[Kotlin/코드] MVP (2)

이전에 했던 코드(https://relz.tistory.com/64)에서 테스트용으로 넣었던 저장&불러오기를 없애고

사칙연산 버전으로 변경하였음

 

1. Contract

package com.monkey.mvpstudy

interface Contract {
    interface View {
        fun setValue(num1: Int, num2: Int, num3: Int)
        fun showResult(num: Int)
    }

    interface Presenter {
        fun getSum(num1: Int, num2: Int)
        fun getSubtract(num1: Int, num2: Int)
        fun getMultiply(num1: Int, num2: Int)
        fun getDivide(num1: Int, num2: Int)
    }
}

 

 

2. MainModel

class MainModel {
    var num1 = 0
    var num2 = 0

    fun plus() : () -> Int = { num1 + num2 }
    fun subtract() : () -> Int = { num1 - num2 }
    fun multiply() : () -> Int = { num1 * num2 }
    fun divide() : () -> Int = { num1 / num2 }
}

 

3. MainActivity

package com.monkey.mvpstudy

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import com.monkey.mvpstudy.databinding.ActivityMainBinding

class MainActivity : AppCompatActivity(), Contract.View, View.OnClickListener {
    private val binding by lazy {
        ActivityMainBinding.inflate(layoutInflater)
    }
    private val presenter by lazy {
        MyPresenter(this)
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(binding.root)

        binding.btnSum.setOnClickListener(this)
        binding.btnSubtract.setOnClickListener(this)
        binding.btnMultiply.setOnClickListener(this)
        binding.btnDivide.setOnClickListener(this)
    }

    override fun setValue(num1: Int, num2: Int, num3: Int) {
        binding.etNum1.setText(num1.toString())
        binding.etNum2.setText(num2.toString())
        showResult(num3)
    }

    override fun showResult(num: Int) {
        binding.tvResult.text = num.toString()
    }

    override fun onClick(v: View?) {
        val num1 = binding.etNum1.text.toString().toInt()
        val num2 = binding.etNum2.text.toString().toInt()

        when(v) {
            binding.btnSum -> presenter.getSum(num1, num2)
            binding.btnSubtract -> presenter.getSubtract(num1, num2)
            binding.btnMultiply -> presenter.getMultiply(num1, num2)
            binding.btnDivide -> presenter.getDivide(num1, num2)
        }
    }
}

 

4. MyPresent

package com.monkey.mvpstudy

class MyPresenter : Contract.Presenter {

    private var view : Contract.View
    private var model : MainModel

    constructor(view: Contract.View) {
        this.view = view
        this.model = MainModel()
    }

    override fun getSum(num1: Int, num2: Int) {
        val result = calculate(num1, num2, model.plus())
        view.showResult(result)
    }

    override fun getSubtract(num1: Int, num2: Int) {
        val result = calculate(num1, num2, model.subtract())
        view.showResult(result)
    }

    override fun getMultiply(num1: Int, num2: Int) {
        val result = calculate(num1, num2, model.multiply())
        view.showResult(result)
    }

    override fun getDivide(num1: Int, num2: Int) {
        val result = calculate(num1, num2, model.divide())
        view.showResult(result)
    }


    private fun calculate(num1: Int, num2: Int, calc: () -> Int): Int {
        model.num1 = num1
        model.num2 = num2
        return calc()
    }
}