; docformat = 'rst'
;
; NAME:
;   MaxWindowSize
;
; PURPOSE:
;   Returns the resolution of the largest unobstructed graphics window that can be
;   created on this particular graphics device. Works properly for Windows and UNIX
;   computers, excluding Macintosh computers. There is no known way to find the resolution
;   of the largest unobstructed graphics window on a Macintosh computer, so a fudge factor
;   of 22 pixels is used to account for the Macintosh "dock".
;
;******************************************************************************************;
;                                                                                          ;
;  Copyright (c) 2010, by Fanning Software Consulting, Inc. All rights reserved.           ;
;                                                                                          ;
;  Redistribution and use in source and binary forms, with or without                      ;
;  modification, are permitted provided that the following conditions are met:             ;
;                                                                                          ;
;      * Redistributions of source code must retain the above copyright                    ;
;        notice, this list of conditions and the following disclaimer.                     ;
;      * Redistributions in binary form must reproduce the above copyright                 ;
;        notice, this list of conditions and the following disclaimer in the               ;
;        documentation and/or other materials provided with the distribution.              ;
;      * Neither the name of Fanning Software Consulting, Inc. nor the names of its        ;
;        contributors may be used to endorse or promote products derived from this         ;
;        software without specific prior written permission.                               ;
;                                                                                          ;
;  THIS SOFTWARE IS PROVIDED BY FANNING SOFTWARE CONSULTING, INC. ''AS IS'' AND ANY        ;
;  EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES    ;
;  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT     ;
;  SHALL FANNING SOFTWARE CONSULTING, INC. BE LIABLE FOR ANY DIRECT, INDIRECT,             ;
;  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED    ;
;  TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;         ;
;  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND             ;
;  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT              ;
;  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS           ;
;  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.                            ;
;******************************************************************************************;
;
;+
; :Description:
;    Returns the resolution of the largest unobstructed graphics window that can be
;    created on this particular graphics device. Works properly for Windows and UNIX
;    computers, excluding Macintosh computers. There is no known way to find the resolution
;    of the largest unobstructed graphics window on a Macintosh computer, so a fudge factor
;    of 22 pixels is used to account for the Macintosh "dock".
;
; :Categories:
;    Utility
;    
; :Params:
;    none:
;       
; :Keywords:
;     monitor_resolution: out, optional, type=long
;        Set this keyword to a named variable to return the resolution of the
;        primary display monitor.
;
; :Examples:
;    To create a window of maximum size::
;       maxsize = MaxWindowSize()
;       Window, XSize=maxsize[0], YSize=maxsize[1], /Free
;
; :Author:
;       FANNING SOFTWARE CONSULTING::
;           David W. Fanning 
;           1645 Sheely Drive
;           Fort Collins, CO 80526 USA
;           Phone: 970-221-0438
;           E-mail: david@idlcoyote.com
;           Coyote's Guide to IDL Programming: http://www.idlcoyote.com
;
; :History:
;     Change History::
;        Written, 26 October 2010. DWF.
;        Misunderstood Macintosh result. Now Mac treated like UNIX. 27 Oct 2010. DWF.
;        No known method for Macintosh computers. Resorting to a fudge factor
;           of 22 pixels to account for the Macintosh dock. 27 Oct 2010. DWF.
;        Code is total reversed for UNIX and Macintosh computers! Fixed. 16 Dec 2011. DWF.
;        Modified to only use IDLsysMonitorInfo for IDL 6.3 and higher. 23 Feb 2012. DWF.
;
; :Copyright:
;     Copyright (c) 2010, Fanning Software Consulting, Inc.
;-
FUNCTION MaxWindowSize, MONITOR_RESOLUTION=monitor_resolution

    Compile_Opt idl2
    
    ; Error handling.
    Catch, theError
    IF theError NE 0 THEN BEGIN
        Catch, /CANCEL
        void = cgErrorMsg()
        RETURN, [-1,-1]
    ENDIF
    
    ; Macintosh fudge factor. Should be the size of the dock.
    ; Adjust as necessary.
    macfudge = 22
    
    ; Need monitor resolution?
    IF Arg_Present(monitor_resolution) THEN BEGIN
        Device, Get_Screen_Size=monitor_resolution
    ENDIF
    
    ; Different ways to obtain information based on Windows and UNIX computers.
    CASE StrUpCase(!Version.OS_Family) OF
    
        'WINDOWS': BEGIN 
        
            IF Float(!Version.Release GE 6.3) THEN BEGIN
                oMonInfo = Obj_New('IDLsysMonitorInfo')
                rects = oMonInfo -> GetRectangles(Exclude_Taskbar=1)
                primaryIndex = oMonInfo -> GetPrimaryMonitorIndex()
                Obj_Destroy, oMonInfo
                retValue = rects[[2, 3], primaryIndex]
            ENDIF ELSE BEGIN
                retvalue = Get_Screen_Size()
            ENDELSE
            
            END
            
        'UNIX': BEGIN
        
            IF StrPos(!Version.OS_Name, 'Mac')  GE 0 THEN BEGIN
        
                 ; Macintosh computers. Have to use fudge factor. 
                 ; No way to determine otherwise.
                 s = Get_Screen_Size()
                 retValue = [s[0], s[1] - macfudge]
                
            ENDIF ELSE BEGIN 
                
                ; Unavoidable screen flash here. Uughh! UNIX.
                s = Get_Screen_Size()
                Window, XSIZE=s[0], YSIZE=s[1], /FREE
                retValue = [!D.X_Size, !D.Y_Size]
                WDelete, !D.Window
            
            ENDELSE
                
            END
        
    ENDCASE
    
    ; Return answer.
    RETURN, retValue
 
 END