Begin(), Drag() & End() event for native Handle in unity...

Hello, a simple task is driving me crazy.
My goal is: I want to tell in unity when the user start or finish draging an handle. The HandleMove, and HandleRotate (the native tools of unity)

Here is the base of the script:

Code (CSharp):

1.  
2.     [InitializeOnLoad]
3.     public static class CallBackIsMovingHandle
4.     {
5.         static CallBackIsMovingHandle()
6.         {
7.             SceneView.duringSceneGui += DuringSceneGUI;
8.         }
9.  
10.         private static void DuringSceneGUI(SceneView sceneView)
11.         {
12.                //do my tests here
13.         }
14.    }
15. }

Then for my actual test, here is a try:

Code (CSharp):

1.  
2.  
3.        if (Selection.activeGameObject == null)
4.        {
5.              return;
6.        }
7.      
8.        if (Tools.current != Tool.Move && Tools.current != Tool.Rotate)
9.        {
10.              return;
11.         }
12.  
13.        int controlID = HandleUtility.nearestControl;
14.  
15.        if (GUIUtility.hotControl == controlID)
16.             {
17.                 switch (Event.current.GetTypeForControl(controlID))
18.                 {
19.                      case EventType.MouseDown:
20.                         Debug.Log("Start");
21.                         break;
22.                     case EventType.MouseDrag:
23.                         Debug.Log("Drag");
24.                         break;
25.                     case EventType.MouseUp:
26.                         Debug.Log("up");
27.                         break;
28.                 }
29.             }

This code kind of work if my mouse stay hover the handle (first part of the video), but when i'm movong my mouse on the side, the Drag / mouseUp event doesn't work

I would like to find a way to detect mouse down/drag/up only for the handle tool.
When I'm using:

Code (CSharp):

1. int controlId = GUIUtility.GetControlID(FocusType.Passive);
2. switch (Event.current.GetTypeForControl(controlID))
3. {
4. // event..
5. }

If I use that code it detect also click/drag/up when i'm not even draging a handle (like when i'm moving in the sceneView or orbiting around some gameObject...)

AND: i would like the mouseUp to work even when my moue leave the sceneView of course...

Thanks!