File: fsc_fileselect.pro

package info (click to toggle)
coyote 2019.01.29-1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster
  • size: 6,316 kB
  • sloc: python: 184; makefile: 14; sh: 13
file content (1193 lines) | stat: -rw-r--r-- 48,914 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
;+
; NAME:
;   FSC_FILESELECT
;
; PURPOSE:
;
;   The purpose of this compound widget is to provide a means
;   by which the user can type or select a file name. The
;   program is written as an "object widget", meaning that
;   the guts of the program is an object of class FSC_FILESELECT.
;   This is meant to be an example of the obvious advantages of
;   writing compound widget programs as objects.
;
; AUTHOR:
;
;   FANNING SOFTWARE CONSULTING
;   David Fanning, Ph.D.
;   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/
;
; CATEGORY:
;
;   General programming.
;
; CALLING SEQUENCE:
;
;   filenameID = FSC_FileSelect(parent)
;
; INPUT PARAMETERS:
;
;   parent -- The parent widget ID of the compound widget. Required.
;
; INPUT KEYWORDS:
;
;   Event_Pro -- The event handler procedure for this compound widget.By default: "".
;   Event_Func -- The event handler function for this compound widget. By default: "".
;
;      If neither EVENT_PRO or EVENT_FUNC is defined, program events are handled internally by the compound widget.
;
;   DirectoryName -- The initial name of the directory. By defaut: current directory.
;   Filename -- The initial file name in the filename text widget.
;   Filter -- The file filter. By default: "*".
;   Frame -- Set this keyword for a frame around the compound widget.
;   LabelFont -- The font for the label widget. By default: "".
;   LabelName -- The text on the label widgt. By default: "Filename: ".
;   LabelSize -- The X screen size of the label widget. By default: 0.
;   MustExist -- A flag that indicates selected files must exist. By default: 0.
;   NoMaxSize -- A flag to prohibit automatic text widget sizing. By default: 0.
;
;     If this keyword is not set, the compound widget will automatically resize itself to
;     the largest widget in its parent base widget. It will do this by changing the size of
;     the text widgets holding the file and directory names.
;
;   Read -- Set this keyword to have file selection for reading a file. By default: 1.
;   SelectDirectory -- The default directory for file selection. In other words, this is the
;     default directory for DIALOG_PICKFILE, which is accessed via the BROWSE buttons.
;   SelectFont -- The font for the "Browse" button. By default: "".
;   SelectTitle -- The title bar text on the file selection dialog. By default: "Select a File...".
;   TextFont -- The font for the filename text widget. By default: "".
;   UValue -- User value for any purpose.
;   Write -- Set this keyword to open a file for writing. By default: 0.
;   XSize -- The X size of the text widget holding the filename. By default: StrLen(filename) * 1.5 > 40.
;
; OUTPUT KEYWORDS:
;
;   ObjectRef -- Assign this keyword to an output variable that will hold the internal object reference.
;                With the object reference you can call object methods to easily change many properties of
;                the compound widget.
;
; COMMON BLOCKS:
;
;   None.
;
; EVENT STRUCTURE:
;
;   All events are handled internally unless either the Event_Pro or Event_Func
;   keywords are used to assign an event handler to the compound widget. All events
;   generated by the text widgets are passed to the assigned event handler.
;
;   event = { CW_FILESELECT, $     ; The name of the event structure.
;             ID: 0L, $            ; The ID of the compound widget's top-level base.
;             TOP: 0L, $           ; The widget ID of the top-level base of the hierarchy.
;             HANDLER: 0L, $       ; The event handler ID. Filled out by IDL.
;             Basename: "", $      ; The base filename without directory specifiers.
;             Filename: "", $      ; The fully qualified filename.
;             Directory: "", $     ; The name of the current file directory.
;           }
;
; EXAMPLE:
;
;   An example program is provided at the end of the FSC_FILESELECT code. To run it,
;   type these commands:
;
;      IDL> .Compile fsc_fileselect
;      IDL> Example
;
;   Or, if you want to obtain the object reference, type this:
;
;      IDL> Example, theObject
;
;   Now you can call the object's methods. For example:
;
;      IDL theObject->SetProperty, XSize=150
;
; GETTING and SETTING VALUES:
;
;   So as not to disrupt the accepted paradigm in using compound widgets, you
;   can use the return value of the FSC_FILESELECT function with WIDGET_CONTROL to
;   get and set the "value" of the widget.
;
;       Widget_Control, filenameID, Set_Value='C:\RSI\IDL52\DATA\cyclone.dat'
;
;   The program will automatically separate the file name portion of the value
;   from the directory portion and put things in the correct text widgets.
;
;   Similarly, you can get the "value" of the widget:
;
;       Widget_Control, filenameID, Get_Value=theValue
;       Print, theValue
;
;           C:\RSI\IDL52\DATA\cyclone.dat
;
;   The return value is the fully qualified file path to the file.
;
; USING OBJECT METHODS to CHANGE PROGRAM PROPERTIES:
;
;   If you obtain the object reference, you have a great deal more control
;   over the properties of the compound widget. You obtain the object reference
;   by calling the function like this:
;
;      filenameID = FSC_FILESELECT(parent, ObjectRef=theObject)
;
; OBJECT PROCEDURE METHODS:
;
;   GetProperty -- This method allows various properties of the widget to be
;       returned via output keywords. The keywords that are available are:
;
;      DirectoryName -- The current directory.
;      Event_Func -- The name of the event handler function for this compound widget.
;      Event_Pro -- The name of the event handler procedure for this compound widget.
;      Filename -- The current base filename.
;      Filter -- The current file filter.
;      LabelName -- The text on the label widget.
;      LabelSize -- The X screen size of the label widget.
;      MustExist -- A flag that indicates selected files must exist to be selected.
;      Parent -- The parent widget of the compound widget.
;      Read=read -- The file selection for reading flag.
;      SelectTitle -- The title bar text on the file selection dialog.
;      TLB -- The top-level base of the compound widget.
;      UValue -- The user value of the compound widget.
;      Write -- The file selection for writing flag.
;      XSize -- The X size of the text widget holding the filename.
;
;   LabelSize -- This method makes sure that the directory name and file name labels
;      are the same size. Normally, this procedure is called internally. No parameters.
;
;   MatchSize -- This method resizes the compound widget so that it is as long as the
;      the longest widget in the parent base widget. This is done automatically upon
;      realization unless the NOMAXSIZE keyword is set. The method aids in writing
;      resizeable widget programs.
;
;   SetProperty -- This method allows various properties of the widget to be
;       set via input keywords. The keywords that are available are:
;
;      DirectoryName -- The current directory.
;      Event_Func -- The name of the event handler function for this compound widget.
;      Event_Pro -- The name of the event handler procedure for this compound widget.
;      Filename -- The current base filename.
;      Filter -- The current file filter.
;      LabelName -- The text on the label widget.
;      LabelSize -- The X screen size of the label widget.
;      MustExist -- A flag that indicates selected files must exist to be selected.
;      Read -- The file selection for reading flag.
;      SelectTitle -- The title bar text on the file selection dialog.
;      UValue -- The user value of the compound widget.
;      Write -- The file selection for writing flag.
;      XSize -- The X size of the text widget holding the filename.
;
;   TextSelect - Allows you to create a selection in filename text widget. See the
;                documentation for the SET_TEXT_SELECT keyword to Widget_Control.
;
;      selection -- A two-element array containing the starting position and selection length.
;
; OBJECT FUNCTION METHODS:
;
;      GetFileName -- Returns the fully qualified filename. No parameters.
;
;      GetTLB -- Returns the top-level base ID of the compound widget. No Parameters.
;
;      Inspect_DirectoryName -- Inspects the directory name for correctness. Requires one positional parameter.
;
;        directoryName -- The name of the directory from the directory text widget.
;        textSelection -- The current text selection position.
;
;        At the moment all this does is remove any blank characters from either
;        end of the directory name and makes sure the last character of the directory
;        name does not end in a subdirectory specifier (except for VMS).
;
;     Inspect_Filename -- Inspects the file name for correctness. Requires one positional parameter.
;
;        filename -- The name of the file from the filename text widget.
;        textSelection -- The current text selection position.
;
;        At the moment all this does is remove any blank characters from either
;        end of the file name
;
; MODIFICATION HISTORY:
;
;   Written by: David W. Fanning, 21 NOV 1999.
;   Fixed bug in File Name selection button. 18 MAR 2000. DWF.
;   Fixed an error in which directory the Browse buttons should start
;       searching. 29 SEP 2000. DWF.
;   Previously returned events only for typing in text widgets. Now
;       Browse button events are also returned. 29 SEP 2000. DWF.
;   Fixed a bug in setting the file filter. 29 SEP 2000. DWF.
;   Removed the Directory Browse button 10 AUG 2002. DWF.
;   Added cgErrorMsg to error handling. 10 AUG 2002. DWF.
;   Changed the ability to specify a file filter as a string array, instead
;       of just as a scalar string. This required the use of a pointer, which
;       meant that I had to remove the FILTER field from the CW_FILESELECT
;       event structure to avoid likely memory leakage. This is a dangerous
;       change because it means programs that relied on this (I expect there
;       are very, very few) will break and it goes against my philosopy of
;       keeping my programs backward compatible. Let me know if you have
;       problems. In testing, I discoved no problems in my own code. 31 OCT 2002. DWF.
;   Fixed a problem with DIALOG_PICKFILE that sometimes allowed users to change
;       directories without selecting a file. 3 Nov 2002. DWF.
;   Fixed a problem with widget resizing with the help of Bob Portman that had plagued
;       me from the beginning. Thanks, Bob! 5 August 2003. DWF
;   Added TEXTSELECT method. 5 Aug 2003. DWF.
;   Had to add FORWARD_FUNCTION statement to get error handler compiled when using
;       DIRECTORY keyword. 24 Nov 2003. DWF.
;   Fixed a problem with too many events going to an event handler specified with
;       the EVENT_PRO or EVENT_FUNC keyword from the text widget. Now only Carriage
;       Return events are passed on to the user-specified event handler. 8 July 2004. DWF.
;   Replace all "\" characters with "/" characters in directory names. 8 Januay 2006. DWF.
;   Set the default fonts to be the current widget font, rather than the default widget font. 4 Oct 2008. DWF.
;-
;
;******************************************************************************************;
;  Copyright (c) 2008, 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.                            ;
;******************************************************************************************;
FUNCTION FSC_Fileselect_WidgetFont, DEFAULT=default

   ; Build a small widget to determine the current 
   ; and default widget fonts.
   
   base = Widget_Base(MAP=0)
   button = Widget_Button(base, Value='TEST')
   
   ; Checking before realization gives default font.
   defaultFont = Widget_Info(button, /FONTNAME)
   
   ; Checking after realization gives current font.
   Widget_Control, base, /REALIZE
   currentFont = Widget_Info(button, /FONTNAME)
   
   ; Clean up.
   Widget_Control, base, /DESTROY

   IF Keyword_Set(default) THEN $
        RETURN, defaultFont ELSE $
        RETURN, currentFont
    
END ;-----------------------------------------------------------------------------------------------------------------------------



PRO FSC_FileSelect::Directory_Events, event

; This method handles any typing in the directory name text widget.

Catch, theError
IF theError NE 0 THEN BEGIN
   ok = cgErrorMsg(/Traceback)
   RETURN
ENDIF

   ; Don't deal with selection events.

IF event.type EQ 3 THEN RETURN

   ; Inspect the directory name and set it.

Widget_Control, self.dirtextID, Get_Value=dirname
dirname = dirname[0]
textSelection = Widget_Info(self.dirtextID, /Text_Select)
dirname = self->Inspect_DirectoryName(dirname, textSelection[0])
; See notes in INIT method.
;;;dirname = StrJoin( StrSplit(dirname, '\\', /Regex, /Extract, /Preserve_Null), '/')

self.directoryname = dirname
END ;-----------------------------------------------------------------------------------------------------------------------------



PRO FSC_FileSelect::Filename_Events, event

; This method handles any typing in the file name text widget.

Catch, theError
IF theError NE 0 THEN BEGIN
   ok = cgErrorMsg(/Traceback)
   RETURN
ENDIF

   ; Don't deal with selection events.

IF event.type EQ 3 THEN RETURN

   ; Inspect the file name and set it.

Widget_Control, self.filetextID, Get_Value=filename
filename = filename[0]
textSelection = Widget_Info(self.filetextID, /Text_Select)
filename = self->Inspect_Filename(filename, textSelection[0])
; See notes in INIT method.
;;;filename = StrJoin( StrSplit(filename, '\\', /Regex, /Extract, /Preserve_Null), '/')
self.filename = filename
END ;-----------------------------------------------------------------------------------------------------------------------------



FUNCTION FSC_FileSelect::GetFilename

; This method returns the fully-qualified filename. Checks to be
; sure the last character in the directory name is not a directory
; specifier.

Catch, theError
IF theError NE 0 THEN BEGIN
   ok = cgErrorMsg()
   RETURN, -1
ENDIF

   ; Get the correct directory separator.

CASE StrUpCase(!Version.OS_Family) OF
   'MACOS'   : sep = ':'    ; Macintoshes
   'VMS'     : sep = ']'    ; VMS machines
   ELSE      : sep = '/'    ; Unix machines
ENDCASE

IF StrUpCase(!Version.OS_Family) NE "VMS" THEN BEGIN
   length = StrLen(self.directoryName)
   WHILE StrMid(self.directoryName, length-1, 1) EQ sep DO BEGIN
      self.directoryName = StrMid(self.directoryName, 0, length-1)
      Widget_Control, self.dirTextID, Set_Value=self.directoryName
      length = StrLen(self.directoryName)
   ENDWHILE
ENDIF

filename = Filepath(Root_Dir=self.directoryName, self.filename)
; See notes in INIT method.
;;filename = StrJoin( StrSplit(filename, '\\', /Regex, /Extract, /Preserve_Null), '/')
RETURN, filename
END ;-------------------------------------------------------------------------------



FUNCTION FSC_FileSelect::GetNoMaxSize
RETURN, self.nomaxsize
END ;-----------------------------------------------------------------------------------------------------------------------------



PRO FSC_FileSelect::GetProperty, $
   DirectoryName=dirname, $        ; The current directory.
   Event_Func=event_func, $        ; The name of the event handler function for this compound widget.
   Event_Pro=event_pro, $          ; The name of the event handler procedure for this compound widget.
   Filename=filename, $            ; The current filename.
   Filter=filter, $                ; The current file filter.
   LabelName=labelname, $          ; The text on the label widget.
   LabelSize=labelsize, $          ; The X screen size of the label widget.
   MustExist=mustexist, $          ; A flag that indicates selected files must exist to be selected.
   Parent=parent, $                ; The parent widget of the compound widget.
   Read=read, $                    ; The file selection for reading flag.
   SelectTitle=selecttitle, $      ; The title bar text on the file selection dialog.
   TLB=tlb, $                      ; The top-level base of the compound widget.
   UValue=uvalue, $                ; The user value of the compound widget.
   Write=write, $                  ; The file selection for writing flag.
   XSize=xsize                     ; The X size of the text widget holding the filename.

Catch, theError
IF theError NE 0 THEN BEGIN
   ok = cgErrorMsg()
   RETURN
ENDIF

dirname = self.directoryname
event_pro = self.event_pro
event_func = self.event_func
filename = self.filename
filter = *self.filter
labelname = self.labelname
labelsize = self.labelsize
mustexist = self.mustexist
parent=self.parent
read = self.read
selecttitle = self.selecttitle
tlb = self.tlb
uvalue = *self.uvalue
wirte = self.write
xsize = self.xsize

END ;-----------------------------------------------------------------------------------------------------------------------------



FUNCTION FSC_FileSelect::GetTLB
RETURN, self.tlb
END ;-----------------------------------------------------------------------------------------------------------------------------



FUNCTION FSC_FileSelect::Inspect_DirectoryName, dirname, textSelection

; This method removes leading and trailing blank characters
; in the directory name.

Catch, theError
IF theError NE 0 THEN BEGIN
   ok = cgErrorMsg()
   RETURN, -1
ENDIF

thisDir = StrTrim(dirname, 2)
IF StrLen(thisDir) NE StrLen(dirname) THEN $
   textSelection = textSelection-( StrLen(dirname) - StrLen(thisDir) )
Widget_Control, Set_Value=thisDir, self.dirtextID, Set_Text_Select=[textSelection, 0]
RETURN, thisDir
END ;-----------------------------------------------------------------------------------------------------------------------------



FUNCTION FSC_FileSelect::Inspect_Filename, filename, textSelection

; This method removes leading and trailing blank characters
; in the filename.

Catch, theError
IF theError NE 0 THEN BEGIN
   Catch, /Cancel
   ok = cgErrorMsg()
   RETURN, -1
ENDIF

thisFile = StrTrim(filename, 2)
IF StrLen(thisFile) NE StrLen(filename) THEN $
   textSelection = textSelection-( StrLen(filename) - StrLen(thisFile) )
Widget_Control, Set_Value=thisFile, self.filetextID, Set_Text_Select=[textSelection, 0]
RETURN, thisFile
END ;-----------------------------------------------------------------------------------------------------------------------------



PRO FSC_FileSelect::LabelSize

; This method ensures the directory and filename labels are the same size.

Catch, theError
IF theError NE 0 THEN BEGIN
   ok = cgErrorMsg()
   RETURN
ENDIF

fgeo = Widget_Info(self.filelabelID, /Geometry)
dgeo = Widget_Info(self.dirlabelID, /Geometry)
bestSize = fgeo.scr_xsize > dgeo.scr_xsize
Widget_Control, self.fileLabelID, Scr_XSize=bestSize
Widget_Control, self.dirLabelID, Scr_XSize=bestSize
END ;-------------------------------------------------------------------------------



PRO FSC_FileSelect::MatchSize

; This method makes the compound widget the same size as the largest
; widget in the parent base widget. It does this by adjusting
; the text widget sizes.

Catch, theError
IF theError NE 0 THEN BEGIN
   ok = cgErrorMsg()
   RETURN
ENDIF

   ; Get the geometries of the filename widgets.

tgeo = Widget_Info(self.tlb, /Geometry)
fgeo = Widget_Info(self.filetextID, /Geometry)
bbgeo = Widget_Info(self.filebaseID, /Geometry)
lbgeo = Widget_Info(Widget_Info(self.dirbaseID, /Parent), /Geometry)
rbgeo = Widget_Info(Widget_Info(self.filebrowseID, /Parent), /Geometry)

   ; Add the bits and bobs together.

fspacing = tgeo.space
fpadding = 2*tgeo.xpad + 2*lbgeo.xpad
ffixedsize = ( bbgeo.scr_xsize - 2*bbgeo.margin - (fgeo.scr_xsize) + $
               rbgeo.scr_xsize - 2*rbgeo.margin )

   ; Get the geometries of the directory name widgets.

fgeo = Widget_Info(self.dirtextID, /Geometry)
bbgeo = Widget_Info(self.dirbaseID, /Geometry)

   ; Add the bits and bobs together.

dspacing = tgeo.space
dpadding = 2*tgeo.xpad + 2*lbgeo.xpad
dfixedsize = ( bbgeo.scr_xsize - 2*bbgeo.margin - (fgeo.scr_xsize) + $
               rbgeo.scr_xsize - 2*rbgeo.margin )

   ; Go find all the children and find the biggest one of them.

thisSize = 0
childID = Widget_Info(self.parent, /Child)
geom = Widget_Info(childID, /Geometry)
testSize = geom.scr_xsize - 2*geom.margin
thisSize = thisSize > testSize
WHILE childID NE 0 DO BEGIN
   childID = Widget_Info(childID, /Sibling)
   IF childID GT 0 THEN BEGIN
      geom = Widget_Info(childID, /Geometry)
      testSize = geom.scr_xsize - 2*geom.margin
      thisSize = thisSize > testSize
   ENDIF
ENDWHILE

   ; Resize the widgets

ftextsize = thisSize - (fspacing + fpadding + ffixedsize)
Widget_Control, self.filetextID, Scr_XSize=ftextsize

dtextsize = thisSize - (dspacing + dpadding + dfixedsize)
Widget_Control, self.dirtextID, Scr_XSize=dtextsize

END ;-------------------------------------------------------------------------------



FUNCTION FSC_FileSelect_RStrPos, Expr, SubStr, Pos

  ON_ERROR, 2
  N = N_PARAMS()
  if (n lt 2) then message, 'Incorrect number of arguments.'

  ; Is expr an array or a scalar? In either case, make a result
  ; that matches.
  if (size(expr, /n_dimensions) eq 0) then result = 0 $
  else result = make_array(dimension=size(expr,/dimensions), /INT)

  RSubStr = STRING(REVERSE(BYTE(SubStr))) ; Reverse the substring

  for i = 0, n_elements(expr) - 1 do begin
    Len = STRLEN(Expr[i])
    IF (N_ELEMENTS(Pos) EQ 0) THEN Start=0 ELSE Start = Len - Pos

    RString = STRING(REVERSE(BYTE(Expr[i]))) ; Reverse the string

    SubPos = STRPOS(RString, RSubStr, Start)
    IF SubPos NE -1 THEN SubPos = Len - SubPos - STRLEN(SubStr)
    result[i] = SubPos
  endfor

  RETURN, result
END ;-------------------------------------------------------------------------



PRO FSC_FileSelect::Select_File, event

Catch, theError
IF theError NE 0 THEN BEGIN
   ok = cgErrorMsg()
   RETURN
ENDIF

; Use the file selection dialog to obtain a filename.

currentFilename = self.filename
self.filename = ""
filename = Dialog_Pickfile( File=currentFilename, $
                            Filter=*self.filter, $
                            Path=self.directoryname, $
                            Get_Path=thePath, $
                            Must_Exist=self.mustexist, $
                            Read=self.read, $
                            Title=self.selecttitle, $
                            Write=self.write )
                            
IF filename EQ "" THEN BEGIN
   self.filename = currentFilename
   RETURN
ENDIF

   ; Remove the directory from the name.

index = StrLen(thePath)
theFilename = StrMid(filename, index)

   ; Strip the last directory separator.

length = StrLen(thePath)
thePath = StrMid(thePath, 0, length-1)

   ; Inspect the file name to make sure it is valid.

textSelection = Widget_Info(self.filetextID, /Text_Select)
filename = self->Inspect_Filename(filename, textSelection[0])

   ; Update the display.

self->SetProperty, Filename=theFilename, DirectoryName=thePath

END ;-----------------------------------------------------------------------------------------------------------------------------



PRO FSC_FileSelect::SetFilename, theName

; This method separates the filename into directory and filename
; and adds them to the interface.

Catch, theError
IF theError NE 0 THEN BEGIN
   ok = cgErrorMsg()
   RETURN
ENDIF

; Change back slashes to forward slashes.
;;theName = StrJoin( StrSplit(theName, '\\', /Regex, /Extract, /Preserve_Null), '/')

   ; Get the correct directory separator.

CASE StrUpCase(!Version.OS_Family) OF
   'MACOS'   : sep = ':'    ; Macintoshes
   'VMS'     : sep = ']'    ; VMS machines
   ELSE      : sep = '/'    ; Unix machines
ENDCASE

index = FSC_FileSelect_RStrPos(theName, sep)
IF index EQ -1 THEN BEGIN
   self->SetProperty, Filename=theName
   self.filename = theName
ENDIF ELSE BEGIN
   directoryName = StrMid(theName, 0, index)
   filename = StrMid(theName, index+1)
   self->SetProperty, Filename=filename, Directory=directoryName
   self.filename = filename
   self.directoryName = directoryName
ENDELSE
END ;-------------------------------------------------------------------------------



PRO FSC_FileSelect::SetProperty, $
   DirectoryName=dirname, $        ; The initial name of the directory. By defaut: current directory.
   Event_Func=event_func, $        ; The event handler function for this compound widget.
   Event_Pro=event_pro, $          ; The event handler procedure for this compound widget.
   Filename=filename, $            ; The initial file name in the filename text widget.
   Filter=filter, $                ; The file filter.
   LabelName=labelname, $          ; The text on the label widgt.
   LabelSize=labelsize, $          ; The X screen size of the label widget.
   MustExist=mustexist, $          ; A flag that indicates selected files must exist.
   Read=read, $                    ; Set this keyword to have file selection for reading a file.
   SelectTitle=selecttitle, $      ; The title bar text on the file selection dialog.
   UValue=uvalue, $                ; User value for any purpose.
   Write=write, $                  ; Set this keyword to open a file for writing.
   XSize=xsize                     ; The X size of the text widget holding the filename.

Catch, theError
IF theError NE 0 THEN BEGIN
   ok = cgErrorMsg()
   RETURN
ENDIF

IF N_Elements(dirname) NE 0 THEN BEGIN
   ;;dirname = StrJoin( StrSplit(dirname, '\\', /Regex, /Extract, /Preserve_Null), '/')
   self.directoryname = dirname
   Widget_Control, self.dirtextID, Set_Value=dirname
ENDIF

IF N_Elements(event_pro) NE 0 THEN BEGIN
   self.event_pro = event_pro
   Widget_Control, self.tlb, Event_Pro=event_pro
ENDIF

IF N_Elements(event_func) NE 0 THEN BEGIN
   self.event_func = event_func
   Widget_Control, self.tlb, Event_Func=event_func
ENDIF

IF N_Elements(filename) NE 0 THEN BEGIN
   self.filename = filename
   strlength = StrLen(filename)
   Widget_Control, self.filetextID, Set_Value=filename
ENDIF

IF N_Elements(labelname) NE 0 THEN BEGIN
   self.labelname = labelname
   Widget_Control, self.filelabelID, Set_Value=labelname
ENDIF

IF N_Elements(labelsize) NE 0 THEN BEGIN
   Widget_Control, self.filelabelID, Scr_XSize=labelsize
ENDIF

IF N_Elements(filter) NE 0 THEN *self.filter = filter
IF N_Elements(mustexist) NE 0 THEN self.mustexist = mustexist
IF N_Elements(read) NE 0 THEN self.read = read
IF N_Elements(selecttitle) NE 0 THEN self.selecttitle = selecttitle
IF N_Elements(uvalue) NE 0 THEN *self.uvalue = uvalue
IF N_Elements(write) NE 0 THEN self.write = write

IF N_Elements(xsize) NE 0 THEN BEGIN
   Widget_Control, self.filetextID, XSize=xsize
   Widget_Control, self.dirtextID, XSize=xsize
ENDIF

END ;-----------------------------------------------------------------------------------------------------------------------------



PRO FSC_FileSelect::TextSelect, selection

Catch, theError
IF theError NE 0 THEN BEGIN
   ok = cgErrorMsg()
   RETURN
ENDIF

IF N_Elements(selection) NE 2 THEN Message, 'Text selection array is not a two-element array: [beginSelection, selectionLength]'
Widget_Control, self.fileTextID, Set_Text_Select=selection

END ;-----------------------------------------------------------------------------------------------------------------------------



PRO FSC_FileSelect::CLEANUP
Ptr_Free, self.uvalue
Ptr_Free, self.filter
END ;-----------------------------------------------------------------------------------------------------------------------------



FUNCTION FSC_FileSelect::INIT, $
   parent, $                       ; The parent widget ID of the compound widget.
   DirectoryName=dirname, $        ; The initial name of the directory. By defaut: current directory.
   Event_Pro=event_pro, $          ; The event handler procedure for this compound widget.By default: "".
   Event_Func=event_func, $        ; The event handler function for this compound widget. By default: "".
   Filename=filename, $            ; The initial file name in the filename text widget.
   Filter=filter, $                ; The file filter. By default: "*".
   Frame=frame, $                  ; Set this keyword for a frame around the compound widget.
   LabelFont=labelfont, $          ; The font for the label widget. By default: "".
   LabelName=labelname, $          ; The text on the label widgt. By default: "Filename: ".
   LabelSize=labelsize, $          ; The X screen size of the label widget. By default: 0.
   MustExist=mustexist, $          ; A flag that indicates selected files must exist. By default: 0.
   NoMaxSize=nomaxsize, $          ; A flag to prohibit automatica text widget sizing. By default: 0.
   Read=read, $                    ; Set this keyword to have file selection for reading a file. By default: 1.
   Scr_XSize=scr_xsize, $          ; The X screen size of the compound widget. By default: 0
   SelectFont=selectfont, $        ; The font for the "Browse" button. By default: "".
   Selectdir=selectdir, $          ; The inital directory for file and directory selections.
   SelectTitle=selecttitle, $      ; The title bar text on the file selection dialog. By default: "Select a File...".
   TextFont=textfont, $            ; The font for the filename text widget. By default: "".
   UValue=uvalue, $                ; User value for any purpose.
   Write=write, $                  ; Set this keyword to open a file for writing. By default: 0.
   XSize=xsize                     ; The X size of the text widget holding the filename. By default: StrLen(filename) * 1.5 > 40.

Catch, theError
;theError = 0
IF theError NE 0 THEN BEGIN
   Catch, /Cancel
   ok = cgErrorMsg()
   RETURN, 0
ENDIF

   ; Populate self object.

self.parent = parent
self.directoryname = dirname
self.event_pro = event_pro
self.event_func = event_func
self.filename = filename
self.filter = Ptr_New(filter)
self.frame = frame
self.labelfont = labelfont
self.labelname = labelname
self.labelsize = labelsize
self.mustexist = mustexist
self.nomaxsize = nomaxsize
self.read = read
self.selectdir = selectdir
self.selectfont = selectfont
self.selecttitle = selecttitle
self.textfont = textfont
self.uvalue = Ptr_New(uvalue)
self.write = write
self.xsize = xsize


   ; Build widgets.

self.tlb = Widget_Base( self.parent, $
                        Event_Func = self.event_func, $
                        Event_Pro = self.event_pro, $
                        Frame = self.frame, $
                        Func_Get_Value='FSC_FileSelect_Get_Value', $
                        Pro_Set_Value='FSC_FileSelect_Set_Value', $
                        Row = 1, $
                        Base_Align_Center=1, $
                        UValue=*self.uvalue )

   ; Put the self object in the first child of the TLB.

leftbase = Widget_Base(self.tlb, Row=2, UValue=self)

self.dirbaseID = Widget_Base(leftbase, Row=1)

self.dirlabelID = Widget_Label( self.dirbaseID, $
                             Font=self.labelfont, $
                             Scr_XSize=self.labelsize, $
                             Value='Directory: ' )


self.dirtextID = Widget_Text( self.dirbaseID, $
                           All_Events=1, $
                           Editable=1, $
                           Event_Func='FSC_FileSelect_Event_Handler', $
                           Font=self.textfont, $
                           UValue={method:'Directory_Events', object:self}, $
                           Value=self.directoryname, $
                           XSize=self.xsize, $
                           YSize=1 )


self.filebaseID = Widget_Base(leftbase, Row=1)

self.filelabelID = Widget_Label( self.filebaseID, $
                             Font=self.labelfont, $
                             Kill_Notify='FSC_FileSelect_Kill_Notify', $
                             Notify_Realize='FSC_FileSelect_Notify_Realize', $
                             Scr_XSize=self.labelsize, $
                             UValue=self, $
                             Value=self.labelname )


self.filetextID = Widget_Text( self.filebaseID, $
                           All_Events=1, $
                           Editable=1, $
                           Event_Func='FSC_FileSelect_Event_Handler', $
                           Font=self.textfont, $
                           UValue={method:'Filename_Events', object:self}, $
                           Value=self.filename, $
                           XSize=self.xsize, $
                           YSize=1 )

rightbase = Widget_Base(self.tlb, Row=1, Base_Align_Center=1)
self.filebrowseID = Widget_Button( rightbase, $
                               Event_Func='FSC_FileSelect_Event_Handler', $
                               UValue={method:'Select_File', object:self}, $
                               Value='Browse')


RETURN, 1
END ;-----------------------------------------------------------------------------------------------------------------------------



PRO FSC_FileSelect__Define

   objectClass = { FSC_FileSelect, $      ; The object class FSC_FILESELECT.
                   parent: 0L, $          ; The ID of the parent widget.
                   tlb: 0L, $             ; The ID of the top-level base widget for the compound widget.
                   filebaseID: 0L, $      ; The ID of the filename base widget.
                   dirbaseID: 0L, $       ; The ID of the directory base widget.
                   filelabelID: 0L, $     ; The ID of the filename label widget.
                   dirlabelID: 0L, $      ; The ID of the directory label widget.
                   filetextID: 0L, $      ; The ID of the filename text widget.
                   dirtextID: 0L, $       ; The ID of the directory text widget.
                   filebrowseID: 0L, $    ; The ID of the file browse button widget.
                   dirbrowseID: 0L, $     ; Unused currently. Left here for compatibility reasons..
                   event_pro: "", $       ; The user-defined name of the event procedure for the widget.
                   event_func: "", $      ; The user-defined name of the event function for the widget.
                   filename: "", $        ; The current contents of the filename text widget.
                   directoryname: "", $   ; The current contents of the directory text widget.
                   frame: 0L, $           ; A flag to indicate a frame around the compound widget.
                   filter: Ptr_New(), $   ; The current file filter used in file selection.
                   labelfont: "", $       ; The font for the label widgets.
                   labelname: "", $       ; The VALUE of the file name label widget.
                   labelsize: 0L, $       ; The X screen size fo the label widgets.
                   mustexist: 0L, $       ; If this field is 1, the user can only select files that exist.
                   nomaxsize: 0L, $       ; This widget sizes itself to the largest widget in the base, unless this is set.
                   read: 0L, $            ; Set this keyword to select a file for reading.
                   selectdir: "", $       ; The inital directory used for file selection.
                   selectfont: "", $      ; The font used for the Browse buttons.
                   selecttitle: "", $     ; The text on the Dialog_Pickfile widget.
                   textfont: "", $        ; The font used in the text widgets.
                   uvalue: Ptr_New(), $   ; The user's user value. Unused by the program.
                   write: 0L, $           ; Set this keyword to select a file for writing.
                   xsize: 0L $            ; The X size of the text widgets.
                 }

END ;-----------------------------------------------------------------------------------------------------------------------------



PRO FSC_FileSelect_Set_Value, id, filename

; This function sets the filename of the widget, using the
; traditional "Widget_Control, fieldID, Set_Value=filename" syntax.
; The directory will be stripped off the filename, if required.

firstChild = Widget_Info(id, /Child)
Widget_Control, firstChild, Get_UValue=self
self->SetFilename,filename
END ;-----------------------------------------------------------------------------------------------------------------------------



FUNCTION FSC_FileSelect_Get_Value, id

; This function returns the filename of the widget, using the
; traditional "Widget_Control, fieldID, Get_Value=filename" syntax.

firstChild = Widget_Info(id, /Child)
Widget_Control, firstChild, Get_UValue=self
RETURN, self->GetFilename()
END ;-----------------------------------------------------------------------------------------------------------------------------



PRO CW_FileSelect__Define

; The event structure definition. This is the event structure returned by the compound widget.

   eventStructure = { CW_FileSelect, $     ; The name of the event structure.
                      ID: 0L,  $           ; The ID of the top-level base of the compound widget.
                      TOP: 0L, $           ; The ID of the top-level base.
                      HANDLER: 0L, $       ; The ID of the event handler widget.
                      Filename: "", $      ; The fully qualified file name.
                      Basename: "", $      ; The base file name without directory attached.
                      Directory: "" }      ; The file directory.
END ;-----------------------------------------------------------------------------------------------------------------------------



FUNCTION FSC_FileSelect_Event_Handler, event

; The main event handler for the compound widget. It reacts
; to "messages" in the UValues of widgets that generate events.
; The messages indicate which object method to call. A message
; consists of an object method and the self object reference.

Widget_Control, event.ID, Get_UValue=theMessage

Call_Method, theMessage.method, theMessage.object, event

   ; Events will be sent only if there is an assigned event handler.

self = theMessage.object
self->GetProperty, Filename=filename, DirectoryName=directory, $
   Event_Pro=event_pro, Event_Func=event_func
IF event_pro NE "" OR event_func NE "" THEN BEGIN

    pseudoevent = {CW_FileSelect, self->GetTLB(), event.top, 0L, $
      Filepath(Root_Dir=directory, filename),  filename, directory}

    ; Don't return events from text widgets, unless the user has typed
    ; a cariage return.
    eventName = Tag_Names(event, /Structure_Name)
    IF eventName NE "" THEN BEGIN

       IF StrMid(eventName, 0, 11) EQ 'WIDGET_TEXT' THEN BEGIN
          IF (eventName EQ 'WIDGET_TEXT_CH') THEN BEGIN
            IF (event.ch EQ 10) THEN RETURN, pseudoevent ELSE RETURN, 0
          ENDIF ELSE RETURN, 0
       ENDIF
    ENDIF
    RETURN, pseudoevent
ENDIF ELSE RETURN, 0
END ;-----------------------------------------------------------------------------------------------------------------------------


PRO FSC_FileSelect_Notify_Realize, labelID

; When the compound widget is realized, make sure sizes are correct.

Widget_Control, labelID, Get_UValue=self
IF self->GetNoMaxSize() THEN RETURN
self->Matchsize
END ;-----------------------------------------------------------------------------------------------------------------------------



PRO FSC_FileSelect_Kill_Notify, labelID

; When the compound widget dies, destroy the self object.

Widget_Control, labelID, Get_UValue=self
Obj_Destroy, self
END ;-----------------------------------------------------------------------------------------------------------------------------



FUNCTION FSC_FileSelect, $
   parent, $                       ; The parent widget ID of the compound widget.
   Event_Pro=event_pro, $          ; The event handler procedure for this compound widget.By default: "".
   Event_Func=event_func, $        ; The event handler function for this compound widget. By default: "".
   DirectoryName=dirname, $        ; The initial name of the directory. By defaut: current directory.
   Filename=filename, $            ; The initial file name in the filename text widget.
   Filter=filter, $                ; The file filter. By default: "*".
   Frame=frame, $                  ; Set this keyword for a frame around the compound widget.
   LabelFont=labelfont, $          ; The font for the label widget. By default: "".
   LabelName=labelname, $          ; The text on the label widgt. By default: "Filename: ".
   LabelSize=labelsize, $          ; The X screen size of the label widget. By default: 0.
   MustExist=mustexist, $          ; A flag that indicates selected files must exist. By default: 0.
   NoMaxSize=nomaxsize, $          ; A flag to prohibit automatica text widget sizing. By default: 0.
   ObjectRef=objectref, $          ; An output keyword containing the object reference.
   Read=read, $                    ; Set this keyword to have file selection for reading a file. By default: 1.
   SelectDirectory=selectdir, $    ; The default directory for file selection.
   SelectFont=selectfont, $        ; The font for the "Browse" button. By default: "".
   SelectTitle=selecttitle, $      ; The title bar text on the file selection dialog. By default: "Select a File...".
   TextFont=textfont, $            ; The font for the filename text widget. By default: "".
   UValue=uvalue, $                ; User value for any purpose.
   Write=write, $                  ; Set this keyword to open a file for writing. By default: 0.
   XSize=xsize                     ; The X size of the text widget holding the filename. By default: StrLen(filename) * 1.5 > 40.

Catch, theError
;theError = 0
IF theError NE 0 THEN BEGIN
   ok = cgErrorMsg()
   RETURN, 0
ENDIF

   ; Need a parent parameter.

IF N_Elements(parent) EQ 0 THEN BEGIN
   ok = Dialog_Message('FSC_FILESELECT: A parent parameter is required.')
   RETURN, -1
ENDIF

   ; Check keyword arguments.

IF N_Elements(dirname) EQ 0 THEN CD, Current=dirname

; 4 Oct 2008. I don't know why this line is here, but it prevents Windows
; computers from starting Dialog_Pickfile in the correct directory, since it
; thinks the directory is not "formatted correctly". This is used throughout
; the code, so I have just commented all the instances out, rather than remove
; them. Search for "StrJoin".
;dirname = StrJoin( StrSplit(dirname, '\\', /Regex, /Extract, /Preserve_Null), '/')
IF N_Elements(event_pro) EQ 0 THEN event_pro = ""
IF N_Elements(event_func) EQ 0 THEN event_func = ""
IF N_Elements(filename) EQ 0 THEN filename = ""
IF N_Elements(filter) EQ 0 THEN filter = '*'
IF N_Elements(Frame) EQ 0 THEN Frame = 0
IF N_Elements(labelfont) EQ 0 THEN labelfont = FSC_Fileselect_WidgetFont()
IF N_Elements(labelname) EQ 0 THEN labelname = "Filename: "
IF N_Elements(labelsize) EQ 0 THEN labelsize = 0
IF N_Elements(mustexist) EQ 0 THEN mustexist = 0
IF N_Elements(nomaxsize) EQ 0 THEN nomaxsize = 0
IF N_Elements(read) EQ 0 THEN read = 0
IF N_Elements(selectdir) EQ 0 THEN selectdir = dirname
IF N_Elements(selectfont) EQ 0 THEN selectfont = FSC_Fileselect_WidgetFont()
IF Keyword_Set(read) EQ 0 AND Keyword_Set(write) EQ 0 AND $
   N_Elements(selecttitle) EQ 0 THEN selecttitle = "Select a File..." ELSE selecttitle = ""
IF N_Elements(textfont) EQ 0 THEN textfont = FSC_Fileselect_WidgetFont()
IF N_Elements(uvalue) EQ 0 THEN uvalue = ""
IF N_Elements(write) EQ 0 THEN write = 0
IF N_Elements(xsize) EQ 0 THEN xsize = Long(StrLen(dirname) * 1.20 > 40)

   ; Create the underlying structure.

objectref = Obj_New('FSC_FileSelect', $
   parent, $
   DirectoryName=dirname, $
   Event_Pro=event_pro, $
   Event_Func=event_func, $
   Filename=filename, $
   Filter=filter, $
   Frame=frame, $
   LabelFont=labelfont, $
   LabelName=labelname, $
   LabelSize=labelsize, $
   MustExist=mustexist, $
   NoMaxSize=nomaxsize, $
   Read=read, $
   Scr_XSize=scr_xsize, $
   SelectFont=selectfont, $
   SelectTitle=selecttitle, $
   Selectdir=selectdir, $
   TextFont=textfont, $
   UValue=uvalue, $
   Write=write, $
   XSize=xsize )

   ; Return the ID of the top-level base of the compound widget.

  RETURN, objectref->GetTLB()
END ;-----------------------------------------------------------------------------------------------------------------------------



PRO Example_Set_Size, event
Widget_Control, event.top, Get_UValue=theObject
theObject->MatchSize
END ;-----------------------------------------------------------------------------------------------------------------------------



PRO Example_Set_Filter, event
Widget_Control, event.top, Get_UValue=theObject
theObject->SetProperty, Filter='*.pro', Filename='cyclone.pro'
END ;-----------------------------------------------------------------------------------------------------------------------------



PRO Example_Set_Filename, event
Widget_Control, event.top, Get_UValue=theObject
filename = Filepath(Subdir=['examples', 'data'], 'worldelv.dat')
theObject->SetFilename, filename
END ;-----------------------------------------------------------------------------------------------------------------------------



PRO Example_Shrink, event
Widget_Control, event.top, Get_UValue=theObject
theObject->SetProperty, XSize=40
END ;-----------------------------------------------------------------------------------------------------------------------------



PRO Example_Print_Filename, event
Widget_Control, event.top, Get_UValue=theObject
Print, theObject->GetFilename()
END ;-----------------------------------------------------------------------------------------------------------------------------



PRO Example_Quit, event
Widget_Control, event.top, /Destroy
END ;-----------------------------------------------------------------------------------------------------------------------------



PRO Example, theObject

tlb = Widget_Base(Title='Exercise FSC_FILESELECT...', Column=1)
button = Widget_Button(tlb, Value='Make Compound Widget As Big As Me', $
   Event_Pro='Example_Set_Size', Scr_XSize=500)
button = Widget_Button(tlb, Value='Set Filename to worldelv.data in Data Directory', $
   Event_Pro='Example_Set_Filename')
button = Widget_Button(tlb, Value='Print Filename', $
   Event_Pro='Example_Print_Filename')
button = Widget_Button(tlb, Value="Shrink the Text Fields", $
   Event_Pro='Example_Shrink')
CD, Current=thisDir
filenameID = FSC_FileSelect(tlb, Directory=thisDir, Filename='fileselect.pro', $
   /NoMaxSize, ObjectRef=theObject)
button = Widget_Button(tlb, Value='Quit', Event_Pro='Example_Quit')
Widget_Control, tlb, /Realize, Set_UValue=theObject
XManager, 'example', tlb, /No_Block
END ;-----------------------------------------------------------------------------------------------------------------------------