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-% language=uk
-
-\environment interaction-style
-
-\startcomponent interaction-javascript
-
-\startchapter[title={JavaScript}]
-
-Annotations can be controlled with \JAVASCRIPT\ but it really depends on the
-viewer if it works out well. Using these scripts is a multi||step process where
-common functions and data structures can be shared and collected in preambles:
-
-\starttyping
-\startJSpreamble {name}
- MyCounter = 0 ;
-\stopJSpreamble
-\stoptyping
-
-The more action oriented scripts are defined as:
-
-\starttyping
-\startJScode {increment}
- MyCounter = MyCounter + 1 ; // or: ++MyCounter ;
-\stopJScode
-\stoptyping
-
-This script is executed with:
-
-\starttyping
-\goto {advance by one} [JS(increment)]
-\stoptyping
-
-Nicer is to define a function:
-
-\starttyping
-\startJSpreamble {helpers} used now
- function Increment(n) {
- MyCounter = MyCounter + n ;
- }
-\stopJSpreamble
-\stoptyping
-
-and then say:
-
-\starttyping
-\goto {advance by one} [JS(Increment{5})]
-\stoptyping
-
-The distribution contains a collection of scripts that can be preloaded and used
-when needed. You can recognize the files by the \type {java-imp-} prefix. To
-prevent all preambles ending up in the \PDF\ file, we can say:
-
-\starttyping
-\startJSpreamble {something} used later
-\stopJSpreamble
-\stoptyping
-
-We already saw that one can also say \type {used now} and there's also a way
-to filter specific preambles on usage:
-
-\starttyping
-\startJScode {mything} uses {something}
-\stopJScode
-\stoptyping
-
-One should be aware of the fact that there is no decent way to check if every
-script is all right! Even worse, the \JAVASCRIPT\ interpreter currently used in
-the \ACROBAT\ tools is not reentrant, and breaks down on typos
-
-The full repertoire of commands is:
-
-\showsetup{startJScode}
-
-\showsetup{startJSpreamble}
-
-\showsetup{addtoJSpreamble}
-
-\showsetup{setJSpreamble}
-
-As we're into \LUA\ and because \LUA\ is so lightweight I've wondered several
-times now if it would make sense to embed \LUA\ in \PDF\ viewers. After all,
-annotations are an extension mechanism. In the early days of \PDF\ this was
-actually quite doable because \ACROBAT\ reader (and exchange) had a plugin model.
-However, the more functionality ended up in the program, the least interesting
-(and popular) the plugins mechanism became. Some open source viewers have an
-\API\ so in principle adding the lightweight \LUA\ interpreter (of course with
-\LPEG, and quite probably without file \IO) is possible. It has been discussed at
-a recent \CONTEXT\ meeting, so who knows \unknown For now we're stuck with
-\JAVASCRIPT.
-
-An example of \JAVASCRIPT\ usage is the following, where we load a video and add
-some controls. Beware that this kind of functionality is very viewer dependent
-and therefore also very unstable over time. Even worse, if you look at the loaded
-\JAVASCRIPT\ file you will notice a dependency on soon obsolete (in \ACROBAT\ at
-least) shockwave support. First we load a library that will predefine a video
-graphic: and then create an instance:
-
-\starttyping
-\useJSscripts[vplayer]
-
-\setupinteraction
- [state=start]
-
-\externalfigure
- [shockwave]
- [frame=on,
- width=480pt,
- height=270pt,
- file=test.mp4,
- label=foo]
-\stoptyping
-
-The controls are defined with:
-
-\starttyping
-\goto{START} [JS(StartShockwave{foo})]
-\goto{REWIND}[JS(RewindShockwave{foo})]
-\goto{PAUSE} [JS(PauseShockwave{foo})]
-\goto{STOP} [JS(StopShockwave{foo})]
-\stoptyping
-
-or, as we have some defined reference shortcuts:
-
-\starttyping
-\goto{START} [StartShockwave{foo}]
-\goto{REWIND}[RewindShockwave{foo}]
-\goto{PAUSE} [PauseShockwave{foo}]
-\goto{STOP} [StopShockwave{foo}]
-\stoptyping
-
-It's actually not that hard to add all kind of functionality if only we could be
-sure of stable support and continuity.
-
-\stopchapter
-
-\stopcomponent