三、程序代码
/////////////////////////////////////////
#include "stdafx.h"
// Generic dialog-that-uses-accelerators.
class CDlgWithAccelerators : public CDialog {
public:
CDlgWithAccelerators(UINT nIDTemplate, CWnd* pParentWnd = NULL);
CDlgWithAccelerators(LPCTSTR lpszTemplateName, CWnd* pParentWnd = NULL);
~CDlgWithAccelerators();
protected:
HACCEL m_hAccel; // accelerator table
// MFC overrides
virtual BOOL OnInitDialog();
virtual BOOL PreTranslateMessage(MSG* pMsg);
DECLARE_MESSAGE_MAP()
};
///////////////////////////////////////////
// CDlgWithAccelerators is a general-purpose class that adds accelerators to CDialog.
#include "stdafx.h"
#include "dlgaccel.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
BEGIN_MESSAGE_MAP(CDlgWithAccelerators,CDialog)
END_MESSAGE_MAP()
CDlgWithAccelerators::CDlgWithAccelerators(LPCTSTR lpszTemplateName,
CWnd* pParentWnd) : CDialog(lpszTemplateName, pParentWnd)
{}
CDlgWithAccelerators::CDlgWithAccelerators(UINT nIDTemplate,
CWnd* pParentWnd) : CDialog(nIDTemplate, pParentWnd)
{}
CDlgWithAccelerators::~CDlgWithAccelerators()
{}
/////////////////////////// Pre-translate message: translate keystrokes using acclerator table.
BOOL CDlgWithAccelerators::PreTranslateMessage(MSG* pMsg)
{
if (WM_KEYFIRST <= pMsg->message && pMsg->message <= WM_KEYLAST) {
HACCEL hAccel = m_hAccel;
if (hAccel && ::TranslateAccelerator(m_hWnd, hAccel, pMsg))
return TRUE;
}
return CDialog::PreTranslateMessage(pMsg);
}
//////////////////// Initialize dialog: load accelerators
BOOL CDlgWithAccelerators::OnInitDialog()
{
BOOL bRet = CDialog::OnInitDialog();
// Load dialog's accelerators
m_hAccel = ::LoadAccelerators(AfxGetResourceHandle(),
m_lpszTemplateName); // use same resource name as dialog
return bRet;
}
/////////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "resource.h"
#include "dlgaccel.h"
#include "TraceWin.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
/////////////MFC app
class CMyApp : public CWinApp {
public:
CMyApp();
~CMyApp();
virtual BOOL InitInstance();
DECLARE_MESSAGE_MAP()
};
CMyApp theApp; // THE one-and-only app
//////////// frame window
class CMainFrame : public CFrameWnd {
protected:
virtual BOOL PreCreateWindow(CREATESTRUCT& cs);
public:
CMainFrame();
~CMainFrame();
};
//////////////////// Typical dialog
class CMyDlg : public CDlgWithAccelerators {
public:
CMyDlg(CWnd* pParent = NULL); // standard constructor
protected:
HICON m_hIcon;
void NextInTabOrder();
// MFC overrides
virtual BOOL OnInitDialog();
afx_msg void OnMyEnter();
afx_msg LRESULT OnGetDefID(WPARAM wp, LPARAM lp);
DECLARE_MESSAGE_MAP()
};
BEGIN_MESSAGE_MAP(CMyApp, CWinApp)
END_MESSAGE_MAP()
CMyApp::CMyApp()
{
// nothing to do
}
CMyApp::~CMyApp()
{
// nothing to do
}
//////////////////// InitInstance: create dialog as child
BOOL CMyApp::InitInstance()
{
// create frame window and load it
CMainFrame* pFrame = new CMainFrame;
m_pMainWnd = pFrame;
pFrame->LoadFrame(IDR_MAINFRAME, WS_OVERLAPPED, NULL, NULL);
CMyDlg dlg(pFrame); // create dialog and run it
int nResponse = dlg.DoModal();
if (nResponse == IDOK)
{}
else if (nResponse == IDCANCEL)
{}
return FALSE; // quit
}
CMainFrame::CMainFrame()
{
// nothing to do
}
CMainFrame::~CMainFrame()
{
// nothing to do
}
///////////// Pre-create window: set WS_EX_TOOLWINDOW style to hide dialog from task bar
BOOL CMainFrame::PreCreateWindow(CREATESTRUCT& cs)
{
if (CFrameWnd::PreCreateWindow(cs)) {
cs.dwExStyle |= WS_EX_TOOLWINDOW;
return TRUE;
}
return FALSE;
}
BEGIN_MESSAGE_MAP(CMyDlg, CDlgWithAccelerators)
ON_COMMAND(ID_MY_ENTER, OnMyEnter)
// The following is NOT needed since I am using accelerators to map
// ENTER to ID_MY_ENTER. But if all you want to do is ignore the Enter key,
// you can handle DM_GETDEFID as below.
// ON_MESSAGE(DM_GETDEFID, OnGetDefID) // not used
END_MESSAGE_MAP()
CMyDlg::CMyDlg(CWnd* pParent) : CDlgWithAccelerators(IDD_MYDIALOG, pParent)
{}
//////////////////// Initialize dialog:
BOOL CMyDlg::OnInitDialog()
{
CDlgWithAccelerators::OnInitDialog();
// Set the icon for this dialog. The framework does this automatically
// when the application's main window is not a dialog
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
ASSERT(m_hIcon);
SetIcon(m_hIcon, TRUE); // Set big icon
SetIcon(m_hIcon, FALSE); // Set small icon
// use same resource name as dialog to load dialog's accelerators
m_hAccel = ::LoadAccelerators(AfxGetResourceHandle(),m_lpszTemplateName);
ASSERT(m_hAccel);
return TRUE; // return TRUE unless you set the focus to a control
}
//////////////////// This is called to handle ID_MY_ENTER--ie, Enter key.
void CMyDlg::OnMyEnter()
{
TRACE(_T("CMyDlg::OnMyEnter/n"));
NextInTabOrder(); // move to next control
}
//////////////////// Helper function to move focus to the next control.
void CMyDlg::NextInTabOrder()
{
CWnd* pWndNext = GetNextDlgTabItem(GetFocus());
if (pWndNext) {
pWndNext->SetFocus();
}
}
//////////////////
// This function is not used, since its message map entry is commented out.
// If all you want to do is ignore the Enter key (not map it to a command),
// then all you have to do is return zero here. Note that you MUST return
// the special code DC_HASDEFID in the high-order word!!
LRESULT CMyDlg::OnGetDefID(WPARAM wp, LPARAM lp)
{
TRACE(_T("CMyDlg::OnGetDefID/n"));
return MAKELONG(0,DC_HASDEFID);
} |
四、小结
综上所述，MFC中为对话框添加加速键功能的方法就是：加载加速键和重载PreTranslateMessage（）函数。也就是说，如果开发人员决定在对话框中使用加速键，不用去操心OnGetDefID（）函数的处理，而是要重点实现加速键对应的WM_COMMAND消息响应处理函数。
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