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Accelerators and WTL Dialogs

, 23 Mar 2006
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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 Pinmemberwejr16-Apr-09 9:25 
GeneralCAccelerator PinmemberIgor Vigdorchik2-Oct-06 17:58 
QuestionHow can I use this for a modeless dialog? Pinmemberhanjack5-Sep-06 16:02 
Questiondifferent accelerator schema for each dialog? PinmemberMihai Moga23-Mar-06 22:22 
AnswerRe: different accelerator schema for each dialog? Pinmemberrbuchana24-Mar-06 16:20 
GeneralRe: different accelerator schema for each dialog? PinmemberPablo Aliskevicius18-Jul-06 0:59 

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