;+
;Procedure:
;  spd_ui_message
;
;Purpose:
;  Output messages to the history window, status bar, and/or dialog message pop-up.
; 
;Calling sequence:
;  spd_ui_message, message [,sb=sb] [,hw=hw] [,dialog=dialog]
; 
;Inputs:
;  message: output message string
;  sb: GUI status bar object reference (optional)
;  hw: GUI history window object reference (optional) 
;  dialog: flag to pop-up dialog message (optional) 
; 
;Notes: 
;  _extra can be used to pass keywords to:
;     -history window
;     -dialog_message
;
;$LastChangedBy: aaflores $
;$LastChangedDate: 2014-02-14 12:17:24 -0800 (Fri, 14 Feb 2014) $
;$LastChangedRevision: 14382 $
;$URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/tags/spedas_3_00/spedas_gui/utilities/spd_ui_message.pro $
;-
pro spd_ui_message, message, sb=sb, hw=hw, dialog=dialog, $
                    _extra=_extra

    compile_opt idl2, hidden

  msg = string(message)

  ;output to the status bar
  if keyword_set(sb) && obj_valid(sb) && obj_isa(sb,'SPD_UI_MESSAGE_BAR') then begin
    sb->update, msg
  endif
  
  ;output to the history window
  if keyword_set(hw) && obj_valid(hw) && obj_isa(hw, 'SPD_UI_HISTORY')then begin
    tb = scope_traceback(/struct)
    prefix = tb[n_elements(tb)-2].routine + ': '
    hw->update, prefix + msg, _extra=_extra
  endif
  
  ;output to dialog message
  if keyword_set(dialog) then begin
    response=dialog_message(msg, /center, _extra=_extra)
  endif

  return

end ;---------------------------------------------