added more utilty packges

Packages/com.jovian.inspector/Editor/Attributes/SpriteLayerAttribute.cs

@@ -0,0 +1,113 @@
+// ---------------------------------------------------------------------------- 
+// Author: Kaynn, Yeo Wen Qin
+// https://github.com/Kaynn-Cahya
+// Date:   11/02/2019
+// ----------------------------------------------------------------------------
+
+using UnityEngine;
+
+#if UNITY_EDITOR
+using UnityEditor;
+#endif
+
+namespace InspectorToolkit
+{
+	public class SpriteLayerAttribute : PropertyAttribute
+	{
+	}
+}
+
+#if UNITY_EDITOR
+namespace InspectorToolkit.Internal
+{
+	[CustomPropertyDrawer(typeof(SpriteLayerAttribute))]
+	public class SpriteLayerAttributeDrawer : PropertyDrawer
+	{
+		public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
+		{
+			if (property.propertyType != SerializedPropertyType.Integer)
+			{
+				if (!_checkedType) PropertyTypeWarning(property);
+				EditorGUI.PropertyField(position, property, label);
+				return;
+			}
+
+			var spriteLayerNames = GetSpriteLayerNames();
+			HandleSpriteLayerSelectionUI(position, property, label, spriteLayerNames);
+		}
+
+		private bool _checkedType;
+		private void PropertyTypeWarning(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));
+			_checkedType = true;
+		}
+		
+		private void HandleSpriteLayerSelectionUI(Rect position, SerializedProperty property, GUIContent label, string[] spriteLayerNames)
+		{
+			EditorGUI.BeginProperty(position, label, property);
+
+			// To show which sprite layer is currently selected.
+			int currentSpriteLayerIndex;
+			bool layerFound = TryGetSpriteLayerIndexFromProperty(out currentSpriteLayerIndex, spriteLayerNames, property);
+
+			if (!layerFound)
+			{
+				// Set to default layer. (Previous layer was removed)
+				Debug.Log(string.Format(
+					"Property <color=brown>{0}</color> in object <color=brown>{1}</color> is set to the default layer. Reason: previously selected layer was removed.",
+					property.name, property.serializedObject.targetObject));
+				property.intValue = 0;
+				currentSpriteLayerIndex = 0;
+			}
+
+			int selectedSpriteLayerIndex = EditorGUI.Popup(position, label.text, currentSpriteLayerIndex, spriteLayerNames);
+
+			// Change property value if user selects a new sprite layer.
+			if (selectedSpriteLayerIndex != currentSpriteLayerIndex)
+			{
+				property.intValue = SortingLayer.NameToID(spriteLayerNames[selectedSpriteLayerIndex]);
+			}
+
+			EditorGUI.EndProperty();
+		}
+
+		#region Util
+
+		private bool TryGetSpriteLayerIndexFromProperty(out int index, string[] spriteLayerNames, SerializedProperty property)
+		{
+			// To keep the property's value consistent, after the layers have been sorted around.
+			string layerName = SortingLayer.IDToName(property.intValue);
+
+			// Return the index where on it matches.
+			for (int i = 0; i < spriteLayerNames.Length; ++i)
+			{
+				if (spriteLayerNames[i].Equals(layerName))
+				{
+					index = i;
+					return true;
+				}
+			}
+
+			// The current layer was removed.
+			index = -1;
+			return false;
+		}
+
+		private string[] GetSpriteLayerNames()
+		{
+			string[] result = new string[SortingLayer.layers.Length];
+
+			for (int i = 0; i < result.Length; ++i)
+			{
+				result[i] = SortingLayer.layers[i].name;
+			}
+
+			return result;
+		}
+
+		#endregion
+	}
+}
+#endif