/*
 * Copyright 2019 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
 *
 *     http://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.example.android.motion.demo.dissolve

import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.ViewModel
import androidx.lifecycle.map
import com.example.android.motion.model.Cheese

class DissolveViewModel : ViewModel() {

    private val position = MutableLiveData(0)

    val image = position.map { p -> Cheese.IMAGES[p % Cheese.IMAGES.size] }

    fun nextImage() {
        position.value?.let { position.value = it + 1 }
    }
}
