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Posted 23 Mar 2006


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Accelerators and WTL Dialogs

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23 Mar 2006
An article on using accelerators in WTL dialogs.



I searched and searched the CodeProject but never found an example on using accelerators and WTL dialogs. I have used accelerators in MFC dialogs extensively, but couldn't figure out how to add this functionality to WTL dialogs. Like a lot of things, it is very easy to do once you have figured it out. Well, here goes....

Using the code

Declare a handle to the accelerator, and add the CMessageFilter if it has not been done already.

#pragma once

class CMainDlg : public CDialogImpl<CMainDlg>, 
         public CUpdateUI<CMainDlg>,
         public CMessageFilter, 
         public CIdleHandler
    HACCEL    m_haccelerator;

Then in your OnInitDialog, assign the m_haccelerator variable to the accelerator resource, which in this example is IDR_MAINFRAME.

LRESULT CMainDlg::OnInitDialog(UINT /*uMsg*/, WPARAM /*wParam*/, 
        LPARAM /*lParam*/, BOOL& /*bHandled*/)
    // .......

    //Bind keys...
    m_haccelerator = AtlLoadAccelerators(IDR_MAINFRAME);

    // register object for message filtering and idle updates    
    CMessageLoop* pLoop = _Module.GetMessageLoop();
    ATLASSERT(pLoop != NULL);


    return TRUE;

Then we need to overload the PreTranslateMessage function...

BOOL CMainDlg::PreTranslateMessage(MSG* pMsg)
    if(m_haccelerator != NULL)
        if(::TranslateAccelerator(m_hWnd, m_haccelerator, pMsg))
            return TRUE;

    return CWindow::IsDialogMessage(pMsg);

Also, in you constructor, initialize the handle to the accelerator.


    m_haccelerator = NULL;


If the dialog wasn't made to be modeless, it needs to be for the PreTranslateMessage to work. This is easily done by...

int WINAPI _tWinMain(HINSTANCE hInstance, 
    HINSTANCE /*hPrevInstance*/, LPTSTR lpstrCmdLine, int nCmdShow)
    _Module.Init(NULL, hInstance);

    CMessageLoop myMessageLoop;

    CMainDlg dlgMain;

    int retValue = myMessageLoop.Run();


    return retValue;

And make sure you include atlmisc.h.


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About the Author

Rory Buchanan
United States United States
No Biography provided

Comments and Discussions

QuestionCopy/Paste Pin
wejr16-Apr-09 8:25
Memberwejr16-Apr-09 8:25 
GeneralCAccelerator Pin
Igor Vigdorchik2-Oct-06 16:58
MemberIgor Vigdorchik2-Oct-06 16:58 
QuestionHow can I use this for a modeless dialog? Pin
hanjack5-Sep-06 15:02
Memberhanjack5-Sep-06 15:02 
Questiondifferent accelerator schema for each dialog? Pin
Ștefan-Mihai MOGA23-Mar-06 21:22
professionalȘtefan-Mihai MOGA23-Mar-06 21:22 
AnswerRe: different accelerator schema for each dialog? Pin
rbuchana24-Mar-06 15:20
Memberrbuchana24-Mar-06 15:20 
GeneralRe: different accelerator schema for each dialog? Pin
Pablo Aliskevicius17-Jul-06 23:59
MemberPablo Aliskevicius17-Jul-06 23:59 

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