Unity Editor Drag'n'Drop

DragNDropInspector

using UnityEngine;
using UnityEditor;
using System.Collections; 
using JSONPersistency;

[CustomEditor(typeof(DragNDrop))]
public class DragNDropInspector : Editor
{ 

	Color picked = Color.green;

	public override void OnInspectorGUI ()
	{    
			GUILayout.Space (20);

			Rect colRect = GUILayoutUtility.GetRect (20, 40);

			Rect horizontalRect = EditorGUILayout.BeginHorizontal ();

			picked = EditorGUI.ColorField (colRect, picked);
			EditorGUILayout.EndHorizontal ();

			checkDragable (colRect, picked);

			GUILayout.Space (20);

	} 


	private void checkDragable (Rect colRect, Color col)
	{

			string DragKey = "Color";

			if (Event.current.type == EventType.DragUpdated
				&& colRect.Contains (Event.current.mousePosition)) {
		
				// if ok show texture Color
				//if (gotDragableWithRender (DragAndDrop.objectReferences)) {
				DragAndDrop.visualMode = DragAndDropVisualMode.Copy;
		
				if (DragAndDrop.GetGenericData (DragKey) == null) {
						DragAndDrop.SetGenericData (DragKey, col);
				}
			
/*					} else {
						// show a rejected sign on the mousecursor
						DragAndDrop.visualMode = DragAndDropVisualMode.Rejected;
				}
*/			
					Event.current.Use ();
			}
	
			if (Event.current.type == EventType.DragPerform
					&& colRect.Contains (Event.current.mousePosition)) {
		
					Color color = (Color)DragAndDrop.GetGenericData (DragKey);
		
		
					//if (gotDragableWithRender (DragAndDrop.objectReferences)) {
					applyColorToRenderer (DragAndDrop.objectReferences, color);
					//}
		
					Event.current.Use ();
			}

	}


	private void applyColorToRenderer (Object[] objs, Color color)
	{

			foreach (Object obj in objs) {

					if (obj.GetType () == typeof(GameObject)) {

							Renderer render = ((GameObject)obj).GetComponent<Renderer> ();
							render.sharedMaterial.color = color;
					}
			}

	}

}