sizer.cpp

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        {
            wxSize size( item->GetMinSizeWithBorder() );

            if (m_orient == wxVERTICAL)
            {
                wxCoord height = size.y;
                if (item->GetProportion())
                {
                    // Because of at least one visible item has non-zero
                    // proportion then m_stretchable is not zero
                    height = (delta * item->GetProportion()) / m_stretchable;
                }

                wxPoint child_pos( pt );
                wxSize  child_size( size.x, height );

                if (item->GetFlag() & (wxEXPAND | wxSHAPED))
                    child_size.x = m_size.x;
                else if (item->GetFlag() & wxALIGN_RIGHT)
                    child_pos.x += m_size.x - size.x;
                else if (item->GetFlag() & (wxCENTER | wxALIGN_CENTER_HORIZONTAL))
                // XXX wxCENTER is added for backward compatibility;
                //     wxALIGN_CENTER should be used in new code
                    child_pos.x += (m_size.x - size.x) / 2;

                item->SetDimension( child_pos, child_size );

                pt.y += height;
            }
            else
            {
                wxCoord width = size.x;
                if (item->GetProportion())
                {
                    // Because of at least one visible item has non-zero
                    // proportion then m_stretchable is not zero
                    width = (delta * item->GetProportion()) / m_stretchable;
                }

                wxPoint child_pos( pt );
                wxSize  child_size( width, size.y );

                if (item->GetFlag() & (wxEXPAND | wxSHAPED))
                    child_size.y = m_size.y;
                else if (item->GetFlag() & wxALIGN_BOTTOM)
                    child_pos.y += m_size.y - size.y;
                else if (item->GetFlag() & (wxCENTER | wxALIGN_CENTER_VERTICAL))
                // XXX wxCENTER is added for backward compatibility;
                //     wxALIGN_CENTER should be used in new code
                    child_pos.y += (m_size.y - size.y) / 2;

                item->SetDimension( child_pos, child_size );

                pt.x += width;
            }
        }

        node = node->GetNext();
    }
}

wxSize wxBoxSizer::CalcMin()
{
    if (m_children.GetCount() == 0)
        return wxSize(10,10);

    m_stretchable = 0;
    m_minWidth = 0;
    m_minHeight = 0;
    m_fixedWidth = 0;
    m_fixedHeight = 0;

    // precalc item minsizes and count proportions
    wxSizerItemList::compatibility_iterator node = m_children.GetFirst();
    while (node)
    {
        wxSizerItem *item = node->GetData();

        if ( item->IsShown() )
        {
            item->CalcMin();  // result is stored in the item

            m_stretchable += item->GetProportion();
        }

        node = node->GetNext();
    }

    // Total minimum size (width or height) of sizer
    int maxMinSize = 0;

    node = m_children.GetFirst();
    while (node)
    {
        wxSizerItem *item = node->GetData();

        if (item->IsShown() && item->GetProportion() != 0)
        {
            int stretch = item->GetProportion();
            wxSize size( item->GetMinSizeWithBorder() );
            int minSize;

            // Integer division rounded up is (a + b - 1) / b
            // Round up needed in order to guarantee that all
            // all items will have size not less then their min size
            if (m_orient == wxHORIZONTAL)
                minSize = ( size.x*m_stretchable + stretch - 1)/stretch;
            else
                minSize = ( size.y*m_stretchable + stretch - 1)/stretch;

            if (minSize > maxMinSize)
                maxMinSize = minSize;
        }
        node = node->GetNext();
    }

    // Calculate overall minimum size
    node = m_children.GetFirst();
    while (node)
    {
        wxSizerItem *item = node->GetData();

        if (item->IsShown())
        {
            wxSize size( item->GetMinSizeWithBorder() );
            if (item->GetProportion() != 0)
            {
                if (m_orient == wxHORIZONTAL)
                    size.x = (maxMinSize*item->GetProportion())/m_stretchable;
                else
                    size.y = (maxMinSize*item->GetProportion())/m_stretchable;
            }
            else
            {
                if (m_orient == wxVERTICAL)
                {
                    m_fixedHeight += size.y;
                    m_fixedWidth = wxMax( m_fixedWidth, size.x );
                }
                else
                {
                    m_fixedWidth += size.x;
                    m_fixedHeight = wxMax( m_fixedHeight, size.y );
                }
            }

            if (m_orient == wxHORIZONTAL)
            {
                m_minWidth += size.x;
                m_minHeight = wxMax( m_minHeight, size.y );
            }
            else
            {
                m_minHeight += size.y;
                m_minWidth = wxMax( m_minWidth, size.x );
            }
        }
        node = node->GetNext();
    }

    return wxSize( m_minWidth, m_minHeight );
}

//---------------------------------------------------------------------------
// wxStaticBoxSizer
//---------------------------------------------------------------------------

#if wxUSE_STATBOX

wxStaticBoxSizer::wxStaticBoxSizer( wxStaticBox *box, int orient )
    : wxBoxSizer( orient )
    , m_staticBox( box )
{
    wxASSERT_MSG( box, wxT("wxStaticBoxSizer needs a static box") );
}

wxStaticBoxSizer::wxStaticBoxSizer(int orient, wxWindow *win, const wxString& s)
                : wxBoxSizer(orient),
                  m_staticBox(new wxStaticBox(win, wxID_ANY, s))
{
}

static void GetStaticBoxBorders( wxStaticBox *box,
                                 int *borderTop,
                                 int *borderOther)
{
    // this has to be done platform by platform as there is no way to
    // guess the thickness of a wxStaticBox border
    box->GetBordersForSizer(borderTop, borderOther);
}

void wxStaticBoxSizer::RecalcSizes()
{
    int top_border, other_border;
    GetStaticBoxBorders(m_staticBox, &top_border, &other_border);

    m_staticBox->SetSize( m_position.x, m_position.y, m_size.x, m_size.y );

    wxPoint old_pos( m_position );
    m_position.x += other_border;
    m_position.y += top_border;
    wxSize old_size( m_size );
    m_size.x -= 2*other_border;
    m_size.y -= top_border + other_border;

    wxBoxSizer::RecalcSizes();

    m_position = old_pos;
    m_size = old_size;
}

wxSize wxStaticBoxSizer::CalcMin()
{
    int top_border, other_border;
    GetStaticBoxBorders(m_staticBox, &top_border, &other_border);

    wxSize ret( wxBoxSizer::CalcMin() );
    ret.x += 2*other_border;
    ret.y += other_border + top_border;

    return ret;
}

void wxStaticBoxSizer::ShowItems( bool show )
{
    m_staticBox->Show( show );
    wxBoxSizer::ShowItems( show );
}

#endif // wxUSE_STATBOX

#if wxUSE_BUTTON

wxStdDialogButtonSizer::wxStdDialogButtonSizer()
    : wxBoxSizer(wxHORIZONTAL)
{
    // Vertical buttons with lots of space on either side
    // looks rubbish on WinCE, so let's not do this for now.
    // If we are going to use vertical buttons, we should
    // put the sizer to the right of other controls in the dialog,
    // and that's beyond the scope of this sizer.
    // 
    // It also looks rubbish on GPE and other standard GTK
    // dialogs also just use normal buttons side by side
    // under GPE
#if 0
    bool is_pda = (wxSystemSettings::GetScreenType() <= wxSYS_SCREEN_PDA);
    // If we have a PDA screen, put yes/no button over
    // all other buttons, otherwise on the left side.
    if (is_pda)
        m_orient = wxVERTICAL;
#endif

    m_buttonAffirmative = NULL;
    m_buttonApply = NULL;
    m_buttonNegative = NULL;
    m_buttonCancel = NULL;
    m_buttonHelp = NULL;
}

void wxStdDialogButtonSizer::AddButton(wxButton *mybutton)
{
    switch (mybutton->GetId())
    {
        case wxID_OK:
        case wxID_YES:
        case wxID_SAVE:
            m_buttonAffirmative = mybutton;
            break;
        case wxID_APPLY:
            m_buttonApply = mybutton;
            break;
        case wxID_NO:
            m_buttonNegative = mybutton;
            break;
        case wxID_CANCEL:
            m_buttonCancel = mybutton;
            break;
        case wxID_HELP:
        case wxID_CONTEXT_HELP:
            m_buttonHelp = mybutton;
            break;
        default:
            break;
    }
}

void wxStdDialogButtonSizer::SetAffirmativeButton( wxButton *button )
{
    m_buttonAffirmative = button;
}

void wxStdDialogButtonSizer::SetNegativeButton( wxButton *button )
{
    m_buttonNegative = button;
}

void wxStdDialogButtonSizer::SetCancelButton( wxButton *button )
{
    m_buttonCancel = button;
}

void wxStdDialogButtonSizer::Realize()
{
#ifdef __WXMAC__
        Add(0, 0, 0, wxLEFT, 6);
        if (m_buttonHelp)
            Add((wxWindow*)m_buttonHelp, 0, wxALIGN_CENTRE | wxLEFT | wxRIGHT, 6);

        if (m_buttonNegative){
            // HIG POLICE BULLETIN - destructive buttons need extra padding
            // 24 pixels on either side
            Add((wxWindow*)m_buttonNegative, 0, wxALIGN_CENTRE | wxLEFT | wxRIGHT, 12);
        }

        // extra whitespace between help/negative and cancel/ok buttons
        Add(0, 0, 1, wxEXPAND, 0);

        if (m_buttonCancel){
            Add((wxWindow*)m_buttonCancel, 0, wxALIGN_CENTRE | wxLEFT | wxRIGHT, 6);
            // Cancel or help should be default
            // m_buttonCancel->SetDefaultButton();
        }

        // Ugh, Mac doesn't really have apply dialogs, so I'll just
        // figure the best place is between Cancel and OK
        if (m_buttonApply)
            Add((wxWindow*)m_buttonApply, 0, wxALIGN_CENTRE | wxLEFT | wxRIGHT, 6);

        if (m_buttonAffirmative){
            Add((wxWindow*)m_buttonAffirmative, 0, wxALIGN_CENTRE | wxLEFT, 6);

            if (m_buttonAffirmative->GetId() == wxID_SAVE){
                // these buttons have set labels under Mac so we should use them
                m_buttonAffirmative->SetLabel(_("Save"));
                m_buttonNegative->SetLabel(_("Don't Save"));
            }
        }

        // Extra space around and at the right
        Add(12, 24);
#elif defined(__WXGTK20__)
        bool is_pda = (wxSystemSettings::GetScreenType() <= wxSYS_SCREEN_PDA);
    
        int space_step = 3;
        if (is_pda) space_step = 0;
    
        Add(0, 0, 0, wxLEFT, 9);
        if (m_buttonHelp)
            Add((wxWindow*)m_buttonHelp, 0, wxALIGN_CENTRE | wxLEFT | wxRIGHT, space_step);

        // extra whitespace between help and cancel/ok buttons
        Add(0, 0, 1, wxEXPAND, 0);

        if (m_buttonNegative){
            Add((wxWindow*)m_buttonNegative, 0, wxALIGN_CENTRE | wxLEFT | wxRIGHT, space_step);
        }

        if (m_buttonCancel){
            Add((wxWindow*)m_buttonCancel, 0, wxALIGN_CENTRE | wxLEFT | wxRIGHT, space_step);
            // Cancel or help should be default
            // m_buttonCancel->SetDefaultButton();
        }

        if (m_buttonApply)
            Add((wxWindow*)m_buttonApply, 0, wxALIGN_CENTRE | wxLEFT | wxRIGHT, space_step);

        if (m_buttonAffirmative)
            Add((wxWindow*)m_buttonAffirmative, 0, wxALIGN_CENTRE | wxLEFT, 2*space_step);
#elif defined(__WXMSW__)
        // Windows

        // right-justify buttons
        Add(0, 0, 1, wxEXPAND, 0);

        if (m_buttonAffirmative){
            Add((wxWindow*)m_buttonAffirmative, 0, wxALIGN_CENTRE | wxLEFT | wxRIGHT, m_buttonAffirmative->ConvertDialogToPixels(wxSize(2, 0)).x);
        }

        if (m_buttonNegative){
            Add((wxWindow*)m_buttonNegative, 0, wxALIGN_CENTRE | wxLEFT | wxRIGHT, m_buttonNegative->ConvertDialogToPixels(wxSize(2, 0)).x);
        }

        if (m_buttonCancel){
            Add((wxWindow*)m_buttonCancel, 0, wxALIGN_CENTRE | wxLEFT | wxRIGHT, m_buttonCancel->ConvertDialogToPixels(wxSize(2, 0)).x);
        }
        if (m_buttonApply)
            Add((wxWindow*)m_buttonApply, 0, wxALIGN_CENTRE | wxLEFT | wxRIGHT, m_buttonApply->ConvertDialogToPixels(wxSize(2, 0)).x);

        if (m_buttonHelp)
            Add((wxWindow*)m_buttonHelp, 0, wxALIGN_CENTRE | wxLEFT | wxRIGHT, m_buttonHelp->ConvertDialogToPixels(wxSize(2, 0)).x);
#else
        // GTK+1 and any other platform

        // Add(0, 0, 0, wxLEFT, 5); // Not sure what this was for but it unbalances the dialog
        if (m_buttonHelp)
            Add((wxWindow*)m_buttonHelp, 0, wxALIGN_CENTRE | wxLEFT | wxRIGHT, m_buttonHelp->ConvertDialogToPixels(wxSize(4, 0)).x);

        // extra whitespace between help and cancel/ok buttons
        Add(0, 0, 1, wxEXPAND, 0);

        if (m_buttonApply)
            Add((wxWindow*)m_buttonApply, 0, wxALIGN_CENTRE | wxLEFT | wxRIGHT, m_buttonApply->ConvertDialogToPixels(wxSize(4, 0)).x);

        if (m_buttonAffirmative){
            Add((wxWindow*)m_buttonAffirmative, 0, wxALIGN_CENTRE | wxLEFT | wxRIGHT, m_buttonAffirmative->ConvertDialogToPixels(wxSize(4, 0)).x);
        }

        if (m_buttonNegative){
            Add((wxWindow*)m_buttonNegative, 0, wxALIGN_CENTRE | wxLEFT | wxRIGHT, m_buttonNegative->ConvertDialogToPixels(wxSize(4, 0)).x);
        }

        if (m_buttonCancel){
            Add((wxWindow*)m_buttonCancel, 0, wxALIGN_CENTRE | wxLEFT | wxRIGHT, m_buttonCancel->ConvertDialogToPixels(wxSize(4, 0)).x);
            // Cancel or help should be default
            // m_buttonCancel->SetDefaultButton();
        }

#endif
}

#endif // wxUSE_BUTTON

#if WXWIN_COMPATIBILITY_2_4

// ----------------------------------------------------------------------------
// wxNotebookSizer
// ----------------------------------------------------------------------------

#if wxUSE_BOOKCTRL
IMPLEMENT_CLASS(wxBookCtrlSizer, wxSizer)
#if wxUSE_NOTEBOOK
IMPLEMENT_CLASS(wxNotebookSizer, wxBookCtrlSizer)
#endif // wxUSE_NOTEBOOK
#endif // wxUSE_BOOKCTRL

#if wxUSE_BOOKCTRL

wxBookCtrlSizer::wxBookCtrlSizer(wxBookCtrlBase *bookctrl)
               : m_bookctrl(bookctrl)
{
    wxASSERT_MSG( bookctrl, wxT("wxBookCtrlSizer needs a control") );
}

void wxBookCtrlSizer::RecalcSizes()
{
    m_bookctrl->SetSize( m_position.x, m_position.y, m_size.x, m_size.y );
}

wxSize wxBookCtrlSizer::CalcMin()
{
    wxSize sizeBorder = m_bookctrl->CalcSizeFromPage(wxSize(0,0));

    sizeBorder.x += 5;
    sizeBorder.y += 5;

    if ( m_bookctrl->GetPageCount() == 0 )
    {
        return wxSize(sizeBorder.x + 10, sizeBorder.y + 10);
    }

    int maxX = 0;
    int maxY = 0;

    wxWindowList::compatibility_iterator
        node = m_bookctrl->GetChildren().GetFirst();
    while (node)
    {
        wxWindow *item = node->GetData();
        wxSizer *itemsizer = item->GetSizer();

        if (itemsizer)
        {
            wxSize subsize( itemsizer->CalcMin() );

            if (subsize.x > maxX)
                maxX = subsize.x;
            if (subsize.y > maxY)
                maxY = subsize.y;
        }

        node = node->GetNext();
    }

    return wxSize( maxX, maxY ) + sizeBorder;
}

#if wxUSE_NOTEBOOK

wxNotebookSizer::wxNotebookSizer(wxNotebook *nb)
{
    wxASSERT_MSG( nb, wxT("wxNotebookSizer needs a control") );
    m_bookctrl = nb;
}

#endif // wxUSE_NOTEBOOOK
#endif // wxUSE_BOOKCTRL

#endif // WXWIN_COMPATIBILITY_2_4