feat(behavior-tree): runtime trees can now be visually printed

Author: ashblue

Assets/FluidBehaviorTree/Editor.meta

@@ -0,0 +1,21 @@
+using UnityEditor;
+using UnityEngine;
+
+namespace CleverCrow.Fluid.BTs.Trees.Editors {
+    [CustomPropertyDrawer(typeof(BehaviorTree))]
+    public class BehaviorTreeDrawer : PropertyDrawer {
+        public override void OnGUI (Rect position, SerializedProperty property, GUIContent label) {
+            EditorGUI.BeginProperty(position, label, property);
+            
+            position = EditorGUI.PrefixLabel(position, GUIUtility.GetControlID(FocusType.Passive), label);
+            GUI.enabled = Application.isPlaying;
+            if (GUI.Button(position, "View Tree")) {
+                var tree = fieldInfo.GetValue(property.serializedObject.targetObject) as IBehaviorTree;
+                BehaviorTreeWindow.ShowTree(tree, property.displayName);
+            }
+            GUI.enabled = true;
+            
+            EditorGUI.EndProperty();
+        }
+    }
+}

Assets/FluidBehaviorTree/Editor/BehaviorTree.meta

@@ -0,0 +1,24 @@
+using UnityEditor;
+using UnityEngine;
+
+namespace CleverCrow.Fluid.BTs.Trees.Editors {
+    public class BehaviorTreeWindow : EditorWindow {
+        private BehaviorTreePrinter _printer;
+        private string _name;
+        
+        public static void ShowTree (IBehaviorTree tree, string name) {
+            var window = GetWindow(typeof(BehaviorTreeWindow)) as BehaviorTreeWindow;
+            window.SetTree(tree, name);
+        }
+
+        private void SetTree (IBehaviorTree tree, string name) {
+            _printer = new BehaviorTreePrinter(tree);
+            _name = name;
+        }
+
+        private void OnGUI () {
+            GUILayout.Label($"Behavior Tree: {_name}", EditorStyles.boldLabel);
+            _printer?.Print();
+        }
+    }
+}

Assets/FluidBehaviorTree/Editor/BehaviorTree/BehaviorTreeDrawer.cs

@@ -0,0 +1,13 @@
+namespace CleverCrow.Fluid.BTs.Trees.Editors {
+    public class BehaviorTreePrinter {
+        private readonly PrintNode _root;
+        
+        public BehaviorTreePrinter (IBehaviorTree tree) {
+            _root = new PrintNode(tree.Root);
+        }
+
+        public void Print () {
+            _root.Print();
+        }
+    }
+}

Assets/FluidBehaviorTree/Editor/BehaviorTree/BehaviorTreeDrawer.cs.meta

@@ -0,0 +1,39 @@
+using System.Collections.Generic;
+using CleverCrow.Fluid.BTs.TaskParents;
+using CleverCrow.Fluid.BTs.Tasks;
+using UnityEngine;
+using EditorGUILayout = UnityEditor.EditorGUILayout;
+
+namespace CleverCrow.Fluid.BTs.Trees.Editors {
+    public class PrintNode {
+        private readonly ITask _task;
+        private readonly List<PrintNode> _children = new List<PrintNode>();
+        
+        public PrintNode (ITask task) {
+            _task = task;
+
+            var parent = task as ITaskParent;
+            if (parent == null) return;
+            foreach (var child in parent.Children) {
+                _children.Add(new PrintNode(child));
+            }
+        }
+
+        public void Print () {
+            EditorGUILayout.BeginVertical();
+            
+            var centeredStyle = GUI.skin.GetStyle("Label");
+            centeredStyle.alignment = TextAnchor.MiddleCenter;
+            EditorGUILayout.LabelField(_task.Name, centeredStyle);
+
+            EditorGUILayout.BeginHorizontal();
+            foreach (var child in _children) {
+                child.Print();
+            }
+            EditorGUILayout.EndHorizontal();
+            
+            EditorGUILayout.EndVertical();
+
+        }
+    }
+}

Assets/FluidBehaviorTree/Editor/BehaviorTree/BehaviorTreeWindow.cs

@@ -0,0 +1,12 @@
+{
+    "name": "Fluid.BehaviorTree.Editor",
+    "references": [
+        "Fluid.BehaviorTree"
+    ],
+    "optionalUnityReferences": [],
+    "includePlatforms": [
+        "Editor"
+    ],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false
+}

Assets/FluidBehaviorTree/Editor/BehaviorTree/BehaviorTreeWindow.cs.meta

@@ -3,7 +3,12 @@
 using UnityEngine;
 
 namespace CleverCrow.Fluid.BTs.Trees {
-    public class BehaviorTree {
+    public interface IBehaviorTree {
+        TaskRoot Root { get; }
+    }
+    
+    [System.Serializable]
+    public class BehaviorTree : IBehaviorTree {
         private readonly GameObject _owner;
 
         public int TickCount { get; private set; }

Assets/FluidBehaviorTree/Editor/BehaviorTree/Printer.meta

@@ -0,0 +1,28 @@
+using CleverCrow.Fluid.BTs.Tasks;
+using CleverCrow.Fluid.BTs.Trees;
+using UnityEngine;
+
+namespace FluidBehaviorTree.Runtime {
+    public class BehaviorTreeSerializationTestDeleteMe : MonoBehaviour {
+        [SerializeField] 
+        private BehaviorTree _tree;
+    
+        private void Awake () {
+            _tree = new BehaviorTreeBuilder(gameObject)
+                .Sequence()
+                    .Condition("Custom Condition", () => true)
+                    .Do("Custom Action", () => TaskStatus.Success)
+                    .Sequence("Nested Sequence")
+                        .Condition("Custom Condition", () => true)
+                        .Do("Custom Action", () => TaskStatus.Success)
+                    .End()
+                .End()
+                .Build();
+        }
+
+        private void Update () {
+            // Update our tree every frame
+            _tree.Tick();
+        }
+    }
+}

Assets/FluidBehaviorTree/Editor/BehaviorTree/Printer/BehaviorTreePrinter.cs

@@ -8,7 +8,7 @@ public abstract class TaskParentBase : ITaskParent {
         public BehaviorTree ParentTree { get; set; }
         public TaskStatus LastStatus { get; private set; }
 
-        public string Name { get; set; }
+        public virtual string Name { get; set; }
         public bool Enabled { get; set; } = true;
 
         public List<ITask> Children { get; } = new List<ITask>();

Assets/FluidBehaviorTree/Editor/BehaviorTree/Printer/BehaviorTreePrinter.cs.meta

@@ -2,6 +2,7 @@
 
 namespace CleverCrow.Fluid.BTs.TaskParents {
     public class TaskRoot : TaskParentBase {
+        public override string Name { get; set; } = "Root";
         protected override int MaxChildren { get; } = 1;
 
         protected override TaskStatus OnUpdate () {