wm__getprevsibling.c

uCGUI

/*************************************************************************************************************
                                                   uC/GUI
                                               嵌入式通用图形软件
File        : WM__GetPrevSibling.c
Purpose     : Implementation of WM__GetPrevSibling
************************************************************************************************************/

#include "WM_Intern.H"
#if GUI_WINSUPPORT    /* If 0, WM will not generate any code */

/*************************************************************************************************************
*       Public code
************************************************************************************************************/

/*************************************************************************************************************
*       WM__GetPrevSibling

  Return value: Handle of previous sibling (if any), otherwise 0
*/

WM_HWIN WM__GetPrevSibling(WM_HWIN hWin) {
  WM_HWIN hi;
  WM_Obj* pi;
  for (hi = WM__GetFirstSibling(hWin); hi; hi = pi->hNext) {
    if (hi == hWin) {
      hi = 0;                 /* There is no previous sibling. Return 0 */
      break;
    }
    pi = WM_H2P(hi);
    if (pi->hNext == hWin) {
      break;                  /* We found the previous one ! */
    }
  }
  return hi;
}

#else
  void WM__GetPrevSibling_C(void) {} /* avoid empty object files */
#endif