelStoreOwner.defaultViewModelCreationExtras
viewModelStoreOwner.defaultViewModelCreationExtras
} else {
} else {
CreationExtras.Empty
CreationExtras.Empty
}
}
)
)


private fun <VM : ViewModel> ViewModelStoreOwner.get(
internal fun <VM : ViewModel> ViewModelStoreOwner.get(
javaClass: Class<VM>,
modelClass: KClass<VM>,
key: String? = null,
key: String? = null,
factory: ViewModelProvider.Factory? = null,
factory: ViewModelProvider.Factory? = null,
extras: CreationExtras = if (this is HasDefaultViewModelProviderFactory) {
extras: CreationExtras = if (this is HasDefaultViewModelProviderFactory) {
this.defaultViewModelCreationExtras
this.defaultViewModelCreationExtras
} else {
} else {
CreationExtras.Empty
CreationExtras.Empty
}
}
): VM {
): VM {
val provider = if (factory != null) {
val provider = if (factory != null) {
ViewModelProvider(this.viewModelStore, factory, extras)
ViewModelProvider.create(this.viewModelStore, factory, extras)
} else if (this is HasDefaultViewModelProviderFactory) {
} else if (this is HasDefaultViewModelProviderFactory) {
ViewModelProvider(this.viewModelStore, this.defaultViewModelProviderFactory, extras)
ViewModelProvider.create(this.viewModelStore, this.defaultViewModelProviderFactory, extras)
} else {
} else {
ViewModelProvider(this)
ViewModelProvider.create(this)
}
}
return if (key != null) {
return if (key != null) {
provider[key, javaClass]
provider[key, modelClass]
} else {
} else {
provider[javaClass]
provider[modelClass]
}
}
}
}


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