How to conditionally execute code when object has been dropped in a scene (scene view or hierarchy)

Hello everyone.

I'm doing some editor script coding. I would like to execute some code when an object (with a particular component) is dropped in the scene or in the hierarchy window BUT only if the control key is held down.

So I need to solve these two problems:
1) detect object creation
2) detect control being held down

Unfortunately, I'm unable to solve these two problems at the same time... I tried in two ways.

The first way is through my custom inspector. I can solve (2) easily using Event.current.control but not (1). I tried using EditorApplication.hierarchyWindowChanged but the documentation says "Each time an object is (or a group of objects are) created, renamed, parented, unparented or destroyed this callback is raised.". I did not find any way to know which one of these (created, renamed,...).

So I tried the other way, through my MonoBehaviour script... I came up with this for (1)

Code (CSharp):

1. [ExecuteInEditMode]
2. public class MyComponent : MonoBehaviour
3. {
4. ...
5. #if UNITY_EDITOR
6.   private void Awake()
7.   {
8.     if (!Application.isPlaying)
9.       Debug.Log("Created");
10.   }
11. #endif
12. ...
13. }

Whenever I drop an object with MyComponent on it, Debug.Log("Created") would be called. The problem is how do I detect (2) now? I assumed you cannot get the current key down in the editor from a MonoBehaviour. Have I missed something?

 

http://answers.unity3d.com/questions/130898/how-to-check-if-a-key-is-down-in-editor-script.html

edit: oops

 

Read again. You seem to have missed the fact that I already tried from editor script (custom inspector)

If only I could detect the creation of the object in editor script too (like I did through the MonoBehaviour script) it would be perfect...

 

If somebody would find a reliable way to figure out the input state during edit time without having to be in a GUI-frame, I'd pay a lot of money for that.

Afaik, it's simply not possible to do those two things. Unity's really not got any good ways to check that an object's been dragged into the scene, and Unity's really not got any good ways to check if control's pressed at edit time. Figuring out either requires hacks, and none of the hacks I know of for either overlap.