0.6.0: Added ui layer and canvas picker

Editor/Toolbar/Tools/ToolUILayerToggle.cs

@@ -0,0 +1,47 @@
+using Game.NavigationTool.Editor.Toolbar;
+using JetBrains.Annotations;
+using UnityEditor;
+using UnityEngine;
+using UTools = UnityEditor.Tools;
+
+namespace Game.NavigationTool.Editor.Tools
+{
+    [UsedImplicitly]
+    internal sealed class ToolUILayerToggle : IToolbarDrawer
+    {
+        public bool Visible => true;
+        public bool Enabled => !EditorApplication.isPlayingOrWillChangePlaymode;
+        public EToolbarPlacement Placement => EToolbarPlacement.Left;
+        
+        public void Update()
+        {
+        }
+
+        public void Draw(Rect rect, Styles styles)
+        {
+            int layer = 1 << LayerMask.NameToLayer("UI");
+            bool value = (UTools.visibleLayers & layer) != 0;
+            bool temp = EditorGUI.Toggle(rect, value, styles.button);
+            GUI.Label(rect, "UI", styles.labelCenter);
+
+            if (temp == value)
+                return;
+            
+            if (temp)
+            {
+                UTools.visibleLayers |= layer;
+                SceneView.RepaintAll();
+            }
+            else
+            {
+                UTools.visibleLayers &= ~layer;
+                SceneView.RepaintAll();
+            }
+        }
+
+        public float CalculateWidth()
+        {
+            return 30.0f;
+        }
+    }
+}