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PlantListViewModel.kt
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PlantListViewModel.kt
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/*
* Copyright 2018 Google LLC
*
* 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.sunflower.viewmodels
import androidx.lifecycle.MediatorLiveData
import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.Transformations
import androidx.lifecycle.ViewModel
import com.google.samples.apps.sunflower.PlantListFragment
import com.google.samples.apps.sunflower.data.Plant
import com.google.samples.apps.sunflower.data.PlantRepository
/**
* The ViewModel for [PlantListFragment].
*/
class PlantListViewModel internal constructor(
private val plantRepository: PlantRepository
) : ViewModel() {
private val growZoneNumber = MutableLiveData<Int>()
private val plantList = MediatorLiveData<List<Plant>>()
init {
growZoneNumber.value = NO_GROW_ZONE
val livePlantList = Transformations.switchMap(growZoneNumber) {
if (it == NO_GROW_ZONE) {
plantRepository.getPlants()
} else {
plantRepository.getPlantsWithGrowZoneNumber(it)
}
}
plantList.addSource(livePlantList, plantList::setValue)
}
fun getPlants() = plantList
fun setGrowZoneNumber(num: Int) {
growZoneNumber.value = num
}
fun clearGrowZoneNumber() {
growZoneNumber.value = NO_GROW_ZONE
}
fun isFiltered() = growZoneNumber.value != NO_GROW_ZONE
companion object {
private const val NO_GROW_ZONE = -1
}
}