sizer.cpp

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

        if (item->GetWindow() == window)
        {
            return item->IsShown();
        }
        node = node->GetNext();
    }

    wxFAIL_MSG( _T("IsShown failed to find sizer item") );

    return false;
}

bool wxSizer::IsShown( wxSizer *sizer ) const
{
    wxSizerItemList::compatibility_iterator node = m_children.GetFirst();
    while (node)
    {
        wxSizerItem     *item = node->GetData();

        if (item->GetSizer() == sizer)
        {
            return item->IsShown();
        }
        node = node->GetNext();
    }

    wxFAIL_MSG( _T("IsShown failed to find sizer item") );

    return false;
}

bool wxSizer::IsShown( size_t index ) const
{
    wxCHECK_MSG( index < m_children.GetCount(),
                 false,
                 _T("IsShown index is out of range") );

    return m_children.Item( index )->GetData()->IsShown();
}


//---------------------------------------------------------------------------
// wxGridSizer
//---------------------------------------------------------------------------

wxGridSizer::wxGridSizer( int rows, int cols, int vgap, int hgap )
    : m_rows( ( cols == 0 && rows == 0 ) ? 1 : rows )
    , m_cols( cols )
    , m_vgap( vgap )
    , m_hgap( hgap )
{
}

wxGridSizer::wxGridSizer( int cols, int vgap, int hgap )
    : m_rows( cols == 0 ? 1 : 0 )
    , m_cols( cols )
    , m_vgap( vgap )
    , m_hgap( hgap )
{
}

int wxGridSizer::CalcRowsCols(int& nrows, int& ncols) const
{
    int nitems = m_children.GetCount();
    if ( nitems)
    {
        if ( m_cols )
        {
            ncols = m_cols;
            nrows = (nitems + m_cols - 1) / m_cols;
        }
        else if ( m_rows )
        {
            ncols = (nitems + m_rows - 1) / m_rows;
            nrows = m_rows;
        }
        else // 0 columns, 0 rows?
        {
            wxFAIL_MSG( _T("grid sizer must have either rows or columns fixed") );

            nrows = ncols = 0;
        }
    }

    return nitems;
}

void wxGridSizer::RecalcSizes()
{
    int nitems, nrows, ncols;
    if ( (nitems = CalcRowsCols(nrows, ncols)) == 0 )
        return;

    wxSize sz( GetSize() );
    wxPoint pt( GetPosition() );

    int w = (sz.x - (ncols - 1) * m_hgap) / ncols;
    int h = (sz.y - (nrows - 1) * m_vgap) / nrows;

    int x = pt.x;
    for (int c = 0; c < ncols; c++)
    {
        int y = pt.y;
        for (int r = 0; r < nrows; r++)
        {
            int i = r * ncols + c;
            if (i < nitems)
            {
                wxSizerItemList::compatibility_iterator node = m_children.Item( i );

                wxASSERT_MSG( node, _T("Failed to find SizerItemList node") );

                SetItemBounds( node->GetData(), x, y, w, h);
            }
            y = y + h + m_vgap;
        }
        x = x + w + m_hgap;
    }
}

wxSize wxGridSizer::CalcMin()
{
    int nrows, ncols;
    if ( CalcRowsCols(nrows, ncols) == 0 )
        return wxSize(10, 10);

    // Find the max width and height for any component
    int w = 0;
    int h = 0;

    wxSizerItemList::compatibility_iterator node = m_children.GetFirst();
    while (node)
    {
        wxSizerItem     *item = node->GetData();
        wxSize           sz( item->CalcMin() );

        w = wxMax( w, sz.x );
        h = wxMax( h, sz.y );

        node = node->GetNext();
    }

    return wxSize( ncols * w + (ncols-1) * m_hgap,
                   nrows * h + (nrows-1) * m_vgap );
}

void wxGridSizer::SetItemBounds( wxSizerItem *item, int x, int y, int w, int h )
{
    wxPoint pt( x,y );
    wxSize sz( item->GetMinSizeWithBorder() );
    int flag = item->GetFlag();

    if ((flag & wxEXPAND) || (flag & wxSHAPED))
    {
       sz = wxSize(w, h);
    }
    else
    {
        if (flag & wxALIGN_CENTER_HORIZONTAL)
        {
            pt.x = x + (w - sz.x) / 2;
        }
        else if (flag & wxALIGN_RIGHT)
        {
            pt.x = x + (w - sz.x);
        }

        if (flag & wxALIGN_CENTER_VERTICAL)
        {
            pt.y = y + (h - sz.y) / 2;
        }
        else if (flag & wxALIGN_BOTTOM)
        {
            pt.y = y + (h - sz.y);
        }
    }

    item->SetDimension(pt, sz);
}

//---------------------------------------------------------------------------
// wxFlexGridSizer
//---------------------------------------------------------------------------

wxFlexGridSizer::wxFlexGridSizer( int rows, int cols, int vgap, int hgap )
               : wxGridSizer( rows, cols, vgap, hgap ),
                 m_flexDirection(wxBOTH),
                 m_growMode(wxFLEX_GROWMODE_SPECIFIED)
{
}

wxFlexGridSizer::wxFlexGridSizer( int cols, int vgap, int hgap )
               : wxGridSizer( cols, vgap, hgap ),
                 m_flexDirection(wxBOTH),
                 m_growMode(wxFLEX_GROWMODE_SPECIFIED)
{
}

wxFlexGridSizer::~wxFlexGridSizer()
{
}

void wxFlexGridSizer::RecalcSizes()
{
    int nitems, nrows, ncols;
    if ( (nitems = CalcRowsCols(nrows, ncols)) == 0 )
        return;

    wxPoint pt( GetPosition() );
    wxSize sz( GetSize() );

    AdjustForGrowables(sz, m_calculatedMinSize, nrows, ncols);

    sz = wxSize( pt.x + sz.x, pt.y + sz.y );

    int x = pt.x;
    for (int c = 0; c < ncols; c++)
    {
        int y = pt.y;
        for (int r = 0; r < nrows; r++)
        {
            int i = r * ncols + c;
            if (i < nitems)
            {
                wxSizerItemList::compatibility_iterator node = m_children.Item( i );

                wxASSERT_MSG( node, _T("Failed to find node") );

                int w = wxMax( 0, wxMin( m_colWidths[c], sz.x - x ) );
                int h = wxMax( 0, wxMin( m_rowHeights[r], sz.y - y ) );

                SetItemBounds( node->GetData(), x, y, w, h);
            }
            if (m_rowHeights[r] != -1)
                y = y + m_rowHeights[r] + m_vgap;
        }
        if (m_colWidths[c] != -1)
            x = x + m_colWidths[c] + m_hgap;
    }
}

wxSize wxFlexGridSizer::CalcMin()
{
    int     nrows,
            ncols;
    size_t  i, s;

    // Number of rows/columns can change as items are added or removed.
    if ( !CalcRowsCols(nrows, ncols) )
        return wxSize(10, 10);

    m_rowHeights.SetCount(nrows);
    m_colWidths.SetCount(ncols);

    // We have to recalcuate the sizes in case the item minimum size has
    // changed since the previous layout, or the item has been hidden using
    // wxSizer::Show(). If all the items in a row/column are hidden, the final
    // dimension of the row/column will be -1, indicating that the column
    // itself is hidden.
    for( s = m_rowHeights.GetCount(), i = 0; i < s; ++i )
        m_rowHeights[ i ] = -1;
    for( s = m_colWidths.GetCount(), i = 0; i < s; ++i )
        m_colWidths[ i ] = -1;

    wxSizerItemList::compatibility_iterator node = m_children.GetFirst();

    i = 0;
    while (node)
    {
        wxSizerItem    *item = node->GetData();
        if ( item->IsShown() )
        {
            wxSize sz( item->CalcMin() );
            int row = i / ncols;
            int col = i % ncols;

            m_rowHeights[ row ] = wxMax( wxMax( 0, sz.y ), m_rowHeights[ row ] );
            m_colWidths[ col ] = wxMax( wxMax( 0, sz.x ), m_colWidths[ col ] );
        }

        node = node->GetNext();
        i++;
    }

    AdjustForFlexDirection();

    // Sum total minimum size, including gaps between rows/columns.
    // -1 is used as a magic number meaning empty column.
    int width = 0;
    for (int col = 0; col < ncols; col++)
        if ( m_colWidths[ col ] != -1 )
            width += m_colWidths[ col ] + m_hgap;
    if (width > 0)
        width -= m_hgap;

    int height = 0;
    for (int row = 0; row < nrows; row++)
        if ( m_rowHeights[ row ] != -1 )
            height += m_rowHeights[ row ] + m_vgap;
    if (height > 0)
        height -= m_vgap;

    m_calculatedMinSize = wxSize( width, height );
    return m_calculatedMinSize;
}

void wxFlexGridSizer::AdjustForFlexDirection()
{
    // the logic in CalcMin works when we resize flexibly in both directions
    // but maybe this is not the case
    if ( m_flexDirection != wxBOTH )
    {
        // select the array corresponding to the direction in which we do *not*
        // resize flexibly
        wxArrayInt& array = m_flexDirection == wxVERTICAL ? m_colWidths
                                                          : m_rowHeights;

        const size_t count = array.GetCount();

        // find the largest value in this array
        size_t n;
        int largest = 0;

        for ( n = 0; n < count; ++n )
        {
            if ( array[n] > largest )
                largest = array[n];
        }

        // and now fill it with the largest value
        for ( n = 0; n < count; ++n )
        {
            array[n] = largest;
        }
    }
}


void wxFlexGridSizer::AdjustForGrowables(const wxSize& sz, const wxSize& minsz,
                                         int nrows, int ncols)
{
    // what to do with the rows? by default, resize them proportionally
    if ( sz.y > minsz.y && ( (m_flexDirection & wxVERTICAL) || (m_growMode == wxFLEX_GROWMODE_SPECIFIED) ) )
    {
        int sum_proportions = 0;
        int growable_space = 0;
        int num = 0;
        size_t idx;
        for (idx = 0; idx < m_growableRows.GetCount(); idx++)
        {
            // Since the number of rows/columns can change as items are
            // inserted/deleted, we need to verify at runtime that the
            // requested growable rows/columns are still valid.
            if (m_growableRows[idx] >= nrows)
                continue;

            // If all items in a row/column are hidden, that row/column will
            // have a dimension of -1.  This causes the row/column to be
            // hidden completely.
            if (m_rowHeights[ m_growableRows[idx] ] == -1)
                continue;
            sum_proportions += m_growableRowsProportions[idx];
            growable_space += m_rowHeights[ m_growableRows[idx] ];
            num++;
        }

        if (num > 0)
        {
            for (idx = 0; idx < m_growableRows.GetCount(); idx++)
            {
                if (m_growableRows[idx] >= nrows )
                    continue;
                if (m_rowHeights[ m_growableRows[idx] ] == -1)
                    m_rowHeights[ m_growableRows[idx] ] = 0;
                else
                {
                    int delta = (sz.y - minsz.y);
                    if (sum_proportions == 0)
                        delta = (delta/num) + m_rowHeights[ m_growableRows[idx] ];
                    else
                        delta = ((delta+growable_space)*m_growableRowsProportions[idx]) / sum_proportions;
                    m_rowHeights[ m_growableRows[idx] ] = delta;
                }
            }
        }
    }
    else if ( (m_growMode == wxFLEX_GROWMODE_ALL) && (sz.y > minsz.y) )
    {
        // rounding problem?
        for ( int row = 0; row < nrows; ++row )
            m_rowHeights[ row ] = sz.y / nrows;
    }

    // the same logic as above but for the columns
    if ( sz.x > minsz.x && ( (m_flexDirection & wxHORIZONTAL) || (m_growMode == wxFLEX_GROWMODE_SPECIFIED) ) )
    {
        int sum_proportions = 0;
        int growable_space = 0;
        int num = 0;
        size_t idx;
        for (idx = 0; idx < m_growableCols.GetCount(); idx++)
        {
            // Since the number of rows/columns can change as items are
            // inserted/deleted, we need to verify at runtime that the
            // requested growable rows/columns are still valid.
            if (m_growableCols[idx] >= ncols)
                continue;

            // If all items in a row/column are hidden, that row/column will
            // have a dimension of -1.  This causes the column to be hidden
            // completely.
            if (m_colWidths[ m_growableCols[idx] ] == -1)
                continue;
            sum_proportions += m_growableColsProportions[idx];
            growable_space += m_colWidths[ m_growableCols[idx] ];
            num++;
        }

        if (num > 0)
        {
            for (idx = 0; idx < m_growableCols.GetCount(); idx++)
            {
                if (m_growableCols[idx] >= ncols )
                    continue;
                if (m_colWidths[ m_growableCols[idx] ] == -1)
                    m_colWidths[ m_growableCols[idx] ] = 0;
                else
                {
                    int delta = (sz.x - minsz.x);
                    if (sum_proportions == 0)
                        delta = (delta/num) + m_colWidths[ m_growableCols[idx] ];
                    else
                        delta = ((delta+growable_space)*m_growableColsProportions[idx])/sum_proportions;
                    m_colWidths[ m_growableCols[idx] ] = delta;
                }
            }
        }
    }
    else if ( (m_growMode == wxFLEX_GROWMODE_ALL) && (sz.x > minsz.x) )
    {
        for ( int col=0; col < ncols; ++col )
            m_colWidths[ col ] = sz.x / ncols;
    }
}


void wxFlexGridSizer::AddGrowableRow( size_t idx, int proportion )
{
    m_growableRows.Add( idx );
    m_growableRowsProportions.Add( proportion );
}

void wxFlexGridSizer::RemoveGrowableRow( size_t idx )
{
    m_growableRows.Remove( idx );
}

void wxFlexGridSizer::AddGrowableCol( size_t idx, int proportion )
{
    m_growableCols.Add( idx );
    m_growableColsProportions.Add( proportion );
}

void wxFlexGridSizer::RemoveGrowableCol( size_t idx )
{
    m_growableCols.Remove( idx );
}

//---------------------------------------------------------------------------
// wxBoxSizer
//---------------------------------------------------------------------------

wxBoxSizer::wxBoxSizer( int orient )
    : m_orient( orient )
{
}

void wxBoxSizer::RecalcSizes()
{
    if (m_children.GetCount() == 0)
        return;

    int delta = 0;
    if (m_stretchable)
    {
        if (m_orient == wxHORIZONTAL)
            delta = m_size.x - m_fixedWidth;
        else
            delta = m_size.y - m_fixedHeight;
    }

    wxPoint pt( m_position );

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

        if (item->IsShown())