Mouse double click not working for MDI view scrollbar

I have an old MDI application created using SDK method.
Its main view is having scrollbar.

On double clicking on the vertical/horizontal scrollbar, I am able to receive only one click. (Second click is missing. )
That is the vertical scrollbar is getting moved only once. I am not receiving the second mouse click . (ie OnVScrollbar() function is getting called only once.).

And in the MDIWindowProc() function I am handling WM_VSCROLL,WM_LBUTTONDOWN, WM_LBUTTONDBLCLK functions.

Can anyone you please tell me which other function should I subcribe for moving vertical scroll bar twice during mouse double click.


Code snippet used for creating the view is given below

Code:

---

// Register the MDI child class
        wc.style        = CS_DBLCLKS | CS_OWNDC;
        wc.lpfnWndProc        = MDIWndProc;
        wc.hInstance        = _hInst;
        wc.cbClsExtra        = 0;
        wc.cbWndExtra        = MDIWNDEXTRA;
        wc.hbrBackground= (HBRUSH)(COLOR_WINDOW + 1);
//        wc.hbrBackground= COLOR_APPWORKSPACE + 1;
        wc.hIcon        = LoadIcon(_hLib, ID(IDI_ICON1));;
        wc.hCursor        = NULL;
        wc.lpszMenuName        = NULL;
        strcpy(szClass, _szPropertyName);
        strcat(szClass, "MDI");
        wc.lpszClassName= szClass;
        if (!RegisterClass(&wc))
                return FALSE;

---

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Why do you want o handle double click for scrollbars?
IMO you don't need even WM_LBUTTONDOWN.

WM_VSCROLL and WM_HSCROLL are pretty enough to handle scrollbars.

Hi,
Thanks for the reply. I have already handling WM_VSCROLL and WM_HSCROLL. But in my application Scrolbar doesnt take double click correctly. On double click, scroll bar moves only once . It is actually expected to move twice.

Any idea why this is happening?

Thanks
Vin

That's because when a 'double click' occurs, only one WM_LBUTTONDBLCLK message is sent. So, it is only being handled once.

To get both clicks, you will have to handle each click separately. :p

Handle WM_LBUTTONDOWN, standard scroll bars scroll on WM_LBUTTONDOWN (that is, they don't wait for the button to be released) and scroll again on the second WM_LBUTTONDOWN.