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GameViewModel.kt
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GameViewModel.kt
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/*
* Copyright (C) 2019 Google Inc.
*
* 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.guesstheword.screens.game
import android.util.Log
import androidx.lifecycle.LiveData
import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.ViewModel
/**
* ViewModel containing all the logic needed to run the game
*/
class GameViewModel : ViewModel() {
// The current _word
private val _word = MutableLiveData<String>()
val word: LiveData<String>
get() = _word
// The current score
private val _score = MutableLiveData<Int>()
val score: LiveData<Int>
get() = _score
// Countdown time
private val _eventGameFinish = MutableLiveData<Boolean>()
val eventGameFinish: LiveData<Boolean>
get() = _eventGameFinish
// The list of words - the front of the list is the next _word to guess
private lateinit var wordList: MutableList<String>
/**
* Resets the list of words and randomizes the order
*/
private fun resetList() {
wordList = mutableListOf(
"queen",
"hospital",
"basketball",
"cat",
"change",
"snail",
"soup",
"calendar",
"sad",
"desk",
"guitar",
"home",
"railway",
"zebra",
"jelly",
"car",
"crow",
"trade",
"bag",
"roll",
"bubble"
)
wordList.shuffle()
}
init {
_word.value = ""
_score.value = 0
Log.i("GameViewModel", "GameViewModel created!")
resetList()
nextWord()
}
/**
* Callback called when the ViewModel is destroyed
*/
override fun onCleared() {
super.onCleared()
Log.i("GameViewModel", "GameViewModel destroyed!")
}
/** Methods for updating the UI **/
fun onSkip() {
if (!wordList.isEmpty()) {
_score.value = (_score.value)?.minus(1)
}
nextWord()
}
fun onCorrect() {
if (!wordList.isEmpty()) {
_score.value = (_score.value)?.plus(1)
}
nextWord()
}
/**
* Moves to the next _word in the list.
*/
private fun nextWord() {
if (wordList.isEmpty()) {
onGameFinish()
} else {
//Select and remove a _word from the list
_word.value = wordList.removeAt(0)
}
}
/** Method for the game completed event **/
fun onGameFinishComplete() {
_eventGameFinish.value = false
}
fun onGameFinish() {
_eventGameFinish.value = true
}
}