113 lines
3.1 KiB
C
113 lines
3.1 KiB
C
/*
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*********************************************************************************************************
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* uC/GUI
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* Universal graphic software for embedded applications
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*
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* (c) Copyright 2002, Micrium Inc., Weston, FL
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* (c) Copyright 2002, SEGGER Microcontroller Systeme GmbH
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*
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* µC/GUI is protected by international copyright laws. Knowledge of the
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* source code may not be used to write a similar product. This file may
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* only be used in accordance with a license and should not be redistributed
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* in any way. We appreciate your understanding and fairness.
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*
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----------------------------------------------------------------------
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File : WM_SetFocusOnPrevChild.c
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Purpose : Implementation of WM_SetFocusOnPrevChild
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----------------------------------------------------------------------
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*/
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#include "WM_Intern.h"
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#if GUI_WINSUPPORT /* If 0, WM will not generate any code */
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/*********************************************************************
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*
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* Static code
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*
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**********************************************************************
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*/
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/*********************************************************************
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*
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* _GetPrevChild
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*
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* Purpose:
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* Returns a handle to the previous child of a window.
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*
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* Parameters:
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* hParent: Handle of parent window.
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* hChild: Handle of child to begin our search to its previous sibling.
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*
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* Return value:
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* Handle to previous child if we found one.
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* 0 if window has no other children.
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*/
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static WM_HWIN _GetPrevChild(WM_HWIN hChild) {
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WM_HWIN hObj = 0;
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if (hChild) {
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hObj = WM__GetPrevSibling(hChild);
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}
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if (!hObj) {
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hObj = WM__GetLastSibling(hChild);
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}
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if (hObj != hChild) {
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return hObj;
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}
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return 0;
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}
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/*********************************************************************
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*
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* _SetFocusOnPrevChild
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*
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* Purpose:
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* Sets the focus on previous focussable child of a window.
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*
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* Return value:
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* Handle of focussed child, if we found an other focussable child
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* as the current. Otherwise the return value is zero.
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*/
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static WM_HWIN _SetFocusOnPrevChild(WM_HWIN hParent) {
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WM_HWIN hChild, hWin;
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hChild = WM__GetFocussedChild(hParent);
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hChild = _GetPrevChild(hChild);
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hWin = hChild;
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while ((WM_IsFocussable(hWin) == 0) && hWin) {
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hWin = _GetPrevChild(hWin);
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if (hWin == hChild) {
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break;
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}
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}
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if (WM_SetFocus(hWin) == 0) {
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return hWin;
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}
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return 0;
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}
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/*********************************************************************
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*
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* Public code
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*
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**********************************************************************
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*/
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/*********************************************************************
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*
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* WM_SetFocusOnPrevChild
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*/
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WM_HWIN WM_SetFocusOnPrevChild(WM_HWIN hParent) {
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WM_HWIN r = 0;
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if (hParent) {
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WM_LOCK();
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r = _SetFocusOnPrevChild(hParent);
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WM_UNLOCK();
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}
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return r;
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}
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#else
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void WM_SetFocusOnPrevChild_C(void);
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void WM_SetFocusOnPrevChild_C(void) {} /* avoid empty object files */
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#endif
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/*************************** End of file ****************************/
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