问自下而上的Unity3D滚动视图/滚动条

EN

// relevant instance variables
    private Rect _windowPosition = new Rect();
            List<string> output = new List<string>();
            string user_input = "";
            Vector2 scroll_pos = new Vector2(1,1);

        ...
        ...
        ...

    private void onWindow(int windowID){
                GUILayout.BeginVertical();

            // Output is placed here. Is Scrollable
                scroll_pos = GUILayout.BeginScrollView( scroll_pos );
                GUILayout.Label( String.Join("\n", output.ToArray()) );
                GUILayout.EndScrollView();
            // Output ends here. Next piece is user input

                user_input = GUILayout.TextField(user_input);
                if (Event.current.Equals(Event.KeyboardEvent("return"))) {
                    output.Add(user_input);
                    user_input = ""; //clears the TextField
                    scroll_pos.x = 1;
                    scroll_pos.y = 1;
                }
                GUILayout.EndVertical();
                GUI.DragWindow();
            }