MVP(model,view Presenter) Pattern(模式) 学习_mvp patten

  昨天下了Microsoft Unity想学习一下ioc的东西，没想到自己连mvp pattern还不知道呢,太无知了,MVP 是从经典的模式MVC演变而来，它们的基本思想有相通的地方：Controller/Presenter负责逻辑的处理，Model提供数据，View负责显示。作为一种新的模式，MVP与MVC有着一个重大的区别：在MVP中View并不直接使用Model，它们之间的通信是通过Presenter (MVC中的Controller)来进行的，所有的交互都发生在Presenter内部，而在MVC中View会从直接Model中读取数据而不是通过 Controller。,现在我把 Unity的实例中用到的mvp的代码整理出来了,还花了我一番功夫的，没有的依赖注入了，类的实例化还得手动处理,但是我整理的这个一个地方违背了mvp的原则(只是想代码简单些)

，顺便也考考你的眼力如何，能否看出哪一点违背了mvp的原则，呵呵！源代码如下（或者去我的资源了下载完整的源代码也可以）：

  public interface IStoplightView : INotifyPropertyChanged
    {
        Color CurrentColor { get; set; }

        string GreenDuration { get; set; }
        string YellowDuration { get; set; }
        string RedDuration { get; set; }

        event EventHandler UpdateClicked;
        event EventHandler ForceChangeClicked;
    }

    public static class StoplightViewProperties
    {
        public const string CurrentColor = "CurrentColor";
        public const string GreenDuration = "GreenDuration";
        public const string YellowDuration = "YellowDuration";
        public const string RedDuration = "RedDuration";
    }

    public enum StoplightColors
    {
        Green,
        Yellow,
        Red
    }

————————————————————————————————————

public class LightChangedEventArgs : EventArgs
    {
        private StoplightColors currentColor;

        public StoplightColors CurrentColor
        {
            get { return currentColor; }
            private set { currentColor = value; }
        }

        public LightChangedEventArgs(StoplightColors color)
        {
            CurrentColor = color;
        }
    }

    public delegate void StoplightChangedHandler(object sender, LightChangedEventArgs e);

    public class Stoplight
    {
        public const StoplightColors Green = StoplightColors.Green;
        public const StoplightColors Yellow = StoplightColors.Yellow;
        public const StoplightColors Red = StoplightColors.Red;

        private StoplightColors currentColor = StoplightColors.Green;

        public event StoplightChangedHandler Changed;

        public StoplightColors CurrentColor
        {
            get { return currentColor; }
        }

        public void Next()
        {
            ++currentColor;
            if (currentColor > StoplightColors.Red)
            {
                currentColor = StoplightColors.Green;
            }
            RaiseChanged();
        }

        protected void RaiseChanged()
        {
            StoplightChangedHandler handlers = Changed;
            if (handlers != null)
            {
                LightChangedEventArgs e = new LightChangedEventArgs(currentColor);
                handlers(this, e);
            }
        }
    }

————————————————————————————————————————

 public class StoplightPresenter
    {
        private Timer timer;

        public Timer Timer
        {
            get { return timer; }
            set { timer = value; }
        }


        private Stoplight stoplight;

        public Stoplight Stoplight
        {
            get { return stoplight; }
            set { stoplight = value; }
        }


        private StoplightSchedule schedule;

        public StoplightSchedule Schedule
        {
            get { return schedule; }
            set { schedule = value; }
        }

        /// <summary>
        /// 构造方法
        /// </summary>
        /// <param name="timer"></param>
        public StoplightPresenter(Timer timer)
        {
            this.Timer = timer;
        }

        private IStoplightView view;

        public void SetView(IStoplightView view)
        {
            this.view = view;
            view.PropertyChanged += OnViewPropertyChanged;
            view.UpdateClicked += OnViewUpdateClicked;
            view.ForceChangeClicked += OnViewForceChangeClicked;

            if(Stoplight==null)
            {
                Stoplight = new Stoplight();
            }

            Stoplight.Changed += OnStoplightChanged;

            view.GreenDuration = "3000";
            view.YellowDuration = "4000";
            view.RedDuration = "5000";
            view.CurrentColor = Color.Green;

            if (Schedule == null)
            {
                Schedule = new StoplightSchedule(Timer);
                Schedule.ChangeLight += OnScheduledLightChange;
            }
            Schedule.Update(TimeSpan.FromMilliseconds(3000),
                         TimeSpan.FromMilliseconds(4000),
                         TimeSpan.FromMilliseconds(5000));

            Schedule.Start();
        }

        public void OnScheduledLightChange(object sender, EventArgs e)
        {
            Stoplight.Next();
        }

        private void OnViewPropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            string newDurationValue = null;
            int newDurationInMilliseconds;

            if (e.PropertyName == StoplightViewProperties.CurrentColor)
            {
                return;
            }

            ActOnProperty(e.PropertyName,
                delegate { newDurationValue = view.GreenDuration; },
                delegate { newDurationValue = view.YellowDuration; },
                delegate { newDurationValue = view.RedDuration; });

            if (!int.TryParse(newDurationValue, out newDurationInMilliseconds))
            {
                MessageBox.Show("Duration must be an integer");
            }
            else
            {
            }
        }

        private delegate void Action();

        private void ActOnProperty(
            string propertyName, Action greenAction, Action yellowAction, Action redAction)
        {
            switch (propertyName)
            {
                case StoplightViewProperties.GreenDuration:
                    greenAction();
                    break;

                case StoplightViewProperties.YellowDuration:
                    yellowAction();
                    break;

                case StoplightViewProperties.RedDuration:
                    redAction();
                    break;

                case StoplightViewProperties.CurrentColor:
                    return;
            }
        }

        private void OnViewForceChangeClicked(object sender, EventArgs e)
        {
            Schedule.ForceChange();
        }

        private void OnViewUpdateClicked(object sender, EventArgs e)
        {
            string[] durationsAsString = new string[3];
            List<string> propNames = new List<string>(new string[]
            {
                StoplightViewProperties.GreenDuration,
                StoplightViewProperties.YellowDuration,
                StoplightViewProperties.RedDuration
            });

            foreach (string propName in propNames)
            {
                ActOnProperty(propName,
                delegate { durationsAsString[0] = view.GreenDuration; },
                delegate { durationsAsString[1] = view.YellowDuration; },
                delegate { durationsAsString[2] = view.RedDuration; }
                );
            }

            TimeSpan[] timeSpans = Array.ConvertAll<string, TimeSpan>(durationsAsString,
            delegate(string s)
            {
                return
                TimeSpan.FromMilliseconds(
                int.Parse(s));
            });
            Schedule.Update(timeSpans[0], timeSpans[1], timeSpans[2]);

        }

        private void OnStoplightChanged(object sender, LightChangedEventArgs e)
        {
            switch (e.CurrentColor)
            {
                case StoplightColors.Green:
                    view.CurrentColor = Color.Green;
                    break;

                case StoplightColors.Yellow:
                    view.CurrentColor = Color.Yellow;
                    break;

                case StoplightColors.Red:
                    view.CurrentColor = Color.Red;
                    break;
            }
        }

    }

——————————————————————————————————————————

 public class StoplightSchedule
    {
        private Timer timer;
        private TimeSpan[] lightTimes = new TimeSpan[3];
        private int currentLight = 0;

        public event EventHandler ChangeLight;

        public StoplightSchedule(Timer timer)
        {
            this.timer = timer;
            this.timer.Tick += OnClick;
        }

        public void Start()
        {
            timer.Start();
        }

        public void Update(TimeSpan green, TimeSpan yellow, TimeSpan red)
        {
            lightTimes[0] = green;
            lightTimes[1] = yellow;
            lightTimes[2] = red;
        }

        public void ForceChange()
        {
            OnTimerExpired(this, EventArgs.Empty);
        }

        public void OnTimerExpired(object sender, EventArgs e)
        {
            EventHandler handlers = ChangeLight;
            if (handlers != null)
            {
                handlers(this, EventArgs.Empty);
            }

            currentLight = (currentLight + 1) % 3;
            timer.Interval = (int)lightTimes[0].TotalMilliseconds;

            timer.Start();
        }

        private void OnClick(object sender, EventArgs e)
        {
            timer.Stop();

            OnTimerExpired(sender, e);
        }
    }

——————————————————————————————————————————

 public class StoplightForm : Form, IStoplightView
    {
        #region Designer.cs
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.components = new System.ComponentModel.Container();
            this.stopLightPanel = new System.Windows.Forms.Panel();
            this.label1 = new System.Windows.Forms.Label();
            this.label2 = new System.Windows.Forms.Label();
            this.label3 = new System.Windows.Forms.Label();
            this.greenDurationTextBox = new System.Windows.Forms.TextBox();
            this.yellowDurationTextBox = new System.Windows.Forms.TextBox();
            this.redDurationTextBox = new System.Windows.Forms.TextBox();
            this.updateScheduleButton = new System.Windows.Forms.Button();
            this.forceChangeButton = new System.Windows.Forms.Button();
            this.timer1 = new System.Windows.Forms.Timer(this.components);
            this.SuspendLayout();
            //
            // stopLightPanel
            //
            this.stopLightPanel.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
            this.stopLightPanel.Location = new System.Drawing.Point(45, 36);
            this.stopLightPanel.Name = "stopLightPanel";
            this.stopLightPanel.Size = new System.Drawing.Size(213, 30);
            this.stopLightPanel.TabIndex = 0;
            //
            // label1
            //
            this.label1.AutoSize = true;
            this.label1.Location = new System.Drawing.Point(42, 80);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(95, 12);
            this.label1.TabIndex = 1;
            this.label1.Text = "&Green Duration:";
            //
            // label2
            //
            this.label2.AutoSize = true;
            this.label2.Location = new System.Drawing.Point(42, 108);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(101, 12);
            this.label2.TabIndex = 3;
            this.label2.Text = "&Yellow Duration:";
            //
            // label3
            //
            this.label3.AutoSize = true;
            this.label3.Location = new System.Drawing.Point(42, 133);
            this.label3.Name = "label3";
            this.label3.Size = new System.Drawing.Size(83, 12);
            this.label3.TabIndex = 5;
            this.label3.Text = "&Red Duration:";
            //
            // greenDurationTextBox
            //
            this.greenDurationTextBox.Location = new System.Drawing.Point(131, 80);
            this.greenDurationTextBox.Name = "greenDurationTextBox";
            this.greenDurationTextBox.Size = new System.Drawing.Size(127, 21);
            this.greenDurationTextBox.TabIndex = 2;
            //
            // yellowDurationTextBox
            //
            this.yellowDurationTextBox.Location = new System.Drawing.Point(131, 105);
            this.yellowDurationTextBox.Name = "yellowDurationTextBox";
            this.yellowDurationTextBox.Size = new System.Drawing.Size(127, 21);
            this.yellowDurationTextBox.TabIndex = 4;
            //
            // redDurationTextBox
            //
            this.redDurationTextBox.Location = new System.Drawing.Point(131, 130);
            this.redDurationTextBox.Name = "redDurationTextBox";
            this.redDurationTextBox.Size = new System.Drawing.Size(127, 21);
            this.redDurationTextBox.TabIndex = 6;
            //
            // updateScheduleButton
            //
            this.updateScheduleButton.Location = new System.Drawing.Point(93, 174);
            this.updateScheduleButton.Name = "updateScheduleButton";
            this.updateScheduleButton.Size = new System.Drawing.Size(126, 21);
            this.updateScheduleButton.TabIndex = 7;
            this.updateScheduleButton.Text = "&Update Schedule";
            this.updateScheduleButton.UseVisualStyleBackColor = true;
            this.updateScheduleButton.Click += new System.EventHandler(this.OnUpdateScheduleClicked);
            //
            // forceChangeButton
            //
            this.forceChangeButton.Location = new System.Drawing.Point(93, 201);
            this.forceChangeButton.Name = "forceChangeButton";
            this.forceChangeButton.Size = new System.Drawing.Size(126, 21);
            this.forceChangeButton.TabIndex = 8;
            this.forceChangeButton.Text = "&Change Light";
            this.forceChangeButton.UseVisualStyleBackColor = true;
            this.forceChangeButton.Click += new System.EventHandler(this.OnChangeLightClicked);
            //
            // timer1
            //
            this.timer1.Enabled = true;
            this.timer1.Interval =100;
            //
            // StoplightForm
            //
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(312, 270);
            this.Controls.Add(this.forceChangeButton);
            this.Controls.Add(this.updateScheduleButton);
            this.Controls.Add(this.redDurationTextBox);
            this.Controls.Add(this.yellowDurationTextBox);
            this.Controls.Add(this.greenDurationTextBox);
            this.Controls.Add(this.label3);
            this.Controls.Add(this.label2);
            this.Controls.Add(this.label1);
            this.Controls.Add(this.stopLightPanel);
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
            this.Name = "StoplightForm";
            this.Text = "Stoplight Simulator";
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        #endregion

        private System.Windows.Forms.Panel stopLightPanel;
        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.Label label2;
        private System.Windows.Forms.Label label3;
        private System.Windows.Forms.TextBox greenDurationTextBox;
        private System.Windows.Forms.TextBox yellowDurationTextBox;
        private System.Windows.Forms.TextBox redDurationTextBox;
        private System.Windows.Forms.Button updateScheduleButton;
        private System.Windows.Forms.Button forceChangeButton;
        private Timer timer1;

        #endregion
       

        private StoplightPresenter presenter;

        public StoplightForm()
        {
            InitializeComponent();

            // 创建presenter层对象
            Presenter = new StoplightPresenter(this.timer1);
        }

        public StoplightPresenter Presenter
        {
            get { return presenter; }
            set
            {
                presenter = value;
                presenter.SetView(this);
            }
        }

        #region IStoplightView Members

        public Color CurrentColor
        {
            get { return stopLightPanel.BackColor; }
            set
            {
                stopLightPanel.BackColor = value;
                RaisePropertyChanged(StoplightViewProperties.CurrentColor);
            }
        }

        public string GreenDuration
        {
            get { return greenDurationTextBox.Text; }
            set
            {
                greenDurationTextBox.Text = value;
                RaisePropertyChanged(StoplightViewProperties.GreenDuration);
            }
        }

        public string YellowDuration
        {
            get { return yellowDurationTextBox.Text; }
            set
            {
                yellowDurationTextBox.Text = value;
                RaisePropertyChanged(StoplightViewProperties.YellowDuration);
            }
        }

        public string RedDuration
        {
            get { return redDurationTextBox.Text; }
            set
            {
                redDurationTextBox.Text = value;
                RaisePropertyChanged(StoplightViewProperties.RedDuration);
            }
        }

        public event EventHandler UpdateClicked;

        public event EventHandler ForceChangeClicked;

        public void SetError(string propertyName, string errorMessage)
        {
            Dictionary<string, Control> controlsByName = new Dictionary<string, Control>();
            controlsByName.Add(StoplightViewProperties.GreenDuration, greenDurationTextBox);
            controlsByName.Add(StoplightViewProperties.YellowDuration, yellowDurationTextBox);
            controlsByName.Add(StoplightViewProperties.RedDuration, redDurationTextBox);
        }

        #endregion

        #region INotifyPropertyChanged Members

        public event PropertyChangedEventHandler PropertyChanged;

        #endregion

        // Event firing helpers

        protected virtual void RaisePropertyChanged(string propertyName)
        {
            PropertyChangedEventHandler handlers = PropertyChanged;
            if (handlers != null)
            {
                handlers(this, new PropertyChangedEventArgs(propertyName));
            }
        }

        protected virtual void RaiseUpdateClicked()
        {
            EventHandler handlers = UpdateClicked;
            if (handlers != null)
            {
                handlers(this, EventArgs.Empty);
            }
        }

        protected virtual void RaiseForceChangeClicked()
        {
            EventHandler handlers = ForceChangeClicked;
            if (handlers != null)
            {
                handlers(this, EventArgs.Empty);
            }
        }

        private void OnUpdateScheduleClicked(object sender, EventArgs e)
        {
            RaiseUpdateClicked();
        }

        private void OnChangeLightClicked(object sender, EventArgs e)
        {
            RaiseForceChangeClicked();
        }

    }

————————————————————————————————————

 static class Program
    {
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);

            Application.Run(new StoplightForm());
        }
    }

代码粘贴结束了,考察一下您的眼力啦,呵呵......