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| Les deux révisions précédentes Révision précédente Prochaine révision | Révision précédente Dernière révision Les deux révisions suivantes | ||
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3_composition:texte:pages:empecher_un_saut_de_page_entre_deux_lignes [2018/05/25 00:06] joseph.wright |
3_composition:texte:pages:empecher_un_saut_de_page_entre_deux_lignes [2018/12/04 00:46] jejust |
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| Ligne 1: | Ligne 1: | ||
| - | --- | + | ====== Preventing page breaks between lines ====== |
| - | section: Adjusting the typesetting | + | |
| - | subsection: Page layout | + | |
| - | permalink: /FAQ-nopagebrk.html | + | |
| - | date: 2014-06-10 | + | |
| - | --- | + | |
| - | # Preventing page breaks between lines | ||
| One commonly requires that a block of typeset material be kept on the | One commonly requires that a block of typeset material be kept on the | ||
| same page; it turns out to be surprisingly tricky to arrange this. | same page; it turns out to be surprisingly tricky to arrange this. | ||
| - | LaTeX provides a `samepage` environment which claims it | + | LaTeX provides a ''samepage'' environment which claims it |
| does this sort of thing for you. It proceeds by setting infinite | does this sort of thing for you. It proceeds by setting infinite | ||
| - | penalties for all sorts of page-break situations; but in many | + | penalties for all sorts of page break situations; but in many |
| situations where you want to prevent a page break, | situations where you want to prevent a page break, | ||
| - | `samepage` doesn't help. If you're trying to keep running | + | ''samepage'' doesn't help. If you're trying to keep running |
| text together, you need to end the paragraph inside the environment | text together, you need to end the paragraph inside the environment | ||
| - | (see [preserving paragraph parameters](FAQ-paraparam.md)). | + | (see [[FAQ-paraparam|preserving paragraph parameters]]). |
| Also, if the things you are trying to keep together insert their own | Also, if the things you are trying to keep together insert their own | ||
| - | pagebreak hints, `samepage` has no power over them (though | + | page break hints, ''samepage'' has no power over them (though |
| - | list items' attempts — they suggest page breaks between items — | + | list items' attempts --- they suggest page breaks between items --- |
| - | are subverted by `samepage`). Naturally, if | + | are subverted by ''samepage''). Naturally, if |
| - | `samepage` _does_ work, it is capable of leaving | + | ''samepage'' //does// work, it is capable of leaving |
| stuff jutting out at the bottom of the page. | stuff jutting out at the bottom of the page. | ||
| Another convenient trick is to set all the relevant stuff in a | Another convenient trick is to set all the relevant stuff in a | ||
| - | `\parbox` (or a `minipage` if it contains things like | + | ''\parbox'' (or a ''minipage'' if it contains things like |
| - | verbatim text that may not be used in the argument of a `\parbox`). | + | verbatim text that may not be used in the argument of a ''\parbox''). |
| - | The resulting box certainly _won't_ break between pages, but | + | The resulting box certainly //won't// break between pages, but |
| that's not to say that it will actually do what you want it to do: | that's not to say that it will actually do what you want it to do: | ||
| again, the box may be left jutting out at the bottom of the page. | again, the box may be left jutting out at the bottom of the page. | ||
| - | Why do neither of these obvious things work? — Because TeX can't | + | Why do neither of these obvious things work? --- Because TeX can't |
| really distinguish between infinitely awful things. | really distinguish between infinitely awful things. | ||
| - | `Samepage` will make any possible break point ''infinitely | + | ''Samepage'' will make any possible break point |
| - | bad'' and boxes don't even offer the option of breaks, but if the | + | "infinitely bad" and boxes don't even offer the option of breaks, but if the |
| alternative is the leave an infinitely bad few centimetres of blank | alternative is the leave an infinitely bad few centimetres of blank | ||
| paper at the bottom of the page, TeX will take the line of least | paper at the bottom of the page, TeX will take the line of least | ||
| resistance and do nothing. | resistance and do nothing. | ||
| - | This problem still arises even if you have `\raggedbottom` in | + | This problem still arises even if you have ''\raggedbottom'' in |
| - | effect: TeX doesn't notice the value of _that_ until it starts | + | effect: TeX doesn't notice the value of //that// until it starts |
| actually shipping a page out. One approach is to set: | actually shipping a page out. One approach is to set: | ||
| - | ```latex | + | |
| + | <code latex> | ||
| \raggedbottom | \raggedbottom | ||
| \addtolength{\topskip}{0pt plus 10pt} | \addtolength{\topskip}{0pt plus 10pt} | ||
| - | ``` | + | </code> |
| - | The `10pt` offers a hint to the output routine that the column is | + | The ''10pt'' offers a hint to the output routine that the column is |
| stretchable; this will cause TeX to be more tolerant of the need to | stretchable; this will cause TeX to be more tolerant of the need to | ||
| stretch while building the page. If you're doing this as a temporary | stretch while building the page. If you're doing this as a temporary | ||
| - | measure, cancel the change to `\topskip` by: | + | measure, cancel the change to ''\topskip'' by: |
| - | ```latex | + | |
| + | <code latex> | ||
| \addtolength{\topskip}{0pt plus-10pt} | \addtolength{\topskip}{0pt plus-10pt} | ||
| - | ``` | + | </code> |
| - | as well as resetting `\flushbottom`. (Note that the `10pt` never | + | as well as resetting ''\flushbottom''. (Note that the ''10pt'' never |
| actually shows up, because it is overwhelmed when the page is shipped | actually shows up, because it is overwhelmed when the page is shipped | ||
| - | out by the stretchability introduced by `\raggedbottom`; however, it | + | out by the stretchability introduced by ''\raggedbottom''; however, it |
| - | could well have an effect if `\flushbottom` was in effect.) | + | could well have an effect if ''\flushbottom'' was in effect.) |
| An alternative (which derives from a suggestion by Knuth in the | An alternative (which derives from a suggestion by Knuth in the | ||
| - | TeXbook) is the package [`needspace`](https://ctan.org/pkg/needspace) or the [`memoir`](https://ctan.org/pkg/memoir) class, | + | TeXbook) is the package [[ctanpkg>needspace|needspace]] or the [[ctanpkg>memoir|memoir]] class, |
| - | which both define a command `\needspace` whose argument tells it | + | which both define a command ''\needspace'' whose argument tells it |
| what space is needed. If the space isn't available, the current page | what space is needed. If the space isn't available, the current page | ||
| is cleared, and the matter that needs to be kept together will be | is cleared, and the matter that needs to be kept together will be | ||
| - | inserted on the new page. For example, if 4 lines of text need to be | + | inserted on the new page. For example, if 4 lines of text need to be |
| kept together, the sequence | kept together, the sequence | ||
| - | ```latex | + | |
| + | <code latex> | ||
| \par | \par | ||
| \needspace{4\baselineskip} | \needspace{4\baselineskip} | ||
| Ligne 72: | Ligne 69: | ||
| <text generating lines 1-4> | <text generating lines 1-4> | ||
| % now stuff we don't mind about | % now stuff we don't mind about | ||
| - | ``` | + | </code> |
| Yet another trick by Knuth is useful if you have a sequence of small | Yet another trick by Knuth is useful if you have a sequence of small | ||
| blocks of text that need, individually, to be kept on their own page. | blocks of text that need, individually, to be kept on their own page. | ||
| - | Insert the command `\filbreak` before each small block, and the | + | Insert the command ''\filbreak'' before each small block, and the |
| effect is achieved. The technique can be used in the case of | effect is achieved. The technique can be used in the case of | ||
| - | sequences of LaTeX-style sections, by incorporating `\filbreak` | + | sequences of LaTeX-style sections, by incorporating ''\filbreak'' |
| - | into the definition of a command (as in | + | into the definition of a command (as in |
| - | [patching commands](FAQ-patch.md)). A simple and effective | + | [[FAQ-patch|patching commands]]). A simple and effective |
| patch would be: | patch would be: | ||
| - | <!-- {% raw %} --> | + | |
| - | ```latex | + | |
| + | <code latex> | ||
| \let\oldsubsubsection=\subsubsection | \let\oldsubsubsection=\subsubsection | ||
| \renewcommand{\subsubsection}{% | \renewcommand{\subsubsection}{% | ||
| Ligne 88: | Ligne 86: | ||
| \oldsubsubsection | \oldsubsubsection | ||
| } | } | ||
| - | ``` | + | </code> |
| - | <!-- {% endraw %} --> | + | |
| While the trick works for consecutive sequences of blocks, it's | While the trick works for consecutive sequences of blocks, it's | ||
| slightly tricky to get out of such sequences unless the sequence is | slightly tricky to get out of such sequences unless the sequence is | ||
| - | interrupted by a forced page break (such as `\clearpage`, which may | + | interrupted by a forced page break (such as ''\clearpage'', which may |
| - | be introduced by a `\chapter` command, or the end of the document). | + | be introduced by a ''\chapter'' command, or the end of the document). |
| If the sequence is not interrupted, the last block is likely to be | If the sequence is not interrupted, the last block is likely to be | ||
| forced onto a new page, regardless of whether it actually needs it. | forced onto a new page, regardless of whether it actually needs it. | ||
| Ligne 104: | Ligne 102: | ||
| decide, case by case, how to deal with problems at the last | decide, case by case, how to deal with problems at the last | ||
| proof-reading stage. At this stage, you can manually alter page | proof-reading stage. At this stage, you can manually alter page | ||
| - | breaking, using either `\pagebreak` or `\clearpage`, or you can | + | breaking, using either ''\pagebreak'' or ''\clearpage'', or you can |
| - | place a `\nopagebreak` command to suppress unfortunate breaks. | + | place a ''\nopagebreak'' command to suppress unfortunate breaks. |
| Otherwise, you can make small adjustments to the page geometry, using | Otherwise, you can make small adjustments to the page geometry, using | ||
| - | `\enlargethispage`. Supposing you have a line or two that stray: | + | ''\enlargethispage''. Supposing you have a line or two that stray: |
| - | issue the command `\enlargethispage{2`\baselineskip`}` and | + | issue the command ''\enlargethispage{2''\baselineskip''}'' and |
| two lines are added to the page you're typesetting. Whether this | two lines are added to the page you're typesetting. Whether this | ||
| looks impossibly awful or entirely acceptable depends on the document | looks impossibly awful or entirely acceptable depends on the document | ||
| context, but the command remains a useful item in the armoury. | context, but the command remains a useful item in the armoury. | ||
| - | Note that both `\pagebreak` and `\nopagebreak` take an optional | + | Note that both ''\pagebreak'' and ''\nopagebreak'' take an optional |
| number argument to adjust how the command is to be interpreted. Thus | number argument to adjust how the command is to be interpreted. Thus | ||
| - | `\pagebreak[0]`, the command ''suggests'' that a page break | + | ''\pagebreak[0]'', the command "suggests" that a page break |
| - | might be worth doing, whereas `\pagebreak[4]` ''demands'' a | + | might be worth doing, whereas ''\pagebreak[4]'' "demands" a |
| - | page break. Similarly `\nopagebreak[0]` makes a suggestion, | + | page break. Similarly ''\nopagebreak[0]'' makes a suggestion, |
| - | while `\nopagebreak[4]` is a demand. In both commands, the | + | while ''\nopagebreak[4]'' is a demand. In both commands, the |
| default value of the optional argument is 4. | default value of the optional argument is 4. | ||
| + | ----- | ||
| + | |||
| + | //Source:// [[faquk>FAQ-nopagebrk|Preventing page breaks between lines]] | ||
| + | |||
| + | {{htmlmetatags>metatag-keywords=(LaTeX,formatting) | ||
| + | metatag-og:title=(Preventing page breaks between lines) | ||
| + | metatag-og:site_name=(FAQ LaTeX francophone) | ||
| + | }} | ||
