wm_setfocus.c

MCB2300_ucgui_LCD320240.rar LPC2368的uc/gui的移植

/*
*********************************************************************************************************
*   											 uC/GUI
*   					 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		: WM_SetFocus.c
Purpose 	: Implementation of WM_SetFocus
----------------------------------------------------------------------
*/

#include "WM_Intern.h"

#if GUI_WINSUPPORT    /* If 0, WM will not generate any code */

/*********************************************************************
*
*   	Public code
*
**********************************************************************
*/
/*********************************************************************
*
*   	WM_SetFocus
*
* Purpose:
*   Sets the focus to the specified child. It sends 2 messages:
*    WM_SET_FOCUS(1) to window to receive focus
*    WM_SET_FOCUS(0) to window to lose focus
*
* Return value:
*   0    on success (Focus could be set)
*   !=0  on failure (Windows could not take the focus)
*/
int WM_SetFocus(WM_HWIN hWin)
{
	int r;
	WM_MESSAGE Msg = {0};
	WM_LOCK();
	if ((hWin) && (hWin != WM__hWinFocus))
	{
		WM_NOTIFY_CHILD_HAS_FOCUS_INFO Info;
		Info.hOld = WM__hWinFocus;
		Info.hNew = hWin;
		Msg.MsgId = WM_SET_FOCUS;
		/* Send a "no more focus" message to window losing focus */
		Msg.Data.v = 0;
		if (WM__hWinFocus)
		{
			WM_SendMessage(WM__hWinFocus, &Msg);
		}
		/* Send "You have the focus now" message to the window */
		Msg.Data.v = 1;
		WM_SendMessage(WM__hWinFocus = hWin, &Msg);
		if ((r = Msg.Data.v) == 0)
		{
			/* On success only */
			/* Set message to ancestors of window getting the focus */
			while ((hWin = WM_GetParent(hWin)) != 0)
			{
				Msg.MsgId = WM_NOTIFY_CHILD_HAS_FOCUS;
				Msg.Data.p = &Info;
				WM_SendMessage(hWin, &Msg);
			}
			/* Set message to ancestors of window loosing the focus */
			hWin = Info.hOld;
			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) */
				while ((hWin = WM_GetParent(hWin)) != 0)
				{
					Msg.MsgId = WM_NOTIFY_CHILD_HAS_FOCUS;
					Msg.Data.p = &Info;
					WM_SendMessage(hWin, &Msg);
				}
			}
		}
	}
	else
	{
		r = 1;
	}
	WM_UNLOCK();
	return r;
}

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

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