Add project files.

Examples/Nodify.StateMachine/Converters/BlackboardKeyEditorConverter.cs

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+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Windows.Data;
+using System.Windows.Markup;
+
+namespace Nodify.StateMachine
+{
+    public class BlackboardKeyEditorConverter : MarkupExtension, IMultiValueConverter
+    {
+        public bool CanChangeInputType { get; set; }
+
+        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (values.Length >= 2 && values[0] is ICollection<BlackboardKeyViewModel> availableKeys && values[1] is BlackboardKeyViewModel target)
+            {
+                return new BlackboardKeyEditorViewModel
+                {
+                    AvailableKeys = availableKeys,
+                    Target = target,
+                    IsEditing = values.Length >= 3 && values[2] is bool b && b,
+                    CanChangeInputType = CanChangeInputType && (target.Type != BlackboardKeyType.Object || target.CanChangeType),
+                    CanChangeKeyType = target.CanChangeType
+                };
+            }
+
+            return values;
+        }
+
+        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+
+        public override object ProvideValue(IServiceProvider serviceProvider) => this;
+    }
+}

Examples/Nodify.StateMachine/Converters/ConnectorOffsetConverter.cs

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+using System;
+using System.Windows;
+using System.Globalization;
+using System.Windows.Data;
+
+namespace Nodify.StateMachine
+{
+    public class ConnectorOffsetConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            double offset = System.Convert.ToDouble(parameter);
+            if (value is Size s)
+            {
+                return new Size((s.Width + offset) / 2, (s.Height + offset) / 2);
+            }
+
+            return new Size(offset / 2, offset / 2);
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            double offset = System.Convert.ToDouble(parameter);
+            if (value is Size s)
+            {
+                return new Size((s.Width + offset) / 2, (s.Height + offset) / 2);
+            }
+
+            return new Size(offset / 2, offset / 2);
+        }
+    }
+}

Examples/Nodify.StateMachine/Converters/FilterBlackboardKeysConverter.cs

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+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Windows.Data;
+using System.Windows.Markup;
+
+namespace Nodify.StateMachine
+{
+    public class FilterBlackboardKeysConverter : MarkupExtension, IMultiValueConverter
+    {
+        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (values.Length >= 2 && values[0] is IEnumerable<BlackboardKeyViewModel> keys && values[1] is BlackboardKeyType filter)
+            {
+                return keys.Where(k => k.Type == filter || filter == BlackboardKeyType.Object);
+            }
+
+            return values;
+        }
+
+        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+
+        public override object ProvideValue(IServiceProvider serviceProvider) => this;
+    }
+}