RealFuels.Tanks.TankWindow.OnGUI C# (CSharp) Method

        public void OnGUI()
        {
            if (!styleSetup)
            {
                styleSetup = true;
                Styles.InitStyles ();
            }

            EditorLogic editor = EditorLogic.fetch;
            if (!HighLogic.LoadedSceneIsEditor || !editor) {
                return;
            }

            //UpdateMixtures ();
            bool cursorInGUI = false; // nicked the locking code from Ferram
            mousePos = Input.mousePosition; //Mouse location; based on Kerbal Engineer Redux code
            mousePos.y = Screen.height - mousePos.y;

            Rect tooltipRect;
            int posMult = 0;
            if (offsetGUIPos != -1) {
                posMult = offsetGUIPos;
            }
            if (ActionGroupMode) {
                if (guiWindowRect.width == 0) {
                    guiWindowRect = new Rect (430 * posMult, 365, 438, (Screen.height - 365));
                }
                tooltipRect = new Rect (guiWindowRect.xMin + 440, mousePos.y-5, 300, 20);
            } else {
                if (guiWindowRect.width == 0) {
                    guiWindowRect = new Rect (Screen.width - 8 - 430 * (posMult+1), 365, 438, (Screen.height - 365));
                }
                tooltipRect = new Rect (guiWindowRect.xMin - (230-8), mousePos.y - 5, 220, 20);
            }
            cursorInGUI = guiWindowRect.Contains (mousePos);
            if (cursorInGUI) {
                editor.Lock (false, false, false, "MFTGUILock");
                if (KSP.UI.Screens.Editor.PartListTooltipMasterController.Instance != null)
                    KSP.UI.Screens.Editor.PartListTooltipMasterController.Instance.HideTooltip ();
            } else {
                editor.Unlock ("MFTGUILock");
            }
            myToolTip = myToolTip.Trim ();
            if (!String.IsNullOrEmpty(myToolTip))
                GUI.Label(tooltipRect, myToolTip, Styles.styleEditorTooltip);
            guiWindowRect = GUILayout.Window (GetInstanceID (), guiWindowRect, GUIWindow, "Fuel Tanks for " + tank_module.part.partInfo.title, Styles.styleEditorPanel);
        }