From 49b25e755b70ec412feaaf0b898d6f7e09d2bea6 Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Tue, 28 Jun 2022 09:40:37 +0800
Subject: +node example

---
 .../Assets/UNEB/Utility/StateMachine.cs            | 300 +++++++++++++++++++++
 1 file changed, 300 insertions(+)
 create mode 100644 Other/NodeEditorExamples/Assets/UNEB/Utility/StateMachine.cs

(limited to 'Other/NodeEditorExamples/Assets/UNEB/Utility/StateMachine.cs')

diff --git a/Other/NodeEditorExamples/Assets/UNEB/Utility/StateMachine.cs b/Other/NodeEditorExamples/Assets/UNEB/Utility/StateMachine.cs
new file mode 100644
index 00000000..9c3a8992
--- /dev/null
+++ b/Other/NodeEditorExamples/Assets/UNEB/Utility/StateMachine.cs
@@ -0,0 +1,300 @@
+using UnityEngine;
+using System;
+using System.Collections.Generic;
+
+namespace Bonsai.Utility
+{
+    /// <summary>
+    /// A finite state machine.
+    /// </summary>
+    /// <typeparam name="T">The date type to be stored by the machine states.</typeparam>
+    public class StateMachine<T>
+    {
+        /// <summary>
+        /// An event that fires when the machine finishes transitioning to another state.
+        /// </summary>
+        public event Action OnStateChangedEvent = delegate { };
+
+        protected Dictionary<T, State> _states = new Dictionary<T, State>();
+
+        /// <summary>
+        /// Get all the state data.
+        /// </summary>
+        /// <returns></returns>
+        public IEnumerable<T> Data()
+        {
+            return _states.Keys;
+        }
+
+        protected State _currentState;
+
+        public State CurrentState
+        {
+            get { return _currentState; }
+        }
+
+        /// <summary>
+        /// Adds a state to the machine.
+        /// </summary>
+        /// <param name="data"></param>
+        public void AddState(T data)
+        {
+            var s = new State(data);
+            _states.Add(data, s); ;
+        }
+
+        public void AddState(State s)
+        {
+            _states.Add(s.Value, s);
+        }
+
+        public void AddTransition(State start, State end, Func<bool> condition, Func<bool> onMakingTransition)
+        {
+            var t = new Transition(condition);
+            t.onMakingTransition = onMakingTransition;
+
+            AddTransition(start, end, t);
+        }
+
+        public void AddTransition(State start, State end, Transition t)
+        {
+            start.Add(t);
+            t.SetNextState(end);
+        }
+
+        /// <summary>
+        /// Add a transition that goes from start to end state.
+        /// </summary>
+        /// <param name="start"></param>
+        /// <param name="end"></param>
+        /// <param name="t"></param>
+        public void AddTransition(T start, T end, Transition t)
+        {
+            var startST = GetState(start);
+            var endST = GetState(end);
+
+            if (startST == null || endST == null) {
+                Debug.LogError("State(s) are not in the state machine");
+                return;
+            }
+
+            AddTransition(startST, endST, t);
+        }
+
+        /// <summary>
+        /// Add two transitions.
+        /// One from start to end.
+        /// Another from end to start.
+        /// </summary>
+        /// <param name="start"></param>
+        /// <param name="end"></param>
+        /// <param name="startToEnd"></param>
+        /// <param name="endToStart"></param>
+        public void AddBiTransition(T start, T end, Transition startToEnd, Transition endToStart)
+        {
+            var startST = GetState(start);
+            var endST = GetState(end);
+
+            if (startST == null || endST == null) {
+                Debug.LogError("State(s) are not in the state machine");
+                return;
+            }
+
+            AddTransition(startST, endST, startToEnd);
+            AddTransition(endST, startST, endToStart);
+        }
+
+        /// <summary>
+        /// Gets the state associated with the data.
+        /// </summary>
+        /// <param name="data"></param>
+        /// <returns></returns>
+        public State GetState(T data)
+        {
+            if (_states.ContainsKey(data)) {
+                return _states[data];
+            }
+
+            return null;
+        }
+
+        /// <summary>
+        /// Sets the current active state of the machine.
+        /// </summary>
+        /// <param name="data"></param>
+        public void SetCurrentState(T data)
+        {
+
+            var state = GetState(data);
+
+            if (state == null) {
+                Debug.LogError(data + " is not in the state machine.");
+            }
+
+            else {
+                _currentState = state;
+            }
+        }
+
+        /// <summary>
+        /// Handles moving to next state when conditions are met.
+        /// </summary>
+        public void Update()
+        {
+            if (_currentState == null) {
+                return;
+            }
+
+            Transition validTrans = null;
+
+            // Pick the next state if the transition conditions are met.
+            for (int i = 0; i < _currentState.Transitions.Count; i++) {
+
+                if (_currentState.Transitions[i].AllConditionsMet()) {
+                    validTrans = _currentState.Transitions[i];
+                    break;
+                }
+            }
+
+            if (validTrans != null) {
+
+                // Call on making transition.
+                if (validTrans.onMakingTransition()) {
+
+                    // Call on state exit.
+                    if (_currentState.onStateExit != null)
+                        _currentState.onStateExit();
+
+                    // Change the state to the next one.
+                    _currentState = validTrans.NextState;
+
+                    // Call on state enter.
+                    if (_currentState.onStateEnter != null)
+                        _currentState.onStateEnter();
+
+                    OnStateChangedEvent();
+                }
+            }
+        }
+
+        /// <summary>
+        /// A transition between two states than only occurs if all
+        /// its conditions are satisfied.
+        /// </summary>
+        public class Transition
+        {
+            private State _nextState = null;
+            private List<Func<bool>> _conditions = new List<Func<bool>>();
+
+            /// <summary>
+            /// Called after the 'from' state exits and before the 'to' state enters.
+            /// If this fails, then it goes back to the starting state.
+            /// </summary>
+            public Func<bool> onMakingTransition = () => { return true; };
+
+            public Transition()
+            {
+
+            }
+
+            /// <summary>
+            /// Pass in initial conditions
+            /// </summary>
+            /// <param name="?"></param>
+            public Transition(params Func<bool>[] conditions)
+            {
+                foreach (var c in conditions) {
+                    AddCondition(c);
+                }
+            }
+
+            /// <summary>
+            /// Adds a condition that must be satisfied in order to do the transition.
+            /// </summary>
+            /// <param name="cond"></param>
+            public void AddCondition(Func<bool> cond)
+            {
+                _conditions.Add(cond);
+            }
+
+            /// <summary>
+            /// Tests if all the conditions of the transition are satisfied.
+            /// </summary>
+            /// <returns></returns>
+            public bool AllConditionsMet()
+            {
+                for (int i = 0; i < _conditions.Count; i++) {
+
+                    if (!_conditions[i]()) return false;
+                }
+
+                // All conditions returned true.
+                return true;
+            }
+
+            /// <summary>
+            /// Set the state that transition goes to.
+            /// </summary>
+            /// <param name="next"></param>
+            public void SetNextState(State next)
+            {
+                _nextState = next;
+            }
+
+            /// <summary>
+            /// The state that transition goes to.
+            /// </summary>
+            public State NextState
+            {
+                get { return _nextState; }
+            }
+        }
+
+        /// <summary>
+        /// A state of the machine.
+        /// </summary>
+        public class State
+        {
+            private T _data;
+            private List<Transition> _transitions = new List<Transition>();
+
+            /// <summary>
+            /// Executes when the machine transitions into this state.
+            /// </summary>
+            public Action onStateEnter;
+
+            /// <summary>
+            /// Executes when the machine transitions out of this state.
+            /// </summary>
+            public Action onStateExit;
+
+            /// <summary>
+            /// Construct a state with its data.
+            /// </summary>
+            /// <param name="data"></param>
+            public State(T data)
+            {
+                _data = data;
+            }
+
+            /// <summary>
+            /// Adds a transition to the state.
+            /// </summary>
+            /// <param name="t"></param>
+            public void Add(Transition t)
+            {
+                _transitions.Add(t);
+            }
+
+            /// <summary>
+            /// The data held by the state.
+            /// </summary>
+            public T Value { get { return _data; } }
+
+            /// <summary>
+            /// The transitions connected to the state.
+            /// </summary>
+            public List<Transition> Transitions { get { return _transitions; } }
+        }
+    }
+}
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