I'm trying to determine the best way to enable an NSTextField to
truncate its stringValue (using one of the NSLineBreakMode options)
if that value is too long and won't entirely fit into the field's
frame. My text field has been sized in Interface Builder so that
it will shrink as the window around it is made smaller.
Before you hit reply: I realize this is very simple on 10.4 or
later, with a message to a cell's setWraps:YES and
setLineBreakMode:. IB also allows both of these attributes to be
set easily.
I'm in need of a solution that will work on 10.3.9+, however. The
setLineBreakMode: method was added to the AppKit in Tiger <http://
developer.apple.com/releasenotes/Cocoa/AppKit.html>. The archives
and other usual resources, for the most part, only turned up ideas
about adding this behavior to text inside an NSTableView.
Using an attributed string seemed like a good way to make this
happen. So, I created one with its NSParagraphStyleAttributeName
set to a style with my desired line breaking mode. Then, I just
called setAttributedStringValue: on the NSTextField. This didn't
work, though, and I then tried changing the setWraps attribute of
the text field in case that was the problem. The text field does
handle string attributions correctly (such as fonts) but seems to
ignore the paragraph style's line break mode.
I was able to accomplish non-10.4 truncating by subclassing
NSTextFieldCell and drawing the attributed string (with a
lineBreakStyle attribute) myself:
It appears that NSTextFieldCell was never informing its attributed
string when it wasn't able to fit entirely inside the parent control
view, meaning the attributed string was drawing in a rect larger than
the controlView's bounds.
Even though I'm kinda having a conversation with myself here, I sent
this in-case anyone was curious :) If anyone has a better way, or
I'm forgetting something, please let me know.
- Sean
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