0.5.0: Added toolbar with scene picker

Editor/Toolbar/Utilities/Styles.cs

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+using UnityEngine;
+
+namespace Game.NavigationTool.Editor.Toolbar
+{
+    public sealed class Styles
+    {
+        public GUIStyle popup;
+        public GUIStyle button;
+        public GUIStyle slider;
+        
+        private GUISkin skin;
+
+        public void Initialize(GUISkin skin)
+        {
+            if (this.skin == skin)
+                return;
+
+            this.skin = skin;
+            popup = skin.FindStyle("ToolbarPopup");
+            button = skin.FindStyle("ToolbarButtonFlat");
+            slider = skin.FindStyle("ToolbarSlider");
+            
+            // Available: ToolbarBoldLabel, ToolbarBottom, ToolbarButtonLeft, ToolbarButtonRight, ToolbarDropDown,
+            //            ToolbarLabel, ToolbarTextField, ...
+        }
+    }
+}

Editor/Toolbar/Utilities/Styles.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 179c3a6025164e1f94a944b7b903dd23
+timeCreated: 1615459188

Editor/Toolbar/Utilities/ToolbarUtility.cs

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+using System;
+using System.Collections.Generic;
+using UnityEngine;
+using System.Reflection;
+using System.Runtime.Serialization;
+using Object = UnityEngine.Object;
+
+#if UNITY_2019_1_OR_NEWER
+using UnityEngine.UIElements;
+#else
+using UnityEngine.Experimental.UIElements;
+#endif
+
+namespace Game.NavigationTool.Editor.Toolbar
+{
+    internal static class ToolbarUtility
+    {
+        public static void AddGuiListener(Action action)
+        {
+            Assembly assembly = typeof(UnityEditor.Editor).Assembly;
+            Type typeToolbar = assembly.GetType("UnityEditor.Toolbar");
+            Object[] toolbars = Resources.FindObjectsOfTypeAll(typeToolbar);
+            ScriptableObject so = toolbars.Length > 0 ? (ScriptableObject)toolbars[0] : null;
+            
+            if (so == null)
+                return;
+            
+            Type typeGuiView = assembly.GetType("UnityEditor.GUIView");
+
+            #if UNITY_2020_1_OR_NEWER
+		    Type typeWindowBackend = assembly.GetType("UnityEditor.IWindowBackend");
+		    PropertyInfo piWindowBackend = typeGuiView.GetProperty("windowBackend", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
+		    PropertyInfo piVisualTree = typeWindowBackend.GetProperty("visualTree", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
+            #else
+            PropertyInfo piVisualTree = typeGuiView.GetProperty("visualTree", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
+            #endif
+
+            if (piVisualTree == null)
+                return;
+            
+            FieldInfo fiImguiContainer = typeof(IMGUIContainer).GetField("m_OnGUIHandler", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
+
+            if (fiImguiContainer == null)
+                return;
+            
+            #if UNITY_2020_1_OR_NEWER
+			var windowBackend = piWindowBackend.GetValue(so);
+			var visualTree = (VisualElement)piVisualTree.GetValue(windowBackend, null);
+            #else
+            var visualTree = (VisualElement)piVisualTree.GetValue(so, null);
+            #endif
+                
+            var container = (IMGUIContainer)visualTree[0];
+            var handler = (Action)fiImguiContainer.GetValue(container);
+            handler -= action;
+            handler += action;
+            fiImguiContainer.SetValue(container, handler);
+        }
+
+        public static IToolbarDrawer[] GetAllDrawers()
+        {
+            Assembly[] assemblies = AppDomain.CurrentDomain.GetAssemblies();
+            Type iType = typeof(IToolbarDrawer);
+
+            var list = new List<IToolbarDrawer>(8);
+
+            for (var i = 0; i < assemblies.Length; i++)
+            {
+                Assembly assembly = assemblies[i];
+                Type[] types = assembly.GetTypes();
+
+                for (var j = 0; j < types.Length; j++)
+                {
+                    Type type = types[j];
+
+                    if (!type.IsAbstract && iType.IsAssignableFrom(type))
+                        list.Add((IToolbarDrawer)FormatterServices.GetUninitializedObject(type));
+                }
+            }
+            
+            return list.ToArray();
+        }
+    }
+}

Editor/Toolbar/Utilities/ToolbarUtility.cs.meta

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+guid: a557eb0c4731f0e4b93d7d9381f003c3
+MonoImporter:
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+  serializedVersion: 2
+  defaultReferences: []
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