✨ Separated events from variables and adjusted test scene

scripts/CSharp/Low Code/Variables/VariableResource.cs

@@ -0,0 +1,69 @@
+using System.Collections.Generic;
+using Godot;
+
+namespace Babushka.scripts.CSharp.Low_Code.Variables;
+
+[GlobalClass]
+public partial class VariableResource : Resource
+{
+    /// <summary>
+    /// Log into console when this event resource is adding or removing listeners, and when it's raised.
+    /// </summary>
+    [Export] private bool _showLog;
+    
+    [Export]
+    public Variant Payload
+    {
+        get { return _payload; }
+        set
+        {
+            if (!_payload.Equals(value))
+            {
+                _lastPayload = _payload;
+                _payload = value;
+                ValueChangeHandler();
+            }
+        }
+    }
+    
+    private Variant _payload;
+    private Variant _lastPayload;
+    
+    private List<VariableListener> _varListeners = new ();
+    
+    /// <summary>
+    /// Adds an EventListener to the calling list for this event.
+    /// </summary>
+    /// <param name="listener"></param>
+    public void RegisterListener(VariableListener listener)
+    {
+        if(_showLog)
+            GD.Print("Registering listener " + listener);
+        _varListeners.Add(listener);
+    }
+
+    /// <summary>
+    /// Removes an Eventlistener from the calling list for this event.
+    /// </summary>
+    /// <param name="listener"></param>
+    public void UnregisterListener(VariableListener listener)
+    {
+        if(_showLog)
+            GD.Print("Unregistering listener " + listener);
+        _varListeners.Remove(listener);
+    }
+    
+    /// <summary>
+    /// Called when the Payload value changed.
+    /// </summary>
+    public void ValueChangeHandler()
+    {
+        if(_showLog)
+            GD.Print($"Event payload changed from {_lastPayload} to {_payload} on event resource: " + ResourcePath.GetFile().TrimSuffix(".tres"));
+        
+        foreach (var eventListener in _varListeners)
+        {
+            eventListener.EventPayloadChanged(_payload, _lastPayload);
+        }
+    }
+}