[Bug 2128] New: Improved ellipsization etc.

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           Summary: Improved ellipsization etc.
           Product: Xfce Panel Plugins
           Version: unspecified
          Platform: PC (x86)
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: Medium
         Component: clipman
        AssignedTo: xfce-goodies-dev@...
        ReportedBy: linux@...


Ellipsization (as it stands) is somewhat broken: it doesn't properly take into
account that one character isn't necessarily one byte (or, for that matter, one
glyph) or the width of each glyph.

Also, replacement of tabs, LFs and CRs need not be done: the label could be put
into single-line mode (with the effect that you'll get [000A] and [000D]
instead).


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------- Comment #1 from linux@...  2006-08-06 15:41 UTC -------
Created an attachment (id=710)
 --> (http://bugzilla.xfce.org/attachment.cgi?id=710&action=view)
Improve the ellipsization


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------- Comment #2 from nick@...  2006-08-06 15:58 UTC -------
Although I agree with you there is one problem now, the title that is generated
has the same length (thus size) as the clip, and it gets fully utf8 validated.
Both consume time and memory.

Maybe it's better to use g_strndup (txt, chars+5), so all the 'visible'
characters have all their needed bytes?

If there is a decent solution for this, I'll apply the patch.

Thanks in advance,
Nick


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------- Comment #3 from linux@...  2006-08-06 16:23 UTC -------
chars+5 is not really any better. This really needs to be done according to the
width of the rendered string. chars*6 is closer and is likely to be enough to
cover use of combining marks, but is still (potentially) leaving the string
short  if you have a lot of narrow glyphs.

Also, what if an option to control the position of the ellipsis is added?

Generating the title once would seem to be more appropriate, despite the memory
usage. As things stand, it turns out that clipman_regenerate_titles() can be
removed without side-effects.


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------- Comment #4 from linux@...  2006-08-06 17:14 UTC -------
MAXCHARS*8 should cover it, at least with PANGO_ELLIPSIZE_END. *6 will probably
cover it too, but *8 leaves a margin for error. (There's still at least the
pathological case - lots of zero-width (non-)joiners - but it's probably safe
to ignore that.)

It *won't* cover it if PANGO_ELLIPSIZE_MIDDLE is used, at least not for long
selections.


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nick@... changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED




------- Comment #5 from nick@...  2006-08-06 22:08 UTC -------
I've committed you patch, removed the regenerate_title function and
added strndup (length*8), which could save some time/mem on huge
amounts of text.

I think an ellipses position option is a bit overkill, remember we're still
using Xfce :-).

Thanks for your time,
Nick


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------- Comment #6 from linux@...  2006-08-07 01:36 UTC -------
length*8 combined with the removal of regenerate_title is a bad choice. To
demonstrate:

1. Set the length to 10 characters.
2. Select the whole of the initial description of this BTS entry.
3. Look at the clipman menu. Ellipsization is fine.
4. Set the length to 120 characters.
5. Look at the clipman menu. Whoops, no ellipsization.

The more non-ASCII glyphs are present, the sooner this will become obvious.
From what I've seen of Chinese (simplified) text, each glyph requires three
bytes (if encoded using UTF-8), so 10 characters -> 80 bytes -> 26 glyphs and
one truncated character. That's important, because g_locale_to_utf8() will
return NULL due to the invalid character, and there's no check for that ->
segfault.


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------- Comment #7 from linux@...  2006-08-07 01:53 UTC -------
Created an attachment (id=712)
 --> (http://bugzilla.xfce.org/attachment.cgi?id=712&action=view)
Properly truncate UTF-8 strings & fix a null dereference.


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------- Comment #8 from nick@...  2006-08-07 06:12 UTC -------
Committed, thanks


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