refactor: extract stateInUi helper to reduce ViewModel boilerplate #2099
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,46 @@ | ||
| /* | ||
| * Copyright 2024 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.samples.apps.nowinandroid.core.ui | ||
|
|
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| import androidx.lifecycle.ViewModel | ||
| import androidx.lifecycle.viewModelScope | ||
| import kotlinx.coroutines.flow.Flow | ||
| import kotlinx.coroutines.flow.SharingStarted | ||
| import kotlinx.coroutines.flow.StateFlow | ||
| import kotlinx.coroutines.flow.stateIn | ||
|
|
||
| /** | ||
| * Converts a [Flow] to a [StateFlow] scoped to the [ViewModel]'s lifecycle, using | ||
| * [SharingStarted.WhileSubscribed] with a 5-second stop timeout. | ||
| * | ||
| * Shorthand for: | ||
| * ``` | ||
| * stateIn( | ||
| * scope = viewModelScope, | ||
| * started = SharingStarted.WhileSubscribed(5_000), | ||
| * initialValue = initialValue, | ||
| * ) | ||
| * ``` | ||
| * | ||
| * The [ViewModel] context is resolved implicitly from `this` when called inside a [ViewModel]. | ||
| */ | ||
| context(viewModel: ViewModel) | ||
| fun <T> Flow<T>.stateInUi(initialValue: T): StateFlow<T> = stateIn( | ||
| scope = viewModel.viewModelScope, | ||
| started = SharingStarted.WhileSubscribed(5_000), | ||
| initialValue = initialValue, | ||
| ) | ||
|
Comment on lines
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There was a problem hiding this comment. Consider extracting the private const val StopTimeoutMillis = 5_000L
context(viewModel: ViewModel)
fun <T> Flow<T>.stateInUi(
initialValue: T,
started: SharingStarted = SharingStarted.WhileSubscribed(StopTimeoutMillis),
): StateFlow<T> = stateIn(
scope = viewModel.viewModelScope,
started = started,
initialValue = initialValue,
) |
||
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Since
ViewModelis used in the public signature of thestateInUiextension function (as a context parameter), this dependency should be declared asapiinstead ofimplementation. This ensures that consumer modules have access to theViewModeltype during compilation when they use this extension.