Thread: tab control

Seems like tab controls with the TCS_HOTTRACK style don't like to be created with (HMENU)identifiers (return value from GetLastError called immediately after CreateWindowEx is 1401: Invalid menu handle).

So, you might want to create the control without an identifier and then use SetWindowLongPtr with an nIndex value of GWL_ID(or GWLP_ID, if defined) once it's been created. I noticed it also seems to have a problem with its parentage, too, and wasn't created within the parent client area - a call to SetParent, again after the control is created fixed this. This problem, too, seems to be as a direct result of the presence of the TCS_HOTTRACK style.

You may also be interested in testing for the presence of hot-tracking with SystemParametersInfo (SPI_GETHOTTRACKING) if you're not already doing so.

Wow, thats a lot of things not explained in the MSDN! Now what value am I setting the call of SetWindowLongPtr(hTC_Wnd, GWL_STYLE, ???). Do I set this as TCS_HOTTRACK? cause if so I don't get why I would have to do this afterwards, when I should be able to just set that style during the CreateWindowEx call couldn't I? In which case wouldn't I call CreateWindowEx with an identifier to start with? Sorry, just need some clarification there.

Now without calling the SetWindowLongPtr as stated in your last post, I am getting the following error messages. When I call SetParent(hTC_Wnd, hWnd); I get the error value from GetLastError and it's 1400: Invalid window handle. Now hTC_Wnd is the global HWND to the tab control (value returned when CreateWindowEx was called). hWnd is a global HWND set when CreateWindowEx was called to create the main window.

The next error message I get is when I call SystemParametersInfo(SPI_GETHOTTRACKING, 0, &bpvParam, 0); bpvParam being a BOOL that I am passing to get the TRUE (Enabled) or FALSE (Disabled) status of the TCS_HOTTRACKING style being set. I also took the code out of my WM_CREATE message and placed it in the body of WInMain and this caused my tab control to at least resize to the full size of the window, sort of. It looks like the tab doesn't fill the entire window and so there is a chunk of the window that seems to "sink down" lower. Like there is limits to the page sizes.

I know thats a lot for one post. But any clarification you can give would be of great help.

Thanks,
cyreon

PS - totally switching names so it's the same person just different users.

Edit: I even did the following to heavily check for errors during the SystemParametersInfo call:

Code:

// check to make sure that the TCS_HOTTRACKING style was properly set
if( !SystemParametersInfo(SPI_GETHOTTRACKING, 0, &bpvParam, 0) )
{
    sprintf(error, "ERROR: SystemParametersInfo failed! (%u)", GetLastError());
    MessageBox(NULL, error, "Error", MB_ICONEXCLAMATION);
}
else {
    if( bpvParam == TRUE )
        MessageBox(NULL, "HotTracking is not active!", "Error", MB_OK);
}

Edit::Edit: Hot Tracking is actually working when the program runs. But the tab control doesn't seem to quite want to share the look of focus, should I use the tab control style that disables the tab control from getting focus? The titlebar of my window is lighter in colour as if the program doesn't have focus. Maybe this will be fixed once I get SetParent to work?

Actually, ignore that earlier nonsense I posted on account of the fact that it's largely utter balderdash.

The missing style (thankyou tmouse!) is WS_CHILD and this is the beginning and end of your current code problem, ie.:

Code:

hTC_Wnd = CreateWindowEx(0, WC_TABCONTROL, NULL, 
WS_VISIBLE | WS_TABSTOP | WS_BORDER | TCS_HOTTRACK | WS_CHILD, 
rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top, 
hwnd, NULL, g_hInst, NULL);

I can only apologise for any confusion my vain attempt to bash the round peg into the square hole has caused you.

You could try replacing hTC_Wnd with lpnmhdr->hwndFrom as the parameter of TabCtrl_GetCurSel. If that doesn't change things then look to your 'SwitchTabs' function and see if the problem is, in fact, there.