first commit

Assets/Plugins/ParadoxNotion/NodeCanvas/Tasks/Conditions/Blackboard/OnVariableChange.cs

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+using NodeCanvas.Framework;
+using NodeCanvas.Framework.Internal;
+using ParadoxNotion.Design;
+
+namespace NodeCanvas.Tasks.Conditions
+{
+    [Name("On Variable Changed")]
+    [Category("✫ Blackboard")]
+    public class BBVariableChanged : ConditionTask
+    {
+
+        [BlackboardOnly] public BBObjectParameter targetVariable;
+
+        protected override string info {
+            get { return targetVariable + " Changed."; }
+        }
+
+        protected override string OnInit() {
+            if ( targetVariable.isNone ) {
+                return "Blackboard Variable not set.";
+            }
+            return null;
+        }
+
+        protected override void OnEnable() {
+            targetVariable.varRef.onValueChanged += OnValueChanged;
+        }
+
+        protected override void OnDisable() {
+            targetVariable.varRef.onValueChanged -= OnValueChanged;
+        }
+
+        protected override bool OnCheck() { return false; }
+
+        private void OnValueChanged(object varValue) {
+            YieldReturn(true);
+        }
+    }
+}