gui_selectlayer.c

ucgui的3.98版本的源代码

/*
*********************************************************************************************************
*                                             uC/GUI V3.98
*                        Universal graphic software for embedded applications
*
*                       (c) Copyright 2002, Micrium Inc., Weston, FL
*                       (c) Copyright 2002, SEGGER Microcontroller Systeme GmbH
*
*              礐/GUI is protected by international copyright laws. Knowledge of the
*              source code may not be used to write a similar product. This file may
*              only be used in accordance with a license and should not be redistributed
*              in any way. We appreciate your understanding and fairness.
*
----------------------------------------------------------------------
File        : GUI_SelectLayer.c.C
Purpose     : Selection of Layer
---------------------------END-OF-HEADER------------------------------
*/

#include <stddef.h>           /* needed for definition of NULL */
#include "GUI_Private.h"

/*********************************************************************
*
*       Public code
*
**********************************************************************
*/
/*********************************************************************
*
*       GUI_SelectLayer
*/
unsigned int GUI_SelectLayer(unsigned int Index) {
  unsigned int OldIndex;
  GUI_LOCK();
  OldIndex = GUI_Context.SelLayer;
  if (Index < GUI_NUM_LAYERS) {
    GUI_Context.SelLayer = Index;
    GUI_SelectLCD();
  }
  GUI_UNLOCK();
  return OldIndex;
}

/*************************** End of file ****************************/