Thread: MessageBox-a-like

Well why not. At least Wine code is doing it.

Code:

    /* Get the text size */
    GetClientRect(GetDlgItem(hwnd, MSGBOX_IDTEXT), &rect);
    rect.top = rect.left = rect.bottom = 0;
    DrawTextA( hdc, lpszText, -1, &rect,
	       DT_LEFT | DT_EXPANDTABS | DT_WORDBREAK | DT_CALCRECT);
    /* Min text width corresponds to space for the buttons */
    tleft = 2 * ileft + iwidth;
    twidth = max((bw + bspace) * buttons + bspace - tleft, rect.right);
    theight = rect.bottom;

And after that they are calling SetWindowPos() for the buttons.

Code:

    /* Position the buttons */
    bpos = (wwidth - (bw + bspace) * buttons + bspace) / 2;
    for (buttons = i = 0; i < 7; i++) {
       /* some arithmetic to get the right order for YesNoCancel windows */
       hItem = GetDlgItem(hwnd, (i + 5) % 7 + 1);
       if (GetWindowLongA(hItem, GWL_STYLE) & WS_VISIBLE) {
          if (buttons++ == ((lpmb->dwStyle & MB_DEFMASK) >> 8)) {
             SetFocus(hItem);
             SendMessageA( hItem, BM_SETSTYLE, BS_DEFPUSHBUTTON, TRUE );
          }
          SetWindowPos(hItem, 0, bpos, tiheight, bw, bh,
                SWP_NOZORDER|SWP_NOACTIVATE|SWP_NOREDRAW);
          bpos += bw + bspace;
       }
   }

In this code you can see some Wine internals, but you should be
able to change it to your own data structs.

And all of the above is done at WM_INITDIALOG.

Delf