window.cpp

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    // get the current size and position...
    int currentX, currentY;
    int currentW, currentH;

    GetPosition(&currentX, &currentY);
    GetSize(&currentW, &currentH);

    // ... and don't do anything (avoiding flicker) if it's already ok unless
    // we're forced to resize the window
    if ( x == currentX && y == currentY &&
         width == currentW && height == currentH &&
            !(sizeFlags & wxSIZE_FORCE) )
    {
        return;
    }

    if ( x == wxDefaultCoord && !(sizeFlags & wxSIZE_ALLOW_MINUS_ONE) )
        x = currentX;
    if ( y == wxDefaultCoord && !(sizeFlags & wxSIZE_ALLOW_MINUS_ONE) )
        y = currentY;

    AdjustForParentClientOrigin(x, y, sizeFlags);

    wxSize size = wxDefaultSize;
    if ( width == wxDefaultCoord )
    {
        if ( sizeFlags & wxSIZE_AUTO_WIDTH )
        {
            size = DoGetBestSize();
            width = size.x;
        }
        else
        {
            // just take the current one
            width = currentW;
        }
    }

    if ( height == wxDefaultCoord )
    {
        if ( sizeFlags & wxSIZE_AUTO_HEIGHT )
        {
            if ( size.x == wxDefaultCoord )
            {
                size = DoGetBestSize();
            }
            //else: already called DoGetBestSize() above

            height = size.y;
        }
        else
        {
            // just take the current one
            height = currentH;
        }
    }

    DoMoveWindow(x, y, width, height);
}

void wxWindowMSW::DoSetClientSize(int width, int height)
{
    // setting the client size is less obvious than it it could have been
    // because in the result of changing the total size the window scrollbar
    // may [dis]appear and/or its menubar may [un]wrap and so the client size
    // will not be correct as the difference between the total and client size
    // changes - so we keep changing it until we get it right
    //
    // normally this loop shouldn't take more than 3 iterations (usually 1 but
    // if scrollbars [dis]appear as the result of the first call, then 2 and it
    // may become 3 if the window had 0 size originally and so we didn't
    // calculate the scrollbar correction correctly during the first iteration)
    // but just to be on the safe side we check for it instead of making it an
    // "infinite" loop (i.e. leaving break inside as the only way to get out)
    for ( int i = 0; i < 4; i++ )
    {
        RECT rectClient;
        ::GetClientRect(GetHwnd(), &rectClient);

        // if the size is already ok, stop here (NB: rectClient.left = top = 0)
        if ( (rectClient.right == width || width == wxDefaultCoord) &&
             (rectClient.bottom == height || height == wxDefaultCoord) )
        {
            break;
        }

        // Find the difference between the entire window (title bar and all)
        // and the client area; add this to the new client size to move the
        // window
        RECT rectWin;
        ::GetWindowRect(GetHwnd(), &rectWin);

        const int widthWin = rectWin.right - rectWin.left,
                  heightWin = rectWin.bottom - rectWin.top;

        // MoveWindow positions the child windows relative to the parent, so
        // adjust if necessary
        if ( !IsTopLevel() )
        {
            wxWindow *parent = GetParent();
            if ( parent )
            {
                ::ScreenToClient(GetHwndOf(parent), (POINT *)&rectWin);
            }
        }

        // don't call DoMoveWindow() because we want to move window immediately
        // and not defer it here
        if ( !::MoveWindow(GetHwnd(),
                           rectWin.left,
                           rectWin.top,
                           width + widthWin - rectClient.right,
                           height + heightWin - rectClient.bottom,
                           TRUE) )
        {
            wxLogLastError(_T("MoveWindow"));
        }
    }
}

// ---------------------------------------------------------------------------
// text metrics
// ---------------------------------------------------------------------------

int wxWindowMSW::GetCharHeight() const
{
    return wxGetTextMetrics(this).tmHeight;
}

int wxWindowMSW::GetCharWidth() const
{
    // +1 is needed because Windows apparently adds it when calculating the
    // dialog units size in pixels
#if wxDIALOG_UNIT_COMPATIBILITY
    return wxGetTextMetrics(this).tmAveCharWidth;
#else
    return wxGetTextMetrics(this).tmAveCharWidth + 1;
#endif
}

void wxWindowMSW::GetTextExtent(const wxString& string,
                             int *x, int *y,
                             int *descent, int *externalLeading,
                             const wxFont *theFont) const
{
    wxASSERT_MSG( !theFont || theFont->Ok(),
                    _T("invalid font in GetTextExtent()") );

    wxFont fontToUse;
    if (theFont)
        fontToUse = *theFont;
    else
        fontToUse = GetFont();

    WindowHDC hdc(GetHwnd());
    SelectInHDC selectFont(hdc, GetHfontOf(fontToUse));

    SIZE sizeRect;
    TEXTMETRIC tm;
    ::GetTextExtentPoint32(hdc, string, string.length(), &sizeRect);
    GetTextMetrics(hdc, &tm);

    if ( x )
        *x = sizeRect.cx;
    if ( y )
        *y = sizeRect.cy;
    if ( descent )
        *descent = tm.tmDescent;
    if ( externalLeading )
        *externalLeading = tm.tmExternalLeading;
}

// ---------------------------------------------------------------------------
// popup menu
// ---------------------------------------------------------------------------

#if wxUSE_MENUS_NATIVE

// yield for WM_COMMAND events only, i.e. process all WM_COMMANDs in the queue
// immediately, without waiting for the next event loop iteration
//
// NB: this function should probably be made public later as it can almost
//     surely replace wxYield() elsewhere as well
static void wxYieldForCommandsOnly()
{
    // peek all WM_COMMANDs (it will always return WM_QUIT too but we don't
    // want to process it here)
    MSG msg;
    while ( ::PeekMessage(&msg, (HWND)0, WM_COMMAND, WM_COMMAND, PM_REMOVE) )
    {
        if ( msg.message == WM_QUIT )
        {
            // if we retrieved a WM_QUIT, insert back into the message queue.
            ::PostQuitMessage(0);
            break;
        }

        // luckily (as we don't have access to wxEventLoopImpl method from here
        // anyhow...) we don't need to pre process WM_COMMANDs so dispatch it
        // immediately
        ::TranslateMessage(&msg);
        ::DispatchMessage(&msg);
    }
}

bool wxWindowMSW::DoPopupMenu(wxMenu *menu, int x, int y)
{
    menu->SetInvokingWindow(this);
    menu->UpdateUI();

    if ( x == wxDefaultCoord && y == wxDefaultCoord )
    {
        wxPoint mouse = ScreenToClient(wxGetMousePosition());
        x = mouse.x; y = mouse.y;
    }

    HWND hWnd = GetHwnd();
    HMENU hMenu = GetHmenuOf(menu);
    POINT point;
    point.x = x;
    point.y = y;
    ::ClientToScreen(hWnd, &point);
    wxCurrentPopupMenu = menu;
#if defined(__WXWINCE__)
    UINT flags = 0;
#else
    UINT flags = TPM_RIGHTBUTTON;
#endif
    ::TrackPopupMenu(hMenu, flags, point.x, point.y, 0, hWnd, NULL);

    // we need to do it righ now as otherwise the events are never going to be
    // sent to wxCurrentPopupMenu from HandleCommand()
    //
    // note that even eliminating (ugly) wxCurrentPopupMenu global wouldn't
    // help and we'd still need wxYieldForCommandsOnly() as the menu may be
    // destroyed as soon as we return (it can be a local variable in the caller
    // for example) and so we do need to process the event immediately
    wxYieldForCommandsOnly();

    wxCurrentPopupMenu = NULL;

    menu->SetInvokingWindow(NULL);

    return true;
}

#endif // wxUSE_MENUS_NATIVE

// ===========================================================================
// pre/post message processing
// ===========================================================================

WXLRESULT wxWindowMSW::MSWDefWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
{
    if ( m_oldWndProc )
        return ::CallWindowProc(CASTWNDPROC m_oldWndProc, GetHwnd(), (UINT) nMsg, (WPARAM) wParam, (LPARAM) lParam);
    else
        return ::DefWindowProc(GetHwnd(), nMsg, wParam, lParam);
}

bool wxWindowMSW::MSWProcessMessage(WXMSG* pMsg)
{
    // wxUniversal implements tab traversal itself
#ifndef __WXUNIVERSAL__
    if ( m_hWnd != 0 && (GetWindowStyleFlag() & wxTAB_TRAVERSAL) )
    {
        // intercept dialog navigation keys
        MSG *msg = (MSG *)pMsg;

        // here we try to do all the job which ::IsDialogMessage() usually does
        // internally
        if ( msg->message == WM_KEYDOWN )
        {
            bool bCtrlDown = wxIsCtrlDown();
            bool bShiftDown = wxIsShiftDown();

            // WM_GETDLGCODE: ask the control if it wants the key for itself,
            // don't process it if it's the case (except for Ctrl-Tab/Enter
            // combinations which are always processed)
            LONG lDlgCode = 0;
            if ( !bCtrlDown )
            {
                lDlgCode = ::SendMessage(msg->hwnd, WM_GETDLGCODE, 0, 0);

                // surprizingly, DLGC_WANTALLKEYS bit mask doesn't contain the
                // DLGC_WANTTAB nor DLGC_WANTARROWS bits although, logically,
                // it, of course, implies them
                if ( lDlgCode & DLGC_WANTALLKEYS )
                {
                    lDlgCode |= DLGC_WANTTAB | DLGC_WANTARROWS;
                }
            }

            bool bForward = true,
                 bWindowChange = false,
                 bFromTab = false;

            // should we process this message specially?
            bool bProcess = true;
            switch ( msg->wParam )
            {
                case VK_TAB:
                    if ( lDlgCode & DLGC_WANTTAB ) {
                        bProcess = false;
                    }
                    else {
                        // Ctrl-Tab cycles thru notebook pages
                        bWindowChange = bCtrlDown;
                        bForward = !bShiftDown;
                        bFromTab = true;
                    }
                    break;

                case VK_UP:
                case VK_LEFT:
                    if ( (lDlgCode & DLGC_WANTARROWS) || bCtrlDown )
                        bProcess = false;
                    else
                        bForward = false;
                    break;

                case VK_DOWN:
                case VK_RIGHT:
                    if ( (lDlgCode & DLGC_WANTARROWS) || bCtrlDown )
                        bProcess = false;
                    break;

                case VK_RETURN:
                    {
                        if ( (lDlgCode & DLGC_WANTMESSAGE) && !bCtrlDown )
                        {
                            // control wants to process Enter itself, don't
                            // call IsDialogMessage() which would interpret
                            // it
                            return false;
                        }

                        // currently active button should get enter press even
                        // if there is a default button elsewhere
                        if ( lDlgCode & DLGC_DEFPUSHBUTTON )
                        {
                            // let IsDialogMessage() handle this for all
                            // buttons except the owner-drawn ones which it
                            // just seems to ignore
                            long style = ::GetWindowLong(msg->hwnd, GWL_STYLE);
                            if ( (style & BS_OWNERDRAW) == BS_OWNERDRAW )
                            {
                                // emulate the button click
                                wxWindow *
                                    btn = wxFindWinFromHandle((WXHWND)msg->hwnd);
                                if ( btn )
                                    btn->MSWCommand(BN_CLICKED, 0 /* unused */);
                            }

                            bProcess = false;
                        }
                        else // not a button itself
                        {
#if wxUSE_BUTTON
                            wxButton *btn = wxDynamicCast(GetDefaultItem(),
                                                          wxButton);
                            if ( btn && btn->IsEnabled() )
                            {
                                // if we do have a default button, do press it
                                btn->MSWCommand(BN_CLICKED, 0 /* unused */);

                                return true;
                            }
                            else // no default button
#endif // wxUSE_BUTTON
                            {
                                // this is a quick and dirty test for a text
                                // control
                                if ( !(lDlgCode & DLGC_HASSETSEL) )
                                {
                                    // don't process Enter, the control might
                                    // need it for itself and don't let
                                    // ::IsDialogMessage() have it as it can
                                    // eat the Enter events sometimes
                                    return false;
                                }
                                else if (!IsTopLevel())
                                {
                                    // if not a top level window, let parent
                                    // handle it
                                    return false;
                                }
                                //else: treat Enter as TAB: pass to the next
                                //      control as this is the best thing to do
                                //      if the text doesn't handle Enter itself
                            }
                        }
                    }
                    break;

                default:
                    bProcess = false;
            }

            if ( bProcess )
            {
                wxNavigationKeyEvent event;
                event.SetDirection(bForward);
                event.SetWindowChange(bWindowChange);
                event.SetFromTab(bFromTab);
                event.SetEventObject(this);

                if ( GetEventHandler()->ProcessEvent(event) )
                {
                    // as we don't call IsDialogMessage(), which would take of
                    // this by default, we need to manually send this message
                    // so that controls could change their appearance
                    // appropriately
                    MSWUpdateUIState();

                    return true;
                }
            }
        }

        // don't let IsDialogMessage() get VK_ESCAPE as it _always_ eats the
        // message even when there is no cancel button and when the message is
        // needed by the control itself: in particular, it prevents the tree