MVC/ MVP / MVVM 架构学习之井字游戏_2_MVP实现

MVC 实现参考前一篇： https://blog.csdn.net/whjk20/article/details/107213015

其中，布局文件和 Model 的实现不变， 使用Presenter 代替 Controller，把Activity 抽离出来成为View， 因此仅写变化的部分

目录

1. Presenter (与Model 和 View 交互)

2. View (对View的操作抽象为借口 TicTacToeView， 供Presenter 调用 )

---

1. Presenter (与Model 和 View 交互)

interface IPresenter {

    fun onCreate()
    fun onPause()
    fun onResume()
    fun onDestroy()
}

// Presenter 如何持有View的引用 -> 创建的时候传入
class TicTacToePresenter : IPresenter {
    private var tictactoeView: TicTacToeView
    private var model: Board? = null

    override fun onCreate() {
        model = Board()
    }

    constructor(tictactoeView: TicTacToeView) {
        this.tictactoeView = tictactoeView
    }

    override fun onPause() {

    }

    override fun onResume() {
    }

    override fun onDestroy() {

    }

    fun onButtonSelected(row: Int, col: Int) {
        var playerThatMoved = model?.mark(row, col);

        playerThatMoved?.let {tictactoeView.setButtonText(row, col, it.toString()) }
        model?.winner?.let { tictactoeView.showWinner(it.toString()) }
    }

    fun onResetSelected() {
        tictactoeView.clearWinnerDisplay()
        tictactoeView.clearButtons()
        model!!.restart()
    }

}

2. View (对View的操作抽象为借口 TicTacToeView， 供Presenter 调用 )

interface TicTacToeView {
    fun showWinner(winningPlayerDisplayLabel: String?)
    fun clearWinnerDisplay()
    fun clearButtons()
    fun setButtonText(row: Int, col: Int, text: String?)
}

// 操作VIEW的抽象成接口，供presenter调用； 不用管model
// Activity 充当了VIEW， 只管初始化和更新UI操作
class TicTacToeMVPActivity : AppCompatActivity(), TicTacToeView {

    companion object {
        const val TAG = "TicTacToeMVPActivity"
    }

    private var presenter = TicTacToePresenter(this)

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

        setContentView(R.layout.activity_tictactoe_mvc)
        presenter.onCreate()
    }

    override fun onCreateOptionsMenu(menu: Menu?): Boolean {
        menuInflater.inflate(R.menu.reset_menu, menu)
        return super.onCreateOptionsMenu(menu)
    }

    override fun onOptionsItemSelected(item: MenuItem): Boolean {
        when (item.itemId) {
            R.id.design_reset -> {
                //交给presenter处理
                presenter.onResetSelected()
                return true
            }
        }
        return super.onOptionsItemSelected(item)
    }

    fun onCellClicked(view: View) {
        // 读取VIEW操作
        var clickedButton = view as Button

        var tag = clickedButton.tag.toString()
        var clickedRow = Integer.valueOf(tag.substring(0, 1))
        var clickedCol = Integer.valueOf(tag.substring(1, 2))
        Log.d(TAG, "onCellClicked - clickedRow = $clickedRow, clickedCol=$clickedCol")

        //交给presenter处理
        presenter.onButtonSelected(clickedRow, clickedCol)
    }

    //VIEW的操作
    override fun showWinner(winningPlayerDisplayLabel: String?) {
        winnerPlayerViewGroup.visibility = View.VISIBLE
        winnerPlayerLabel.text = winningPlayerDisplayLabel
    }

    override fun clearWinnerDisplay() {
        winnerPlayerViewGroup.visibility = View.GONE
        winnerPlayerLabel.text = EMPTY_TEXT
    }

    override fun clearButtons() {
        for (index in 0 until buttonGrid.childCount) {
            (buttonGrid.getChildAt(index) as Button).text = EMPTY_TEXT
        }
    }

    override fun setButtonText(row: Int, col: Int, text: String?) {
        val btn = buttonGrid.findViewWithTag("" + row + col) as Button
        btn?.text = text
    }

}

 

本文地址：https://blog.csdn.net/whjk20/article/details/107213294