[xep-support] Re: Issue with change bars and external graphics

Hi Michael,

Indeed, I hadn't thought of the keep-together. Thanks for the explanation
and the tip!

-- Patricia

On 22 March 2012 02:23, Michael Sulyaev <msulyaev@renderx.com> wrote:

> On 03/21/2012 11:22 AM, Patricia Piolon wrote:
>
>> With the following fo I get a change bar in pdf that is only 1 line
>> high, even though the graphic is much higher. Is this normal behaviour?
>>
>
> Hi Patricia,
>
> I believe this is normal. Imagine you had just one short word changed and
> surrounded with change-bar-begin and change-bar-end, in the middle of the
> line. When rendered, both virtual points for the Begin and the End are on
> the same position vertically - at the baseline of that word. So, you see 1
> line tall change bar actually because XEP has special treatment for this
> case: as if the Start was at baseline plus font-size*1.2 (iirc).
>
> Now, if you consider a tall image instead of that word - nothing changes,
> the bar is still just 1 line-height tall, and it does not mark the whole
> image (which is an inline-mode element, like fo:character).
>
>
>
> I know I can fix it by wrapping the graphic in a block and
>> starting/ending the change bars before/after the block, but then it's
>> possible for the block to start on page 1 while the graphic gets pushed
>> to page 2 due to lack of space, resulting in a change bar on 'empty
>> space' on page 1 as well as the graphic itself on page 2. This is highly
>> undesirable.
>>
>
> I understand your intention. Apparently, you assume that a matched pair of
> change-bar-begin and change-bar-end atomic elements tends to shrink in
> order to produce a change bar as short as possible, marking all that's
> between. But actually this is not the case. Change bar points are
> completely transparent for the core algorithms.
>
> To get the desired layout, indeed, you would need to wrap the graphics in
> a block, surround with the change-bar points, and place altogether in yet
> another block or a block-container with keep-together.within-column="**always".
> This is likely to prevent bars on empty space near page break.
>
> Regards,
> Mike
>
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Received on Sun Apr 29 23:49:05 2012