Margin heading problem, was Re: sections

Margin heading problem, was Re: sections

[Rik Kabel]

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On 2014-06-01 12:52, Hans Hagen wrote:
> On 6/1/2014 5:40 PM, Rik wrote:
>
>> Is this also the cause of problems I noted with heading placed into the
>> margin, as in the example below?
>
> no, unrelated, try this:
>
> \setuphead
>   [section]
>   [after={\strut\blank[-2*line,samepage,disable]},
>    command=\SectionCommand,
>    distance=0pt]
>
> \define[2]\SectionCommand{\inleft{XXXXXX}}

That was fine until it ran into \setupwhitespace with a non-zero value. 
Fiddling with the after key \blank does not appear to help.

    \define[2]\MarginHead{\inmargin{#1\\#2}}
    \setuphead    [section]
                   [command=\MarginHead,
                    distance=0pt,
                    after={\strut\blank[-2*line,samepage,disable]}]
    %% With no \setupwhitespace, or any \setupwhitespace setting that
    %%   results in zero interparagraph whitespace, all is well.
    %setupwhitespace      [none]%    okay
    %setupwhitespace      [fix]%     okay
    %% With non-zero interparagraph whitespace, the heading separates
    %%   from the text
    \setupwhitespace      [line]%    bad
    \starttext
    \startchapter[title={Weisman}]
      \input weisman\par
      \input weisman
    \startsection[title={Thuan}]
      \input thuan\par
      \input thuan
    \stopsection
    \stopchapter
    \stoptext

-- 
Rik Kabel

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Re: Margin heading problem, was Re: sections

[Hans Hagen]

On 6/2/2014 3:44 AM, Rik Kabel wrote:
> On 2014-06-01 12:52, Hans Hagen wrote:
>> On 6/1/2014 5:40 PM, Rik wrote:
>>
>>> Is this also the cause of problems I noted with heading placed into the
>>> margin, as in the example below?
>>
>> no, unrelated, try this:
>>
>> \setuphead
>>   [section]
>>   [after={\strut\blank[-2*line,samepage,disable]},
>>    command=\SectionCommand,
>>    distance=0pt]
>>
>> \define[2]\SectionCommand{\inleft{XXXXXX}}
>
> That was fine until it ran into \setupwhitespace with a non-zero value.
> Fiddling with the after key \blank does not appear to help.
>
>     \define[2]\MarginHead{\inmargin{#1\\#2}}
>     \setuphead    [section]
>                    [command=\MarginHead,
>                     distance=0pt,
>                     after={\strut\blank[-2*line,samepage,disable]}]
>     %% With no \setupwhitespace, or any \setupwhitespace setting that
>     %%   results in zero interparagraph whitespace, all is well.
>     %setupwhitespace      [none]%    okay
>     %setupwhitespace      [fix]%     okay
>     %% With non-zero interparagraph whitespace, the heading separates
>     %%   from the text
>     \setupwhitespace      [line]%    bad
>     \starttext
>     \startchapter[title={Weisman}]
>       \input weisman\par
>       \input weisman
>     \startsection[title={Thuan}]
>       \input thuan\par
>       \input thuan
>     \stopsection
>     \stopchapter
>     \stoptext

you can always skip back whitespace or add 'nowhite'

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
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Re: Margin heading problem, was Re: sections

[Rik Kabel]

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On 2014-06-02 04:09, Hans Hagen wrote:
> On 6/2/2014 3:44 AM, Rik Kabel wrote:
>> On 2014-06-01 12:52, Hans Hagen wrote:
>>> On 6/1/2014 5:40 PM, Rik wrote:
>>>
>>>> Is this also the cause of problems I noted with heading placed into 
>>>> the
>>>> margin, as in the example below?
>>>
>>> no, unrelated, try this:
>>>
>>> \setuphead
>>>   [section]
>>>   [after={\strut\blank[-2*line,samepage,disable]},
>>>    command=\SectionCommand,
>>>    distance=0pt]
>>>
>>> \define[2]\SectionCommand{\inleft{XXXXXX}}
>>
>> That was fine until it ran into \setupwhitespace with a non-zero value.
>> Fiddling with the after key \blank does not appear to help.
>>
>>     \define[2]\MarginHead{\inmargin{#1\\#2}}
>>     \setuphead    [section]
>>                    [command=\MarginHead,
>>                     distance=0pt,
>> after={\strut\blank[-2*line,samepage,disable]}]
>>     %% With no \setupwhitespace, or any \setupwhitespace setting that
>>     %%   results in zero interparagraph whitespace, all is well.
>>     %setupwhitespace      [none]%    okay
>>     %setupwhitespace      [fix]%     okay
>>     %% With non-zero interparagraph whitespace, the heading separates
>>     %%   from the text
>>     \setupwhitespace      [line]%    bad
>>     \starttext
>>     \startchapter[title={Weisman}]
>>       \input weisman\par
>>       \input weisman
>>     \startsection[title={Thuan}]
>>       \input thuan\par
>>       \input thuan
>>     \stopsection
>>     \stopchapter
>>     \stoptext
>
> you can always skip back whitespace or add 'nowhite'

Well, nowhite is a start, but the solution is still a way off. 
Meanwhile, the following works for non-grid layouts with reasonable 
values for \setupwhitespace, although perhaps somebody can come up with 
a more eloquent way to write it:

    \newdimen\SectionHeadSkip
    \SectionHeadSkip\dimexpr-2\lineheight-\parskip\relax
    \setuphead
       [section]
       [command=\SectionCommand,
        distance=0pt,
        after={\strut\blank[\the\SectionHeadSkip,samepage,disable,nowhite]},
       ]
      \define[2]\SectionCommand
        {\inmargin{#1 -- #2}}

When enabling grid layouts, the number of lines needs to be adjusted.

Floats that appear as the first thing after a heading may present 
problems, especially with larger values for \setupwhitespace. (The 
default, with no location= specified, is pretty good, but when 
location={left,force} or such, there is often an unwanted offset from 
the header. and page breaks still appear between the heading and figure 
at times, despite the samepage setting for \blank.)

So, this is quite fragile. It requires careful checking of every 
heading, and manual tuning when one breaks. Not a desirable solution, 
but at least it is possible.

-- 
Rik Kabel

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___________________________________________________________________________________

Re: Margin heading problem, was Re: sections

[Rik Kabel]

On 2014-06-02 19:16, Rik Kabel wrote:
> On 2014-06-02 04:09, Hans Hagen wrote:
>> On 6/2/2014 3:44 AM, Rik Kabel wrote:
>>> On 2014-06-01 12:52, Hans Hagen wrote:
>>>> On 6/1/2014 5:40 PM, Rik wrote:
>>>>
>>>>> Is this also the cause of problems I noted with heading placed into
>>>>> the
>>>>> margin, as in the example below?
>>>>
>>>> no, unrelated, try this:
>>>>
>>>> \setuphead
>>>>   [section]
>>>>   [after={\strut\blank[-2*line,samepage,disable]},
>>>>    command=\SectionCommand,
>>>>    distance=0pt]
>>>>
>>>> \define[2]\SectionCommand{\inleft{XXXXXX}}
>>>
>>> That was fine until it ran into \setupwhitespace with a non-zero value.
>>> Fiddling with the after key \blank does not appear to help.
>>>
>>>     \define[2]\MarginHead{\inmargin{#1\\#2}}
>>>     \setuphead    [section]
>>>                    [command=\MarginHead,
>>>                     distance=0pt,
>>> after={\strut\blank[-2*line,samepage,disable]}]
>>>     %% With no \setupwhitespace, or any \setupwhitespace setting that
>>>     %%   results in zero interparagraph whitespace, all is well.
>>>     %setupwhitespace      [none]%    okay
>>>     %setupwhitespace      [fix]%     okay
>>>     %% With non-zero interparagraph whitespace, the heading separates
>>>     %%   from the text
>>>     \setupwhitespace      [line]%    bad
>>>     \starttext
>>>     \startchapter[title={Weisman}]
>>>       \input weisman\par
>>>       \input weisman
>>>     \startsection[title={Thuan}]
>>>       \input thuan\par
>>>       \input thuan
>>>     \stopsection
>>>     \stopchapter
>>>     \stoptext
>>
>> you can always skip back whitespace or add 'nowhite'
>
> Well, nowhite is a start, but the solution is still a way off.
> Meanwhile, the following works for non-grid layouts with reasonable
> values for \setupwhitespace, although perhaps somebody can come up with
> a more eloquent way to write it:
>
>     \newdimen\SectionHeadSkip
>     \SectionHeadSkip\dimexpr-2\lineheight-\parskip\relax
>     \setuphead
>        [section]
>        [command=\SectionCommand,
>         distance=0pt,
>         after={\strut\blank[\the\SectionHeadSkip,samepage,disable,nowhite]},
>        ]
>       \define[2]\SectionCommand
>         {\inmargin{#1 – #2}}
>

A better formulation (better because it preserves any stretch that might 
defined by \setupwhitespace):

	\setupwhitespace [big]
	\newdimen\Parskip
	\Parskip\dimexpr-\parskip\relax
	\setuphead
	  [section]
	  [command=\SectionCommand,
	   distance=0pt,
	   after={\strut\blank[\the\Parskip,-2*line,
				samepage,disable,nowhite]},
   ]
	\define[2]\SectionCommand
	  {\inmargin{#1 – #2}}

As with the previous, \Parskip has to be redefined if \setupwhitespace 
changes, so it is probably best left until after \starttext, when the 
body font is established.

> When enabling grid layouts, the number of lines needs to be adjusted.

No, it is not stable on grid layouts. Sections that have a figure placed 
as the first thing will be a line off.

>
> Floats that appear as the first thing after a heading may present
> problems, especially with larger values for \setupwhitespace. (The
> default, with no location= specified, is pretty good, but when
> location={left,force} or such, there is often an unwanted offset from
> the header. and page breaks still appear between the heading and figure
> at times, despite the samepage setting for \blank.)
>
> So, this is quite fragile. It requires careful checking of every
> heading, and manual tuning when one breaks. Not a desirable solution,
> but at least it is possible.

Still fragile.

-- 
Rik Kabel

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