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如何將遞歸行新增到表中，直到它們到達 ConTeXt 中的頁面末端？

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如何將遞歸行新增到表中，直到它們到達 ConTeXt 中的頁面末端？

我在 ConTeXt 中有一個這樣的表：

\starttext
    \chapter{This is a title}

    \bTABLE
    \bTABLEhead
        \bTR \bTD a \eTD \bTD b \eTD \bTD c \eTD \eTR
    \eTABLEhead

    \bTABLEbody
        \dorecurse{100}{%
            \bTR \bTD 1 \eTD \bTD 2 \eTD \bTD 3 \eTD \eTR
        }
    \eTABLEbody
    \eTABLE
\stoptext

如何將遞歸設定為僅重複儲存格，直到填滿頁面其餘部分為止？

答案1

一種可能的演算法是循環排版表格，添加行直到超過頁面上可用的剩餘高度。請注意，這非常慢。

\startbuffer[table]
\bTABLE
\bTABLEhead
    \bTR \bTD a \eTD \bTD b \eTD \bTD c \eTD \eTR
\eTABLEhead

\bTABLEbody
    \dorecurse{\the\scratchcounter}{%
        \bTR \bTD 1 \eTD \bTD 2 \eTD \bTD 3 \eTD \eTR
    }
\eTABLEbody
\eTABLE
\stopbuffer

\showframe

\starttext
    \chapter{This is a title}

    \scratchcounter=1
    \scratchdimen=0pt
    \loop\ifdim\scratchdimen<\dimexpr\pagegoal-\pagetotal-2\lineheight\relax % why 2\lineheight?
        \setbox\scratchbox=\vbox{\getbuffer[table]}
        \scratchdimen=\dimexpr\ht\scratchbox+\dp\scratchbox\relax
        \advance\scratchcounter by 1
    \repeat
    \advance\scratchcounter by -1
    \vbox{\getbuffer[table]}
\stoptext

答案2

這與 Henri Menke 的解決方案相同，但我不是逐條添加行，而是先測量行的高度，然後使用內建命令來\getrawnoflines取得適合剩餘空間的行數。

\define\calculatelines
    {\setbox\scratchbox\hbox{\bTABLE
        \bTR \bTD 1 \eTD \bTD 2 \eTD \bTD 3 \eTD \eTR
      \eTABLE}%
     \openlineheight=\htdp\scratchbox
     \ifdim\pagegoal=\maxdimen % we are at the beginning of the page
          \scratchdimen=\dimexpr\textheight - 2\openlineheight\relax
      \else
          \scratchdimen=\dimexpr\pagegoal - \pagetotal - 2\openlineheight \relax
      \fi
      \getrawnoflines\scratchdimen}

\define\fillTABLE
    {\blank
     \bgroup
     \calculatelines
     \bTABLE
     \bTABLEhead
         \bTR \bTD a \eTD \bTD b \eTD \bTD c \eTD \eTR
     \eTABLEhead

     \bTABLEbody
         \dorecurse{\the\noflines}
             {\bTR \bTD 1 \eTD \bTD 2 \eTD \bTD 3 \eTD \eTR}
     \eTABLEbody
     \eTABLE
     \egroup}


\setuppapersize[A5]
\showframe

\starttext

\fillTABLE

\page

\section{New section}

\fillTABLE

\page

\section{With some text}

\input knuth

\fillTABLE

\stoptext

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