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From "Roger Whitcomb (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PIVOT-623) ellipsis style on labels
Date Mon, 06 Jun 2011 15:20:59 GMT

    [ https://issues.apache.org/jira/browse/PIVOT-623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13044906#comment-13044906

Roger Whitcomb commented on PIVOT-623:

I have a label field that displays a server/machine/host name, which normally (maybe always)
will not have any spaces.  On most systems the screen space available is sufficient, but on
some (where the host includes the domain name or is simply a long name) there is not enough
space, so I would like the text to wrap.  But, even if "wrapText" is true it won't wrap this
text because there is no whitespace.  So, the intention is to be able to specify a list (one
or more) of characters that can be used instead of whitespace to break the string for wrapping.
 This is specified to the skin as a style (same as "wrapText").  In my particular case, I
have a "wrapChars" setting of ".-_/\\" which are the only possible punctuation that would
be in my text.  

What the patch does is prescan the text to see if there is any whitespace, and if not, then
if a "wrapChars" string is specified it will use those characters instead of whitespace to
break.  The only other wrinkle is that is has to back up one char so that the non-whitespace
wrapping character will still be displayed (on the subsequent line).

So, on my example, my label text is "roger-whitcombs-computer.local/MX".  Without this change
there is enough room for about "roger-whitcombs-compu" and then it disappears off the right
edge.  With this change and the "wrapChars" setting above it displays as:

Is that a clear explanation?

I'm not wedded to this concept, but I was trying to figure out a sensible scheme for allowing
a wrap in the absence of whitespace.  I thought of just using any punctuation, but there is
not a single function in the Character class to figure this out and it was sort of messy to
check all the possible Unicode punctuation attribute values.  So, this approach seemed simpler
and a bit more flexible (you could break on selected punctuation, or even on certain alphabetic
or numeric characters if that made sense in your application).

If it doesn't seem like something you want in Pivot, I can do the wrapping myself also in
my app.  Just seemed nicer to leverage the calculations that were already being done in LabelSkin.


> ellipsis style on labels
> ------------------------
>                 Key: PIVOT-623
>                 URL: https://issues.apache.org/jira/browse/PIVOT-623
>             Project: Pivot
>          Issue Type: Wish
>          Components: wtk, wtk-terra
>            Reporter: Sandro Martini
>            Assignee: Sandro Martini
>            Priority: Minor
>             Fix For: 2.1
>         Attachments: label.diff
> Add an ellipsis style on labels (default off), to trim the drawn label if it's too long
in respect of the space assigned.
> Depending on the chosen style, ellipsis chars could go at end of the label, at center,
at start, etc ... 
> Could be useful in some cases to have also "strange" behaviors, like for URLs or file
paths where for example could be useful to trim some parts of the string but near the end
of the path, but keeping the filename part full (if possible).
> Verify if enable user defined behaviors also (for example giving in a sub-style attribute
the full classname of a custom implementation, but maybe this could be too complex or not
in line with other parts in Pivot.
> Verify if add also a sub-style attribute to set a different char to use for the ellipsis
(instead of the default "...").

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