On Wed, 6 Feb 2013, Troy Henderson wrote:
I would like to make a "row" of a \startalign ... \stopalign "hidden". The
following fails.
\starttext
\definelayer[hiddenlayer][state=stop]
\startformula
\startalign[n=3,align={right,middle,left}]
\NC a \NC = \NC b \NR
\setlayer[hiddenlayer]{\NC a + c \NC = \NC b + c \NR}
\stopalign
\stopformula
\stoptext
Layers would not work for something like this.
I usually use the attached macros for stepping:
\environment steps
\starttext
\StartStepping 2
\startformula
\startalign[n=3,align={right,middle,left}]
\NC a \NC = \NC b \NR
\STEP 2{\NC a + c \NC = \NC b + c \NR}
\stopalign
\stopformula
\StopStepping
\stoptext
Aditya\startmodule steps
\unprotect
% This module defines two macros:
% \ONLY{count}{...} which displays text on a particular page
% \STEP{count}{...} which displays text from a particular page
\def\complexslides_only#1{\csname complexslides_steps_only_#1\endcsname}
\def\complexslides_step#1{\csname complexslides_steps_step_#1\endcsname}
\def\complexslides_hide#1{\csname complexslides_steps_hide_#1\endcsname}
\def\StartStep#1#2\StopStep{\complexslides_step{#1}{#2}}
\def\StartOnly#1#2\StopOnly{\complexslides_only{#1}{#2}}
\def\StartHide#1#2\StopHide{\complexslides_hide{#1}{#2}}
\long\def\gobble#1{}
\long\def\oneofone#1{#1}
\long\def\gobblebox#1%
{\phantom{\framed[align=normal, frame=off]{#1}}}
\long\def\displaybox#1%
{\framed[align=normal, frame=off]{#1}}
% Allow nesting of \StartStepping ... \StopStepping
\def\StartStepping#1#2\StopStepping%
{\dorecurse{30}{\long\setvalue{complexslides_steps_step_\recurselevel}{\gobble}}%
\dorecurse{30}{\long\setvalue{complexslides_steps_only_\recurselevel}{\gobble}}%
\dorecurse{30}{\long\setvalue{complexslides_steps_hide_\recurselevel}{\gobblebox}}%
\pushmacro\ONLY
\pushmacro\STEP
\pushmacro\HIDE
\def\ONLY{\complexslides_only}%
\def\STEP{\complexslides_step}%
\def\HIDE{\complexslides_hide}%
\dorecurse{#1}{%
\edef\currentStepLevel{\recurselevel}%
\long\setvalue{complexslides_steps_step_\currentStepLevel}{\oneofone}%
\long\setvalue{complexslides_steps_only_\currentStepLevel}{\oneofone}%
\long\setvalue{complexslides_steps_hide_\currentStepLevel}{\displaybox}%
#2%
\setvalue{complexslides_steps_only_\currentStepLevel}{\gobble}%
\page\decrementnumber[userpage]}%
\incrementnumber[userpage]%
\popmacro\ONLY
\popmacro\STEP
}
\def\doifStepelse%
{\doifelse\currentStepLevel}
% To be used in a group
\unexpanded\def\disablesteps
{\def\complexslides_only##1{\gobble}% ##2
\def\complexslides_step##1{\oneofone}%##2
}
\unexpanded\def\SetStep#1#2% i of n
{\dorecurse{#2}{\long\setvalue{complexslides_steps_step_\recurselevel}{\gobble}}%
\dorecurse{#2}{\long\setvalue{complexslides_steps_only_\recurselevel}{\gobble}}%
\dorecurse{#2}{\long\setvalue{complexslides_steps_hide_\recurselevel}{\gobblebox}}%
\edef\currentStepLevel{#1}%
\long\setvalue{complexslides_steps_step_\currentStepLevel}{\oneofone}%
\long\setvalue{complexslides_steps_only_\currentStepLevel}{\oneofone}%
\long\setvalue{complexslides_steps_hide_\currentStepLevel}{\displaybox}%
}
\def\hidecomponent#1
{\let\StartS\StartStepping
\let\StopS\StopStepping
\def\StartStepping{\grabbufferdata[Stepping][StartStepping][StopStepping]}
\component[#1]
\let\StartStepping\StartS
\let\StopStepping\StopS}
\protect
\stopmodule
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