Re: Trouble finding bounding rect of NSAttributedString
On Nov 19, 2009, at 9:20 PM, Dave DeLong wrote: However, in both of these methods, the attributedString of the textview is nil, thus giving me the strange results I'm seeing. How are you getting the attributedString out of the textview? (I'm guessing by calling -textStorage.) If so, that should never return nil — make sure the NSTextView* itself isn't nil :) —Jens___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Trouble finding bounding rect of NSAttributedString
Hi everyone, I've been struggling for several hours to get the bounding rectangle of an NSAttributedString when drawn at a particular width. I have an NSTextView that I need to resize dynamically. NSTextView appears to resize itself as I add text, but I also need it to shrink itself as I delete text. Here's what I've tried: [myAttributedString size] [myAttributedString boundingRectWithSize:NSMakeSize(desiredWidth, FLT_MAX) options:NSStringDrawingUsesDeviceMetrics]; [[myTextView layoutManager] usedRectForTextContainer:[myTextView textContainer]] [[myTextView layoutManager] boundingRectForGlyphRange:NSMakeRange(0, [myAttributedString length]) inTextContainer:[myTextView textContainer]] ... and a few others I've been over the documentation for NSAttributedString, NSLayoutManager, and NSTextContainer, and I've tried just about everything that looks like it might give me what I'm looking for. However, I've obviously missed something pretty fundamental to getting my string's rect. Any pointers? Thanks! Dave DeLong smime.p7s Description: S/MIME cryptographic signature ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Trouble finding bounding rect of NSAttributedString
On Nov 19, 2009, at 1:28 PM, Dave DeLong wrote: I have an NSTextView that I need to resize dynamically. NSTextView appears to resize itself as I add text, but I also need it to shrink itself as I delete text. Here's what I've tried: Several of those look like reasonable calls for this purpose. You didn't specify what went wrong when you called them ... ? —Jens___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Trouble finding bounding rect of NSAttributedString
Good point.
When I print out the size or rect that these return, I invariably get either
{0, 0} or something absurd like {{1.17076e-318, 2.29357e-314}, {2.30359e-314,
2.1224e-314}} (that's just running the rect through NSStringFromRect())
Dave
On Nov 19, 2009, at 3:37 PM, Jens Alfke wrote:
On Nov 19, 2009, at 1:28 PM, Dave DeLong wrote:
I have an NSTextView that I need to resize dynamically. NSTextView appears
to resize itself as I add text, but I also need it to shrink itself as I
delete text. Here's what I've tried:
Several of those look like reasonable calls for this purpose. You didn't
specify what went wrong when you called them ... ?
—Jens
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Re: Trouble finding bounding rect of NSAttributedString
On Nov 19, 2009, at 2:39 PM, Dave DeLong wrote:
When I print out the size or rect that these return, I invariably get either
{0, 0} or something absurd like {{1.17076e-318, 2.29357e-314}, {2.30359e-314,
2.1224e-314}} (that's just running the rect through NSStringFromRect())
Make sure the receiver (the NSAttributedString) isn't nil. The Obj-C runtime
gives undefined results for a struct-based method return value if the receiver
is nil; so you'll end up with garbage like this. (This is because it doesn't
know at runtime how large the struct is, so it can't safely fill it in with
zeroes.)
Put in something like NSAssert(str!=nil, @str is nil); before the call.
—Jens___
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Re: Trouble finding bounding rect of NSAttributedString
Your question has caused me to dig deeper...
It seems that when I handle both the NSViewFrameDidChangeNotification and the
NSTableViewSelectionDidChangeNotification notifications, the attributedString
of the textView's layout manager is nil.
This is very interesting... Here's a bit more of my setup. I have an
NSTableView, populated by an NSArrayController. The textView's data is bound
to the arrayController's selection.data (which provides an RTF NSData object).
That works as expected. I observe the ViewFrameDidChangeNotification on the
textView, so that as the user types in text and the textview grows, I can also
resize the superview accordingly.
I was listening to the selectionDidChange notification of the NSTableView,
because (I've observed) when the data to be shown in the textview is smaller
than the current size of the textview, it does not resize down to fit the
content. This is the behavior that I'm looking for.
However, in both of these methods, the attributedString of the textview is nil,
thus giving me the strange results I'm seeing.
What would be the appropriate way to get the behavior I'm looking for?
Thanks,
Dave
On Nov 19, 2009, at 4:28 PM, Jens Alfke wrote:
On Nov 19, 2009, at 2:39 PM, Dave DeLong wrote:
When I print out the size or rect that these return, I invariably get either
{0, 0} or something absurd like {{1.17076e-318, 2.29357e-314},
{2.30359e-314, 2.1224e-314}} (that's just running the rect through
NSStringFromRect())
Make sure the receiver (the NSAttributedString) isn't nil. The Obj-C runtime
gives undefined results for a struct-based method return value if the
receiver is nil; so you'll end up with garbage like this. (This is because it
doesn't know at runtime how large the struct is, so it can't safely fill it
in with zeroes.)
Put in something like NSAssert(str!=nil, @str is nil); before the call.
—Jens
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