; IDL> testwid,julday(1,1,1980)+lindgen(100)*5
;
; PRO testwid_event, event
;     ComboboxId = widget_info(event.top,find_by_uname = 'c''est lui')
;    widget_control, event.id, get_uvalue=uval
;    if n_elements(uval) EQ 0 then return
;    case uval of
;       'done':widget_control, event.top, /destroy
;       'set':BEGIN
;          widget_control, event.id, get_value = value
;          widget_control, ComboboxId, set_value = value
;       END
;       'get':BEGIN
;          widget_control, ComboboxId, get_value = value
;          help,  value, /struct
;       END
;       ELSE:
;    endcase
;    return
; end
; PRO testwid, calendar, date0, _extra = ex
;    base=widget_base(/COLUMN)
; print, 'base=', base
;    nothing = widget_label(base, value = 'beginning of the test')
; ;
;    nothing = cw_calendar(base,calendar, date0, _extra = ex, uname = 'c''est lui', uvalue = 'c''est lui' )
; print, 'cw_calendar ID =', nothing
; ;
;    nothing = widget_label(base, value = 'end of the test')
;     nothing = widget_text(base, value = string(calendar[0]), uvalue = 'set', /editable)
;     nothing = widget_button(base, value = 'get', uvalue = 'get')
;     nothing = widget_button(base, value = 'done', uvalue = 'done')
;    widget_control, base, /REALIZE
;    xmanager,'testwid', base
;    return
; END
;
;
;+
;
; @file_comments
;
; @categories
; Compound widget
;
; @param ID
;
; @param VALUE
; It is the default tick mark value (a floating-point number).
;
; @returns
;
; @uses
;
; @restrictions
;
; @examples
;
; @history
;
; @version
; $Id$
;-
;
PRO cw_calendar_set_value, id, value
;
  compile_opt strictarr, strictarrsubs
;
@cm_4cal
; get back the calendar and its related informations
  winfo_id = widget_info(id, find_by_uname = 'infocal')
  widget_control, winfo_id, get_uvalue = infowid
  key_caltype = infowid.caltype

; high freqeuncy calendar
  IF keyword_set(infowid.fakecal) THEN BEGIN
    value2 = date2jul(long(value)) - infowid.fakecal
    IF value2 LT n_elements(infowid.calendar) AND value2 GE 0 THEN BEGIN
      stepid = widget_info(id, find_by_uname = 'step')
      widget_control, stepid, set_value = {combobox_select:value2}
      infowid.date = jul2date(value2 + infowid.fakecal)
      widget_control, winfo_id, set_uvalue = infowid
    ENDIF
  ENDIF ELSE BEGIN
;
    value = long(value[0])
; make sure the value correspond
    value = jul2date(date2jul(value))
; define year month day
    year = value/10000l
    month = (value MOD 10000L)/100L
    day = value MOD 100L
; check that the date exists in the calendar
  if (where(infowid.calendar EQ julday(month, day, year)))[0] EQ - 1 then return
; update the value of infocal
    infowid.date = value
    widget_control, winfo_id, set_uvalue = infowid
; update the combobox if needed...
    possiblecase = ['day', 'month', 'year']
    for name = 2, 0, -1 do BEGIN
; call set_cal_combobox with out = 2 to specify that the call is coming
; from cw_calendar_set_value
      if widget_info(id, find_by_uname = possiblecase[name]) NE 0 then $
         set_cal_combobox, {handler:id, out:2}, possiblecase[name], value
    ENDFOR
  ENDELSE
;
  return
end
;----------------------------------------------------------------------
;+
; @file_comments
;
;
; @categories
; Compound widget
;
; @param ID
;
;
; @returns
;
; @uses
;
; @restrictions
;
; @examples
;
; @history
;
; @version
; $Id$
;-
;
FUNCTION cw_calendar_get_value, id
;
  compile_opt strictarr, strictarrsubs
;
  winfo_id = widget_info(id, find_by_uname = 'infocal')
  widget_control, winfo_id, get_uvalue = infowid
  return, infowid.date
END
;----------------------------------------------------------------------
;+
; @file_comments
;
;
; @categories
; Compound widget
;
; @param ID
;
;
; @param WINFOID
;
;
; @returns
;
; @uses
;
; @restrictions
;
; @examples
;
; @history
;
; @version
; $Id$
;-
;
FUNCTION get_cal_value, id, winfoid
;
  compile_opt strictarr, strictarrsubs
;
  winfo_id = widget_info(id, find_by_uname = 'infocal')
  widget_control, winfo_id, get_uvalue = infowid
  oldate = infowid.date
;-------------day-----------------
  wid_id = widget_info(id, find_by_uname = 'day')
  if wid_id NE 0 then BEGIN
    widget_control, wid_id, get_value = wid_value
    date = long(wid_value.combobox_gettext)
  ENDIF ELSE date = oldate MOD 100L
;-------------month---------------
  wid_id = widget_info(id, find_by_uname = 'month')
  if wid_id NE 0 then BEGIN
    widget_control, wid_id, get_value = wid_value
    allmonths = string(format = '(C(CMoA))', 31*(indgen(12)))
    month = (where(allmonths EQ wid_value.combobox_gettext))[0] + 1
    date = date + 100L * long(month)
  ENDIF ELSE date = date + (oldate MOD 10000L)/100L*100L
;-------------year----------------
  wid_id = widget_info(id, find_by_uname = 'year')
  widget_control, wid_id, get_value = wid_value
  date = date + 10000L * long(wid_value.combobox_gettext)
;
  IF arg_present(winfoid) NE 0 THEN BEGIN
    winfoid = winfo_id
    infowid.date = date
    return, infowid
  ENDIF ELSE return, date
end
;----------------------------------------------------------------------
; redefine the value and index position of the combobox
;+
; @file_comments
;
;
; @categories
; Compound widget
;
; @param EVENT
;
;
; @param CASENAME
;
;
; @param DATE0
;
;
; @returns
;
; @uses
;
; @restrictions
;
; @examples
;
; @history
;
; @version
; $Id$
;-
PRO set_cal_combobox, event, casename, date0
;
  compile_opt strictarr, strictarrsubs
;
; casename: Which widget shall we move: 'day', 'month' or 'year' ?
  wid_id = widget_info(event.handler, find_by_uname = casename)
; we get back the calendar...
  winfo_id = widget_info(event.handler, find_by_uname = 'infocal')
  widget_control, winfo_id, get_uvalue = infowid
  caldat, infowid.calendar, monthcal, daycal, yearcal
; ... and the current date
  IF n_elements(date0) EQ 0 then date0 = get_cal_value(event.handler)
  year0 = date0/10000L
  month0 = (date0 MOD 10000L)/100L
  day0 = date0 MOD 100L
; index of days/months/years according to date0
  case casename of
    'day':BEGIN
; list of days corresponding to month0 and year0
      index = where(monthcal EQ month0 AND yearcal EQ year0)
      current = daycal[index]
    END
    'month':BEGIN
; list of months corresponding to year0
      index = where(yearcal EQ year0)
      current = monthcal[index]
; keep only the uniq values
      indexbis = uniq(current)
      index = index[indexbis]
      current = current[indexbis]
    END
    'year':BEGIN
; keep only the uniq years
      index = uniq(yearcal)
      current = yearcal[index]
    END
  ENDCASE
; we update the uvalue of the widget
  widget_control, wid_id, set_uvalue = {name:casename}
; for event.out = 0, we store the previous position of the combobox to use
; it as the default position.
  IF event.out EQ 0 THEN widget_control, wid_id, get_value = oldselect
; we redefine the new list
  if casename EQ 'month' then begin
    widget_control, wid_id, set_value = string(format = '(C(CMoA))', 31*(current-1))
  ENDIF ELSE BEGIN
    widget_control, wid_id, set_value = strtrim(current, 1)
  ENDELSE
; specify the index position within the new list of values.
  widget_control, wid_id, get_value = combobox
  CASE event.out OF
; -1: we put to the biggest position
    -1:selected = combobox.combobox_number - 1
; 0: same as the previous position is the best choice...
    0:selected = oldselect.combobox_index < (combobox.combobox_number - 1)
; 1: we put to the smallest position
    1:selected = 0
; 2: a new date has been specified...
    2:BEGIN
      case casename of
        'day':selected = (where(current EQ day0))[0]
        'month':selected = (where(current EQ month0))[0]
        'year':selected = (where(current EQ year0))[0]
      ENDCASE
    END
  ENDCASE
  widget_control, wid_id, set_value = {combobox_select:selected}
; update the date...
  infowid.date = get_cal_value(event.handler)
  widget_control, winfo_id, set_uvalue = infowid
  return
end
;----------------------------------------------------------------------
; move cyclically the calendar to the
; value 0 if event.out=1 or combobox_number-1 if event.out=-1
;+
; @file_comments
;
;
; @categories
; Compound widget
;
; @param EVENT
;
;
; @param CASENAME
;
;
; @returns
;
; @uses
;
; @restrictions
;
; @examples
;
; @history
;
; @version
; $Id$
;-
PRO move, event, casename
;
  compile_opt strictarr, strictarrsubs
;
   possiblecase = ['day', 'month', 'year', 'impossiblecase']
   id = widget_info(event.handler, find_by_uname = casename)
   widget_control, id, get_value = wvalue
; we try to move but we are already at the beginning/end of the combobox
; wvalue.combobox_index EQ (wvalue.combobox_number-1) and event.out EQ 1
; wvalue.combobox_index EQ 0 and event.out EQ -1 (move is not called when out eq 0)
   whichcase = (where(possiblecase EQ casename))[0]
   if wvalue.combobox_index EQ (wvalue.combobox_number-1)*(event.out EQ 1) THEN BEGIN
      if widget_info(event.handler, find_by_uname = possiblecase[whichcase+1]) EQ 0 then begin
; it is impossible to move the "next" combobox...
         widget_control, id, get_value = widvalue
; we set to "widvalue.combobox_number-1" when event.out EQ -1
; and to 0 when event.out EQ 1
         selected = (widvalue.combobox_number-1)*(event.out EQ -1)
         widget_control, id, set_value = {combobox_select:selected}
; we call move for the next combobox
      ENDIF ELSE move, event, possiblecase[whichcase+1]
; it is possible to move from +/- 1
   ENDIF ELSE widget_control, id, set_value = {combobox_select:wvalue.combobox_index+event.out}
   set_cal_combobox, event, possiblecase[whichcase-1]
   return
end
;----------------------------------------------------------------------
;+
; @file_comments
;
;
; @categories
; Compound widget
;
; @param EVENT
;
;
; @returns
;
; @uses
;
; @restrictions
;
; @examples
;
; @history
;
; @version
; $Id$
;-
FUNCTION cw_calendar_event, event
;
@cm_4cal
  compile_opt strictarr, strictarrsubs
;
  winfo_id = widget_info(event.handler, find_by_uname = 'infocal')
  widget_control, winfo_id, get_uvalue = infowid
  key_caltype = infowid.caltype
;
  widget_control, event.id, get_uvalue = uval
; high frequency calendar
  IF uval.name EQ 'step' THEN BEGIN
    infowid.date = jul2date(event.index + infowid.fakecal)
  ENDIF ELSE BEGIN
;
    possiblecase = ['day', 'month', 'year', 'impossiblecase']
    whichcase = (where(possiblecase EQ uval.name))[0]
    if event.out NE 0 then BEGIN ; we use the +/- button and we want to go out of the combobox:
; to index = -1 (event.out=-1) or to index = combobox_number (event.out=1)
; we try to move the combobox just right, with name: possiblecase[whichcase+1]
      if widget_info(event.handler, find_by_uname = possiblecase[whichcase+1]) EQ 0 then BEGIN
; this widget do not exist we set cyclically the current widget to the
; value 0 if event.out=1 or combobox_number-1 if event.out=-1
        widget_control, event.id, get_value = widvalue
        selected = (widvalue.combobox_number-1)*(event.out EQ -1)
        widget_control, event.id, set_value = {combobox_select:selected}
      ENDIF ELSE move, event, possiblecase[whichcase+1]
    ENDIF
; if we changed month(year), we need to update the day (and month) list
    if uval.name NE 'day' then begin
      event.out = 0
      for name = whichcase-1, 0, -1 do BEGIN
        if widget_info(event.handler, find_by_uname = possiblecase[name]) NE 0 then $
           set_cal_combobox, event, possiblecase[name]
      endfor
    ENDIF
; we update the date
    infowid = get_cal_value(event.handler, winfo_id)
  ENDELSE
;
  widget_control, winfo_id, set_uvalue = infowid
  return, {CW_CALENDAR, ID:event.handler, TOP:event.top, HANDLER:0L $
           , VALUE:infowid.date, FAKECAL: infowid.fakecal}
end
;----------------------------------------------------------------------
;----------------------------------------------------------------------
;+
; @file_comments
;
;
; @categories
; Compound widget
;
; @param PARENT {in}{required}
; The widget ID of the parent widget.
;
; @param CALENDAR
;
;
; @param JDATE0
;
; @keyword CALTYPE
;
; @keyword FAKECAL
;
;
; @keyword UVALUE
;
; @keyword UNAME
;
;
; @keyword _EXTRA
; Used to pass keywords
;
; @returns
;
; @uses
;
; @restrictions
;
; @examples
;
; @history
;
; @version
; $Id$
;
; @todo
; seb
;
;-
;
FUNCTION cw_calendar, parent, calendar, jdate0, CALTYPE = CALTYPE, FAKECAL = fakecal, UVALUE = uvalue, UNAME = uname, _EXTRA = ex
;
@cm_4cal
;
  compile_opt strictarr, strictarrsubs
;
  if keyword_set(caltype) then key_caltype = caltype
; months days years found in the calendar
  caldat, calendar, monthcal, daycal, yearcal, hourcal, mincal, scdcal
; starting date
  if n_elements(jdate0) EQ 0 then jdate0 = calendar[0]
  if (where(calendar EQ jdate0))[0] EQ -1 then jdate0 = calendar[0]
;
  caldat, jdate0, month0, day0, year0
; test the type of calendar
  if n_elements(calendar) GT 1 then BEGIN
; each day have the same value
    if n_elements(uniq(daycal, sort(daycal))) EQ 1 then monthly = 1
; each month and each day have the same value
    if keyword_set(monthly) AND n_elements(uniq(monthcal, sort(monthcal))) EQ 1 then yearly = 1
  endif
;---------------------------------------------------------------------------------------
  if NOT keyword_set(uvalue) then uvalue = {dummy:''}
  if NOT keyword_set(uname) then uname = ''
  base0 = widget_base(parent, /ROW $
                      , EVENT_FUNC = 'cw_calendar_event' $
                      , FUNC_GET_VALUE = 'cw_calendar_get_value' $
                      , PRO_SET_VALUE = 'cw_calendar_set_value' $
                      , UVALUE = uvalue, UNAME = uname, space = 0, _extra = ex)
;

  if n_elements(fakecal) eq 0 then fakecal = 0
  base = widget_base(base0, space = 0, uname = 'infocal' $
                     , uvalue = {calendar:calendar, date:jul2date(jdate0), fakecal:fakecal, caltype: key_caltype})
;
  IF keyword_set(fakecal) THEN BEGIN
    cmbbid = cw_combobox_pm(base, UVALUE = {name:'step'}, UNAME = 'step' $
                            , value = strtrim(indgen(n_elements(calendar)), 1))
    widget_control, cmbbid, set_value = {combobox_select:(where(calendar EQ jdate0))[0]}
  ENDIF ELSE BEGIN
;
    vallen = widget_info(base, string_size = 'm')
;-------------day-----------------
    if NOT keyword_set(monthly)  then begin
      dayindex = where(monthcal EQ month0 AND yearcal EQ year0)
      currentday = daycal[dayindex]
      currentday = strtrim(currentday, 1)
      cmbbid = cw_combobox_pm(base, UVALUE = {name:'day'}, UNAME = 'day', value = currentday)
      widget_control, cmbbid, set_value = {combobox_select:(where(long(currentday) EQ day0))[0]}
    endif
;-------------month---------------
    if NOT keyword_set(yearly)  then BEGIN
      monthindex = where(yearcal EQ year0)
      currentmonth = long(monthcal[monthindex])
; we suppress the repeted months
      monthindexbis = uniq(currentmonth, sort(currentmonth))
      monthindex = monthindex[monthindexbis]
      currentmonth = currentmonth[monthindexbis]
      xoff = (34 + 2*vallen[0])*(1-keyword_set(monthly))
      cmbbid = cw_combobox_pm(base, UVALUE = {name:'month'}, UNAME = 'month', value = string(format = '(C(CMoA))', 31*(currentmonth-1)), xoffset = xoff)
      widget_control, cmbbid, set_value = {combobox_select:(where(long(currentmonth) EQ month0))[0]}
    endif
;-------------year----------------
    yearindex = uniq(yearcal, sort(yearcal))
    currentyear = strtrim(yearcal[yearindex], 1)
    xoff = (34 + 2*vallen[0])*(1-keyword_set(monthly)) + (33 + 3*vallen[0])*(1-keyword_set(yearly))
    cmbbid = cw_combobox_pm(base, UVALUE = {name:'year'}, UNAME = 'year', value = currentyear, xoffset = xoff)
    widget_control, cmbbid, set_value = {combobox_select:(where(long(currentyear) EQ year0))[0]}
;-----------------------------
  ENDELSE
;
  return, base
end