summaryrefslogtreecommitdiff
path: root/macros/latex/contrib/ocgx2/ocgbase.sty
blob: 8b43adea5392b705e110bb19b7084669e07ce8aa (plain)
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
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% ocgbase.sty
%
% low-level macros for OCG creation, marking optional content and
% for managment of global (document-wide) OCG related lists;
%
% (automatic) OCG configuration in the PDF catalog
%
% Copyright 2015--\today, Alexander Grahn
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Support package for ocgx2.sty, media9.sty, animate.sty
%
% Supported workflows:
%
%   pdflatex, lualatex
%   latex-->dvips-->ps2pdf or Distiller
%   latex-->dvipdfmx
%   xelatex
%
%   for `dvipdfmx', set it as document class option
%
%
% Commands defined:
%
%   \ocgbase_new_ocg:nnn
%   \ocgbase@new@ocg (LaTeX2e version)
%     #1: name (as shown in the Layers Tab of the Reader GUI)
%     #2: usage dict (may be empty), see PDF reference:
%         http://wwwimages.adobe.com/content/dam/Adobe/en/devnet/pdf/pdfs/
%                pdf_reference_1-7.pdf#G9.3858276
%     #3: initial visibility (1|0|true|false|on|off|visible|invisible)
%
%   \ocgbase_last_ocg:
%   \ocgbase@last@ocg (LaTeX2e version)
%     inserts ID of PDF object created during most recent call of
%     \ocgbase_new_ocg:nnn
%
%   --------
%
%   \ocgbase_tree_node_begin:n
%   \ocgbase_tree_node_end:
%   \ocgbase@tree@node@begin (LaTeX2e versions)
%   \ocgbase@tree@node@end
%     #1: OCG PDF object
%     macro pair (begin and end) for inserting OCG object and its children
%     into Order hierarchy (shown as tree structure in the viewers `Layers' tab
%
%   --------
%
%   \ocgbase_add_to_off_list:n
%   \ocgbase@add@to@off@list (LaTeX2e version)
%     #1: PDF object ID of OCG
%     macro for setting initial visibility to `off'
%
%   --------
%
%   \ocgbase_del_from_off_list:n
%   \ocgbase@del@from@off@list (LaTeX2e version)
%     #1: PDF object ID of OCG
%     macro for setting initial visibility to `on'
%
%   --------
%
%   \ocgbase_add_ocg_to_radiobtn_grp:nn
%   \ocgbase@add@ocg@to@radiobtn@grp
%     add OCG #2 (obj ref) to radio button group `#1' (string),
%
%   --------
%
%   \ocgbase_oc_bdc:n
%   \ocgbase@oc@bdc
%     #1: OCG obj ref
%     mark begin of optional content belonging to OCG #1 in the current
%     content stream
%
%   \ocgbase_oc_emc:
%   \ocgbase@oc@emc
%     mark end of optional content in the current content stream
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

% This work may be distributed and/or modified under the
% conditions of the LaTeX Project Public License.
%
% The latest version of this license is in
%   http://mirrors.ctan.org/macros/latex/base/lppl.txt
%
% This work has the LPPL maintenance status `maintained'.
%
% The Current Maintainer of this work is A. Grahn.

\RequirePackage{expl3}
\RequirePackage{l3keys2e}

\def\g@ocgbase@date@tl{2019/11/04}
\def\g@ocgbase@version@tl{0.17}

\ProvidesExplPackage{ocgbase}{\g@ocgbase@date@tl}{\g@ocgbase@version@tl}
{support package for ocgx2.sty}

%package options

%unknown package option error message
\msg_set:nnnn{ocgbase}{unknown~package~option}{Unknown~package~option~`#1'.}{
  Package option~'#1'~is~unknown;\\
  perhaps~it~is~spelled~incorrectly.
}

\keys_define:nn{ocgbase}{
  xetex .code:n = {}, %dummy

  dvipdfmx .choice:,
  dvipdfmx / true .code:n = {\PassOptionsToPackage{dvipdfmx}{pdfbase}},
  dvipdfmx / false .code:n = {},
  dvipdfmx .default:n = {true},

  unknown .code:n = {
    \msg_error:nnx{ocgbase}{unknown~package~option}{\l_keys_key_tl}
  }
}
\ProcessKeysOptions{ocgbase}

\RequirePackage{pdfbase}

\msg_set:nnnn{ocgbase}{support~outdated}{
  Support~package~`#1'~too~old.
}{
  Get~an~up~to~date~version~of~`#1'.\\
  Aborting.
}
\@ifpackagelater{pdfbase}{2017/09/29}{}{
  \msg_error:nnn{ocgbase}{support~outdated}{pdfbase.sty}
  \tex_endinput:D
}

\tl_new:N\g_ocgbase_ocgs_tl %takes ocg object refs
\seq_new:N\g_ocgbase_offocgs_seq

\pbs_at_end_dvi:n{
  \tl_if_empty:NF\g_ocgbase_ocgs_tl{
    %global OCG array
    \pbs_pdfobj:nnn{}{array}{\g_ocgbase_ocgs_tl}
    \tl_set:Nx\l_ocgbase_ocgarray_tl{\pbs_pdflastobj:}
    \tl_new:N\l_ocgbase_offocgentry_tl
    %global OFF list
    \seq_if_empty:NF\g_ocgbase_offocgs_seq{
      \pbs_pdfobj:nnn{}{array}{\seq_use:Nn\g_ocgbase_offocgs_seq{~}}
      \tl_set:Nx\l_ocgbase_offocgentry_tl{/OFF~\pbs_pdflastobj:}
    }
    %global Order list
    \tl_new:N\l_ocgbase_ocgorderentry_tl
    \tl_new:N\l_ocgbase_ocgorder_tl
    \tl_if_exist:cT{g_ocgbase_nd_0_chld_tl}{
      \ocgbase_build_order:Nn\l_ocgbase_ocgorder_tl{
        \tl_use:c{g_ocgbase_nd_0_chld_tl}
      }
    }
    \tl_if_empty:NF\l_ocgbase_ocgorder_tl{
      \pbs_pdfobj:nnn{}{array}{\l_ocgbase_ocgorder_tl}
      \tl_set:Nx\l_ocgbase_ocgorderentry_tl{/Order~\pbs_pdflastobj:}
    }
    %generate RBGroups entry (radio button groups)
    \tl_new:N\l_ocgbase_rbtn_groups_tl
    \seq_map_inline:Nn\g_ocgbase_rbtn_groups_seq{
      \int_compare:nT{\seq_count:c{g_ocgbase_rbtn_group_#1_seq}>\c_one_int}{
        \tl_put_right:Nx\l_ocgbase_rbtn_groups_tl{
          ~[\seq_use:cn{g_ocgbase_rbtn_group_#1_seq}{~}]
        }
      }
    }
    \tl_new:N\l_ocgbase_rbgroupsentry_tl
    \tl_if_empty:NF\l_ocgbase_rbtn_groups_tl{
      \pbs_pdfobj:nnn{}{array}{\l_ocgbase_rbtn_groups_tl}
      \tl_set:Nx\l_ocgbase_rbgroupsentry_tl{/RBGroups~\pbs_pdflastobj:}
    }
    \pbs_pdfcatalog:n{
      /OCProperties~<<
        /OCGs~\l_ocgbase_ocgarray_tl
        /D~<<
          /AS~[
            <</Event/View  /Category[/View]  /OCGs~\l_ocgbase_ocgarray_tl>>
            <</Event/Print /Category[/Print] /OCGs~\l_ocgbase_ocgarray_tl>>
            <</Event/Export/Category[/Export]/OCGs~\l_ocgbase_ocgarray_tl>>
          ]
          /BaseState/ON~\l_ocgbase_offocgentry_tl
          \l_ocgbase_ocgorderentry_tl
          \l_ocgbase_rbgroupsentry_tl
          /ListMode/VisiblePages
        >>
      >>
    }
  }
}

%macro for inserting new OCG object
\cs_new_protected_nopar:Nn\ocgbase_new_ocg:nnn{
  \pbs_pdfobj:nnn{}{dict}{
    /Type/OCG/Name~(#1)~\str_if_eq:eeF{#2}{}{/Usage<<#2>>}
  }
  \tl_gput_right:Nx\g_ocgbase_ocgs_tl{~\pbs_pdflastobj:}
  \bool_if:nT{
    \str_if_eq_p:ee{#3}{0} ||
    \str_if_eq_p:ee{#3}{off} ||
    \str_if_eq_p:ee{#3}{false} ||
    \str_if_eq_p:ee{#3}{invisible}
  }{
    \ocgbase_add_to_off_list:n{\pbs_pdflastobj:}
  }
  \tl_gset:Nx\g_ocgbase_last_ocg_tl{\pbs_pdflastobj:}
}

\cs_new_nopar:Nn\ocgbase_last_ocg:{\g_ocgbase_last_ocg_tl}

\int_new:N\g_ocgbase_nd_int    %node id
\seq_new:N\g_ocgbase_tree_nd_stack_seq    %stack with open ocg node id
\seq_new:N\g_ocgbase_tree_ocg_stack_seq    %stack with open ocg obj number
\seq_gpush:Nn\g_ocgbase_tree_nd_stack_seq{0}    %push root node
\seq_gpush:Nn\g_ocgbase_tree_ocg_stack_seq{null}    %push root node

%macro for starting OCG object (and nested children) insertion into Order
%hierarchy (shown as tree structure in the viewers `Layers' tab
\cs_new_protected:Nn\ocgbase_tree_node_begin:n{ % #1: OCG obj
  %get the parent node from stack
  \seq_get:NN\g_ocgbase_tree_nd_stack_seq\l__ocgbase_prnt_tl
  \tl_if_exist:cTF{g_ocgbase_nd_\l__ocgbase_prnt_tl _chld_tl}{
    %parent has >=1 children (i. e. my older siblings), traverse them
    \tl_set:Nv\l__ocgbase_prev_sbl_tl{g_ocgbase_nd_\l__ocgbase_prnt_tl _chld_tl}
    \tl_set:Nx\l__ocgbase_cur_ocg_tl{#1}
    \ocgbase_traverse_siblings:NN\l__ocgbase_prev_sbl_tl\l__ocgbase_cur_ocg_tl
    \str_if_empty:NTF\l__ocgbase_cur_ocg_tl{
      %I am the first child of my parent to refer to OCG #1
      \int_gincr:N\g_ocgbase_nd_int
      \tl_set:Nx\l__ocgbase_cur_nd_tl{\int_use:N\g_ocgbase_nd_int}
      %set myself as my next-older sibling's `next sibling'
      \tl_gset:cV{
        g_ocgbase_nd_\l__ocgbase_prev_sbl_tl _sbl_tl}\l__ocgbase_cur_nd_tl
    }{
      %there is already a sibling referring to OCG #1; no new node needs be
      %created
      \tl_set:NV\l__ocgbase_cur_nd_tl\l__ocgbase_prev_sbl_tl
    }
  }{
    %I am the very first child of my parent
    \int_gincr:N\g_ocgbase_nd_int
    \tl_set:Nx\l__ocgbase_cur_nd_tl{\int_use:N\g_ocgbase_nd_int}
    %set myself as my parent's first child
    \tl_gset:cV{g_ocgbase_nd_\l__ocgbase_prnt_tl _chld_tl}\l__ocgbase_cur_nd_tl
  }
  %set the OCG I am referring to
  \tl_gset:cx{g_ocgbase_nd_\l__ocgbase_cur_nd_tl _ocg_tl}{#1}
  %push current node and its associated OCG obj on the stacks
  \seq_gpush:NV\g_ocgbase_tree_nd_stack_seq\l__ocgbase_cur_nd_tl
  \seq_gpush:Nx\g_ocgbase_tree_ocg_stack_seq{#1}
}

%macro that ends insertion of OCG and sub-OCGs into Order tree
\cs_new_protected:Nn\ocgbase_tree_node_end:{
  \seq_get:NN\g_ocgbase_tree_nd_stack_seq\l_tempa_tl
  \seq_get:NN\g_ocgbase_tree_ocg_stack_seq\l_tempb_tl
  \str_if_eq:eeT{
    \cs_if_exist_use:c{g_ocgbase_nd_\l_tempa_tl _ocg_tl}
  }{
    \l_tempb_tl
  }{
    \seq_gpop:NN\g_ocgbase_tree_nd_stack_seq\g_trash_tl
    \seq_gpop:NN\g_ocgbase_tree_ocg_stack_seq\g_trash_tl
  }
}

% helper macro (recursive); traverses siblings to find either
% the node which refers to the same OCG (arg #2 remains un-modified), or
% the last sibling inserted (arg #2 is cleared);
% the node id of the sibling found is returned in arg #1
\cs_new:Nn\ocgbase_traverse_siblings:NN{
  % #1: current node (in/out),  #2: OCG obj (in/out)
  \str_if_eq:eeF{#2}{\tl_use:c{g_ocgbase_nd_#1_ocg_tl}}{
    \tl_if_exist:cTF{g_ocgbase_nd_#1_sbl_tl}{
      \tl_set:Nv#1{g_ocgbase_nd_#1_sbl_tl}
      \ocgbase_traverse_siblings:NN#1#2
    }{
      \tl_clear:N#2
    }
  }
}

\cs_new:Nn\ocgbase_build_order:Nn{
  % (recursive macro)
  % #1: tl var to which the OCG order is written (output)
  % #2: starting node id (input; usually `1')
  \tl_set:Nx\l__ocgbase_cur_nd_tl{#2}
  % first, append the OCG obj the current node is referring to
  \tl_put_right:Nx#1{~\tl_use:c{g_ocgbase_nd_\l__ocgbase_cur_nd_tl _ocg_tl}}
  % second, traverse the tree starting with the first child node
  \tl_if_exist:cT{g_ocgbase_nd_\l__ocgbase_cur_nd_tl _chld_tl}{
    \seq_gpush:NV\g_ocgbase_tree_nd_stack_seq\l__ocgbase_cur_nd_tl
    \tl_put_right:Nn#1{~[}
    \ocgbase_build_order:Nn#1{
      \tl_use:c{g_ocgbase_nd_\l__ocgbase_cur_nd_tl _chld_tl}}
    \tl_put_right:Nn#1{~]}
    \seq_gpop:NN\g_ocgbase_tree_nd_stack_seq\l__ocgbase_cur_nd_tl
  }
  % third, traverse the tree starting with the next sibling node
  \tl_if_exist:cT{g_ocgbase_nd_\l__ocgbase_cur_nd_tl _sbl_tl}{
    \ocgbase_build_order:Nn#1{
      \tl_use:c{g_ocgbase_nd_\l__ocgbase_cur_nd_tl _sbl_tl}}
  }
}

%macro for appending an OCG object to the global `OFF' list
%(initial non-visibility)
\cs_new_protected_nopar:Nn\ocgbase_add_to_off_list:n{
  \seq_if_in:NxF\g_ocgbase_offocgs_seq{#1}{
    \seq_gput_right:Nx\g_ocgbase_offocgs_seq{#1}
  }
}

%macro for removing an OCG object from global `OFF' list
%(initial non-visibility)
\cs_new_protected_nopar:Nn\ocgbase_del_from_off_list:n{
  \seq_if_in:NxT\g_ocgbase_offocgs_seq{#1}{
    \ocgbase_seq_gremove_all:Nx\g_ocgbase_offocgs_seq{#1}
  }
}
\cs_set_eq:NN\ocgbase_seq_gremove_all:Nn\seq_gremove_all:Nn
\cs_generate_variant:Nn\ocgbase_seq_gremove_all:Nn{Nx}

\seq_new:N\g_ocgbase_rbtn_groups_seq
\cs_new_protected_nopar:Nn\ocgbase_add_ocg_to_radiobtn_grp:nn{
  % #1: rbtn group name,
  % #2: OCG obj ref
  \seq_if_exist:cF{g_ocgbase_rbtn_group_#1_seq}{
    \seq_new:c{g_ocgbase_rbtn_group_#1_seq}
    \seq_gput_right:Nx\g_ocgbase_rbtn_groups_seq{#1}
  }
  \seq_if_in:cxF{g_ocgbase_rbtn_group_#1_seq}{#2}{
    \seq_gput_right:cx{g_ocgbase_rbtn_group_#1_seq}{#2}
  }
}

% OC-marked content
\cs_new_protected_nopar:Nn\ocgbase_oc_bdc:n{\pbs_pdfbdc:nn{/OC}{#1}}
\cs_new_protected_nopar:Nn\ocgbase_oc_emc:{\pbs_pdfemc:}

%stack of PDF obj references of currently open OCGs
\seq_new:N\g_ocgbase_open_stack_seq
%push OCG to stack
\cs_new_protected_nopar:Nn\ocgbase_open_stack_push:n{
  \seq_gpush:Nx\g_ocgbase_open_stack_seq{#1}}
%pop OCG from stack into tl
\cs_new_protected_nopar:Nn\ocgbase_open_stack_pop:N{
    \seq_gpop:NN\g_ocgbase_open_stack_seq#1}

%l2e versions
\cs_gset_eq:NN\ocgbase@new@ocg\ocgbase_new_ocg:nnn
\cs_gset_eq:NN\ocgbase@last@ocg\ocgbase_last_ocg:
\cs_gset_eq:NN\ocgbase@tree@node@begin\ocgbase_tree_node_begin:n
\cs_gset_eq:NN\ocgbase@tree@node@end\ocgbase_tree_node_end:
\cs_gset_eq:NN\ocgbase@add@to@off@list\ocgbase_add_to_off_list:n
\cs_gset_eq:NN\ocgbase@del@from@off@list\ocgbase_del_from_off_list:n
\cs_gset_eq:NN\ocgbase@add@ocg@to@radiobtn@grp\ocgbase_add_ocg_to_radiobtn_grp:nn
\cs_gset_eq:NN\ocgbase@oc@bdc\ocgbase_oc_bdc:n
\cs_gset_eq:NN\ocgbase@oc@emc\ocgbase_oc_emc:
\cs_gset_eq:NN\ocgbase@open@stack@pop\ocgbase_open_stack_pop:N
\cs_gset_eq:NN\ocgbase@open@stack@push\ocgbase_open_stack_push:n