Created
February 16, 2020 20:49
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View model factory extensions
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import android.os.Bundle | |
import androidx.fragment.app.Fragment | |
import androidx.fragment.app.activityViewModels | |
import androidx.fragment.app.viewModels | |
import androidx.lifecycle.AbstractSavedStateViewModelFactory | |
import androidx.lifecycle.SavedStateHandle | |
import androidx.lifecycle.ViewModel | |
import androidx.lifecycle.ViewModelProvider | |
import androidx.savedstate.SavedStateRegistryOwner | |
typealias CreateViewModel = (handle: SavedStateHandle) -> ViewModel | |
inline fun <reified VM : ViewModel> Fragment.viewModelByFactory( | |
defaultArgs: Bundle? = null, | |
noinline create: CreateViewModel | |
): Lazy<VM> { | |
return viewModels { | |
createViewModelFactoryFactory(this, defaultArgs, create) | |
} | |
} | |
inline fun <reified VM : ViewModel> Fragment.activityViewModelByFactory( | |
defaultArgs: Bundle? = null, | |
noinline create: CreateViewModel | |
): Lazy<VM> { | |
return activityViewModels { | |
createViewModelFactoryFactory(this, defaultArgs, create) | |
} | |
} | |
fun createViewModelFactoryFactory( | |
owner: SavedStateRegistryOwner, | |
defaultArgs: Bundle?, | |
create: CreateViewModel | |
): ViewModelProvider.Factory { | |
return object : AbstractSavedStateViewModelFactory(owner, defaultArgs) { | |
override fun <T : ViewModel?> create(key: String, modelClass: Class<T>, handle: SavedStateHandle): T { | |
@Suppress("UNCHECKED_CAST") | |
return create(handle) as? T | |
?: throw IllegalArgumentException("Unknown viewmodel class!") | |
} | |
} | |
} |
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