first commit

Yapper/MVVM/Core/RelayCommand.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Controls.Primitives;
+using System.Windows.Input;
+
+namespace YapperClient.MVVM.Core
+{
+    class RelayCommand : ICommand
+    {
+        private Action<object> execute;
+        private Func<object, bool> canExecute;
+
+        public event EventHandler CanExecuteChanged
+        {
+            add { CommandManager.RequerySuggested += value; }
+            remove {  CommandManager.RequerySuggested -= value;}
+        }
+
+        public RelayCommand(Action<object> execute, Func<object, bool> canExecute = null)
+        {
+            this.execute = execute;
+            this.canExecute = canExecute;
+        }
+
+        public bool CanExecute(object parameter)
+        {
+            return this.canExecute == null || this.canExecute(parameter);
+        }
+
+        public void Execute(object parameter)
+        {
+            this.execute(parameter);
+        }
+    }
+}

Yapper/MVVM/Model/UserModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace YapperClient.MVVM.Model
+{
+    class UserModel
+    {
+        public string UserName { get; set; }
+        public string UID { get; set; }
+    }
+}

Yapper/MVVM/View/MainWindow.xaml

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+<Window x:Class="Yapper.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:Yapper"
+        xmlns:viewmodel="clr-namespace:YapperClient.MVVM.ViewModel"
+        mc:Ignorable="d"
+        Title="MainWindow" Height="450" Width="800">
+
+    <Window.DataContext>
+        <viewmodel:MainViewModel/>
+    </Window.DataContext>
+    
+    
+    <Grid>
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition Width="200"/>
+            <ColumnDefinition />
+        </Grid.ColumnDefinitions>
+
+        <DockPanel>
+            <TextBox Height="25"
+                     DockPanel.Dock="Top"
+                     Text="{Binding UserName, UpdateSourceTrigger=PropertyChanged}"
+                     />
+            <Button Height="25"
+                    DockPanel.Dock="Top"
+                    Content="connect"
+                    Command="{Binding ConnectToServerCommand}"
+                    />
+            <ListView
+                ItemsSource="{Binding Users}"
+                >
+                <ListView.ItemTemplate>
+                    <DataTemplate>
+                        <TextBlock Text="{Binding UserName}"/>
+                    </DataTemplate>
+                </ListView.ItemTemplate>
+            </ListView>
+        </DockPanel>
+
+        <StackPanel Grid.Column="1">
+            <ListView Height="380"></ListView>
+
+            <StackPanel Orientation="Horizontal">
+                <TextBox Height="55" Width="545" VerticalContentAlignment="Center"></TextBox>
+                <Button Width="55" Content="send"/>
+            </StackPanel>
+            
+        </StackPanel>
+    </Grid>
+</Window>

Yapper/MVVM/View/MainWindow.xaml.cs

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+using System.Text;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace Yapper
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            InitializeComponent();
+        }
+    }
+}

Yapper/MVVM/ViewModel/MainViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using YapperClient.MVVM.Core;
+using YapperClient.MVVM.Model;
+using YapperClient.Net;
+
+namespace YapperClient.MVVM.ViewModel
+{
+    class MainViewModel
+    {
+        public ObservableCollection<UserModel> Users { get; set; }
+        public RelayCommand ConnectToServerCommand { get; set; }
+
+        public string UserName { get; set; }
+
+        private Server _server;
+        public MainViewModel() {
+            Users = new ObservableCollection<UserModel>();
+            _server = new Server();
+            _server.connectedEvent += UserConnected;
+            ConnectToServerCommand = new RelayCommand(o => _server.ConnectToServer(UserName), o => !string.IsNullOrEmpty(UserName));
+        }
+
+        private void UserConnected()
+        {
+            var user = new UserModel
+            {
+                UserName = _server.PacketReader.ReadMessage(),
+                UID = _server.PacketReader.ReadMessage(),
+            };
+
+            if (!Users.Any(x => x.UID == user.UID))
+            {
+                Application.Current.Dispatcher.Invoke(() => Users.Add(user));
+            }
+        }
+    }
+}