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Assets/Plugins/NaughtyAttributes/Scripts/Editor/PropertyDrawers/ShowAssetPreviewPropertyDrawer.cs

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+using UnityEngine;
+using UnityEditor;
+
+namespace NaughtyAttributes.Editor
+{
+    [CustomPropertyDrawer(typeof(ShowAssetPreviewAttribute))]
+    public class ShowAssetPreviewPropertyDrawer : PropertyDrawerBase
+    {
+        protected override float GetPropertyHeight_Internal(SerializedProperty property, GUIContent label)
+        {
+            if (property.propertyType == SerializedPropertyType.ObjectReference)
+            {
+                Texture2D previewTexture = GetAssetPreview(property);
+                if (previewTexture != null)
+                {
+                    return GetPropertyHeight(property) + GetAssetPreviewSize(property).y;
+                }
+                else
+                {
+                    return GetPropertyHeight(property);
+                }
+            }
+            else
+            {
+                return GetPropertyHeight(property) + GetHelpBoxHeight();
+            }
+        }
+
+        protected override void OnGUI_Internal(Rect rect, SerializedProperty property, GUIContent label)
+        {
+            EditorGUI.BeginProperty(rect, label, property);
+
+            if (property.propertyType == SerializedPropertyType.ObjectReference)
+            {
+                Rect propertyRect = new Rect()
+                {
+                    x = rect.x,
+                    y = rect.y,
+                    width = rect.width,
+                    height = EditorGUIUtility.singleLineHeight
+                };
+
+                EditorGUI.PropertyField(propertyRect, property, label);
+
+                Texture2D previewTexture = GetAssetPreview(property);
+                if (previewTexture != null)
+                {
+                    Rect previewRect = new Rect()
+                    {
+                        x = rect.x + NaughtyEditorGUI.GetIndentLength(rect),
+                        y = rect.y + EditorGUIUtility.singleLineHeight,
+                        width = rect.width,
+                        height = GetAssetPreviewSize(property).y
+                    };
+
+                    GUI.Label(previewRect, previewTexture);
+                }
+            }
+            else
+            {
+                string message = property.name + " doesn't have an asset preview";
+                DrawDefaultPropertyAndHelpBox(rect, property, message, MessageType.Warning);
+            }
+
+            EditorGUI.EndProperty();
+        }
+
+        private Texture2D GetAssetPreview(SerializedProperty property)
+        {
+            if (property.propertyType == SerializedPropertyType.ObjectReference)
+            {
+                if (property.objectReferenceValue != null)
+                {
+                    Texture2D previewTexture = AssetPreview.GetAssetPreview(property.objectReferenceValue);
+                    return previewTexture;
+                }
+
+                return null;
+            }
+
+            return null;
+        }
+
+        private Vector2 GetAssetPreviewSize(SerializedProperty property)
+        {
+            Texture2D previewTexture = GetAssetPreview(property);
+            if (previewTexture == null)
+            {
+                return Vector2.zero;
+            }
+            else
+            {
+                int targetWidth = ShowAssetPreviewAttribute.DefaultWidth;
+                int targetHeight = ShowAssetPreviewAttribute.DefaultHeight;
+
+                ShowAssetPreviewAttribute showAssetPreviewAttribute = PropertyUtility.GetAttribute<ShowAssetPreviewAttribute>(property);
+                if (showAssetPreviewAttribute != null)
+                {
+                    targetWidth = showAssetPreviewAttribute.Width;
+                    targetHeight = showAssetPreviewAttribute.Height;
+                }
+
+                int width = Mathf.Clamp(targetWidth, 0, previewTexture.width);
+                int height = Mathf.Clamp(targetHeight, 0, previewTexture.height);
+
+                return new Vector2(width, height);
+            }
+        }
+    }
+}