256 lines
10 KiB
Text
256 lines
10 KiB
Text
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% framed.sty v 0.8a 21-Jul-2003
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% Copyright (C) 1992-2003 by Donald Arseneau
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% These macros may be freely transmitted, reproduced, or modified
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% provided that this notice is left intact.
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%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% Create framed or shaded regions that can break across pages using
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% \begin{framed} ... \end{framed} -- ordinary frame box (box at margin)
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% \begin{shaded} ... \end{shaded} -- shaded background (into margin)
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% ... leftbar ... -- line on left side
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% \begin{MakeFramed}{settings} ... \end{MakeFramed}
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% -- generic frame (for new environments)
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%
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% The "framed" environment puts the text into "\fbox" with the
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% settings "\fboxrule=\FrameRule" and "\fboxsep=\FrameSep".
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% You can change these lengths (using "\setlength") and you
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% can even change the definition of "\FrameCommand" to use
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% much fancier boxes.
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%
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% In fact, the "shaded" environment just redefines "\FrameCommand"
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% to use "\colorbox{shadecolor}" (and you have to define the
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% color "shadecolor": \newcolor{shadecolor}...).
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%
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% A page break is allowed, and even encouraged, before the framed
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% environment. If you want to attach some text (a box title) to the
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% frame, then the text should be inserted by \FrameCommand
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%
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% The contents of the framed regions are restricted:
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% Floats, footnotes, marginpars and head-line entries will be lost.
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% (Some of these may be handled in a later version.)
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% This package will not work with the page breaking of multicol.sty,
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% or other systems that perform column-balancing.
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%
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% The MakeFramed environment does the work. Its "settings" argument
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% should contain any adjustments to the text width (applied to \hsize,
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% and using the "\width" of the frame itself) as well as a `restore'
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% command -- \@parboxrestore or \FrameRestore or something similar.
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%
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% Expert commands:
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% \MakeFramed, \endMakeFramed: the "MakeFramed" environment
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% \FrameCommand: command to draw the frame around its argument
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% \FrameRestore: restore some text settings, but fewer than \@parboxrestore
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% \FrameRule: length register; \fboxrule for default "framed".
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% \FrameSep: length register; \fboxsep for default "framed".
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% \FrameHeightAdjust: macro; height of frame above baseline at top of page
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%
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% This is still a `pre-production' version because I can think of many
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% features/improvements that should be made. Nevertheless, starting
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% with version 0.5 it should be bug-free.
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%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\ProvidesPackage{framed}[2003/07/21 v 0.8a:
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framed or shaded text with page breaks]
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\newenvironment{framed}% using default \FrameCommand
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{\MakeFramed {\advance\hsize-\width \FrameRestore}}%
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{\endMakeFramed}
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\newenvironment{shaded}{%
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\def\FrameCommand{\colorbox{shadecolor}}%
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\MakeFramed {\FrameRestore}}%
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{\endMakeFramed}
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\newenvironment{leftbar}{%
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\def\FrameCommand{\vrule width 3pt \hspace{10pt}}%
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\MakeFramed {\advance\hsize-\width \FrameRestore}}%
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{\endMakeFramed}
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\chardef\FrameRestore=\catcode`\| % for debug
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\catcode`\|=\catcode`\% % (debug: insert space after backslash)
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\def\MakeFramed#1{\par
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% measure added width and height; call result \width and \height
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\setbox\z@\vbox{\vskip-1in \hbox{\hskip-1in
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\FrameCommand{\hbox{\vrule \@height .7in \@depth.3in \@width 1in}}}%
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\vskip\z@skip}%
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\def\width{\wd\z@}\def\height{\ht\z@}%
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\edef\fb@frw{\the\width}\edef\fb@frh{\the\height}%
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% insert pre-penalties and skips
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\begingroup
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\skip@\lastskip
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\if@nobreak\else
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\penalty9999 % updates \page parameters
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\ifdim\pagefilstretch=\z@ \ifdim\pagefillstretch=\z@
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\edef\@tempa{\the\skip@}%
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\ifx\@tempa\zero@glue \penalty-30
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\else \vskip-\skip@ \penalty-30 \vskip\skip@
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\fi\fi\fi
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\penalty\z@
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% Give a stretchy breakpoint that will always be taken in preference
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% to the \penalty 9999 used to update page parameters. The cube root
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% of 10000/100 indicates a multiplier of 0.21545, but the maximum
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% calculated badness is really 8192, not 10000, so the multiplier
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% is 0.2301.
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\advance\skip@ \z@ plus-.5\baselineskip
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\advance\skip@ \z@ plus-.231\height
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\advance\skip@ \z@ plus-.231\skip@
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\advance\skip@ \z@ plus-.231\topsep
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\vskip-\skip@ \penalty 1800 \vskip\skip@
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\fi
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\addvspace{\topsep}%
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\endgroup
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% clear out pending page break
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\penalty\@M \vskip 2\baselineskip \vskip\height
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\penalty9999 \vskip -2\baselineskip \vskip-\height
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\penalty9999 % updates \pagetotal
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|\message{After clearout, \pagetotal=\the\pagetotal, \pagegoal=\the\pagegoal. }%
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\fb@adjheight
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\setbox\@tempboxa\vbox\bgroup
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#1% Modifications to \hsize (can use \width and \height)
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\textwidth\hsize \columnwidth\hsize
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}
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\def\endMakeFramed{\par
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\kern\z@ \penalty-100 % put depth into height
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\egroup
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\begingroup \put@frame \endgroup
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}
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% \put@frame takes the contents of \@tempboxa and puts all, or a piece,
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% of it on the page with a frame (\FrameCommand). It recurses until
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% all of \@tempboxa has been used up. (\@tempboxa must have zero depth.)
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\def\put@frame{\relax
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\ifdim\pagegoal=\maxdimen \pagegoal\vsize \fi
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| \message{=============== Entering putframe ====================^^J
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| \pagegoal=\the\pagegoal, \pagetotal=\the\pagetotal. }%
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\ifinner \else
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\dimen@\pagegoal \advance\dimen@-\pagetotal % natural space left on page
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\ifdim\dimen@<2\baselineskip
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| \message{Page has only \the\dimen@\space room left; eject. }%
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\eject \fb@adjheight \put@frame
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\else % there's appreciable room left on the page
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| \message{\string\pagetotal=\the\pagetotal,
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| \string\pagegoal=\the\pagegoal,
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| \string\pagestretch=\the\pagestretch,
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| \string\pageshrink=\the\pageshrink,
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| \string\fb@frh=\fb@frh. \space}
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| \message{Box of size \the\ht\@tempboxa\space + \fb@frh}%
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\begingroup % temporarily set \dimen@ to be...
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\advance\dimen@.8\pageshrink % maximum space available on page
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\advance\dimen@-\fb@frh\relax % space available for frame's contents
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\expandafter\endgroup
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% restore \dimen@ to real room left on page
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\ifdim\dimen@>\ht\@tempboxa % whole box does fit
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| \message{fits in \the\dimen@. }%
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\else % box must be split
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| \message{must be split to fit in \the\dimen@. }%
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\setbox\@tempboxa\vbox{% simulate frame and flexiblity of the page:
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\vskip \fb@frh \@plus\pagestretch \@minus.8\pageshrink
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\kern137sp\kern-137sp\penalty-30
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\unvbox\@tempboxa}%
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\edef\fb@resto@set{\boxmaxdepth\the\boxmaxdepth \splittopskip\the\splittopskip}%
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\boxmaxdepth\z@ \splittopskip\z@
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\setbox\tw@\vsplit\@tempboxa to\dimen@
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\setbox\tw@\vbox{\unvbox\tw@}% natural-sized
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| \message{Box of size \the\ht\@tempboxa\space split to \the\dimen@.
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| Natural height of split box is \the\ht\tw@. }%
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% If the split-to size > (\vsize-\topskip), then set box to full size
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\begingroup
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\advance\dimen@\topskip
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\expandafter\endgroup
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\ifdim\dimen@>\pagegoal
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| \message{Frame is big -- Use up the full column. }%
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\dimen@ii\pagegoal
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\advance\dimen@ii -\topskip
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\advance\dimen@ii \FrameHeightAdjust\relax
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\else % suspect this is wrong:
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% If the split-to size > feasible room_on_page, rebox it smaller.
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\advance\dimen@.8\pageshrink
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\ifdim\ht\tw@>\dimen@
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| \message{Box too tall; rebox it to \the\dimen@. }%
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\dimen@ii\dimen@
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\else % use natural size
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\dimen@ii\ht\tw@
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\fi
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\fi
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% Re-box contents to desired size \dimen@ii
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\advance\dimen@ii -\fb@frh
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\setbox\tw@\vbox to\dimen@ii \bgroup
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% remove simulated frame and page flexibility:
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\vskip -\fb@frh \@plus-\pagestretch \@minus-.8\pageshrink
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\unvbox\tw@ \unpenalty\unpenalty
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\ifdim\lastkern=-137sp % whole box went to next page
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| \message{box split at beginning! }%
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\egroup \fb@resto@set \eject % (\vskip for frame size was discarded)
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\fb@adjheight
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\else %
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\egroup \fb@resto@set
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\ifvoid\@tempboxa % it all fit after all
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| \message{box split at end! }%
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\setbox\@tempboxa\box\tw@
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\else % it really did split
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| \message{box split as expected. Its reboxed height is \the\ht\tw@. }%
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\ifdim\wd\tw@>\z@
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\centerline{\FrameCommand{\box\tw@}}% ??? \centerline bad idea
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\else
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| \message{Zero width means likely blank. Don't frame it (guess)}%
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\box\tw@
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\fi
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\hrule \@height\z@
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\eject
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\fb@adjheight
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\put@frame
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\fi\fi\fi\fi\fi
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\ifvoid\@tempboxa\else
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\centerline{\FrameCommand{\box\@tempboxa}}%
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\nointerlineskip \null %{\showoutput \showlists}
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\penalty-30 \vskip\topsep
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\fi}
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\def\fb@adjheight{%
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\vbox to\FrameHeightAdjust{}% get proper baseline skip from above.
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\penalty\@M \nointerlineskip
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\vskip-\FrameHeightAdjust
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\penalty\@M} % useful for tops of pages
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\edef\zero@glue{\the\z@skip}
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\catcode`\|=\FrameRestore
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% Provide configuration commands:
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\providecommand\FrameCommand{\fboxrule=\FrameRule \fboxsep=\FrameSep \fbox}
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\@ifundefined{FrameRule}{\newdimen\FrameRule \FrameRule=\fboxrule}{}
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\@ifundefined{FrameSep} {\newdimen\FrameSep \FrameSep =3\fboxsep}{}
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% Height of frame above first baseline when frame starts a page:
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\providecommand\FrameHeightAdjust{6pt}
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% \FrameRestore has parts of \@parboxrestore. See how it is used in the
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% "settings" argument of \MakeFrame. Previous behavior can be restored by
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% using \@parboxrestore there, or redefining:
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% \makeatletter \renewcommand\FrameRestore{\@parboxrestore} \makeatother
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\def\FrameRestore{%
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\let\if@nobreak\iffalse
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\let\if@noskipsec\iffalse
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% \let\par\@@par ??
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\let\-\@dischyph
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\let\'\@acci\let\`\@accii\let\=\@acciii
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% \parindent\z@ \parskip\z@skip Definitely omit!
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% \everypar{}% ??
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\linewidth\hsize
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% \@totalleftmargin\z@
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% \leftskip\z@skip \rightskip\z@skip \@rightskip\z@skip
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% \parfillskip\@flushglue \lineskip\normallineskip
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% \baselineskip\normalbaselineskip
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\sloppy
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% \let\\\@normalcr
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}
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% Compatibility with previous versions (temporary!):
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\let\fram@d=\MakeFramed \let\endfram@d=\endMakeFramed
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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