Новая логика управления процедурой. Теперь главная модель реализует интерфейс ICommand.

Signal Generator/AddSignalWindow.xaml.cs

@@ -22,6 +22,7 @@ namespace Signal_Generator
     {
         ObservableCollection<Parameter> signalProps = new ObservableCollection<Parameter>();
         ObservableCollection<IAnalogSignal> typesOfSignal = new ObservableCollection<IAnalogSignal>();
+
         public AddSignalWindow()
         {
             InitializeComponent();

Signal Generator/DrawTask.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.ComponentModel;
 using System.Diagnostics;
 using System.Linq;
 using System.Text;
@@ -12,31 +13,47 @@ using System.Windows.Shapes;
 
 namespace Signal_Generator
 {
-    public class DrawTask : Task
+    public class DrawTask : Task, INotifyPropertyChanged
     {
-        Canvas currentCanvas;
+        Canvas canvas;
         System.Timers.Timer taskTimer;
         Stopwatch stopwatch = new Stopwatch();
-        MultiSignal currentMultiSignal;
-        public DStatus dStatus;
-        public enum DStatus
+        MultiSignal multiSignal;
+
+        private State _state;
+        public State state
+        {
+            get { return _state; }
+            set
+            {
+                _state = value;
+                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("state"));
+            }
+        }
+
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        public enum State
         {
             Created, Running, Paused, Finished, Canceled
         }
 
         public DrawTask(Action a) : base(a) { }
 
-        public void buildTask(MultiSignal s, Canvas c)
+        public void buildTask(Canvas c)
         {
-            currentCanvas = c;
-            currentMultiSignal = s;
-            dStatus = DStatus.Running;
-            drawSignalAtCanvas();
+            canvas = c;
+            multiSignal = MultiSignal.getInstance();
+            state = State.Running;
+
             stopwatch.Start();
             taskTimer = new System.Timers.Timer(2000);
             taskTimer.Elapsed += updateTextForms;
             taskTimer.Enabled = true;
+
+            drawSignalAtCanvas();
         }
+        
 
         private void updateTextForms(object sender, ElapsedEventArgs e)
         {
@@ -46,24 +63,24 @@ namespace Signal_Generator
         private void drawSignalAtCanvas()
         {
             double lastX = 0, lastY = 0;
-            double w = currentCanvas.ActualWidth;
+            double w = canvas.ActualWidth;
             for (int i = 0; i != (int)w; i++)
             {
-                double y = currentMultiSignal.currentAmplitude(i / 5.0);
+                double y = multiSignal.currentAmplitude(i / 5.0);
                 drawLine(lastX, lastY, i, y);
                 lastX = i;
                 lastY = y;
                 Thread.Sleep(10);
-                switch (dStatus)
+                switch (state)
                 {
-                    case DStatus.Paused:
-                        while (dStatus == DStatus.Paused)
+                    case State.Paused:
+                        while (state == State.Paused)
                             Thread.Sleep(10);
                         break;
-                    case DStatus.Canceled: return;
+                    case State.Canceled: return;
                 }
             }
-            dStatus = DStatus.Finished;
+            state = State.Finished;
         }
 
         private void drawLine(double x1, double y1, double x2, double y2)
@@ -76,14 +93,14 @@ namespace Signal_Generator
                 l.Y1 = remap(y1);
                 l.X2 = x2;
                 l.Y2 = remap(y2);
-                currentCanvas.Children.Add(l);
+                canvas.Children.Add(l);
             };
-            currentCanvas.Dispatcher.Invoke(a);
+            canvas.Dispatcher.Invoke(a);
         }
 
         private double remap(double x, double oldMin = -100.0, double oldMax = 100.0, double newMin = 100.0, double newMax = 0.0)
         {
-            newMin = currentCanvas.ActualHeight;
+            newMin = canvas.ActualHeight;
             return newMin + (x - oldMin) * (newMax - newMin) / (oldMax - oldMin);
         }
     }

Signal Generator/MainWindow.xaml.cs

@@ -56,16 +56,15 @@ namespace Signal_Generator
             addSignalWindow_Instance.Close();
         }  
 
-
         private void startProcedure_Button_Click(object sender, RoutedEventArgs e)
         {
             IsEnabled = false;
-            MultiSignal ms = new MultiSignal();
+            MultiSignal ms = MultiSignal.getInstance();
             foreach (IAnalogSignal item in signalCollection)
             {
                 ms.add(item);
             }
-            taskWindow_Instance = new TaskWindow(ms);
+            taskWindow_Instance = new TaskWindow();
             taskWindow_Instance.Show();
             taskWindow_Instance.Closed += enableMainWindow;
         }

Signal Generator/ProcedureModel.cs

@@ -0,0 +1,145 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Diagnostics;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Input;
+
+namespace Signal_Generator
+{
+    public class ProcedureModel : ICommand
+    {
+        public DrawTask currentTask;
+        Canvas targetCanvas;
+
+        public ProcedureModel()
+        {
+        }
+
+        public event EventHandler CanExecuteChanged;
+        
+        public void RaiseCanExecuteChanged()
+        {
+            CanExecuteChanged?.Invoke(this, new EventArgs());
+        }
+
+        private void RaiseCanExecuteChanged(object o, PropertyChangedEventArgs e)
+        {
+            Action a = () =>
+            {
+                RaiseCanExecuteChanged();
+            };
+            targetCanvas.Dispatcher.Invoke(a);
+        }
+
+        public bool CanExecute(object parameter)
+        {
+            if (parameter == null) return false;
+            var parameters = parameter as object[];
+            var btn = parameters[0] as Button;
+            var ms = MultiSignal.getInstance();
+
+            if ((ms == null) && (ms.count() == 0))
+                return false;
+            switch (btn.Name)
+            {
+                case "start_Button":
+                    btn.Content = updateStartButtonContent();
+                    return true;
+                default:
+                    btn.Content = updatePauseButtonContent().Item2;
+                    if (!updatePauseButtonContent().Item1)
+                        return false;
+                    return true;
+            }
+        }
+
+        private string updateStartButtonContent()
+        {
+            if (currentTask == null) return "Запустить";
+            switch (currentTask.state)
+            {
+                case DrawTask.State.Created:
+                    return "Запустить";
+                case DrawTask.State.Running:
+                    return "Завершить";
+                case DrawTask.State.Paused:
+                    goto case DrawTask.State.Running;
+                default:
+                    goto case DrawTask.State.Created;
+            }
+        }
+
+        private Tuple<bool, string> updatePauseButtonContent()
+        {
+            if (currentTask == null) return new Tuple<bool, string>(false, "Пауза");
+            switch (currentTask.state)
+            {
+                case DrawTask.State.Created:
+                    return new Tuple<bool, string>(false, "Пауза");
+                case DrawTask.State.Running:
+                    return new Tuple<bool, string>(true, "Пауза");
+                case DrawTask.State.Paused:
+                    return new Tuple<bool, string>(true, "Возобновить");
+                default:
+                    goto case DrawTask.State.Created;
+            }
+        }
+
+        public void Execute(object parameter)
+        {
+            var parameters = parameter as object[];
+            var btn = parameters[0] as Button;
+            targetCanvas = parameters[1] as Canvas;
+            
+            switch (btn.Name)
+            {
+                case "start_Button":
+                    startOrCancelTask();
+                    break;
+                case "pause_Button":
+                    pauseOrResumeTask();
+                    break;
+            }
+
+        }
+
+        private void startOrCancelTask ()
+        {
+            targetCanvas.Children.Clear();
+            if (currentTask != null)
+                switch (currentTask.state)
+                {
+                    case DrawTask.State.Paused:
+                        goto case DrawTask.State.Running;
+                    case DrawTask.State.Running:
+                        currentTask.state = DrawTask.State.Canceled;
+                        return;
+                }
+            Action newAction = () =>
+            {
+                currentTask.PropertyChanged += RaiseCanExecuteChanged;
+                currentTask.buildTask(targetCanvas);
+            };
+            currentTask = new DrawTask(newAction);
+            currentTask.Start();
+        }
+
+        private void pauseOrResumeTask()
+        {
+            switch (currentTask.state)
+            {
+                case DrawTask.State.Paused:
+                    currentTask.state = DrawTask.State.Running;
+                    break;
+                case DrawTask.State.Running:
+                    currentTask.state = DrawTask.State.Paused;
+                    break;
+            }
+        }
+    }
+}

Signal Generator/Signal Generator.csproj

@@ -59,11 +59,13 @@
       <DependentUpon>AddSignalWindow.xaml</DependentUpon>
     </Compile>
     <Compile Include="DrawTask.cs" />
+    <Compile Include="ProcedureModel.cs" />
     <Compile Include="Signal\Base\AnalogSignalMethods.cs" />
     <Compile Include="Signal\FmSignal.cs" />
     <Compile Include="Settings.cs" />
     <Compile Include="Signal\Base\Parameter.cs" />
     <Compile Include="Signal\SinusoidalSignal.cs" />
+    <Compile Include="TaskViewConverter.cs" />
     <Compile Include="TaskWindow.xaml.cs">
       <DependentUpon>TaskWindow.xaml</DependentUpon>
     </Compile>

Signal Generator/Signal/MultiSignal.cs

@@ -9,13 +9,21 @@ namespace Signal_Generator
 {
     public class MultiSignal : IAnalogSignal
     {
+        private static MultiSignal instance;
         private List<IAnalogSignal> signals { get; set; }
 
-        public MultiSignal()
+        private MultiSignal()
         {
             signals = new List<IAnalogSignal>();
         }
 
+        public static MultiSignal getInstance()
+        {
+            if (instance == null)
+                instance = new MultiSignal();
+            return instance;
+        }
+
         internal void add(IAnalogSignal signal)
         {
             signals.Add(signal);
@@ -26,6 +34,11 @@ namespace Signal_Generator
             signals.Remove(signal);
         }
 
+        internal int count()
+        {
+            return signals.Count();
+        }
+
         public double currentAmplitude(double t)
         {
             double summaryAmplitude = 0;
@@ -39,13 +52,9 @@ namespace Signal_Generator
         // Неиспользуемые поля и методы
 
         public string typeToString => throw new NotImplementedException();
-
         string IAnalogSignal.paramsToString => throw new NotImplementedException();
-
         string IAnalogSignal.typeToString => throw new NotImplementedException();
-
         Collection<Parameter> IAnalogSignal.paramsCollection { get => throw new NotImplementedException(); set => throw new NotImplementedException(); }
-
         double IAnalogSignal.currentAmplitude(double t)
         {
             throw new NotImplementedException();

Signal Generator/TaskViewConverter.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Controls;
+using System.Windows.Data;
+
+namespace Signal_Generator
+{
+    class ArrayConverter : IMultiValueConverter
+    {
+        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
+        {
+            return values.Clone();
+        }
+
+        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}

Signal Generator/TaskWindow.xaml

@@ -1,4 +1,5 @@
 <Window x:Class="Signal_Generator.TaskWindow"
+        x:Name="TaskWindowView"
         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"
@@ -7,7 +8,12 @@
         mc:Ignorable="d"
         Title="Моделирование работы группы сигналов" Height="250" Width="500"
         ResizeMode="NoResize">
-    <Grid Margin="10">
+    <Window.Resources>
+        <local:ProcedureModel x:Key="ProcedureModel"/>
+        <local:ArrayConverter x:Key="ArrayConverter"/>
+    </Window.Resources>
+
+    <Grid Margin="10" Loaded="Grid_Loaded">
         <Grid.RowDefinitions>
             <RowDefinition Height="*"/>
             <RowDefinition Height="Auto"/>
@@ -27,8 +33,22 @@
         <TextBlock x:Name="currentAmplitude_TextBlock" Margin="0,0,5,5" Grid.Row="2" Grid.Column="1">Текущий сигнал:</TextBlock>
         <TextBox x:Name="currentAmplitude_TextBox"  Margin="0,0,0,5" Grid.Row="2" Grid.Column="2"/>
         <Button x:Name="start_Button" Width="120" Content="Запустить" Margin="5,0" Grid.Row="3" Grid.Column="0" 
-                Grid.ColumnSpan="2" Click="start_Button_Click"/>
+                Grid.ColumnSpan="2" Command="{StaticResource ProcedureModel}">
+            <Button.CommandParameter>
+                <MultiBinding Converter="{StaticResource ArrayConverter}">
+                    <Binding ElementName="start_Button"/>
+                    <Binding ElementName="signalGraph_Canvas"/>
+                </MultiBinding>
+            </Button.CommandParameter>
+        </Button>
         <Button x:Name="pause_Button" Width="120" Content="Приостановить" Margin="5,0" Grid.Row="3" Grid.Column="2" 
-                Grid.ColumnSpan="2" Click="pause_Button_Click"/>
+                Grid.ColumnSpan="2" Command="{StaticResource ProcedureModel}">
+            <Button.CommandParameter>
+                <MultiBinding Converter="{StaticResource ArrayConverter}">
+                    <Binding ElementName="pause_Button"/>
+                    <Binding ElementName="signalGraph_Canvas"/>
+                </MultiBinding>
+            </Button.CommandParameter>
+        </Button>
     </Grid>
 </Window>

Signal Generator/TaskWindow.xaml.cs

@@ -23,47 +23,15 @@ namespace Signal_Generator
 
     public partial class TaskWindow : Window
     {
-        MultiSignal currentMultiSignal;
-        DrawTask currentTask;
-
-        public TaskWindow(MultiSignal s)
+        public TaskWindow()
         {
             InitializeComponent();
-            currentMultiSignal = s;
-        }
-
-        private void start_Button_Click(object sender, RoutedEventArgs e)
-        {
-            signalGraph_Canvas.Children.Clear();
-            if (currentTask != null)
-                switch (currentTask.dStatus)
-                {
-                    case DrawTask.DStatus.Paused:
-                        goto case DrawTask.DStatus.Running;
-                    case DrawTask.DStatus.Running:
-                        currentTask.dStatus = DrawTask.DStatus.Canceled;
-                        break;
-                }
-            Action newAction = () =>
-            {
-                currentTask.buildTask(currentMultiSignal, signalGraph_Canvas);
-            };
-            currentTask = new DrawTask(newAction);
-            currentTask.Start();
         }
 
-        private void pause_Button_Click(object sender, RoutedEventArgs e)
+        private void Grid_Loaded(object sender, RoutedEventArgs e)
         {
-            switch (currentTask.dStatus) {
-                case DrawTask.DStatus.Paused:
-                    currentTask.dStatus = DrawTask.DStatus.Running;
-                    pause_Button.Content = "Приостановить";
-                    break;
-                case DrawTask.DStatus.Running:
-                    currentTask.dStatus = DrawTask.DStatus.Paused;
-                    pause_Button.Content = "Возобновить";
-                    break;
-            }
+            // принудительное обновление 
+            ((ProcedureModel)Resources["ProcedureModel"]).RaiseCanExecuteChanged();
         }
     }
 }