89 lines
3.0 KiB
C
89 lines
3.0 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_SetFocus.c
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Purpose : Implementation of WM_SetFocus
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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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* 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_SetFocus
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*
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* Purpose:
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* Sets the focus to the specified child. It sends 2 messages:
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* WM_SET_FOCUS(1) to window to receive focus
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* WM_SET_FOCUS(0) to window to lose focus
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*
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* Return value:
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* 0 on success (Focus could be set)
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* !=0 on failure (Windows could not take the focus)
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*/
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int WM_SetFocus(WM_HWIN hWin) {
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int r;
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WM_MESSAGE Msg = {0};
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WM_LOCK();
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if ((hWin) && (hWin != WM__hWinFocus)) {
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WM_NOTIFY_CHILD_HAS_FOCUS_INFO Info;
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Info.hOld = WM__hWinFocus;
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Info.hNew = hWin;
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Msg.MsgId = WM_SET_FOCUS;
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/* Send a "no more focus" message to window losing focus */
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Msg.Data.v = 0;
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if (WM__hWinFocus) {
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WM_SendMessage(WM__hWinFocus, &Msg);
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}
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/* Send "You have the focus now" message to the window */
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Msg.Data.v = 1;
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WM_SendMessage(WM__hWinFocus = hWin, &Msg);
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if ((r = Msg.Data.v) == 0) { /* On success only */
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/* Set message to ancestors of window getting the focus */
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while ((hWin = WM_GetParent(hWin)) != 0) {
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Msg.MsgId = WM_NOTIFY_CHILD_HAS_FOCUS;
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Msg.Data.p = &Info;
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WM_SendMessage(hWin, &Msg);
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}
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/* Set message to ancestors of window loosing the focus */
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hWin = Info.hOld;
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if (WM_IsWindow(hWin)) { /* Make sure window has not been deleted in the mean time. Can be optimized: _DeleteWindow could clear the handle to avoid this check (RS) */
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while ((hWin = WM_GetParent(hWin)) != 0) {
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Msg.MsgId = WM_NOTIFY_CHILD_HAS_FOCUS;
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Msg.Data.p = &Info;
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WM_SendMessage(hWin, &Msg);
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}
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}
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}
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} else {
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r = 1;
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}
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WM_UNLOCK();
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return r;
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}
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#else
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void WM_SetFocus_C(void) {} /* avoid empty object files */
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#endif
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/*************************** End of file ****************************/
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