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InterestsViewModel.kt
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InterestsViewModel.kt
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/*
* Copyright 2021 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.feature.interests
import androidx.lifecycle.SavedStateHandle
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import androidx.navigation.toRoute
import com.google.samples.apps.nowinandroid.core.data.repository.UserDataRepository
import com.google.samples.apps.nowinandroid.core.domain.GetFollowableTopicsUseCase
import com.google.samples.apps.nowinandroid.core.domain.TopicSortField
import com.google.samples.apps.nowinandroid.core.model.data.FollowableTopic
import com.google.samples.apps.nowinandroid.feature.interests.navigation.InterestsDestination
import dagger.hilt.android.lifecycle.HiltViewModel
import kotlinx.coroutines.flow.SharingStarted
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.map
import kotlinx.coroutines.flow.stateIn
import kotlinx.coroutines.launch
import javax.inject.Inject
@HiltViewModel
class InterestsViewModel @Inject constructor(
savedStateHandle: SavedStateHandle,
val userDataRepository: UserDataRepository,
getFollowableTopics: GetFollowableTopicsUseCase,
) : ViewModel() {
private val interestsDestination: InterestsDestination = savedStateHandle.toRoute()
val uiState: StateFlow<InterestsUiState> =
getFollowableTopics(sortBy = TopicSortField.NAME).map { topics ->
InterestsUiState.Interests(interestsDestination.topicId, topics)
}.stateIn(
scope = viewModelScope,
started = SharingStarted.WhileSubscribed(5_000),
initialValue = InterestsUiState.Loading,
)
fun followTopic(followedTopicId: String, followed: Boolean) {
viewModelScope.launch {
userDataRepository.setTopicIdFollowed(followedTopicId, followed)
}
}
}
sealed interface InterestsUiState {
data object Loading : InterestsUiState
data class Interests(
val selectedTopicId: String?,
val topics: List<FollowableTopic>,
) : InterestsUiState
data object Empty : InterestsUiState
}