window.cpp

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        // Do a recursive search.
        wxWindow *wnd = parent->FindItemByHWND(hWnd);
        if ( wnd )
            return wnd;

        if ( !controlOnly
#if wxUSE_CONTROLS
                || parent->IsKindOf(CLASSINFO(wxControl))
#endif // wxUSE_CONTROLS
           )
        {
            wxWindow *item = current->GetData();
            if ( item->GetHWND() == hWnd )
                return item;
            else
            {
                if ( item->ContainsHWND(hWnd) )
                    return item;
            }
        }

        current = current->GetNext();
    }
    return NULL;
}

// Default command handler
bool wxWindowMSW::MSWCommand(WXUINT WXUNUSED(param), WXWORD WXUNUSED(id))
{
    return false;
}

// ----------------------------------------------------------------------------
// constructors and such
// ----------------------------------------------------------------------------

void wxWindowMSW::Init()
{
    // MSW specific
    m_isBeingDeleted = false;
    m_oldWndProc = NULL;
    m_mouseInWindow = false;
    m_lastKeydownProcessed = false;

    m_childrenDisabled = NULL;
    m_frozenness = 0;

    m_hWnd = 0;
    m_hDWP = 0;

    m_xThumbSize = 0;
    m_yThumbSize = 0;

#if wxUSE_MOUSEEVENT_HACK
    m_lastMouseX =
    m_lastMouseY = -1;
    m_lastMouseEvent = -1;
#endif // wxUSE_MOUSEEVENT_HACK

    m_pendingPosition = wxDefaultPosition;
    m_pendingSize = wxDefaultSize;
    
#ifdef __POCKETPC__
    m_contextMenuEnabled = false;
#endif
}

// Destructor
wxWindowMSW::~wxWindowMSW()
{
    m_isBeingDeleted = true;

#ifndef __WXUNIVERSAL__
    // VS: make sure there's no wxFrame with last focus set to us:
    for ( wxWindow *win = GetParent(); win; win = win->GetParent() )
    {
        wxTopLevelWindow *frame = wxDynamicCast(win, wxTopLevelWindow);
        if ( frame )
        {
            if ( frame->GetLastFocus() == this )
            {
                frame->SetLastFocus(NULL);
            }

            // apparently sometimes we can end up with our grand parent
            // pointing to us as well: this is surely a bug in focus handling
            // code but it's not clear where it happens so for now just try to
            // fix it here by not breaking out of the loop
            //break;
        }
    }
#endif // __WXUNIVERSAL__

    // VS: destroy children first and _then_ detach *this from its parent.
    //     If we'd do it the other way around, children wouldn't be able
    //     find their parent frame (see above).
    DestroyChildren();

    if ( m_hWnd )
    {
        // VZ: test temp removed to understand what really happens here
        //if (::IsWindow(GetHwnd()))
        {
            if ( !::DestroyWindow(GetHwnd()) )
                wxLogLastError(wxT("DestroyWindow"));
        }

        // remove hWnd <-> wxWindow association
        wxRemoveHandleAssociation(this);
    }

    delete m_childrenDisabled;

}

// real construction (Init() must have been called before!)
bool wxWindowMSW::Create(wxWindow *parent,
                         wxWindowID id,
                         const wxPoint& pos,
                         const wxSize& size,
                         long style,
                         const wxString& name)
{
    wxCHECK_MSG( parent, false, wxT("can't create wxWindow without parent") );

    if ( !CreateBase(parent, id, pos, size, style, wxDefaultValidator, name) )
        return false;

    parent->AddChild(this);

    WXDWORD exstyle;
    DWORD msflags = MSWGetCreateWindowFlags(&exstyle);

#ifdef __WXUNIVERSAL__
    // no borders, we draw them ourselves
    exstyle &= ~(WS_EX_DLGMODALFRAME |
                 WS_EX_STATICEDGE |
                 WS_EX_CLIENTEDGE |
                 WS_EX_WINDOWEDGE);
    msflags &= ~WS_BORDER;
#endif // wxUniversal

    if ( IsShown() )
    {
        msflags |= WS_VISIBLE;
    }

    if ( !MSWCreate(wxCanvasClassName, NULL, pos, size, msflags, exstyle) )
        return false;

    InheritAttributes();

    return true;
}

// ---------------------------------------------------------------------------
// basic operations
// ---------------------------------------------------------------------------

void wxWindowMSW::SetFocus()
{
    HWND hWnd = GetHwnd();
    wxCHECK_RET( hWnd, _T("can't set focus to invalid window") );

#if !defined(__WXMICROWIN__) && !defined(__WXWINCE__)
    ::SetLastError(0);
#endif

    if ( !::SetFocus(hWnd) )
    {
#if defined(__WXDEBUG__) && !defined(__WXMICROWIN__)
        // was there really an error?
        DWORD dwRes = ::GetLastError();
        if ( dwRes )
        {
            HWND hwndFocus = ::GetFocus();
            if ( hwndFocus != hWnd )
            {
                wxLogApiError(_T("SetFocus"), dwRes);
            }
        }
#endif // Debug
    }
}

void wxWindowMSW::SetFocusFromKbd()
{
    // when the focus is given to the control with DLGC_HASSETSEL style from
    // keyboard its contents should be entirely selected: this is what
    // ::IsDialogMessage() does and so we should do it as well to provide the
    // same LNF as the native programs
    if ( ::SendMessage(GetHwnd(), WM_GETDLGCODE, 0, 0) & DLGC_HASSETSEL )
    {
        ::SendMessage(GetHwnd(), EM_SETSEL, 0, -1);
    }

    // do this after (maybe) setting the selection as like this when
    // wxEVT_SET_FOCUS handler is called, the selection would have been already
    // set correctly -- this may be important
    wxWindowBase::SetFocusFromKbd();
}

// Get the window with the focus
wxWindow *wxWindowBase::DoFindFocus()
{
    HWND hWnd = ::GetFocus();
    if ( hWnd )
    {
        return wxGetWindowFromHWND((WXHWND)hWnd);
    }

    return NULL;
}

bool wxWindowMSW::Enable(bool enable)
{
    if ( !wxWindowBase::Enable(enable) )
        return false;

    HWND hWnd = GetHwnd();
    if ( hWnd )
        ::EnableWindow(hWnd, (BOOL)enable);

    // the logic below doesn't apply to the top level windows -- otherwise
    // showing a modal dialog would result in total greying out (and ungreying
    // out later) of everything which would be really ugly
    if ( IsTopLevel() )
        return true;

    // when the parent is disabled, all of its children should be disabled as
    // well but when it is enabled back, only those of the children which
    // hadn't been already disabled in the beginning should be enabled again,
    // so we have to keep the list of those children
    for ( wxWindowList::compatibility_iterator node = GetChildren().GetFirst();
          node;
          node = node->GetNext() )
    {
        wxWindow *child = node->GetData();
        if ( child->IsTopLevel() )
        {
            // the logic below doesn't apply to top level children
            continue;
        }

        if ( enable )
        {
            // enable the child back unless it had been disabled before us
            if ( !m_childrenDisabled || !m_childrenDisabled->Find(child) )
                child->Enable();
        }
        else // we're being disabled
        {
            if ( child->IsEnabled() )
            {
                // disable it as children shouldn't stay enabled while the
                // parent is not
                child->Disable();
            }
            else // child already disabled, remember it
            {
                // have we created the list of disabled children already?
                if ( !m_childrenDisabled )
                    m_childrenDisabled = new wxWindowList;

                m_childrenDisabled->Append(child);
            }
        }
    }

    if ( enable && m_childrenDisabled )
    {
        // we don't need this list any more, don't keep unused memory
        delete m_childrenDisabled;
        m_childrenDisabled = NULL;
    }

    return true;
}

bool wxWindowMSW::Show(bool show)
{
    if ( !wxWindowBase::Show(show) )
        return false;

    HWND hWnd = GetHwnd();
    int cshow = show ? SW_SHOW : SW_HIDE;
    ::ShowWindow(hWnd, cshow);

    if ( show && IsTopLevel() )
    {
        wxBringWindowToTop(hWnd);
    }

    return true;
}

// Raise the window to the top of the Z order
void wxWindowMSW::Raise()
{
    wxBringWindowToTop(GetHwnd());
}

// Lower the window to the bottom of the Z order
void wxWindowMSW::Lower()
{
    ::SetWindowPos(GetHwnd(), HWND_BOTTOM, 0, 0, 0, 0,
                   SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE);
}

void wxWindowMSW::SetTitle( const wxString& title)
{
    SetWindowText(GetHwnd(), title.c_str());
}

wxString wxWindowMSW::GetTitle() const
{
    return wxGetWindowText(GetHWND());
}

void wxWindowMSW::DoCaptureMouse()
{
    HWND hWnd = GetHwnd();
    if ( hWnd )
    {
        ::SetCapture(hWnd);
    }
}

void wxWindowMSW::DoReleaseMouse()
{
    if ( !::ReleaseCapture() )
    {
        wxLogLastError(_T("ReleaseCapture"));
    }
}

/* static */ wxWindow *wxWindowBase::GetCapture()
{
    HWND hwnd = ::GetCapture();
    return hwnd ? wxFindWinFromHandle((WXHWND)hwnd) : (wxWindow *)NULL;
}

bool wxWindowMSW::SetFont(const wxFont& font)
{
    if ( !wxWindowBase::SetFont(font) )
    {
        // nothing to do
        return false;
    }

    HWND hWnd = GetHwnd();
    if ( hWnd != 0 )
    {
        WXHANDLE hFont = m_font.GetResourceHandle();

        wxASSERT_MSG( hFont, wxT("should have valid font") );

        ::SendMessage(hWnd, WM_SETFONT, (WPARAM)hFont, MAKELPARAM(TRUE, 0));
    }

    return true;
}
bool wxWindowMSW::SetCursor(const wxCursor& cursor)
{
    if ( !wxWindowBase::SetCursor(cursor) )
    {
        // no change
        return false;
    }

    if ( m_cursor.Ok() )
    {
        HWND hWnd = GetHwnd();

        // Change the cursor NOW if we're within the correct window
        POINT point;
#ifdef __WXWINCE__
        ::GetCursorPosWinCE(&point);
#else
        ::GetCursorPos(&point);
#endif

        RECT rect = wxGetWindowRect(hWnd);

        if ( ::PtInRect(&rect, point) && !wxIsBusy() )
            ::SetCursor(GetHcursorOf(m_cursor));
    }

    return true;
}

void wxWindowMSW::WarpPointer(int x, int y)
{
    ClientToScreen(&x, &y);

    if ( !::SetCursorPos(x, y) )
    {
        wxLogLastError(_T("SetCursorPos"));
    }
}

void wxWindowMSW::MSWUpdateUIState()
{
    // WM_CHANGEUISTATE only appeared in Windows 2000 so it can do us no good
    // to use it on older systems -- and could possibly do some harm
    static int s_needToUpdate = -1;
    if ( s_needToUpdate == -1 )
    {
        int verMaj, verMin;
        s_needToUpdate = wxGetOsVersion(&verMaj, &verMin) == wxWINDOWS_NT &&
                            verMaj >= 5;
    }

    if ( s_needToUpdate )
    {
        // we send WM_CHANGEUISTATE so if nothing needs changing then the system
        // won't send WM_UPDATEUISTATE
        ::SendMessage(GetHwnd(), WM_CHANGEUISTATE,
                      MAKEWPARAM(UIS_CLEAR, UISF_HIDEFOCUS), 0);
    }
}

// ---------------------------------------------------------------------------
// scrolling stuff
// ---------------------------------------------------------------------------