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Processing accelerators in a dialog box in Win32 C++

Posted on 2001-06-02
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Last Modified: 2013-12-03
I'm creating a program in Win32 C++ that's a dialog-box based app. How can I get the accelerators that work in the main window to work in the dialog box?
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Question by:cshlin
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4 Comments
 
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Expert Comment

by:robpitt
ID: 6150119
Normally you would do a LoadAccelerator() and then add a TranslateAccelerator() call to your main message loop. The problem is that for modal dialog boxes you don't have access to that main message loop.

There are two fixes:

1) Don't use a modal dialog box. Instead use a modeless one and implement a message loop (GetMessage, TransalateAccelerate etc)

*or*

2) Continue using a modal dialog but also add a thread specific WH_MSGFILTER hook (see SetwindowsHookEx). Then in the hook filter you can call TranslateAccelerator and only if TranslateAccelerator doesn't handle the message do you call CallNextHookEx.


Rob
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by:cshlin
ID: 6150154
Rob,
  Sounds like the kind of thing I've been finding from info searches, but can you elaborate more on how to do step 1 (a bit of sample code for message loop and where to put it)? I'm fairly new at this :)
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robpitt earned 100 total points
ID: 6150244
Something like...



hAccel=LoadAccelerator(...)
hWnd=CreateDialog(...)
ShowWindow(hWnd,SW_SHOWDEFAULT)

while (GetMessage(&msg,NULL,0,0)>0)
{
    if (!TranslateAccelerator(msg.hwnd,hAccel,&msg) &&
        !IsDialogMessage(hWnd,&msg) )
    {
        TranslateMessage(&msg)
        DispatchMessage(&msg)
    }
}

Note : if using the above your DialogProc should call PostQuitMessage() to finish and not EndDialog() as in modal dialog boxes.



Rob




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Author Comment

by:cshlin
ID: 6151786
Thanks a lot Rob, it works :)
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