Allow node input/output tooltips to be overriden through

the use of an attribute applied to custom classes.

Scripts/Attributes/OverrideTooltipAttribute.cs

@@ -0,0 +1,23 @@
+using System;
+
+namespace XNodeEditor {
+    
+    /// <summary>
+    /// <para>When applied to the definition of a custom class, allows for the tooltip shown beside the nodes to be overriden.</para>
+    /// Optionally, whether an output node's value is shown in the tooltip can also be turned off.
+    /// Leaving the tooltip override blank or null will leave the normal tooltip (type name) in place.
+    /// </summary>
+    [AttributeUsage(AttributeTargets.Class)]
+    public sealed class OverrideTooltipAttribute : Attribute {
+        public readonly bool overrideTooltip;
+        public readonly string tooltip;
+        public readonly bool hideValue;
+            
+        public OverrideTooltipAttribute(string tooltip = "", bool hideValue = false) {
+            overrideTooltip = !string.IsNullOrEmpty(tooltip);
+            if (overrideTooltip) this.tooltip = tooltip;
+            this.hideValue = hideValue;
+        }
+    }
+    
+}

Scripts/Attributes/OverrideTooltipAttribute.cs.meta

@@ -0,0 +1,11 @@
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Scripts/Editor/NodeGraphEditor.cs

@@ -123,9 +123,17 @@ namespace XNodeEditor {
         public virtual string GetPortTooltip(XNode.NodePort port) {
             Type portType = port.ValueType;
             string tooltip = "";
-            tooltip = portType.PrettyName();
+
-            if (port.IsOutput) {
+            // Now allow tooltips to be overridden or to have their values hidden based on attribute usage
-                object obj = port.node.GetValue(port);
+            var targetType = portType.HasElementType ? portType.GetElementType() : portType; // For arrays and lists.
+            // ReSharper disable once PossibleNullReferenceException
+            var attr = ((OverrideTooltipAttribute[])targetType
+                .GetCustomAttributes(typeof(OverrideTooltipAttribute), false)).SingleOrDefault();
+            tooltip = attr?.overrideTooltip ?? false ? attr.tooltip : targetType.PrettyName();
+            var hideValue = attr?.hideValue ?? false;
+            // ReSharper disable once InvertIf
+            if (!hideValue && port.IsOutput) {
+                var obj = port.node.GetValue(port);
                 tooltip += " = " + (obj != null ? obj.ToString() : "null");
             }
             return tooltip;