First commit

Editor/Views/GraphToolbarView.cs

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+using System;
+using UnityEditor;
+using UnityEditor.UIElements;
+using UnityEngine;
+using UnityEngine.UIElements;
+
+namespace Misaki.GraphView.Editor
+{
+    public class GraphToolbarView : Toolbar
+    {
+        private readonly GraphObject _graphObject;
+        
+        private readonly ToolbarMenu _assetActionMenu = new();
+        private readonly ToolbarButton _saveButton = new();
+        
+        private readonly ToolbarButton _executeButton = new();
+        
+        private readonly VisualElement _customElementContainer = new ();
+        
+        private readonly ToolbarButton _blackboardButton = new();
+        private readonly ToolbarButton _inspectorButton = new();
+        
+        public Action BlackboardButtonClicked;
+        public Action InspectButtonClicked;
+        
+        public GraphToolbarView(GraphObject graphObject)
+        {
+            _graphObject = graphObject;
+            
+            _saveButton.iconImage = new () {texture = (Texture2D)EditorGUIUtility.IconContent("SaveAs").image};
+            _saveButton.tooltip = "Save";
+            _saveButton.clicked += SaveAsset;
+            _saveButton.style.borderRightWidth = 0;
+            
+            _assetActionMenu.tooltip = "Asset Actions";
+            _assetActionMenu.menu.AppendAction("Save As", a => SaveAsAsset());
+            _assetActionMenu.menu.AppendAction("Select Asset", a => Selection.activeObject = _graphObject);
+            _assetActionMenu.style.borderLeftWidth = 0;
+            
+            _executeButton.iconImage = new () {texture = (Texture2D)EditorGUIUtility.IconContent("PlayButton").image};
+            _executeButton.tooltip = "Execute";
+            _executeButton.clicked += () => _graphObject.Execute();
+            
+            _customElementContainer.style.flexGrow = 1;
+            
+            _blackboardButton.iconImage = new () {texture = (Texture2D)EditorGUIUtility.IconContent("Audio Mixer").image};
+            _blackboardButton.tooltip = "Blackboard";
+            _blackboardButton.clicked += () => BlackboardButtonClicked?.Invoke();
+            
+            _inspectorButton.iconImage = new () {texture = (Texture2D)EditorGUIUtility.IconContent("UnityEditor.InspectorWindow").image};
+            _inspectorButton.tooltip = "Inspector";
+            _inspectorButton.clicked += () => InspectButtonClicked?.Invoke();
+            
+            Add(_saveButton);
+            Add(CreateSmallSplitter());
+            Add(_assetActionMenu);
+            Add(new ToolbarSpacer());
+            Add(_executeButton);
+            
+            Add(_customElementContainer);
+            
+            Add(_blackboardButton);
+            Add(_inspectorButton);
+        }
+
+        private void SaveAsset()
+        {
+            AssetDatabase.SaveAssetIfDirty(_graphObject);
+        }
+        
+        private void SaveAsAsset()
+        {
+            var path = EditorUtility.SaveFilePanelInProject("Save Graph", "NewGraph", "asset", "Save Graph");
+            if (string.IsNullOrEmpty(path))
+            {
+                return;
+            }
+            
+            AssetDatabase.CreateAsset(_graphObject, path);
+            AssetDatabase.SaveAssets();
+            AssetDatabase.Refresh();
+        }
+        
+        public static VisualElement CreateSmallSplitter()
+        {
+            var splitter = new VisualElement()
+            {
+                style =
+                {
+                    marginTop = 4,
+                    marginBottom = 4,
+                    backgroundColor = new Color(0.15f, 0.15f, 0.15f),
+                    width = 2
+                }
+            };
+            
+            return splitter;
+        }
+
+        public void SetCustomElement(VisualElement element)
+        {
+            _customElementContainer.Clear();
+            _customElementContainer.Add(element);
+        }
+    }
+}