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Re: Issue-286 padding

From: Innovimax W3C <innovimax+w3c@gmail.com>
Date: Thu, 19 Dec 2013 17:47:12 +0100
Message-ID: <CAAK2GfF2HWX8j_6vH=k1c=YNUGoKDPqA1cExXy_B1g_4sQoytg@mail.gmail.com>
To: Nigel Megitt <nigel.megitt@bbc.co.uk>
Cc: Glenn Adams <glenn@skynav.com>, TTWG <public-tt@w3.org>
Can't we just reuse the CSS Box Model ?

http://www.w3.org/TR/CSS21/box.html

Mohamed

On Thu, Dec 19, 2013 at 5:36 PM, Nigel Megitt <nigel.megitt@bbc.co.uk>wrote:

>  On further reflection EBU decided to avoid potential causing confusion
> by overloading padding on p in the way originally described, and refactored
> the proposed solution to meet strictly the original requirement:
>
>  It is now an attribute called ebutts:linePadding.
> It is an inherited property that is applied to rendered lines within block
> elements.
> It has a single value that is applied equally to the start and end edges
> of each line and not to before and after edges.
> The unit permitted is a non-negative number with option decimal fraction
> followed by "c", i.e it uses the c metric.
> Each line area is extended by the distance specified.
> The maximum available inline progression distance in which foreground text
> may be laid out on a single line in a block element is diminished by 2x the
> linePadding distance.
>  The background color that applies at each start and end edge is used to
> extend the background color fill within the extended line area.
>
>  The attached diagram replaces the previously circulated diagram and
> exemplifies most of the above (in this case for left justified lines).
>
>  Nigel
>
>
>
>   On 04/12/2013 16:11, "Nigel Megitt" <nigel.megitt@bbc.co.uk> wrote:
>
>   Specifically on padding, the EBU discussed this requirement further
> last week and agreed that the requirement that foreground layout must not
> be affected can be relaxed: even though it's not the ideal solution it does
> have a safe fallback. This in turn permitted a revised requirement that
> should be easier to implement in CSS and can be expressed as a definition
> of tts:padding on <p>, which is currently not defined in TTML. The attached
> diagram explains the expected behaviour, i.e. that padding is applied to
> each rendered line and acts very much like a line-based version of region
> padding.
>
>  Note that this solution does not define <span> based padding which
> wouldn't really work here  the padding would interfere with intended
> spacing. However EBU does not have a requirement for this.
>
>  Nigel
>
>   On 13/11/2013 16:07, "Glenn Adams" <glenn@skynav.com> wrote:
>
>   The attached shows the difference between putting the
> background/padding on span versus p. Take your pick.
>
>
>
> On Wed, Nov 13, 2013 at 12:15 PM, Nigel Megitt <nigel.megitt@bbc.co.uk>wrote:
>
>>  Thanks Glenn,
>>
>>  I'm not sure this meets the described rowPadding requirements - the
>> padding appears to be attached to the <p> not the rendered rows of text, so
>> if an automatic (i.e. not explicit) line break is inserted the padding
>> isn't added to the new rows. Is there a way to extend it to do that as well?
>>
>>  Nigel
>>
>>  ------------------------------
>> *From:* Glenn Adams [glenn@skynav.com]
>> *Sent:* 13 November 2013 03:03
>> *To:* TTWG
>> *Subject:* Re: row align and padding
>>
>>    Here's are two versions that work on Safari. For Safari 6.0.5 or
>> earlier, use the one labeled old syntax. For 6.1 and 7.0, use the other
>> (which uses new syntax). Safari still requires use of the "-webkit-" prefix
>> in both cases.
>>
>>
>> On Wed, Nov 13, 2013 at 5:09 AM, Glenn Adams <glenn@skynav.com> wrote:
>>
>>> Simplified and clean up example, using single <p> for each caption's
>>> text (instead of separate p per line).
>>>
>>>
>>> On Tue, Nov 12, 2013 at 5:56 PM, Glenn Adams <glenn@skynav.com> wrote:
>>>
>>>> The attached uses to CSS3 Flexbox and a few other properties to produce
>>>> the desired effects for the row align and padding examples I've seen. It
>>>> works on current versions of Chrome, Firefox, and Opera. It doesn't seem to
>>>> work on Safari 6.0.5. I haven't tested IE, but supposedly IE10 and
>>>> following supports Flexbox.
>>>>
>>>
>>>
>>
>>
>> ----------------------------
>>
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>
>
>
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Received on Thursday, 19 December 2013 16:47:44 UTC

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