First commit

Packages/com.jovian.inspector-tools/Editor/Attributes/LayerAttribute.cs

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+using UnityEngine;
+
+namespace Jovian.InspectorTools
+{
+	public class LayerAttribute : PropertyAttribute
+	{
+	}
+}
+
+#if UNITY_EDITOR
+namespace Jovian.InspectorTools.Internal
+{
+	using UnityEditor;
+	
+	[CustomPropertyDrawer(typeof(LayerAttribute))]
+	public class LayerAttributeDrawer : PropertyDrawer
+	{
+		public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
+		{
+			if (property.propertyType != SerializedPropertyType.Integer)
+			{
+				if (!_checked) Warning(property);
+				EditorGUI.PropertyField(position, property, label);
+				return;
+			}
+			
+			property.intValue = EditorGUI.LayerField(position, label, property.intValue);
+		}
+
+		private bool _checked;
+
+		private void Warning(SerializedProperty property)
+		{
+			Debug.LogWarning(string.Format("Property <color=brown>{0}</color> in object <color=brown>{1}</color> is of wrong type. Expected: Int",
+				property.name, property.serializedObject.targetObject));
+			_checked = true;
+		}
+	}
+}
+#endif