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RE: [Feature request] face property `raise'
From: |
Wedler, Christoph |
Subject: |
RE: [Feature request] face property `raise' |
Date: |
Wed, 9 Apr 2003 20:06:42 +0200 |
Kai Grossjohann wrote:
> "Wedler, Christoph" <address@hidden> writes:
>> > I would like to see a face property `raise' with the same
>> > semantics as the display property `raise'.
>>
>> > I don't think so. Raising is not a matter of how something is
>> > displayed, but where it is displayed.
>>
>> Where something is displayed (at least relatively, and that's what
>> `raise' is about) is a special case of how something is displayed.
> [...] So I agree with Richard that it is about "where", and much less
> about "how". ({Super,sub,...}scripts are usually smaller, so that
> the size could be added to "how".)
Hm, my point[1] was that the where-vs-how distinction is not only
unclear[2], it's also not the right distinction to decide which property
should be a display property and which a face property (the property
`image' is clearly "how" and should be made a face property if I follow
Richards reasoning).
IMHO, the right distinction is:
1. If the value of a property is specific for ONE PART of the buffer,
it is useful to have this property as a DISPLAY property.
2. If the value of a property is the same for a CLASS of characters in
the buffer, it is useful to have this property as a FACE property.
Example for 1: absolute positions (one kind of "where") are specific to
one part of the buffer and are therefore useful for a display property
(e.g., :align-to).
Example for 1: most images shouldn't be displayed more than once in a
buffer, i.e., there are specific to one part of the buffer => the image
property is correctly a display property (images don't have to do
anything with "where", don't they? ...but clearly with "how"!). (To
support images as icons, one could imagine `image' as a face property,
too.)
Example for 2: property `raise' (I have already provided 2-3 examples:
super-/subscripts and footnote numbers). If you have an example where
it is useful to assign this property to one specific part of the buffer
(and want a display property for this), that fine for me, but please
make `raise' a face property, since it is mostly used for a CLASS of
characters.
- Christoph
[1] unfortunately, only the intro of my message was cited, not part of
the rest of the 45 lines...
[2] relative-"where" can be seen as a specific "how". Kai, of course,
if R (relative-"where") is a subset of W ("where") and H ("how"), and x
(property raise) is an element of R, then x might be more about W than
H, but it remains the fact that x is also an element of H.
- [Feature request] face property `raise', Wedler, Christoph, 2003/04/07
- RE: [Feature request] face property `raise', Wedler, Christoph, 2003/04/08
- RE: [Feature request] face property `raise',
Wedler, Christoph <=
- RE: [Feature request] face property `raise', Wedler, Christoph, 2003/04/10
- RE: [Feature request] face property `raise', Wedler, Christoph, 2003/04/11
- RE: [Feature request] face property `raise', Wedler, Christoph, 2003/04/29