subedit.cpp

VC程序设计技巧与实例（2）关于窗口和桌面系统、文件和系统操作、消息影射的原代码

// SubEdit.cpp : implementation file
//

#include "stdafx.h"
#include "SubClass.h"
#include "SubEdit.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CSubEdit

CSubEdit::CSubEdit()
{
}

CSubEdit::~CSubEdit()
{
}


BEGIN_MESSAGE_MAP(CSubEdit, CEdit)
	//{{AFX_MSG_MAP(CSubEdit)
		// NOTE - the ClassWizard will add and remove mapping macros here.
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CSubEdit message handlers

BOOL CSubEdit::PreTranslateMessage(MSG* pMsg) 
{
	// TODO: Add your specialized code here and/or call the base class
	if (pMsg->message == WM_KEYDOWN &&
		(pMsg->wParam == VK_UP || pMsg->wParam == VK_DOWN))
	{
		int nextprev=GW_HWNDNEXT;
		int firstlast=GW_HWNDFIRST;
		if (pMsg->wParam == VK_UP)//如果用户按下了上箭头键
		{
			nextprev=GW_HWNDPREV;
			firstlast=GW_HWNDLAST;
		}
		HWND hWnd = m_hWnd;
		while (hWnd)
		{
			HWND hWndx=hWnd;
			if ((hWnd = ::GetWindow(hWnd, nextprev))==NULL)
				hWnd = ::GetWindow(hWndx, firstlast);
			long style=::GetWindowLong(hWnd,GWL_STYLE);//获得窗口属性
			//翻译上下箭头为Tab和Shift-Tab键
			if ((style&WS_TABSTOP && !(style&WS_DISABLED) && style&WS_VISIBLE) || hWnd==m_hWnd)
				break;
		}
		::SetFocus(hWnd);

		return TRUE;
	}
	
	return CEdit::PreTranslateMessage(pMsg);
}