Changes

Probably for your [[Presentations|slides]], probably for some [[Animation|animation]] or for whatever reason you may want it: you can hide some content from the document, while leaving exactly the same amount of space as that content would need if typeset in the usual way. This is done by placing  On the [[http://archive.contextgarden.net/thread/20050707.223338.a9169811.html mailing list]] Hans suggested many different ways (astonishing easy to use) to hide the content on in a PDF document. Sadly, most of them are viewer-dependent. <table style="border:1px solid #DDDDDD; width:100%" align="left" valign="top"> <tr style="background-color:#DDDDDD" align="left" valign="top"><th> method </th><th> principle </th><th> PROS </th><th> CONS </th></tr> <tr><td><texcode>\defineproperty[my-secrets][layer that ][state=top]\startproperty[my-secrets]My public secret.\stopproperty</texcode></td><td>* makes (invisible) layer on top (JS-based)</td><td>* completely hides everything</td><td>* works with newer Adobe Acrobat/Viewer, in most other browsers the content is not normally visible hidden* I managed to freeze Acrobat 6.0 pro when trying to save the text</td></tr> <tr align="left" valign="top" style="background-color:#EEEEEE;"><td><texcode>\defineproperty[my-hasitations][layer][state=stop] \startproperty[my-hasitations]To \ConTeXt\ or not to \ConTeXt?\stopproperty \button{Show Decision}[VideLayer{my-hasitations}]\button{Hide Decision}[HideLayer{my-hasitations}]\button{Toggle Decision}[ToggleLayer{my-hasitations}]</texcode></td> <td>* makes (invisible) layer, which can be switched on and off (JS-based)</td> <td>* you can switch the content on and off* when hidden, it is completely hidden (as above)</td><td>* (same as above)* even some new Acrobat versions can't handle the buttons</td></tr> <tr><td><texcode>\startproperty[hidden]My secret hidden for Adam's apple ;)\stopproperty</texcode></td><td>* makes transparent fonts</td><td>* no JavaScript* pretty safe for different viewers</td><td>* only text is hidden, but not images, rules, ...</td></tr> <tr align="left" valign="top" style="background-color:#EEEEEE;"><td>[[Hiding Content#The plain TeX way|the plain TeX way]]</td><td>* puts a blank box instead of its content (letter)</td><td>* <b>absolutely no</b> content in the document , not even hidden (only blank space)</td><td>* only works for letters and whitespace, no macros, no figures, ...</td></tr></table> x == The plain TeX way == This example was adapted from the TeXBOOK. However, it can only handle usual text. Forget about macros, forget about graphics ... I hope and still believe that it is possible to extend this macro to make it work in general case. This would also be a preferred solution as it doesn't depend on the viewer's JavaScript <i>in</i>capabilities. <texcode>%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% the portion of code adapted from the TeXBOOK, Excercise 11.5 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% \def\dolist{\afterassignment\dodolist\let\next= }\def\dodolist{\ifx\next\endlist\let\next\relax \else \\\let\next\dolist \fi\next}\def\endlist{\endlist} \def\\{\if\space\next\ % assume that \next is unexpandable\else\setbox0=\hbox{\next}\setbox1=\hbox{}% \dp1=\dp0\ht1=\ht0\wd1=\wd0\box1\fi} \def\demobox#1{{\dolist#1\endlist}} </texcode> <context> \def\dolist{\afterassignment\dodolist\let\next= }\def\dodolist{\ifx\next\endlist\let\next\relax \else \\\let\next\dolist \fi\next}\def\endlist{\endlist} \def\\{\if\space\next\ % assume that \next is displayedunexpandable\else\setbox0=\hbox{\next}\setbox1=\hbox{}% \dp1=\dp0\ht1=\ht0\wd1=\wd0\box1\fi} \def\demobox#1{{\dolist#1\endlist}} Please write something more interesting on this place\demobox{if you are visiting this page and getting bored.}Thanks. Please write something more interesting on this placeif you are visiting this page and getting bored.Thanks. </context> == Layer: state=top ==

== Layer: state=stop == == Transparent fonts == == Final Remarks == * <b>Just as a hint</b>: Don't ever think about hiding your secrets or solutions to the problems for your students that way!<br>

[[http* kerning://archive.contextgarden.net/thread/20050707.223338.a9169811.html]]could cause micro differences in the exact placemet of the (hidden) content