Hello,
I have a multiple-page text view, much like the one in TextEdit, except that
mine has a custom clip view that draws a shadow around the view it contains and
the page view gets different text storages swapped in and out of it (using
NSTextStorage's -addLayoutManager:). All of which makes it a little more
complicated, of course.
Any way, I have a really odd (to me) problem with the display not getting
updated properly. Basically, when text gets added to my multiple page view, an
-addPage: method gets called from the NSLayoutManager delegate method,
-layoutManager:didCompleteLayoutForTextContainer:atEnd:, all exactly the same
as in TextEdit. At this point, obviously, the frame gets recalculated,
-setNeedsDisplay: gets called, and also, I post a notification that the page
number has changed and use -setStringValue: on an NSTextField that displays the
number of pages.
The -drawRect: method of my pages view deals with drawing the page backgrounds,
and, as I say, my custom clip view (NSClipView subclass) deals with drawing a
shadow around its document view as an extra visual touch.
The problem, however, is that sometimes the display only seems to get updated
for the first page - so that even though there may be two or three pages (or
more) present - with the frame set accordingly - the background only draws one
page, the clip view only draws the shadow around the document frame as it was
when the multiple page view only had one page, and my text field only displays
"1 page". If I NSLog just before and after -setStringValue: on my text field,
it shows that the value I am setting is correct, it is just that the text field
is not getting updated. Obviously, I can call -display on the text field
(-setNeedsDisplay: does nothing in this situation, for some reason), but I
can't do the same for my multiple text view, as that reeks havoc with the
layout and can cause more pages than necessary to be laid out.
In short, I can't find exactly where I need to call either -display or
-setNeedsDisplay: without causing redrawing problems (where I have called
-display successfully, it has thickened the text as though it is being drawn
twice).
If anyone has any ideas about what I might be doing wrong here, or why the
display might not get updated properly in this situation, I would be very
grateful. What is really odd is that the frame is getting set accordingly,
which should really cause the clip view to redraw, and my frame recalculation
methods also call -setNeedDisplay: on the multi-page view - but all with no
effect.
Thanks in advance and all the best,
Keith
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