[wxWidgets.git] / src / generic / calctrl.cpp

///////////////////////////////////////////////////////////////////////////////
// Name:        generic/calctrl.cpp
// Purpose:     implementation fo the generic wxCalendarCtrl
// Author:      Vadim Zeitlin
// Modified by:
// Created:     29.12.99
// RCS-ID:      $Id$
// Copyright:   (c) 1999 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
// Licence:     wxWindows license
///////////////////////////////////////////////////////////////////////////////

// ============================================================================
// declarations
// ============================================================================

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------

#ifdef __GNUG__
    #pragma implementation "calctrl.h"
#endif

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
    #pragma hdrstop
#endif

#ifndef WX_PRECOMP
    #include "wx/dcclient.h"
    #include "wx/settings.h"
    #include "wx/brush.h"
    #include "wx/combobox.h"
    #include "wx/stattext.h"
#endif //WX_PRECOMP

#if wxUSE_CALENDARCTRL

#include "wx/calctrl.h"

#define DEBUG_PAINT 0

// ----------------------------------------------------------------------------
// private classes
// ----------------------------------------------------------------------------

class wxMonthComboBox : public wxComboBox
{
public:
    wxMonthComboBox(wxCalendarCtrl *cal);

    void OnMonthChange(wxCommandEvent& event) { m_cal->OnMonthChange(event); }

private:
    wxCalendarCtrl *m_cal;

    DECLARE_EVENT_TABLE()
};

class wxYearSpinCtrl : public wxSpinCtrl
{
public:
    wxYearSpinCtrl(wxCalendarCtrl *cal);

    void OnYearChange(wxSpinEvent& event) { m_cal->OnYearChange(event); }

private:
    wxCalendarCtrl *m_cal;

    DECLARE_EVENT_TABLE()
};

// ----------------------------------------------------------------------------
// wxWin macros
// ----------------------------------------------------------------------------

BEGIN_EVENT_TABLE(wxCalendarCtrl, wxControl)
    EVT_PAINT(wxCalendarCtrl::OnPaint)

    EVT_CHAR(wxCalendarCtrl::OnChar)

    EVT_LEFT_DOWN(wxCalendarCtrl::OnClick)
    EVT_LEFT_DCLICK(wxCalendarCtrl::OnDClick)
END_EVENT_TABLE()

BEGIN_EVENT_TABLE(wxMonthComboBox, wxComboBox)
    EVT_COMBOBOX(-1, wxMonthComboBox::OnMonthChange)
END_EVENT_TABLE()

BEGIN_EVENT_TABLE(wxYearSpinCtrl, wxSpinCtrl)
    EVT_SPINCTRL(-1, wxYearSpinCtrl::OnYearChange)
END_EVENT_TABLE()

IMPLEMENT_DYNAMIC_CLASS(wxCalendarCtrl, wxControl)
IMPLEMENT_DYNAMIC_CLASS(wxCalendarEvent, wxCommandEvent)

// ----------------------------------------------------------------------------
// events
// ----------------------------------------------------------------------------

DEFINE_EVENT_TYPE(wxEVT_CALENDAR_SEL_CHANGED)
DEFINE_EVENT_TYPE(wxEVT_CALENDAR_DAY_CHANGED)
DEFINE_EVENT_TYPE(wxEVT_CALENDAR_MONTH_CHANGED)
DEFINE_EVENT_TYPE(wxEVT_CALENDAR_YEAR_CHANGED)
DEFINE_EVENT_TYPE(wxEVT_CALENDAR_DOUBLECLICKED)
DEFINE_EVENT_TYPE(wxEVT_CALENDAR_WEEKDAY_CLICKED)

// ============================================================================
// implementation
// ============================================================================

// ----------------------------------------------------------------------------
// wxMonthComboBox and wxYearSpinCtrl
// ----------------------------------------------------------------------------

wxMonthComboBox::wxMonthComboBox(wxCalendarCtrl *cal)
               : wxComboBox(cal->GetParent(), -1,
                            wxEmptyString,
                            wxDefaultPosition,
                            wxDefaultSize,
                            0, NULL,
                            wxCB_READONLY)
{
    m_cal = cal;

    wxDateTime::Month m;
    for ( m = wxDateTime::Jan; m < wxDateTime::Inv_Month; wxNextMonth(m) )
    {
        Append(wxDateTime::GetMonthName(m));
    }

    SetSelection(m_cal->GetDate().GetMonth());
    SetSize(-1, -1, -1, -1, wxSIZE_AUTO_WIDTH|wxSIZE_AUTO_HEIGHT);
}

wxYearSpinCtrl::wxYearSpinCtrl(wxCalendarCtrl *cal)
              : wxSpinCtrl(cal->GetParent(), -1,
                           cal->GetDate().Format(_T("%Y")),
                           wxDefaultPosition,
                           wxDefaultSize,
                           wxSP_ARROW_KEYS,
                           -4300, 10000, cal->GetDate().GetYear())
{
    m_cal = cal;
}

// ----------------------------------------------------------------------------
// wxCalendarCtrl
// ----------------------------------------------------------------------------

void wxCalendarCtrl::Init()
{
    m_comboMonth = NULL;
    m_spinYear = NULL;

    m_widthCol =
    m_heightRow = 0;

    wxDateTime::WeekDay wd;
    for ( wd = wxDateTime::Sun; wd < wxDateTime::Inv_WeekDay; wxNextWDay(wd) )
    {
        m_weekdays[wd] = wxDateTime::GetWeekDayName(wd, wxDateTime::Name_Abbr);
    }

    for ( size_t n = 0; n < WXSIZEOF(m_attrs); n++ )
    {
        m_attrs[n] = NULL;
    }

    wxSystemSettings ss;
    m_colHighlightFg = ss.GetSystemColour(wxSYS_COLOUR_HIGHLIGHTTEXT);
    m_colHighlightBg = ss.GetSystemColour(wxSYS_COLOUR_HIGHLIGHT);

    m_colHolidayFg = *wxRED;
    // don't set m_colHolidayBg - by default, same as our bg colour

    m_colHeaderFg = *wxBLUE;
    m_colHeaderBg = *wxLIGHT_GREY;
}

bool wxCalendarCtrl::Create(wxWindow *parent,
                            wxWindowID id,
                            const wxDateTime& date,
                            const wxPoint& pos,
                            const wxSize& size,
                            long style,
                            const wxString& name)
{
    if ( !wxControl::Create(parent, id, pos, size,
                            style | wxWANTS_CHARS, wxDefaultValidator, name) )
    {
        return FALSE;
    }

    // needed to get the arrow keys normally used for the dialog navigation
    SetWindowStyle(style | wxWANTS_CHARS);

    m_date = date.IsValid() ? date : wxDateTime::Today();

    m_lowdate = wxDefaultDateTime;
    m_highdate = wxDefaultDateTime;

    if ( !(GetWindowStyle() & wxCAL_SEQUENTIAL_MONTH_SELECTION) )
    {
        m_spinYear = new wxYearSpinCtrl(this);
        m_staticYear = new wxStaticText(GetParent(), -1, m_date.Format(_T("%Y")),
                                        wxDefaultPosition, wxDefaultSize,
                                        wxALIGN_CENTRE);

        m_comboMonth = new wxMonthComboBox(this);
        m_staticMonth = new wxStaticText(GetParent(), -1, m_date.Format(_T("%B")),
                                         wxDefaultPosition, wxDefaultSize,
                                         wxALIGN_CENTRE);
    }

    ShowCurrentControls();

    wxSize sizeReal;
    if ( size.x == -1 || size.y == -1 )
    {
        sizeReal = DoGetBestSize();
        if ( size.x != -1 )
            sizeReal.x = size.x;
        if ( size.y != -1 )
            sizeReal.y = size.y;
    }
    else
    {
        sizeReal = size;
    }

    SetSize(sizeReal);

    SetBackgroundColour(*wxWHITE);
    SetFont(*wxSWISS_FONT);

    SetHolidayAttrs();

    return TRUE;
}

wxCalendarCtrl::~wxCalendarCtrl()
{
    for ( size_t n = 0; n < WXSIZEOF(m_attrs); n++ )
    {
        delete m_attrs[n];
    }
}

// ----------------------------------------------------------------------------
// forward wxWin functions to subcontrols
// ----------------------------------------------------------------------------

bool wxCalendarCtrl::Show(bool show)
{
    if ( !wxControl::Show(show) )
    {
        return FALSE;
    }

    if ( !(GetWindowStyle() & wxCAL_SEQUENTIAL_MONTH_SELECTION) )
    {
        if ( GetMonthControl() )
        {
            GetMonthControl()->Show(show);
            GetYearControl()->Show(show);
        }
    }

    return TRUE;
}

bool wxCalendarCtrl::Enable(bool enable)
{
    if ( !wxControl::Enable(enable) )
    {
        return FALSE;
    }

    if ( !(GetWindowStyle() & wxCAL_SEQUENTIAL_MONTH_SELECTION) )
    {
        GetMonthControl()->Enable(enable);
        GetYearControl()->Enable(enable);
    }

    return TRUE;
}

// ----------------------------------------------------------------------------
// enable/disable month/year controls
// ----------------------------------------------------------------------------

void wxCalendarCtrl::ShowCurrentControls()
{
    if ( !(GetWindowStyle() & wxCAL_SEQUENTIAL_MONTH_SELECTION) )
    {
        if ( AllowMonthChange() )
        {
            m_comboMonth->Show();
            m_staticMonth->Hide();

            if ( AllowYearChange() )
            {
                m_spinYear->Show();
                m_staticYear->Hide();

                // skip the rest
                return;
            }
        }
        else
        {
            m_comboMonth->Hide();
            m_staticMonth->Show();
        }

        // year change not allowed here
        m_spinYear->Hide();
        m_staticYear->Show();
    }
}

wxControl *wxCalendarCtrl::GetMonthControl() const
{
    return AllowMonthChange() ? (wxControl *)m_comboMonth : (wxControl *)m_staticMonth;
}

wxControl *wxCalendarCtrl::GetYearControl() const
{
    return AllowYearChange() ? (wxControl *)m_spinYear : (wxControl *)m_staticYear;
}

void wxCalendarCtrl::EnableYearChange(bool enable)
{
    if ( enable != AllowYearChange() )
    {
        long style = GetWindowStyle();
        if ( enable )
            style &= ~wxCAL_NO_YEAR_CHANGE;
        else
            style |= wxCAL_NO_YEAR_CHANGE;
        SetWindowStyle(style);

        ShowCurrentControls();
        if ( GetWindowStyle() & wxCAL_SEQUENTIAL_MONTH_SELECTION )
        {
            Refresh();
        }
    }
}

void wxCalendarCtrl::EnableMonthChange(bool enable)
{
    if ( enable != AllowMonthChange() )
    {
        long style = GetWindowStyle();
        if ( enable )
            style &= ~wxCAL_NO_MONTH_CHANGE;
        else
            style |= wxCAL_NO_MONTH_CHANGE;
        SetWindowStyle(style);

        ShowCurrentControls();
        if ( GetWindowStyle() & wxCAL_SEQUENTIAL_MONTH_SELECTION )
        {
            Refresh();
        }
    }
}

// ----------------------------------------------------------------------------
// changing date
// ----------------------------------------------------------------------------

bool wxCalendarCtrl::SetDate(const wxDateTime& date)
{
    bool retval = FALSE;

    bool sameMonth = m_date.GetMonth() == date.GetMonth(),
         sameYear = m_date.GetYear() == date.GetYear();

    if ( IsDateInRange(date) )
    {
        if ( sameMonth && sameYear )
        {
            // just change the day
            retval = TRUE;
            ChangeDay(date);
        }
        else
        {
            if ( !AllowMonthChange() || (!AllowYearChange() && !sameYear) )
            {
                // forbidden
                return retval;
            }

            // change everything
            retval = TRUE;
            m_date = date;

            if ( !(GetWindowStyle() & wxCAL_SEQUENTIAL_MONTH_SELECTION) )
            {
                // update the controls
                m_comboMonth->SetSelection(m_date.GetMonth());

                if ( AllowYearChange() )
                {
                    m_spinYear->SetValue(m_date.Format(_T("%Y")));
                }
            }

            // as the month changed, holidays did too
            SetHolidayAttrs();

            // update the calendar
            Refresh();
        }
    }

    return retval;
}

void wxCalendarCtrl::ChangeDay(const wxDateTime& date)
{
    if ( m_date != date )
    {
        // we need to refresh the row containing the old date and the one
        // containing the new one
        wxDateTime dateOld = m_date;
        m_date = date;

        RefreshDate(dateOld);

        // if the date is in the same row, it was already drawn correctly
        if ( GetWeek(m_date) != GetWeek(dateOld) )
        {
            RefreshDate(m_date);
        }
    }
}

void wxCalendarCtrl::SetDateAndNotify(const wxDateTime& date)
{
    wxDateTime::Tm tm1 = m_date.GetTm(),
                   tm2 = date.GetTm();

    wxEventType type;
    if ( tm1.year != tm2.year )
        type = wxEVT_CALENDAR_YEAR_CHANGED;
    else if ( tm1.mon != tm2.mon )
        type = wxEVT_CALENDAR_MONTH_CHANGED;
    else if ( tm1.mday != tm2.mday )
        type = wxEVT_CALENDAR_DAY_CHANGED;
    else
        return;

    if ( SetDate(date) )
    {
        GenerateEvents(type, wxEVT_CALENDAR_SEL_CHANGED);
    }
}

// ----------------------------------------------------------------------------
// date range
// ----------------------------------------------------------------------------

bool wxCalendarCtrl::SetLowerDateLimit(const wxDateTime& date /* = wxDefaultDateTime */)
{
    bool retval = TRUE;

    if ( !(date.IsValid()) || ( ( m_highdate.IsValid() ) ? ( date <= m_highdate ) : TRUE ) )
    {
        m_lowdate = date;
    }
    else
    {
        retval = FALSE;
    }

    return retval;
}

bool wxCalendarCtrl::SetUpperDateLimit(const wxDateTime& date /* = wxDefaultDateTime */)
{
    bool retval = TRUE;

    if ( !(date.IsValid()) || ( ( m_lowdate.IsValid() ) ? ( date >= m_lowdate ) : TRUE ) )
    {
        m_highdate = date;
    }
    else
    {
        retval = FALSE;
    }

    return retval;
}

bool wxCalendarCtrl::SetDateRange(const wxDateTime& lowerdate /* = wxDefaultDateTime */, const wxDateTime& upperdate /* = wxDefaultDateTime */)
{
    bool retval = TRUE;

    if (
        ( !( lowerdate.IsValid() ) || ( ( upperdate.IsValid() ) ? ( lowerdate <= upperdate ) : TRUE ) ) &&
        ( !( upperdate.IsValid() ) || ( ( lowerdate.IsValid() ) ? ( upperdate >= lowerdate ) : TRUE ) ) )
    {
        m_lowdate = lowerdate;
        m_highdate = upperdate;
    }
    else
    {
        retval = FALSE;
    }

    return retval;
}

// ----------------------------------------------------------------------------
// date helpers
// ----------------------------------------------------------------------------

wxDateTime wxCalendarCtrl::GetStartDate() const
{
    wxDateTime::Tm tm = m_date.GetTm();

    wxDateTime date = wxDateTime(1, tm.mon, tm.year);

    // rewind back
    date.SetToPrevWeekDay(GetWindowStyle() & wxCAL_MONDAY_FIRST
                          ? wxDateTime::Mon : wxDateTime::Sun);

    if ( GetWindowStyle() & wxCAL_SHOW_SURROUNDING_WEEKS )
    {
        // We want to offset the calendar if we start on the first..
        if ( date.GetDay() == 1 )
        {
            date -= wxDateSpan::Week();
        }
    }

    return date;
}

bool wxCalendarCtrl::IsDateShown(const wxDateTime& date) const
{
    if ( !(GetWindowStyle() & wxCAL_SHOW_SURROUNDING_WEEKS) )
    {
        return date.GetMonth() == m_date.GetMonth();
    }
    else
    {
        return TRUE;
    }
}

bool wxCalendarCtrl::IsDateInRange(const wxDateTime& date) const
{
    bool retval = TRUE;
    // Check if the given date is in the range specified
    retval = ( ( ( m_lowdate.IsValid() ) ? ( date >= m_lowdate ) : TRUE )
        && ( ( m_highdate.IsValid() ) ? ( date <= m_highdate ) : TRUE ) );
    return retval;
}

bool wxCalendarCtrl::ChangeYear(wxDateTime* target) const
{
    bool retval = FALSE;

    if ( !(IsDateInRange(*target)) )
    {
        if ( target->GetYear() < m_date.GetYear() )
        {
            if ( target->GetYear() >= GetLowerDateLimit().GetYear() )
            {
                *target = GetLowerDateLimit();
                retval = TRUE;
            }
            else
            {
                *target = m_date;
            }
        }
        else
        {
            if ( target->GetYear() <= GetUpperDateLimit().GetYear() )
            {
                *target = GetUpperDateLimit();
                retval = TRUE;
            }
            else
            {
                *target = m_date;
            }
        }
    }
    else
    {
        retval = TRUE;
    }

    return retval;
}

bool wxCalendarCtrl::ChangeMonth(wxDateTime* target) const
{
    bool retval = TRUE;

    if ( !(IsDateInRange(*target)) )
    {
        retval = FALSE;

        if ( target->GetMonth() < m_date.GetMonth() )
        {
            *target = GetLowerDateLimit();
        }
        else
        {
            *target = GetUpperDateLimit();
        }
    }

    return retval;
}

size_t wxCalendarCtrl::GetWeek(const wxDateTime& date) const
{
    size_t retval = date.GetWeekOfMonth(GetWindowStyle() & wxCAL_MONDAY_FIRST
                                   ? wxDateTime::Monday_First
                                   : wxDateTime::Sunday_First);

    if ( (GetWindowStyle() & wxCAL_SHOW_SURROUNDING_WEEKS) )
    {
        // we need to offset an extra week if we "start" on the 1st of the month
        wxDateTime::Tm tm = date.GetTm();

        wxDateTime datetest = wxDateTime(1, tm.mon, tm.year);

        // rewind back
        datetest.SetToPrevWeekDay(GetWindowStyle() & wxCAL_MONDAY_FIRST
                              ? wxDateTime::Mon : wxDateTime::Sun);

        if ( datetest.GetDay() == 1 )
        {
            retval += 1;
        }
    }

    return retval;
}

// ----------------------------------------------------------------------------
// size management
// ----------------------------------------------------------------------------

// this is a composite control and it must arrange its parts each time its
// size or position changes: the combobox and spinctrl are along the top of
// the available area and the calendar takes up therest of the space

// the static controls are supposed to be always smaller than combo/spin so we
// always use the latter for size calculations and position the static to take
// the same space

// the constants used for the layout
#define VERT_MARGIN     5           // distance between combo and calendar
#define HORZ_MARGIN    15           //                            spin

wxSize wxCalendarCtrl::DoGetBestSize() const
{
    // calc the size of the calendar
    ((wxCalendarCtrl *)this)->RecalcGeometry(); // const_cast

    wxCoord width = 7*m_widthCol,
            height = 7*m_heightRow + m_rowOffset;

    // the combobox doesn't report its height correctly (it returns the
    // height including the drop down list) so don't use it

    if ( !(GetWindowStyle() & wxCAL_SEQUENTIAL_MONTH_SELECTION) )
    {
        height += VERT_MARGIN + m_spinYear->GetBestSize().y;
    }
    else
    {
        height += VERT_MARGIN;
    }

//    if ( GetWindowStyle() & (wxRAISED_BORDER | wxSUNKEN_BORDER) ) // This doesn't work. Default is wxBORDER_DEFAULT (0)
    if ( !(GetWindowStyle() & wxBORDER_NONE) )
    {
        // the border would clip the last line otherwise
        height += 6;
        width += 4;
    }

    return wxSize(width, height);
}

void wxCalendarCtrl::DoSetSize(int x, int y,
                               int width, int height,
                               int sizeFlags)
{
    wxControl::DoSetSize(x, y, width, height, sizeFlags);
}

void wxCalendarCtrl::DoMoveWindow(int x, int y, int width, int height)
{
    int xDiff = 0;
    int yDiff = 0;

    if ( !(GetWindowStyle() & wxCAL_SEQUENTIAL_MONTH_SELECTION) )
    {
        wxSize sizeCombo = m_comboMonth->GetSize();
        wxSize sizeStatic = m_staticMonth->GetSize();

        int dy = (sizeCombo.y - sizeStatic.y) / 2;

        m_comboMonth->Move(x, y);
        m_staticMonth->SetSize(x, y + dy, sizeCombo.x, sizeStatic.y);

        xDiff = sizeCombo.x + HORZ_MARGIN;

        m_spinYear->SetSize(x + xDiff, y, width - xDiff, sizeCombo.y);
        m_staticYear->SetSize(x + xDiff, y + dy, width - xDiff, sizeStatic.y);

        wxSize sizeSpin = m_spinYear->GetSize();
        yDiff = wxMax(sizeSpin.y, sizeCombo.y) + VERT_MARGIN;
    }

    wxControl::DoMoveWindow(x, y + yDiff, width, height - yDiff);
}

void wxCalendarCtrl::DoGetPosition(int *x, int *y) const
{
    wxControl::DoGetPosition(x, y);

    if ( !(GetWindowStyle() & wxCAL_SEQUENTIAL_MONTH_SELECTION) )
    {
        // our real top corner is not in this position
        if ( y )
        {
            *y -= GetMonthControl()->GetSize().y + VERT_MARGIN;
        }
    }
}

void wxCalendarCtrl::DoGetSize(int *width, int *height) const
{
    wxControl::DoGetSize(width, height);

    if ( !(GetWindowStyle() & wxCAL_SEQUENTIAL_MONTH_SELECTION) )
    {
        // our real height is bigger
        if ( height )
        {
            *height += GetMonthControl()->GetSize().y + VERT_MARGIN;
        }
    }
}

void wxCalendarCtrl::RecalcGeometry()
{
    if ( m_widthCol != 0 )
        return;

    wxClientDC dc(this);

    dc.SetFont(m_font);

    // determine the column width (we assume that the weekday names are always
    // wider (in any language) than the numbers)
    m_widthCol = 0;
    wxDateTime::WeekDay wd;
    for ( wd = wxDateTime::Sun; wd < wxDateTime::Inv_WeekDay; wxNextWDay(wd) )
    {
        wxCoord width;
        dc.GetTextExtent(m_weekdays[wd], &width, &m_heightRow);
        if ( width > m_widthCol )
        {
            m_widthCol = width;
        }
    }

    // leave some margins
    m_widthCol += 2;
    m_heightRow += 2;

    m_rowOffset = (GetWindowStyle() & wxCAL_SEQUENTIAL_MONTH_SELECTION) ? m_heightRow : 0; // conditional in relation to style
}

// ----------------------------------------------------------------------------
// drawing
// ----------------------------------------------------------------------------

void wxCalendarCtrl::OnPaint(wxPaintEvent& WXUNUSED(event))
{
    wxPaintDC dc(this);

    dc.SetFont(m_font);

    RecalcGeometry();

#if DEBUG_PAINT
    wxLogDebug("--- starting to paint, selection: %s, week %u\n",
           m_date.Format("%a %d-%m-%Y %H:%M:%S").c_str(),
           GetWeek(m_date));
#endif

    wxCoord y = 0;

/////////////////////////////////////////////////////////////////////////////////////////

    if ( (GetWindowStyle() & wxCAL_SEQUENTIAL_MONTH_SELECTION) )
    {
        // draw the sequential month-selector

        dc.SetBackgroundMode(wxTRANSPARENT);
        dc.SetTextForeground(*wxBLACK);
        dc.SetBrush(wxBrush(m_colHeaderBg, wxSOLID));
        dc.SetPen(wxPen(m_colHeaderBg, 1, wxSOLID));
        dc.DrawRectangle(0, y, 7*m_widthCol, m_heightRow);

        // Get extent of month-name + year
        wxCoord monthw, monthh;
        wxString headertext = m_date.Format(wxT("%B %Y"));
        dc.GetTextExtent(headertext, &monthw, &monthh);

        // draw month-name centered above weekdays
        wxCoord monthx = ((m_widthCol * 7) - monthw) / 2;
        wxCoord monthy = ((m_heightRow - monthh) / 2) + y;
        dc.DrawText(headertext, monthx,  monthy);

        // calculate the "month-arrows"
        wxPoint leftarrow[3];
        wxPoint rightarrow[3];

        int arrowheight = monthh / 2;

        leftarrow[0] = wxPoint(0, arrowheight / 2);
        leftarrow[1] = wxPoint(arrowheight / 2, 0);
        leftarrow[2] = wxPoint(arrowheight / 2, arrowheight - 1);

        rightarrow[0] = wxPoint(0, 0);
        rightarrow[1] = wxPoint(arrowheight / 2, arrowheight / 2);
        rightarrow[2] = wxPoint(0, arrowheight - 1);

        // draw the "month-arrows"

        wxCoord arrowy = (m_heightRow - arrowheight) / 2;
        wxCoord larrowx = (m_widthCol - (arrowheight / 2)) / 2;
        wxCoord rarrowx = ((m_widthCol - (arrowheight / 2)) / 2) + m_widthCol*6;
        m_leftArrowRect = wxRect(0, 0, 0, 0);
        m_rightArrowRect = wxRect(0, 0, 0, 0);

        if ( AllowMonthChange() )
        {
            wxDateTime ldpm = wxDateTime(1,m_date.GetMonth(), m_date.GetYear()) - wxDateSpan::Day(); // last day prev month
            // Check if range permits change
            if ( IsDateInRange(ldpm) && ( ( ldpm.GetYear() == m_date.GetYear() ) ? TRUE : AllowYearChange() ) )
            {
                m_leftArrowRect = wxRect(larrowx - 3, arrowy - 3, (arrowheight / 2) + 8, (arrowheight + 6));
                dc.SetBrush(wxBrush(*wxBLACK, wxSOLID));
                dc.SetPen(wxPen(*wxBLACK, 1, wxSOLID));
                dc.DrawPolygon(3, leftarrow, larrowx , arrowy, wxWINDING_RULE);
                dc.SetBrush(*wxTRANSPARENT_BRUSH);
                dc.DrawRectangle(m_leftArrowRect);
            }
            wxDateTime fdnm = wxDateTime(1,m_date.GetMonth(), m_date.GetYear()) + wxDateSpan::Month(); // first day next month
            if ( IsDateInRange(fdnm) && ( ( fdnm.GetYear() == m_date.GetYear() ) ? TRUE : AllowYearChange() ) )
            {
                m_rightArrowRect = wxRect(rarrowx - 4, arrowy - 3, (arrowheight / 2) + 8, (arrowheight + 6));
                dc.SetBrush(wxBrush(*wxBLACK, wxSOLID));
                dc.SetPen(wxPen(*wxBLACK, 1, wxSOLID));
                dc.DrawPolygon(3, rightarrow, rarrowx , arrowy, wxWINDING_RULE);
                dc.SetBrush(*wxTRANSPARENT_BRUSH);
                dc.DrawRectangle(m_rightArrowRect);
            }
        }

        y += m_heightRow;
    }

/////////////////////////////////////////////////////////////////////////////////////////

    // first draw the week days
    if ( IsExposed(0, y, 7*m_widthCol, m_heightRow) )
    {
#if DEBUG_PAINT
        wxLogDebug("painting the header");
#endif

        dc.SetBackgroundMode(wxTRANSPARENT);
        dc.SetTextForeground(m_colHeaderFg);
        dc.SetBrush(wxBrush(m_colHeaderBg, wxSOLID));
        dc.SetPen(wxPen(m_colHeaderBg, 1, wxSOLID));
        dc.DrawRectangle(0, y, 7*m_widthCol, m_heightRow);

        bool startOnMonday = (GetWindowStyle() & wxCAL_MONDAY_FIRST) != 0;
        for ( size_t wd = 0; wd < 7; wd++ )
        {
            size_t n;
            if ( startOnMonday )
                n = wd == 6 ? 0 : wd + 1;
            else
                n = wd;
            wxCoord dayw, dayh;
            dc.GetTextExtent(m_weekdays[n], &dayw, &dayh);
//            dc.DrawText(m_weekdays[n], wd*m_widthCol + 1, y);
            dc.DrawText(m_weekdays[n], (wd*m_widthCol) + ((m_widthCol- dayw) / 2), y); // center the day-name
        }
    }

    // then the calendar itself
    dc.SetTextForeground(*wxBLACK);
    //dc.SetFont(*wxNORMAL_FONT);

    y += m_heightRow;
    wxDateTime date = GetStartDate();

#if DEBUG_PAINT
    wxLogDebug("starting calendar from %s\n",
            date.Format("%a %d-%m-%Y %H:%M:%S").c_str());
#endif

    dc.SetBackgroundMode(wxSOLID);
    for ( size_t nWeek = 1; nWeek <= 6; nWeek++, y += m_heightRow )
    {
        // if the update region doesn't intersect this row, don't paint it
        if ( !IsExposed(0, y, 7*m_widthCol, m_heightRow - 1) )
        {
            date += wxDateSpan::Week();

            continue;
        }

#if DEBUG_PAINT
        wxLogDebug("painting week %d at y = %d\n", nWeek, y);
#endif

        for ( size_t wd = 0; wd < 7; wd++ )
        {
            if ( IsDateShown(date) )
            {
                // don't use wxDate::Format() which prepends 0s
                unsigned int day = date.GetDay();
                wxString dayStr = wxString::Format(_T("%u"), day);
                wxCoord width;
                dc.GetTextExtent(dayStr, &width, (wxCoord *)NULL);

                bool changedColours = FALSE,
                     changedFont = FALSE;

                bool isSel = FALSE;
                wxCalendarDateAttr *attr = NULL;

                if ( date.GetMonth() != m_date.GetMonth() || !IsDateInRange(date) )
                {
                    // surrounding week or out-of-range
                    // draw "disabled"
                    dc.SetTextForeground(*wxLIGHT_GREY);
                    changedColours = TRUE;
                }
                else
                {
                    isSel = date.IsSameDate(m_date);
                    attr = m_attrs[day - 1];

                    if ( isSel )
                    {
                        dc.SetTextForeground(m_colHighlightFg);
                        dc.SetTextBackground(m_colHighlightBg);

                        changedColours = TRUE;
                    }
                    else if ( attr )
                    {
                        wxColour colFg, colBg;

                        if ( attr->IsHoliday() )
                        {
                            colFg = m_colHolidayFg;
                            colBg = m_colHolidayBg;
                        }
                        else
                        {
                            colFg = attr->GetTextColour();
                            colBg = attr->GetBackgroundColour();
                        }

                        if ( colFg.Ok() )
                        {
                            dc.SetTextForeground(colFg);
                            changedColours = TRUE;
                        }

                        if ( colBg.Ok() )
                        {
                            dc.SetTextBackground(colBg);
                            changedColours = TRUE;
                        }

                        if ( attr->HasFont() )
                        {
                            dc.SetFont(attr->GetFont());
                            changedFont = TRUE;
                        }
                    }
                }

                wxCoord x = wd*m_widthCol + (m_widthCol - width) / 2;
                dc.DrawText(dayStr, x, y + 1);

                if ( !isSel && attr && attr->HasBorder() )
                {
                    wxColour colBorder;
                    if ( attr->HasBorderColour() )
                    {
                        colBorder = attr->GetBorderColour();
                    }
                    else
                    {
                        colBorder = m_foregroundColour;
                    }

                    wxPen pen(colBorder, 1, wxSOLID);
                    dc.SetPen(pen);
                    dc.SetBrush(*wxTRANSPARENT_BRUSH);

                    switch ( attr->GetBorder() )
                    {
                        case wxCAL_BORDER_SQUARE:
                            dc.DrawRectangle(x - 2, y,
                                             width + 4, m_heightRow);
                            break;

                        case wxCAL_BORDER_ROUND:
                            dc.DrawEllipse(x - 2, y,
                                           width + 4, m_heightRow);
                            break;

                        default:
                            wxFAIL_MSG(_T("unknown border type"));
                    }
                }

                if ( changedColours )
                {
                    dc.SetTextForeground(m_foregroundColour);
                    dc.SetTextBackground(m_backgroundColour);
                }

                if ( changedFont )
                {
                    dc.SetFont(m_font);
                }
            }
            //else: just don't draw it

            date += wxDateSpan::Day();
        }
    }

    // Greying out out-of-range background
    bool showSurrounding = (GetWindowStyle() & wxCAL_SHOW_SURROUNDING_WEEKS) != 0;

    date = ( showSurrounding ) ? GetStartDate() : wxDateTime(1, m_date.GetMonth(), m_date.GetYear());
    if ( !IsDateInRange(date) )
    {
        wxDateTime firstOOR = GetLowerDateLimit() - wxDateSpan::Day(); // first out-of-range

        wxBrush oorbrush = *wxLIGHT_GREY_BRUSH;
        oorbrush.SetStyle(wxFDIAGONAL_HATCH);

        HighlightRange(&dc, date, firstOOR, wxTRANSPARENT_PEN, &oorbrush);
    }

    date = ( showSurrounding ) ? GetStartDate() + wxDateSpan::Weeks(6) - wxDateSpan::Day() : wxDateTime().SetToLastMonthDay(m_date.GetMonth(), m_date.GetYear());
    if ( !IsDateInRange(date) )
    {
        wxDateTime firstOOR = GetUpperDateLimit() + wxDateSpan::Day(); // first out-of-range

        wxBrush oorbrush = *wxLIGHT_GREY_BRUSH;
        oorbrush.SetStyle(wxFDIAGONAL_HATCH);

        HighlightRange(&dc, firstOOR, date, wxTRANSPARENT_PEN, &oorbrush);
    }

#if DEBUG_PAINT
    wxLogDebug("+++ finished painting");
#endif
}

void wxCalendarCtrl::RefreshDate(const wxDateTime& date)
{
    RecalcGeometry();

    wxRect rect;

    // always refresh the whole row at once because our OnPaint() will draw
    // the whole row anyhow - and this allows the small optimisation in
    // OnClick() below to work
    rect.x = 0;

    rect.y = (m_heightRow * GetWeek(date)) + m_rowOffset;

    rect.width = 7*m_widthCol;
    rect.height = m_heightRow;

#ifdef __WXMSW__
    // VZ: for some reason, the selected date seems to occupy more space under
    //     MSW - this is probably some bug in the font size calculations, but I
    //     don't know where exactly. This fix is ugly and leads to more
    //     refreshes than really needed, but without it the selected days
    //     leaves even more ugly underscores on screen.
    rect.Inflate(0, 1);
#endif // MSW

#if DEBUG_PAINT
    wxLogDebug("*** refreshing week %d at (%d, %d)-(%d, %d)\n",
           GetWeek(date),
           rect.x, rect.y,
           rect.x + rect.width, rect.y + rect.height);
#endif

    Refresh(TRUE, &rect);
}

void wxCalendarCtrl::HighlightRange(wxPaintDC* pDC, const wxDateTime& fromdate, const wxDateTime& todate, wxPen* pPen, wxBrush* pBrush)
{
    // Highlights the given range using pen and brush
    // Does nothing if todate < fromdate


#if DEBUG_PAINT
    wxLogDebug("+++ HighlightRange: (%s) - (%s) +++", fromdate.Format("%d %m %Y"), todate.Format("%d %m %Y"));
#endif

    if ( todate >= fromdate )
    {
        // do stuff
        // date-coordinates
        int fd, fw;
        int td, tw;

        // implicit: both dates must be currently shown - checked by GetDateCoord
        if ( GetDateCoord(fromdate, &fd, &fw) && GetDateCoord(todate, &td, &tw) )
        {
#if DEBUG_PAINT
            wxLogDebug("Highlight range: (%i, %i) - (%i, %i)", fd, fw, td, tw);
#endif
            if ( ( (tw - fw) == 1 ) && ( td < fd ) )
            {
                // special case: interval 7 days or less not in same week
                // split in two seperate intervals
                wxDateTime tfd = fromdate + wxDateSpan::Days(7-fd);
                wxDateTime ftd = tfd + wxDateSpan::Day();
#if DEBUG_PAINT
                wxLogDebug("Highlight: Seperate segments");
#endif
                // draw seperately
                HighlightRange(pDC, fromdate, tfd, pPen, pBrush);
                HighlightRange(pDC, ftd, todate, pPen, pBrush);
            }
            else
            {
                int numpoints;
                wxPoint corners[8]; // potentially 8 corners in polygon

                if ( fw == tw )
                {
                    // simple case: same week
                    numpoints = 4;
                    corners[0] = wxPoint((fd - 1) * m_widthCol, (fw * m_heightRow) + m_rowOffset);
                    corners[1] = wxPoint((fd - 1) * m_widthCol, ((fw + 1 ) * m_heightRow) + m_rowOffset);
                    corners[2] = wxPoint(td * m_widthCol, ((tw + 1) * m_heightRow) + m_rowOffset);
                    corners[3] = wxPoint(td * m_widthCol, (tw * m_heightRow) + m_rowOffset);
                }
                else
                {
                    int cidx = 0;
                    // "complex" polygon
                    corners[cidx] = wxPoint((fd - 1) * m_widthCol, (fw * m_heightRow) + m_rowOffset); cidx++;

                    if ( fd > 1 )
                    {
                        corners[cidx] = wxPoint((fd - 1) * m_widthCol, ((fw + 1) * m_heightRow) + m_rowOffset); cidx++;
                        corners[cidx] = wxPoint(0, ((fw + 1) * m_heightRow) + m_rowOffset); cidx++;
                    }

                    corners[cidx] = wxPoint(0, ((tw + 1) * m_heightRow) + m_rowOffset); cidx++;
                    corners[cidx] = wxPoint(td * m_widthCol, ((tw + 1) * m_heightRow) + m_rowOffset); cidx++;

                    if ( td < 7 )
                    {
                        corners[cidx] = wxPoint(td * m_widthCol, (tw * m_heightRow) + m_rowOffset); cidx++;
                        corners[cidx] = wxPoint(7 * m_widthCol, (tw * m_heightRow) + m_rowOffset); cidx++;
                    }

                    corners[cidx] = wxPoint(7 * m_widthCol, (fw * m_heightRow) + m_rowOffset); cidx++;

                    numpoints = cidx;
                }

                // draw the polygon
                pDC->SetBrush(*pBrush);
                pDC->SetPen(*pPen);
                pDC->DrawPolygon(numpoints, corners);
            }
        }
    }
    // else do nothing
#if DEBUG_PAINT
    wxLogDebug("--- HighlightRange ---");
#endif
}

bool wxCalendarCtrl::GetDateCoord(const wxDateTime& date, int *day, int *week) const
{
    bool retval = TRUE;

#if DEBUG_PAINT
    wxLogDebug("+++ GetDateCoord: (%s) +++", date.Format("%d %m %Y"));
#endif

    if ( IsDateShown(date) )
    {
        bool startOnMonday = ( GetWindowStyle() & wxCAL_MONDAY_FIRST ) != 0;

        // Find day
        *day = date.GetWeekDay();

        if ( *day == 0 ) // sunday
        {
            *day = ( startOnMonday ) ? 7 : 1;
        }
        else
        {
            day += ( startOnMonday ) ? 0 : 1;
        }

        int targetmonth = date.GetMonth() + (12 * date.GetYear());
        int thismonth = m_date.GetMonth() + (12 * m_date.GetYear());

        // Find week
        if ( targetmonth == thismonth )
        {
            *week = GetWeek(date);
        }
        else
        {
            if ( targetmonth < thismonth )
            {
                *week = 1; // trivial
            }
            else // targetmonth > thismonth
            {
                wxDateTime ldcm;
                int lastweek;
                int lastday;

                // get the datecoord of the last day in the month currently shown
#if DEBUG_PAINT
                wxLogDebug("     +++ LDOM +++");
#endif
                GetDateCoord(ldcm.SetToLastMonthDay(m_date.GetMonth(), m_date.GetYear()), &lastday, &lastweek);
#if DEBUG_PAINT
                wxLogDebug("     --- LDOM ---");
#endif

                wxTimeSpan span = date - ldcm;

                int daysfromlast = span.GetDays();
#if DEBUG_PAINT
                wxLogDebug("daysfromlast: %i", daysfromlast);
#endif
                if ( daysfromlast + lastday > 7 ) // past week boundary
                {
                    int wholeweeks = (daysfromlast / 7);
                    *week = wholeweeks + lastweek;
                    if ( (daysfromlast - (7 * wholeweeks) + lastday) > 7 )
                    {
                        *week += 1;
                    }
                }
                else
                {
                    *week = lastweek;
                }
            }
        }
    }
    else
    {
        *day = -1;
        *week = -1;
        retval = FALSE;
    }

#if DEBUG_PAINT
    wxLogDebug("--- GetDateCoord: (%s) = (%i, %i) ---", date.Format("%d %m %Y"), *day, *week);
#endif

    return retval;
}

// ----------------------------------------------------------------------------
// mouse handling
// ----------------------------------------------------------------------------

void wxCalendarCtrl::OnDClick(wxMouseEvent& event)
{
    if ( HitTest(event.GetPosition()) != wxCAL_HITTEST_DAY )
    {
        event.Skip();
    }
    else
    {
        GenerateEvent(wxEVT_CALENDAR_DOUBLECLICKED);
    }
}

void wxCalendarCtrl::OnClick(wxMouseEvent& event)
{
    wxDateTime date;
    wxDateTime::WeekDay wday;
    switch ( HitTest(event.GetPosition(), &date, &wday) )
    {
        case wxCAL_HITTEST_DAY:
            if ( IsDateInRange(date) )
            {
                ChangeDay(date);

                GenerateEvents(wxEVT_CALENDAR_DAY_CHANGED,
                               wxEVT_CALENDAR_SEL_CHANGED);
            }
            break;

        case wxCAL_HITTEST_HEADER:
            {
                wxCalendarEvent event(this, wxEVT_CALENDAR_WEEKDAY_CLICKED);
                event.m_wday = wday;
                (void)GetEventHandler()->ProcessEvent(event);
            }
            break;

        case wxCAL_HITTEST_DECMONTH:
        case wxCAL_HITTEST_INCMONTH:
        case wxCAL_HITTEST_SURROUNDING_WEEK:
            SetDateAndNotify(date); // we probably only want to refresh the control. No notification.. (maybe as an option?)
            break;

        default:
            wxFAIL_MSG(_T("unknown hittest code"));
            // fall through

        case wxCAL_HITTEST_NOWHERE:
            event.Skip();
            break;
    }
}

wxCalendarHitTestResult wxCalendarCtrl::HitTest(const wxPoint& pos,
                                                wxDateTime *date,
                                                wxDateTime::WeekDay *wd)
{
    RecalcGeometry();

    wxCoord y = pos.y;

///////////////////////////////////////////////////////////////////////////////////////////////////////
    if ( (GetWindowStyle() & wxCAL_SEQUENTIAL_MONTH_SELECTION) )
    {
        // Header: month

        // we need to find out if the hit is on left arrow, on month or on right arrow
        // left arrow?
        if ( wxRegion(m_leftArrowRect).Contains(pos) == wxInRegion )
        {
            if ( date )
            {
                if ( IsDateInRange(m_date - wxDateSpan::Month()) )
                {
                    *date = m_date - wxDateSpan::Month();
                }
                else
                {
                    *date = GetLowerDateLimit();
                }
            }

            return wxCAL_HITTEST_DECMONTH;
        }

        if ( wxRegion(m_rightArrowRect).Contains(pos) == wxInRegion )
        {
            if ( date )
            {
                if ( IsDateInRange(m_date + wxDateSpan::Month()) )
                {
                    *date = m_date + wxDateSpan::Month();
                }
                else
                {
                    *date = GetUpperDateLimit();
                }
            }

            return wxCAL_HITTEST_INCMONTH;
        }

    }

///////////////////////////////////////////////////////////////////////////////////////////////////////
    // Header: Days
    int wday = pos.x / m_widthCol;
//    if ( y < m_heightRow )
    if ( y < (m_heightRow + m_rowOffset) )
    {
        if ( y > m_rowOffset )
        {
            if ( wd )
            {
                if ( GetWindowStyle() & wxCAL_MONDAY_FIRST )
                {
                    wday = wday == 6 ? 0 : wday + 1;
                }

                *wd = (wxDateTime::WeekDay)wday;
            }

            return wxCAL_HITTEST_HEADER;
        }
        else
        {
            return wxCAL_HITTEST_NOWHERE;
        }
    }

//    int week = (y - m_heightRow) / m_heightRow;
    int week = (y - (m_heightRow + m_rowOffset)) / m_heightRow;
    if ( week >= 6 || wday >= 7 )
    {
        return wxCAL_HITTEST_NOWHERE;
    }

    wxDateTime dt = GetStartDate() + wxDateSpan::Days(7*week + wday);

    if ( IsDateShown(dt) )
    {
        if ( date )
            *date = dt;

        if ( dt.GetMonth() == m_date.GetMonth() )
        {

            return wxCAL_HITTEST_DAY;
        }
        else
        {
            return wxCAL_HITTEST_SURROUNDING_WEEK;
        }
    }
    else
    {
        return wxCAL_HITTEST_NOWHERE;
    }
}

// ----------------------------------------------------------------------------
// subcontrols events handling
// ----------------------------------------------------------------------------

void wxCalendarCtrl::OnMonthChange(wxCommandEvent& event)
{
    wxDateTime::Tm tm = m_date.GetTm();

    wxDateTime::Month mon = (wxDateTime::Month)event.GetInt();
    if ( tm.mday > wxDateTime::GetNumberOfDays(mon, tm.year) )
    {
        tm.mday = wxDateTime::GetNumberOfDays(mon, tm.year);
    }

    wxDateTime target = wxDateTime(tm.mday, mon, tm.year);

    ChangeMonth(&target);
    SetDateAndNotify(target);
}

void wxCalendarCtrl::OnYearChange(wxSpinEvent& event)
{
    wxDateTime::Tm tm = m_date.GetTm();

    int year = (int)event.GetInt();
    if ( tm.mday > wxDateTime::GetNumberOfDays(tm.mon, year) )
    {
        tm.mday = wxDateTime::GetNumberOfDays(tm.mon, year);
    }

    wxDateTime target = wxDateTime(tm.mday, tm.mon, year);

    if ( ChangeYear(&target) )
    {
        SetDateAndNotify(target);
    }
    else
    {
        // In this case we don't want to change the date. That would put us
        // inside the same year but a strange number of months forward/back..
        m_spinYear->SetValue(target.GetYear());
    }

}

// ----------------------------------------------------------------------------
// keyboard interface
// ----------------------------------------------------------------------------

void wxCalendarCtrl::OnChar(wxKeyEvent& event)
{
    wxDateTime target;
    switch ( event.KeyCode() )
    {
        case _T('+'):
        case WXK_ADD:
            target = m_date + wxDateSpan::Year();
            if ( ChangeYear(&target) )
            {
                SetDateAndNotify(target);
            }
            break;

        case _T('-'):
        case WXK_SUBTRACT:
            target = m_date - wxDateSpan::Year();
            if ( ChangeYear(&target) )
            {
                SetDateAndNotify(target);
            }
            break;

        case WXK_PRIOR:
            target = m_date - wxDateSpan::Month();
            ChangeMonth(&target);
            SetDateAndNotify(target); // always
            break;

        case WXK_NEXT:
            target = m_date + wxDateSpan::Month();
            ChangeMonth(&target);
            SetDateAndNotify(target); // always
            break;

        case WXK_RIGHT:
            if ( event.ControlDown() )
            {
                target = wxDateTime(m_date).SetToNextWeekDay(
                                 GetWindowStyle() & wxCAL_MONDAY_FIRST
                                 ? wxDateTime::Sun : wxDateTime::Sat);
                if ( !IsDateInRange(target) )
                {
                    target = GetUpperDateLimit();
                }
                SetDateAndNotify(target);
            }
            else
                SetDateAndNotify(m_date + wxDateSpan::Day());
            break;

        case WXK_LEFT:
            if ( event.ControlDown() )
            {
                target = wxDateTime(m_date).SetToPrevWeekDay(
                                 GetWindowStyle() & wxCAL_MONDAY_FIRST
                                 ? wxDateTime::Mon : wxDateTime::Sun);
                if ( !IsDateInRange(target) )
                {
                    target = GetLowerDateLimit();
                }
                SetDateAndNotify(target);
            }
            else
                SetDateAndNotify(m_date - wxDateSpan::Day());
            break;

        case WXK_UP:
            SetDateAndNotify(m_date - wxDateSpan::Week());
            break;

        case WXK_DOWN:
            SetDateAndNotify(m_date + wxDateSpan::Week());
            break;

        case WXK_HOME:
            if ( event.ControlDown() )
                SetDateAndNotify(wxDateTime::Today());
            else
                SetDateAndNotify(wxDateTime(1, m_date.GetMonth(), m_date.GetYear()));
            break;

        case WXK_END:
            SetDateAndNotify(wxDateTime(m_date).SetToLastMonthDay());
            break;

        case WXK_RETURN:
            GenerateEvent(wxEVT_CALENDAR_DOUBLECLICKED);
            break;

        default:
            event.Skip();
    }
}

// ----------------------------------------------------------------------------
// holidays handling
// ----------------------------------------------------------------------------

void wxCalendarCtrl::EnableHolidayDisplay(bool display)
{
    long style = GetWindowStyle();
    if ( display )
        style |= wxCAL_SHOW_HOLIDAYS;
    else
        style &= ~wxCAL_SHOW_HOLIDAYS;

    SetWindowStyle(style);

    if ( display )
        SetHolidayAttrs();
    else
        ResetHolidayAttrs();

    Refresh();
}

void wxCalendarCtrl::SetHolidayAttrs()
{
    if ( GetWindowStyle() & wxCAL_SHOW_HOLIDAYS )
    {
        ResetHolidayAttrs();

        wxDateTime::Tm tm = m_date.GetTm();
        wxDateTime dtStart(1, tm.mon, tm.year),
                   dtEnd = dtStart.GetLastMonthDay();

        wxDateTimeArray hol;
        wxDateTimeHolidayAuthority::GetHolidaysInRange(dtStart, dtEnd, hol);

        size_t count = hol.GetCount();
        for ( size_t n = 0; n < count; n++ )
        {
            SetHoliday(hol[n].GetDay());
        }
    }
}

void wxCalendarCtrl::SetHoliday(size_t day)
{
    wxCHECK_RET( day > 0 && day < 32, _T("invalid day in SetHoliday") );

    wxCalendarDateAttr *attr = GetAttr(day);
    if ( !attr )
    {
        attr = new wxCalendarDateAttr;
    }

    attr->SetHoliday(TRUE);

    // can't use SetAttr() because it would delete this pointer
    m_attrs[day - 1] = attr;
}

void wxCalendarCtrl::ResetHolidayAttrs()
{
    for ( size_t day = 0; day < 31; day++ )
    {
        if ( m_attrs[day] )
        {
            m_attrs[day]->SetHoliday(FALSE);
        }
    }
}

// ----------------------------------------------------------------------------
// wxCalendarEvent
// ----------------------------------------------------------------------------

void wxCalendarEvent::Init()
{
    m_wday = wxDateTime::Inv_WeekDay;
}

wxCalendarEvent::wxCalendarEvent(wxCalendarCtrl *cal, wxEventType type)
               : wxCommandEvent(type, cal->GetId())
{
    m_date = cal->GetDate();
    SetEventObject(cal);
}

#endif // wxUSE_CALENDARCTRL