Does the GUI in this editor window want MouseMove events?
// Editor Script that shows how mouse movement events // get caught in the editor window class WantsMouseMoveEx extends EditorWindow { @MenuItem("Example/wantsMouseMove example") static function InitWindow() { var window : WantsMouseMoveEx = GetWindowWithRect(WantsMouseMoveEx, Rect(0, 0, 300, 300)); } function OnGUI() { wantsMouseMove = EditorGUILayout.Toggle ("Receive Movement: ", wantsMouseMove); EditorGUILayout.LabelField ("Mouse Position: ", Event.current.mousePosition.ToString ()); // Repaint the window as wantsMouseMove doesnt trigger a repaint automatically if (Event.current.type == EventType.MouseMove) Repaint (); } }