Re: [office] Tabulator (TAB) questions to implementors

[Regina Henschel <regina.henschel@libreoffice.org>]

Hi Svante,

I have looked, what AOO/LO do with tab stops.

Only if the child style has no own style:tab-stops element, then the tab 
stops of the parent style are used.

If the user changes a tab-stop of the child, then the child gets an own 
style:tab-stops element and all current tab-stops of the parent are 
copied to the style. So a "burn-in" is done. This holds for changing a 
style (which is in styles.xml) or changing by direct formatting (which 
is in current.xml).

If all tab stops in the child are deleted, an empty style:tab-stops 
element remains.

When a style:tab-stops element exists for the child -might be an empty 
one-, no tab stops of the parent are used and changes in the tab stops 
of the parent do not propegate to the child. Only when the user resets 
the tab stops to use the inherited ones, the parent style tab stops are 
used again.

There is no mix of parent and child tab stops.

[The UI in AOO/LO does not indicate, whether tab stops are deleted or 
whether they are reset to use the parent ones. I think, that is in error 
in the UI of AOO/LO.]

Kind regards
Regina

Svante Schubert schrieb:
> Are tabulators being inherited in ODF XML similar as style properties are?
> Perhaps the first question should be: Are all other style properties
> being inherited in all circumstances?
>
> Regarding Tabs:
> Within a content (or styles) XML file within a package a TAB declaration
> may look like:
> <style:style style:name="Heading_20_1" style:display-name="Heading 1"
> style:family="paragraph">
>      <style:paragraph-properties>
>          <style:tab-stops>
>              <style:tab-stop style:position="2cm"/>
>              <style:tab-stop style:position="3cm"/>
>              <style:tab-stop style:position="5.001cm"/>
>
> Explained by ODF 1.2 via
> http://docs.oasis-open.org/office/v1.2/os/OpenDocument-v1.2-os-part1.html#element-style_tab-stops
> http://docs.oasis-open.org/office/v1.2/os/OpenDocument-v1.2-os-part1.html#element-style_tab-stop
>
> and inheritance is mentioned for <style:style>
> http://docs.oasis-open.org/office/v1.2/os/OpenDocument-v1.2-os-part1.html#element-style_style
>
>  From a simple test in one ODF application it seems TABs are NOT being
> inherited, which seems wrong at the first sight, but when taking a look
> OOXML, where TABs are being inherited, but can be ignored on paragraph
> level via a 'clear' attribute, the absolute writing of TABs would
> guarantee interoperability.
>
> Please note, the inheritance within the XML, does not say anything about
> about the inheritance during run-time. Even without inheritance, full
> absolute TAB positioning for every paragraph there would be run-time
> inheritance possible.
>
> If we want to inherit TABS during run-time, we would on the other hand
> require something similar to 'clear' to guarantee interoperability among
> the ISO Office format standards.
>
> PS: In addition we might want to define the following attribute for TABs
> as well
> http://docs.oasis-open.org/office/v1.2/os/OpenDocument-v1.2-os-part1.html#attribute-text_relative-tab-stop-position
> as currently the position dependent on the following settings.xml flag:
>
> <config:config-item config:name="TabsRelativeToIndent"
> config:type="boolean">false</config:config-item>
>
> It defines, if the left-margin have to be added to the tab position.
>
> I will write JIRA issues for the problems, as soon we agree that there
> is a problem.
>
> Regards,
> Svante
>
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