organize into upm directory structure

DefaultAttributes/SerializeReferenceButtonAttribute.meta

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DefaultAttributes/SerializeReferenceButtonAttribute/SerializeReferenceButtonAttribute.cs

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+using System;
+using UnityEngine;
+
+[AttributeUsage(AttributeTargets.Field)]
+public class SerializeReferenceButtonAttribute : PropertyAttribute
+{
+    
+}

DefaultAttributes/SerializeReferenceButtonAttribute/SerializeReferenceButtonAttribute.cs.meta

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+guid: c64e0f68b41b48939c9b98cc29a19b20
+timeCreated: 1579584059

DefaultAttributes/SerializeReferenceButtonAttribute/SerializeReferenceButtonAttributeDrawer.cs

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+#if UNITY_EDITOR
+
+using UnityEditor; 
+using UnityEngine;
+
+[CustomPropertyDrawer(typeof(SerializeReferenceButtonAttribute))]
+public class SerializeReferenceButtonAttributeDrawer : PropertyDrawer
+{
+    public override float GetPropertyHeight(SerializedProperty property, GUIContent label)
+    {
+        return EditorGUI.GetPropertyHeight(property, true);
+    }
+ 
+    public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
+    {
+
+        
+        EditorGUI.BeginProperty(position, label, property); 
+        
+        var labelPosition = new Rect(position.x, position.y, position.width, EditorGUIUtility.singleLineHeight);
+        EditorGUI.LabelField(labelPosition, label);    
+         
+        var typeRestrictions = SerializedReferenceUIDefaultTypeRestrictions.GetAllBuiltInTypeRestrictions(fieldInfo);
+        property.DrawSelectionButtonForManagedReference(position, typeRestrictions);
+        
+        EditorGUI.PropertyField(position, property, GUIContent.none, true);
+        
+        EditorGUI.EndProperty(); 
+    } 
+}
+#endif

DefaultAttributes/SerializeReferenceButtonAttribute/SerializeReferenceButtonAttributeDrawer.cs.meta

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+guid: 5a07638044724309b6088c28a11a15af
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DefaultAttributes/SerializeReferenceMenuAttribute.meta

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DefaultAttributes/SerializeReferenceMenuAttribute/SerializeReferenceMenuAttribute.cs

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+using System;
+using UnityEngine;
+
+[AttributeUsage(AttributeTargets.Field)]
+public class SerializeReferenceMenuAttribute : PropertyAttribute
+{
+    
+}

DefaultAttributes/SerializeReferenceMenuAttribute/SerializeReferenceMenuAttribute.cs.meta

@@ -0,0 +1,3 @@
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+timeCreated: 1579584059

DefaultAttributes/SerializeReferenceMenuAttribute/SerializeReferenceMenuAttributeDrawer.cs

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+#if UNITY_EDITOR
+
+using UnityEditor;
+using UnityEngine;
+
+[CustomPropertyDrawer(typeof(SerializeReferenceMenuAttribute))]
+public class SerializeReferenceMenuAttributeDrawer : PropertyDrawer
+{
+    public override float GetPropertyHeight(SerializedProperty property, GUIContent label)
+    {
+        return EditorGUI.GetPropertyHeight(property, true);
+    }
+
+    public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
+    {
+        EditorGUI.BeginProperty(position, label, property);
+        
+        var typeRestrictions = SerializedReferenceUIDefaultTypeRestrictions.GetAllBuiltInTypeRestrictions(fieldInfo);
+        property.ShowContextMenuForManagedReferenceOnMouseMiddleButton(position, typeRestrictions);
+        
+        EditorGUI.PropertyField(position, property, true);
+        EditorGUI.EndProperty();
+    }
+}
+#endif
+

DefaultAttributes/SerializeReferenceMenuAttribute/SerializeReferenceMenuAttributeDrawer.cs.meta

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+timeCreated: 1579584059

DefaultAttributes/SerializeReferenceUIRestrictionExcludeTypes.meta

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DefaultAttributes/SerializeReferenceUIRestrictionExcludeTypes/SerializeReferenceUIRestrictionExcludeTypes.cs

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+using System;
+using UnityEngine;
+
+/// None of this types or interface types are valid.
+[AttributeUsage(AttributeTargets.Field)]
+public class SerializeReferenceUIRestrictionExcludeTypes : PropertyAttribute
+{
+    public readonly Type[] Types;
+    public SerializeReferenceUIRestrictionExcludeTypes(params Type[] types) => Types = types;
+} 

DefaultAttributes/SerializeReferenceUIRestrictionExcludeTypes/SerializeReferenceUIRestrictionExcludeTypes.cs.meta

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DefaultAttributes/SerializeReferenceUIRestrictionIncludeTypes.meta

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DefaultAttributes/SerializeReferenceUIRestrictionIncludeTypes/SerializeReferenceUIRestrictionIncludeTypes.cs

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+using System;
+using UnityEngine;
+
+/// Any of this types or interface types are valid. And only this types can be presented.
+[AttributeUsage(AttributeTargets.Field)]
+public class SerializeReferenceUIRestrictionIncludeTypes : PropertyAttribute
+{
+    public readonly Type[] Types;
+    public SerializeReferenceUIRestrictionIncludeTypes(params Type[] types) => Types = types;
+}

DefaultAttributes/SerializeReferenceUIRestrictionIncludeTypes/SerializeReferenceUIRestrictionIncludeTypes.cs.meta

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DefaultAttributes/SerializedReferenceUIDefaultTypeRestrictions.cs

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+using System;
+using System.Collections.Generic;
+using System.Reflection;
+
+public static class SerializedReferenceUIDefaultTypeRestrictions
+{
+    public static IEnumerable<Func<Type, bool>> GetAllBuiltInTypeRestrictions(FieldInfo fieldInfo)
+    {
+        var result = new List<Func<Type, bool>>();
+        
+        var attributeObjects = fieldInfo.GetCustomAttributes(false);
+        foreach (var attributeObject in attributeObjects)
+        {
+            switch (attributeObject)
+            { 
+                case SerializeReferenceUIRestrictionIncludeTypes includeTypes:
+                    result.Add(SerializeReferenceTypeRestrictionFilters.TypeIsSubclassOrEqualOrHasInterface(includeTypes.Types)); 
+                    continue;
+                case SerializeReferenceUIRestrictionExcludeTypes excludeTypes:
+                    result.Add(SerializeReferenceTypeRestrictionFilters.TypeIsNotSubclassOrEqualOrHasInterface(excludeTypes.Types)); 
+                    continue;
+            } 
+        }
+        return result; 
+    }
+} 

DefaultAttributes/SerializedReferenceUIDefaultTypeRestrictions.cs.meta

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