Added IExecutable and ISlotContainer interface.

Changed SlotContainerNode to ExecutableNode

Editor/Views/BaseClasses/GraphSubWindow.cs

@@ -0,0 +1,54 @@
+using UnityEditor.Experimental.GraphView;
+using UnityEngine;
+using UnityEngine.UIElements;
+
+namespace Misaki.GraphView.Editor
+{
+    public abstract class GraphSubWindow : GraphElement
+    {
+        private readonly VisualElement _contentContainer = new();
+        
+        private readonly Dragger _dragger = new();
+        private readonly ResizableElement _resizableElement = new();
+
+        protected GraphSubWindow()
+        {
+            style.position = Position.Absolute;
+            style.marginBottom = 0;
+            style.marginTop = 0;
+            style.marginLeft = 0;
+            style.marginRight = 0;
+            style.paddingBottom = 0;
+            style.paddingTop = 0;
+            style.paddingLeft = 0;
+            style.paddingRight = 0;
+            
+            _contentContainer.style.flexGrow = 1;
+            _contentContainer.pickingMode = PickingMode.Ignore;
+            
+            capabilities = Capabilities.Movable | Capabilities.Resizable;
+            
+            _dragger.clampToParentEdges = true;
+
+            hierarchy.Add(_contentContainer);
+            hierarchy.Add(_resizableElement);
+            
+            this.AddManipulator(_dragger);
+        }
+
+        public override VisualElement contentContainer => _contentContainer;
+
+        public override void SetPosition(Rect rect)
+        {
+            style.left = rect.x;
+            style.top = rect.y;
+            style.width = rect.width;
+            style.height = rect.height;
+        }
+        
+        public override Rect GetPosition()
+        {
+            return new Rect(resolvedStyle.left, resolvedStyle.top, resolvedStyle.width, resolvedStyle.height);
+        }
+    }
+}