checkbox.cpp

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        state = (wxCheckBoxState)((m_state + 1) % 3);
    }
    else // 2 state checkbox (at least from users point of view)
    {
        // note that wxCHK_UNDETERMINED also becomes unchecked when clicked
        state = m_state == wxCHK_UNCHECKED ? wxCHK_CHECKED : wxCHK_UNCHECKED;
    }

    DoSet3StateValue(state);


    // generate the event
    wxCommandEvent event(wxEVT_COMMAND_CHECKBOX_CLICKED, m_windowId);

    event.SetInt(state);
    event.SetEventObject(this);
    ProcessCommand(event);

    return true;
}

// ----------------------------------------------------------------------------
// owner drawn checkboxes stuff
// ----------------------------------------------------------------------------

bool wxCheckBox::SetForegroundColour(const wxColour& colour)
{
    if ( !wxCheckBoxBase::SetForegroundColour(colour) )
        return false;

    // the only way to change the checkbox foreground colour under Windows XP
    // is to owner draw it
    if ( wxUxThemeEngine::GetIfActive() )
        MakeOwnerDrawn(colour.Ok());

    return true;
}

bool wxCheckBox::IsOwnerDrawn() const
{
    return
        (::GetWindowLong(GetHwnd(), GWL_STYLE) & BS_OWNERDRAW) == BS_OWNERDRAW;
}

void wxCheckBox::MakeOwnerDrawn(bool ownerDrawn)
{
    long style = ::GetWindowLong(GetHwnd(), GWL_STYLE);

    // note that BS_CHECKBOX & BS_OWNERDRAW != 0 so we can't operate on
    // them as on independent style bits
    if ( ownerDrawn )
    {
        style &= ~(BS_CHECKBOX | BS_3STATE);
        style |= BS_OWNERDRAW;

        Connect(wxEVT_ENTER_WINDOW,
                wxMouseEventHandler(wxCheckBox::OnMouseEnterOrLeave));
        Connect(wxEVT_LEAVE_WINDOW,
                wxMouseEventHandler(wxCheckBox::OnMouseEnterOrLeave));
        Connect(wxEVT_LEFT_DOWN, wxMouseEventHandler(wxCheckBox::OnMouseLeft));
        Connect(wxEVT_LEFT_UP, wxMouseEventHandler(wxCheckBox::OnMouseLeft));
        Connect(wxEVT_SET_FOCUS, wxFocusEventHandler(wxCheckBox::OnFocus));
        Connect(wxEVT_KILL_FOCUS, wxFocusEventHandler(wxCheckBox::OnFocus));
    }
    else // reset to default colour
    {
        style &= ~BS_OWNERDRAW;
        style |= HasFlag(wxCHK_3STATE) ? BS_3STATE : BS_CHECKBOX;

        Disconnect(wxEVT_ENTER_WINDOW,
                   wxMouseEventHandler(wxCheckBox::OnMouseEnterOrLeave));
        Disconnect(wxEVT_LEAVE_WINDOW,
                   wxMouseEventHandler(wxCheckBox::OnMouseEnterOrLeave));
        Disconnect(wxEVT_LEFT_DOWN, wxMouseEventHandler(wxCheckBox::OnMouseLeft));
        Disconnect(wxEVT_LEFT_UP, wxMouseEventHandler(wxCheckBox::OnMouseLeft));
        Disconnect(wxEVT_SET_FOCUS, wxFocusEventHandler(wxCheckBox::OnFocus));
        Disconnect(wxEVT_KILL_FOCUS, wxFocusEventHandler(wxCheckBox::OnFocus));
    }

    ::SetWindowLong(GetHwnd(), GWL_STYLE, style);

    if ( !ownerDrawn )
    {
        // ensure that controls state is consistent with internal state
        DoSet3StateValue(m_state);
    }
}

void wxCheckBox::OnMouseEnterOrLeave(wxMouseEvent& event)
{
    m_isHot = event.GetEventType() == wxEVT_ENTER_WINDOW;
    if ( !m_isHot )
        m_isPressed = false;

    Refresh();

    event.Skip();
}

void wxCheckBox::OnMouseLeft(wxMouseEvent& event)
{
    // TODO: we should capture the mouse here to be notified about left up
    //       event but this interferes with BN_CLICKED generation so if we
    //       want to do this we'd need to generate them ourselves
    m_isPressed = event.GetEventType() == wxEVT_LEFT_DOWN;
    Refresh();

    event.Skip();
}

void wxCheckBox::OnFocus(wxFocusEvent& event)
{
    Refresh();

    event.Skip();
}

bool wxCheckBox::MSWOnDraw(WXDRAWITEMSTRUCT *item)
{
    DRAWITEMSTRUCT *dis = (DRAWITEMSTRUCT *)item;

    if ( !IsOwnerDrawn() || dis->CtlType != ODT_BUTTON )
        return wxCheckBoxBase::MSWOnDraw(item);

    // calculate the rectangles for the check mark itself and the label
    HDC hdc = dis->hDC;
    RECT& rect = dis->rcItem;
    RECT rectCheck,
         rectLabel;
    rectCheck.top =
    rectLabel.top = rect.top;
    rectCheck.bottom =
    rectLabel.bottom = rect.bottom;
    const int checkSize = GetBestSize().y;
    const int MARGIN = 3;

    const bool isRightAligned = HasFlag(wxALIGN_RIGHT);
    if ( isRightAligned )
    {
        rectCheck.right = rect.right;
        rectCheck.left = rectCheck.right - checkSize;

        rectLabel.right = rectCheck.left - MARGIN;
        rectLabel.left = rect.left;
    }
    else // normal, left-aligned checkbox
    {
        rectCheck.left = rect.left;
        rectCheck.right = rectCheck.left + checkSize;

        rectLabel.left = rectCheck.right + MARGIN;
        rectLabel.right = rect.right;
    }

    // show we draw a focus rect?
    const bool isFocused = m_isPressed || FindFocus() == this;


    // draw the checkbox itself: note that this should really, really be in
    // wxRendererNative but unfortunately we can't add a new virtual function
    // to it without breaking backwards compatibility

    // classic Win32 version -- this can be useful when we move this into
    // wxRendererNative
#if defined(__WXWINCE__) || !wxUSE_UXTHEME
    UINT state = DFCS_BUTTONCHECK;
    if ( !IsEnabled() )
        state |= DFCS_INACTIVE;
    switch ( Get3StateValue() )
    {
        case wxCHK_CHECKED:
            state |= DFCS_CHECKED;
            break;

        case wxCHK_UNDETERMINED:
            state |= DFCS_PUSHED;
            break;

        default:
            wxFAIL_MSG( _T("unexpected Get3StateValue() return value") );
            // fall through

        case wxCHK_UNCHECKED:
            // no extra styles needed
            break;
    }

    if ( wxFindWindowAtPoint(wxGetMousePosition()) == this )
        state |= DFCS_HOT;

    if ( !::DrawFrameControl(hdc, &rectCheck, DFC_BUTTON, state) )
    {
        wxLogLastError(_T("DrawFrameControl(DFC_BUTTON)"));
    }
#else // XP version
    wxUxThemeEngine *themeEngine = wxUxThemeEngine::GetIfActive();
    if ( !themeEngine )
        return false;

    wxUxThemeHandle theme(this, L"BUTTON");
    if ( !theme )
        return false;

    int state;
    switch ( Get3StateValue() )
    {
        case wxCHK_CHECKED:
            state = CBS_CHECKEDNORMAL;
            break;

        case wxCHK_UNDETERMINED:
            state = CBS_MIXEDNORMAL;
            break;

        default:
            wxFAIL_MSG( _T("unexpected Get3StateValue() return value") );
            // fall through

        case wxCHK_UNCHECKED:
            state = CBS_UNCHECKEDNORMAL;
            break;
    }

    if ( !IsEnabled() )
        state += CBS_DISABLED_OFFSET;
    else if ( m_isPressed )
        state += CBS_PRESSED_OFFSET;
    else if ( m_isHot )
        state += CBS_HOT_OFFSET;

    HRESULT hr = themeEngine->DrawThemeBackground
                              (
                                theme,
                                hdc,
                                BP_CHECKBOX,
                                state,
                                &rectCheck,
                                NULL
                              );
    if ( FAILED(hr) )
    {
        wxLogApiError(_T("DrawThemeBackground(BP_CHECKBOX)"), hr);
    }
#endif // 0/1

    // draw the text
    const wxString& label = GetLabel();

    // first we need to measure it
    UINT fmt = DT_NOCLIP;

    // drawing underlying doesn't look well with focus rect (and the native
    // control doesn't do it)
    if ( isFocused )
        fmt |= DT_HIDEPREFIX;
    if ( isRightAligned )
        fmt |= DT_RIGHT;
    // TODO: also use DT_HIDEPREFIX if the system is configured so

    // we need to get the label real size first if we have to draw a focus rect
    // around it
    if ( isFocused )
    {
        if ( !::DrawText(hdc, label, label.length(), &rectLabel,
                         fmt | DT_CALCRECT) )
        {
            wxLogLastError(_T("DrawText(DT_CALCRECT)"));
        }
    }

    if ( !IsEnabled() )
    {
        ::SetTextColor(hdc, ::GetSysColor(COLOR_GRAYTEXT));
    }

    if ( !::DrawText(hdc, label, label.length(), &rectLabel, fmt) )
    {
        wxLogLastError(_T("DrawText()"));
    }

    // finally draw the focus
    if ( isFocused )
    {
        rectLabel.left--;
        rectLabel.right++;
        if ( !::DrawFocusRect(hdc, &rectLabel) )
        {
            wxLogLastError(_T("DrawFocusRect()"));
        }
    }

    return true;
}

#endif // wxUSE_CHECKBOX