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1%D \module
2%D   [      file=s-present-stepwise, % was s-pre-60
3%D        version=2004.03.15,
4%D          title=\CONTEXT\ Style File,
5%D       subtitle=Presentation Environment Stepwise,
6%D         author=Hans Hagen,
7%D           date=\currentdate,
8%D      copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
9%C
10%C This module is part of the \CONTEXT\ macro||package and is
11%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
12%C details.
13
14% use lua instead of global mess
15
16\startmodule[present-stepwise]
17
18\unprotect
19
20\startmode[paper,print]
21    \let\StartSteps\relax
22    \let\StopSteps \relax
23    \let\FlushStep \relax
24    \let\ResetStep \relax
25    \let\StartBusy \relax
26    \let\StopBusy  \relax
27    \endinput
28\stopmode
29
30\newcount\c_module_pre_steps_current
31\newcount\c_module_pre_steps_maximum
32\newcount\c_module_pre_steps_nesting_step
33\newcount\c_module_pre_steps_nesting_steps
34\newcount\c_module_pre_steps_nesting_busy
35
36\def\StepCounter   {\the\c_module_pre_steps_current}
37\def\StepMaximum   {\the\c_module_pre_steps_maximum}
38\def\StepLayer     {step:\the\c_module_pre_steps_current}
39\def\NextStepLayer {step:\the\numexpr\c_module_pre_steps_current+\plusone\relax}
40\def\FirstStepLayer{step:1}
41
42\useJSscripts[stp]
43
44\startsetups[set-stepper]
45
46    \ifnum\getvariable{stepper}{nofsteps}>\c_module_pre_steps_maximum
47
48        \dostepwiserecurse {\numexpr\c_module_pre_steps_maximum+\plusone\relax} {\getvariable{stepper}{nofsteps}} {1} {
49            \doifnotmode{nosteps,nostep} {
50                \expanded{\defineviewerlayer[step:\recurselevel][state=stop,scope=global]}
51            }
52        }
53
54        \global\c_module_pre_steps_maximum\getvariable{stepper}{nofsteps}\relax
55
56    \fi
57
58\stopsetups
59
\setvariables
61  [stepper]
62  [set=\setups{set-stepper},
63   nofsteps=50]
64
65\defineviewerlayer[step:busy][state=start]
66
67\definereference [SetupStepper]  [JS(SetupStepper{step,\StepMaximum})]
68\definereference [ResetStepper]  [JS(ResetStepper)]
69\definereference [CheckStepper]  [JS(CheckStepper{\StepCounter})]
70\definereference [InvokeStepper] [JS(InvokeStepper)]
71
72% todo: roll back blank
73
74\unexpanded\def\ResetStep
75  {\iftrialtypesetting\else
76     \global\c_module_pre_steps_current\zerocount
77   \fi}
78
79\unexpanded\def\NextStep
80  {\iftrialtypesetting\else
81     \global\advance\c_module_pre_steps_current\plusone
82   \fi}
83
84\unexpanded\def\PrevStep
85  {\iftrialtypesetting\else
86     \global\advance\c_module_pre_steps_current\minusone
87   \fi}
88
89\unexpanded\def\FlushStep
90  {\iftrialtypesetting\else
91     \StopStep
92     \NextStep
93     \StartStep
94   \fi}
95
96\unexpanded\def\StartStep
97  {\iftrialtypesetting\else
98     \global\advance\c_module_pre_steps_nesting_step\plusone
99     \ifcase\c_module_pre_steps_nesting_step\or
100       \startviewerlayer[\StepLayer]%
101     \fi
102   \fi
103   \ignorespaces}
104
105\unexpanded\def\StopStep
106  {\removeunwantedspaces
107   \iftrialtypesetting\else
108     \ifcase\c_module_pre_steps_nesting_step\or
109       \stopviewerlayer
110     \fi
111     \global\advance\c_module_pre_steps_nesting_step\minusone
112   \fi}
113
114\unexpanded\def\StartSteps
115  {\iftrialtypesetting\else
116     \global\advance\c_module_pre_steps_nesting_steps\plusone
117     \ifcase\c_module_pre_steps_nesting_steps\or
118       \ResetStep
119       \NextStep
120       \StartStep
121     \fi
122   \fi}
123
124\unexpanded\def\StopSteps
125  {\iftrialtypesetting\else
126     \ifcase\c_module_pre_steps_nesting_steps\or
127       \StopStep
128       \PrevStep
129     \fi
130     \global\advance\c_module_pre_steps_nesting_steps\minusone
131   \fi}
132
133\unexpanded\def\StartBusy
134  {\iftrialtypesetting\else
135     \global\advance\c_module_pre_steps_nesting_busy\plusone
136     \ifcase\c_module_pre_steps_nesting_busy\or
137       \startviewerlayer[step:busy]
138     \fi
139   \fi
140   \ignorespaces}
141
142\unexpanded\def\StopBusy
143  {\removeunwantedspaces
144   \iftrialtypesetting\else
145     \ifcase\c_module_pre_steps_nesting_busy\or
146       \stopviewerlayer
147     \fi
148     \global\advance\c_module_pre_steps_nesting_busy\minusone
149   \fi}
150
151%D Handy:
152
153\unexpanded\def\StartLocalSteps
154  {\ResetStep}
155
156\unexpanded\def\StopLocalSteps
157  {}
158
159\unexpanded\def\StartLocalStep
160  {\NextStep
161   \StartStep}
162
163\unexpanded\def\StopLocalStep
164  {\StopStep}
165
166\appendtoks
167    \ResetStep
168\to \everyaftershipout
169
170\setupinteraction
171  [%openaction=SetupStepper,
172   closeaction=ResetStepper,
173   openpageaction=CheckStepper,
174   closepageaction=ResetStepper]
175
176\defineoverlay[invoke][\overlaybutton{InvokeStepper}]
177
178\setupbackgrounds
179  [text]
180  [background=invoke]
181
182% bonus
183
184\useMPlibrary[nav]
185
186\definepalet
187  [navplus]
188  [attach=interactioncolor,
189   comment=interactioncolor]
190
191\setupcomment
192  [symbol={comment-normal,comment-down},
193   textlayer=\StepLayer,
194   option=buffer,
195   height=\textheight,
196   width=\textwidth,
197   margin=0pt]
198
199\setupattachments
200  [symbol={attach-normal,attach-down},
201   textlayer=\StepLayer]
202
203%D used as (given some definitions):
204%D
205%D \starttyping
206%D \StartLocalSteps
207%D     \startcombination[both]
208%D         {\StartLocalStep\placestreamlayer[left]\StopLocalStep}  {}
209%D         {\StartLocalStep\placestreamlayer[right]\StopLocalStep} {}
210%D     \stopcombination
211%D \StopLocalSteps
212%D \stoptyping
213
214\protect
215
216\stopmodule
217