Re: NSTextView, Mail, and umlauts / combining marks / diacriticals
Re: NSTextView, Mail, and umlauts / combining marks / diacriticals
- Subject: Re: NSTextView, Mail, and umlauts / combining marks / diacriticals
- From: Aki Inoue <email@hidden>
- Date: Thu, 18 Oct 2007 09:39:59 -0700
Dominik,
The Mail (or WebView) behavior is not a feature, but rather a
limitation of the rendering engine 8-).
Since XML contents (including HTML) are recommended to be maximally
precomposed, WebKit is favoring not to bother accent compositions in
certain cases to gain performance.
There are several ways to achieve what you're looking for here.
If what your users are requesting really is an ability to edit accent
marks, you could use -deleteBackwardByDecomposingPreviousCharacter:
method (it's bound to Control-Delete key by default).
The variant of -deleteBackward: method treats accent characters
individually.
If you really need to display the base character and accents
separately, you could subclass NSTextStorage and dynamically switch
the content of string returned. For example, you could insert a space
between the base character and accent characters when displaying them
separately. Conventionally Unicode suggests the space character (U
+0020) as the spacer.
A little more involved approach is to unmarking combining marks so
that the rendering engine treats them as normal.
NSGlyphGenerator marks combining marks as NSGlyphInscribeOverstrike
indicating the need for rendering time composition.
You could have a custom NSGlyphGenerator subclass that filters the
flag out. One gotcha here is that there are some fonts that use
negative glyph advancement by default for combining marks. You might
have to tweak the glyph position for these cases.
Aki
On 2007/10/18, at 6:31, Dominik Wagner tcm wrote:
On 18.10.2007, at 15:21, Ricky Sharp wrote:
On Thursday, October 18, 2007, at 07:17AM, "Manfred Schwind" <email@hidden
> wrote:
What our customers want is to clearly be able to see and edit every
codepoint of unicode. so they see a a" if it has two codepoints
and a รค if it has one.
Would it help to insert e.g. a "Zero Width No-Break Space" (Unicode
0001) between every codepoint?
Regards,
Mani
I would not recommend doing that. ZWNBS happens to also be used
for the UTF-16 BOM. There is another character to used instead
should you need to go this route (see unicode.org "BOM" FAQ)
Having said that, a proper solution I think would be to step down
to lower-level text APIs and not use the higher-level ones.
Since i don't want to do that and still have seen that mail actually
does seperate the a and the " in its plain text mode: Doug or Aki,
can you tell me how this is achieved?
Best,
dom
--
Dominik Wagner Mail: email@hidden
TheCodingMonkeys http://www.codingmonkeys.de/
Blog - DasGenie: !Scrap http://scrap.dasgenie.com/
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| References: | |
| | >NSTextView, Mail, and umlauts / combining marks / diacriticals (From: Dominik Wagner tcm <email@hidden>) |
| | >Re: NSTextView, Mail, and umlauts / combining marks / diacriticals (From: Half Activist <email@hidden>) |
| | >Re: NSTextView, Mail, and umlauts / combining marks / diacriticals (From: Dominik Wagner tcm <email@hidden>) |
| | >Re: NSTextView, Mail, and umlauts / combining marks / diacriticals (From: Manfred Schwind <email@hidden>) |
| | >Re: NSTextView, Mail, and umlauts / combining marks / diacriticals (From: Ricky Sharp <email@hidden>) |
| | >Re: NSTextView, Mail, and umlauts / combining marks / diacriticals (From: Dominik Wagner tcm <email@hidden>) |