Re: NSLayoutConstraint crash

[David Catmull]

Thanks for the responses. It looks like it was a problem with how I was
instantiating my NSStackView subclass in the xib. I dragged in a Custom
View and then changed the class, I guess assuming that IB would see that my
class is a subclass of NSStackView. Of course, what I should have done was
drag in a stack view and then change the class. I'm not sure exactly why
that resolved the exception, but it needed fixing anyway.

On Fri, Mar 16, 2018 at 11:12 AM, Jack Brindle <jackbrin...@me.com> wrote:

> I would be willing to bet that you are throwing a lot of constraint
> exceptions without realizing it.
> When the view is laid out the constraints are evaluated, including the
> priorities. When a set
> of constraints has a conflict with another (very easy to do) the
> priorities come into play. If
> you set the constraints in IB and do not set the priorities, then they
> will usually be the same.
> The view system will then have to take a guess at what you really wanted
> to do, breaking
> one of the constraints (usually the very one you find most important).
> This will be
> displayed in the log as a constraint exception. Many times it will take
> several layout
> passes before it finds a setup it can work with. Reading the constraint
> display information
> is an art, but one that can be learned and is then very valuable.
>
> It turns out that the key to really understanding and working with
> constraints is in setting
> priorities properly. This takes a while to figure out, but it appears to
> be something you
> are about to go through. As you lay out the views and set the constraints,
> try to make
> sure that there is only a single set of constraints on each view, and then
> if there are
> more than one, the priorities are set so that the views will display where
> you want
> them to be.
>
> There is another thing that most developers don’t realize - the view
> system will create
> constraints behind your back if you let it. It will use the autoresizing
> mask to generate
> constraints, which means there is an extra set of constraints that can
> interfere with
> what you really want. In most of my view controllers in either the
> viewDidLoad or
> awakeFromNib you will find the line:
> view.translatesAutoresizingMaskIntoConstraints = NO;
> This allows me to only have the constraints I set, eliminating a lot of
> issues.
>
> There are a few NSView methods that will dump the constraints in place for
> the view:
>
> constraints
>
> will return the constraints for a view. This is all the constraints (in an
> NSArray) and
> will show you everything, including some not so useful things.
>
> After a layout has occurred, use:
> constraintsAffectingLayoutForOrientation:
>
> The NSArray of constraints will include the ones you really want to look
> at for
> the view. This is the one you really want to use to see what is actually
> going on.
>
> Constraints is a very big topic with many things to learn and control.
> They are
> very powerful, and thus very maddening when they don’t work they way you
> understand. Take the time to learn how to use them, and you will be much
> happier!
>
> - Jack
>
>
> > On Mar 16, 2018, at 9:40 AM, David Catmull <davidcatm...@gmail.com>
> wrote:
> >
> > I might try it, but it's difficult to do accurately because the views are
> > assembled programmatically - it's dynamically generated based on the data
> > read in.
> >
> > On Fri, Mar 16, 2018 at 10:37 AM, Richard Charles <rcharles...@gmail.com
> >
> > wrote:
> >
> >>
> >>> On Mar 16, 2018, at 9:03 AM, David Catmull <davidcatm...@gmail.com>
> >> wrote:
> >>>
> >>> After I set up a somewhat complex view hierarchy, I'm getting a crash
> >> with
> >>> this exception:
> >>>
> >>> 2018-03-16 08:59:21.814873-0600 App[31201:13046721] *** Assertion
> >> failure
> >>> in -[NSLayoutConstraint setPriority:],
> >>> /BuildRoot/Library/Caches/com.apple.xbs/Sources/Foundation/
> >> Foundation-1451/Foundation/Layout.subproj/NSLayoutConstraint.m:222
> >>>
> >>> It happens on the main event loop where none of my code is involved; I
> >>> never set constraint priorities myself. What could be causing this
> error?
> >>
> >> Have you tried manually exercising the constraints? In Interface Builder
> >> drag the views into random positions and sizes then click "Update
> Frames”
> >> to force the constraint system to apply the constraints. This may
> uncover
> >> any errors you have in the constraints containted in the view hierarchy.

Re: NSLayoutConstraint crash

[David Catmull]

I might try it, but it's difficult to do accurately because the views are
assembled programmatically - it's dynamically generated based on the data
read in.

On Fri, Mar 16, 2018 at 10:37 AM, Richard Charles <rcharles...@gmail.com>
wrote:

>
> > On Mar 16, 2018, at 9:03 AM, David Catmull <davidcatm...@gmail.com>
> wrote:
> >
> > After I set up a somewhat complex view hierarchy, I'm getting a crash
> with
> > this exception:
> >
> > 2018-03-16 08:59:21.814873-0600 App[31201:13046721] *** Assertion
> failure
> > in -[NSLayoutConstraint setPriority:],
> > /BuildRoot/Library/Caches/com.apple.xbs/Sources/Foundation/
> Foundation-1451/Foundation/Layout.subproj/NSLayoutConstraint.m:222
> >
> > It happens on the main event loop where none of my code is involved; I
> > never set constraint priorities myself. What could be causing this error?
>
> Have you tried manually exercising the constraints? In Interface Builder
> drag the views into random positions and sizes then click "Update Frames”
> to force the constraint system to apply the constraints. This may uncover
> any errors you have in the constraints containted in the view hierarchy.
>
> --Richard Charles
>
>
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Re: NSLayoutConstraint crash

[David Catmull]

I found that in my googling, but since I'm not changing priorities, it
wasn't helpful.

On Fri, Mar 16, 2018 at 10:06 AM, Richard Charles <rcharles...@gmail.com>
wrote:

>
> > On Mar 16, 2018, at 9:03 AM, David Catmull <davidcatm...@gmail.com>
> wrote:
> >
> > After I set up a somewhat complex view hierarchy, I'm getting a crash
> with
> > this exception:
> >
> > 2018-03-16 08:59:21.814873-0600 App[31201:13046721] *** Assertion
> failure
> > in -[NSLayoutConstraint setPriority:],
> > /BuildRoot/Library/Caches/com.apple.xbs/Sources/Foundation/
> Foundation-1451/Foundation/Layout.subproj/NSLayoutConstraint.m:222
> >
> > It happens on the main event loop where none of my code is involved; I
> > never set constraint priorities myself. What could be causing this error?
>
> Perhaps this might help.
>
> https://books.google.com/books?id=JTxsAQAAQBAJ=PP51;
> lpg=PP51=Assertion+failure+NSLayoutConstraint+
> setPriority=bl=5hS5MqkC4F=RZENjGG10if2pqw9_RKTbJhTQQA&
> hl=en=X=0ahUKEwjJhrm6m_HZAhVM6WMKHU0wCogQ6AEIZjAI#v=
> onepage=false
>
> --Richard Charles
>
>
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NSLayoutConstraint crash

[David Catmull]

After I set up a somewhat complex view hierarchy, I'm getting a crash with
this exception:

2018-03-16 08:59:21.814873-0600 App[31201:13046721] *** Assertion failure
in -[NSLayoutConstraint setPriority:],
/BuildRoot/Library/Caches/com.apple.xbs/Sources/Foundation/Foundation-1451/Foundation/Layout.subproj/NSLayoutConstraint.m:222

It happens on the main event loop where none of my code is involved; I
never set constraint priorities myself. What could be causing this error?
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NSTableView drag image - using the first column image

[David Catmull]

In my table view, when you drag an item, the drag image it uses comes from
the column cell where the drag started, rather than using the cell from the
first column where I have the icon and name. How do I make it use the first
column?

I'm looking at Apple's TableViewPlayground as an example, and the outline
view there works like I want, and I can't see what the key difference is.

I'm tempted to try to fix it in tableView:updateDraggingItemsForDrag: but
the Apple sample only uses that to update the image for external drags. For
local drags, that method is essentially not used. If I comment that method
out, the first-column-image behavior I want still works in the sample.

I have a simple example at https://github.com/Uncommon/TableTest - notice
that dragging from different columns yields different drag images even
though the data in the drag is the same.
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Re: Are Core Data to-many relationships nullable?

[David Catmull]

Apparently the answer is that they should be declared nullable. Even though
I've seen claims that the property will always return a set, apparently
it's also allowable to assign it to nil to clear it out.

On Thu, Oct 5, 2017 at 1:00 PM, David Catmull <davidcatm...@gmail.com>
wrote:

> I'm adding nullability notations to my Core Data classes for Swift
> interoperability, and I need to know whether the properties for to-many
> relationships should be considered nullable, or if they will always read as
> empty sets. Is there an authoritative answer for this?
>
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Are Core Data to-many relationships nullable?

[David Catmull]

I'm adding nullability notations to my Core Data classes for Swift
interoperability, and I need to know whether the properties for to-many
relationships should be considered nullable, or if they will always read as
empty sets. Is there an authoritative answer for this?
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Window animates width but not height

[David Catmull]

I have a preferences window with a NSTabViewController hooked up to the
toolbar for selecting tabs. I want the window to be resizable, and to
resize iself if necessary when switching tabs to fit the new tab's size.

I'm subclassing NSTabViewController with the following overload:

override var selectedTabViewItemIndex: Int
{
  didSet
  {
guard let view = tabViewItems[selectedTabViewItemIndex].view,
  let window = view.window
else { return }

let minSize = view.fittingSize
let contentRect = NSWindow.contentRect(forFrameRect: window.frame,
   styleMask: window.styleMask)
let minRect = NSRect(origin: contentRect.origin, size: minSize)
let newRect = minRect.union(contentRect)
let newFrame = NSWindow.frameRect(forContentRect: newRect,
  styleMask: window.styleMask)

window.animator().setFrame(newFrame, display: true, animate: true)
  }
}
The result is that it animates resizing horizontally, and at the end of the
animation it suddenly resizes vertically as well. How do I get it to just
animate both directions at once?

Note - I posted this question to Stack Overflow a few days ago, but haven't
gotten any responses. Feel free to respond there if you'd like the rep
points :)  https://stackoverflow.com/q/46493460/310159
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Dealing with validModesForFontPanel signature change

[David Catmull]

In the 10.13 SDK, the return type for NSObject.validModesForFontPanel()
changed from Int to NSFontPanel.ModeMask. This is problematic for backwards
compatibility because the different signature means it's considered to be a
new function, different from the one that's been around since 10.3.

If I simply update my function to match the new signature, then I have to
change my deployment target to 10.13, which I'd rather not do just yet.

I also tried going with the auto-fix suggestion of using @available to make
the function 10.13 only. This would mean a minor loss of functionality on
10.12... but it doesn't work because my override isn't allowed to have
different availability from the base version.

I also tried installing the 10.12 SDK and building against that, but it's
not compatible with Xcode 9 GM's Swift 3.2.

So once I start using Xcode 9 regularly, I basically have to comment that
function out until I want to require 10.13 for my app. Are there any other
options?
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Process.launch() in Swift

[David Catmull]

The documentation for Process.launch() (the equivalent of -[NSTask launch])
says it "raises an NSInvalidArgumentException if the launch path has not
been set or is invalid or if it fails to create a process", and yet the
function is not marked as "throws". So what happens if I call it from Swift
and it encounters an error?

I'm thinking I should probably just call it from Objective-C to be safe.
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Re: Can't restore first responder when restoring window state

[David Catmull]

I looked through the documentation, and didn't see anything that says you
shouldn't call those methods. If they were meant to be overridden and not
called, I expect they'd use something more opaque and special-purpose than
NSCoder.

As for being called twice, I don't see a problem, since they'll just be
restored to the same values both times.

On Thu, Feb 16, 2017 at 1:22 PM, Quincey Morris <
quinceymor...@rivergatesoftware.com> wrote:

> On Feb 16, 2017, at 11:32 , David Catmull <davidcatm...@gmail.com> wrote:
>
>
> I am explicitly calling encodeRestorableState (in windowWillClose) and 
> restoreStateWithCoder
> (in windowDidLoad).
>
>
> You can’t. These methods — assuming you’re talking about overrides in
> (say) the window controller — are called by the state restoration system
> when it wants to. They’re there for you to override, not to call.
>
> If you do indeed call them, then they’re being called twice, at different
> times, which certainly sounds like it’s going to lead to problems.
>
>
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Re: Can't restore first responder when restoring window state

[David Catmull]

I am explicitly calling encodeRestorableState (in windowWillClose) and
restoreStateWithCoder
(in windowDidLoad), storing and reading the data to/from a file myself. I
know those are normally used as part of the automatic app state
restoration, but I want to restore a window's state regardless of whether
it was open when the application last quit.

I'm using encode/restoreState because it's an existing mechanism that seems
to suit my needs, and aside from this first responder thing it's working
fine.

Also, I'm assuming - though I haven't tested this yet and the docs don't
say - that the window state restoration will take into account changes in
the monitor configuration, ensuring that the window is restored to a
location that is still on screen. If there's a better way to do that I'm
open to it.

On Thu, Feb 16, 2017 at 11:52 AM, Quincey Morris <
quinceymor...@rivergatesoftware.com> wrote:

> On Feb 16, 2017, at 10:09 , David Catmull <davidcatm...@gmail.com> wrote:
>
>
> I'm working on using encodeRestorableState/restoreStateWithCoder to save
> and restore the state of a window. (I'm doing this manually because I want
> to explicitly save my window state in the document and not just rely on the
> OS restoring its state as part of restoring the application state.)
>
>
> It’s a while since I’ve had to wrestle with custom restoration, so maybe
> I’m missing something obvious, but I can’t quite come to grips with what
> you’ve said here.
>
> On the face of it, if you’re saving the window state in the document, you
> should not be using window restoration *at all*. Instead, you should simply
> configure the window back to how/where it should appear as part of the
> document opening process, after creating the window controller and before
> showing the window — in an override of NSDocument’s “makeWindowControllers”
> probably.
>
> If by "encodeRestorableState/restoreStateWithCoder” you mean the standard
> NSResponder methods, then the saved state is *not* saved in your document,
> and restoration likely happens — or at least starts — before your
> NSDocument instance exists. You then fall into a timing and state
> consistency hole (the window being restored is created early in app
> startup, the document information is available later), so I don’t find it
> entirely surprising that an error occurs.
>
> If I’m off track here, can you clarify what you’re trying to do with the
> actual state restoration mechanism, if it’s not to save/restore its own
> state data?
>
>
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Can't restore first responder when restoring window state

[David Catmull]

I'm working on using encodeRestorableState/restoreStateWithCoder to save
and restore the state of a window. (I'm doing this manually because I want
to explicitly save my window state in the document and not just rely on the
OS restoring its state as part of restoring the application state.)

The problem I'm having is that when it restores, an error is logged in the
console that it can't restore the first responder because the view in
question has its window set to nil.

I tried calling makeFirstResponder(nil) before encoding, but then the
window is its own first responder and an exception is thrown because it
can't encode itself.

I'm doing this from my window controller's windowDidLoad. Doing it in
awakeFromNib didn't make a difference.

So is there a way I can either prevent the window from saving/restoring the
first responder, or ensure that the first responder view is installed in
the window first?
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Xcode-like title bar using title bar accessory view

[David Catmull]

I'm trying to create a title bar resembling Xcode's, where toolbar-like
controls replace the standard window title in the area to the right of the
standard 3 buttons.

So far, I've added a title bar accessory view and set the window's
titleVisibility to hidden. But the results aren't quite right.

If my accessory view uses the default layoutAttribute value of .bottom,
then my accessory view appears below the standard window controls as if it
were a toolbar.

If I set the layoutAttribute to .right, then the accessory view appears up
in place of the title where I want it, except the title bar isn't tall
enough and the bottom gets cut off. Also, the accessory view is pinned to
the right, and doesn't resize horizontally with the window (as it does with
.bottom). Similarly with .left.

So how to I get my title bar accessory view to:
- Appear to the right of the standard window buttons
- Always fill the remaining width of the title bar
- Get enough vertical space
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Re: Unit testing with mixed Swift & Objective C

[David Catmull]

I found another solution: set the header search paths in the test target so
it can find the App-Swift.h file from the app target, include that in the
ObjC tests that need the Swift classes (instead of the one generated for
the test target), and then remove all the app Swift files from the test
target.

Using an auto-generated header from another target is kind of a hack, but
it works, and it's the simplest solution so far, so I'm going with it for
now.

On Sun, Jul 17, 2016 at 2:16 PM, David Catmull <davidcatm...@gmail.com>
wrote:

> After converting some parts of my project to Swift, I've run into some
> problems with my tests.
>
> The first problem was where an app (not test) function, in Swift, was
> iterating over an NSArray of instances of a Swift class, because that array
> was generated by Objective C code. It was throwing an exception because the
> objects were of the wrong type. I eventually figure out that it was because
> my Swift files are in both the app and test targets, so there are two
> versions of each Swift class.
>
> For Swift tests, I understand that you're now supposed to not have your
> Swift sources in the test target, and instead use "@testable import
> MyAppModule". But what about test written in Objective C that need to
> access my Swift classes? If they're not in the test target, they won't be
> in AppTest-Swift.h. Is there some other way to generate a Swift header file?
>
> Without that, I'm looking at two alternatives for the NSArray iterating
> scenario:
> - Rewrite the function that does the iterating, using Objective C so that
> it doesn't do the type checking.
> - Rewrite the function that creates the array, using Swift so that
> hopefully the classes will match.
>
> Any other recommendations?
>
> --
> David Catmull
> davidcatm...@gmail.com
> http://uncommonplace.com
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Unit testing with mixed Swift & Objective C

[David Catmull]

After converting some parts of my project to Swift, I've run into some problems 
with my tests.

The first problem was where an app (not test) function, in Swift, was iterating 
over an NSArray of instances of a Swift class, because that array was generated 
by Objective C code. It was throwing an exception because the objects were of 
the wrong type. I eventually figure out that it was because my Swift files are 
in both the app and test targets, so there are two versions of each Swift class.

For Swift tests, I understand that you're now supposed to not have your Swift 
sources in the test target, and instead use "@testable import MyAppModule". But 
what about test written in Objective C that need to access my Swift classes? If 
they're not in the test target, they won't be in AppTest-Swift.h. Is there some 
other way to generate a Swift header file?

Without that, I'm looking at two alternatives for the NSArray iterating 
scenario:
- Rewrite the function that does the iterating, using Objective C so that it 
doesn't do the type checking.
- Rewrite the function that creates the array, using Swift so that hopefully 
the classes will match.

Any other recommendations?

-- 
David Catmull
davidcatm...@gmail.com
http://uncommonplace.com
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Re: Sidebar outline view, rowSizeStyle, and bold text

[David Catmull]

OK, thanks. I wasn't thinking of bold being affected by row size, but I
guess it makes sense that it's going to reset the font entirely.

On Fri, Jun 10, 2016 at 10:46 AM, corbin dunn <corb...@apple.com> wrote:

>
> On Jun 10, 2016, at 7:58 AM, David Catmull <davidcatm...@gmail.com> wrote:
>
> I have a view-based, sidebar-style NSOutlineView. For some items, I want to
> make the text bold. But if I change the rowSizeStyle to medium instead of
> the default (in awakeFromNib), the text doesn't display as bold. If instead
> I use a custom row size (in outlineView:heightOfRowByItem:) it works. What
> gives?
>
>
> Let’s take a look at the header :)
>
> typedef NS_ENUM(NSInteger, NSTableViewRowSizeStyle) {
> /* The table will use the system default layout size: small, medium
> or large. */
> NSTableViewRowSizeStyleDefault = -1,
>
>
> /* The table will use the -rowHeight or ask the delegate for a
> variable row height (if implemented) and cell layout is not changed. */
> NSTableViewRowSizeStyleCustom = 0,
>
>
> /* The table will use a row height specified for a small/medium or
> large table.
>  It is required that all sizes be fully tested and supported if
> NSTableViewRowSizeStyleCustom is not used.
> * Some standard Aqua metrics may be applied to cells based on the
> current size. */*
> NSTableViewRowSizeStyleSmall = 1,
> NSTableViewRowSizeStyleMedium = 2,
> NSTableViewRowSizeStyleLarge = 3,
> } NS_ENUM_AVAILABLE_MAC(10_7);
>
>
> So, if you set it to Small/Medium/Large then you will get some standard
> metrics applied to things. Specifically, things setup to these outlets on
> an NSTableCellView:
>
> @property (nullable, assign) IBOutlet NSTextField *textField;
> @property (nullable, assign) IBOutlet NSImageView *imageView;
>
>
>
>
>
> corbin
>
>
>
>
>
>
> I'm setting it to bold in outlineView:viewForTableColumn:item: by setting
> view.textField.font = NSFont boldSystemFontOfSize
> :view.textField.font.pointSize].
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Sidebar outline view, rowSizeStyle, and bold text

[David Catmull]

I have a view-based, sidebar-style NSOutlineView. For some items, I want to
make the text bold. But if I change the rowSizeStyle to medium instead of
the default (in awakeFromNib), the text doesn't display as bold. If instead
I use a custom row size (in outlineView:heightOfRowByItem:) it works. What
gives?

I'm setting it to bold in outlineView:viewForTableColumn:item: by setting
view.textField.font = NSFont boldSystemFontOfSize
:view.textField.font.pointSize].
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Re: PDF image template comes out too small

[David Catmull]

OK, if I open the PDFs in Preview, it says that the icons are 8x8 pts
instead of 16x16. Exporting at a different DPI in Designer doesn't change
this, but if I export from a document that itself has a different DPI (72
vs 144), then that can fix it. So I guess I have at thing or two to learn
about working with Affinity Designer.

On Wed, Jun 1, 2016 at 12:30 PM, Quincey Morris <
quinceymor...@rivergatesoftware.com> wrote:

> On Jun 1, 2016, at 10:55 , David Catmull <davidcatm...@gmail.com> wrote:
>
>
> On OS X. I have an NSSegmentedControl in my xib, with my template images
> assigned to the segments by specifying the image names.
>
>
> It’s a bit hard to tell what’s going on if it’s all done in IB. You might
> consider adding code to examine the images on the segments to see what’s
> going on.
>
> I would try re-exporting the PDFs at a larger size (say 192 x 192, which
> is a factor of 12). There may be an issue scaling the PDF *up* to get a
> retina resolution of 32 x 32 px for 16 x 16 pt.
>
> This is going to be a problem if you really want the images to be 16 x 16
> pt regardless of the size of the control. If that is the case, I think it’s
> better to provide them in an image catalog with 1x, 2x and/or 3x as
> necessary.
>
>
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Re: PDF image template comes out too small

[David Catmull]

On OS X. I have an NSSegmentedControl in my xib, with my template images
assigned to the segments by specifying the image names.

On Wed, Jun 1, 2016 at 10:36 AM, Quincey Morris <
quinceymor...@rivergatesoftware.com> wrote:

> On Jun 1, 2016, at 07:51 , David Catmull <davidcatm...@gmail.com> wrote:
>
>
> I'm trying to use PDF files as image templates for my segment controls, but
> they come out too small.
>
>
> What platform? What does “use” mean? That is, are you creating
> NSImage/UIImage objects, drawing them into bitmaps, using CGPDF… functions,
> etc?
>
>
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PDF image template comes out too small

[David Catmull]

I'm trying to use PDF files as image templates for my segment controls, but
they come out too small.

I created them using Affinity Designer, adding the "Template" suffix. They
end up getting drawn at half size in my controls. I tried changing the
export DPI from the default (~144) to 72, but it had no effect.

Exporting them as png instead works fine - at runtime, that is. Xcode
7.3.1's editor shows them at half size like the PDFs. This only happens
with my custom images, never with standard system images.

The images are 16x16, exported using Designer's "PDF (flatten)" setting. My
segment control is "small square" style, with 37px wide segments.

How can I make them display at the right size? I can make do with pngs if
necessary, but for one thing I like not having to have @2x versions of
everything. Plus Apple's documentation recommends PDF for template images,
so it ought to work.
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Re: Proper target for table cell view buttons

[David Catmull]

> On Apr 8, 2016, at 10:48 AM, Quincey Morris 
>  wrote:
> 
> You could verify this by simply removing the target connection that’s causing 
> the warning, and see if the action method still ends up in the right place.

As has been pointed out, removing the target connection in the nib also removes 
the action. Setting the action at runtime, and leaving the target nil, results 
in the action method not getting called.
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Re: Proper target for table cell view buttons

[David Catmull]

On Apr 7, 2016, at 1:23 PM, Quincey Morris 
 wrote:
> I don’t actually know the answer to the original question, but I wonder if 
> the problem is that (for a view-based table view) the cell view is archived 
> in a separate NIB file that’s generated when the storyboard or XIB containing 
> the table view is compiled. Then, there would be a difficulty that objects in 
> the NIB have no way to connect to anything outside the NIB except via File’s 
> Owner, and that’s set to something else.

I don’t see any additional nib files in the application package.

> Perhaps "it works as is” because there’s actually no target, so the action 
> message passes up the responder chain to the view controller. In that case, 
> there isn’t any need to find a way to specify the target explicitly.

From what I see in the debugger, that doesn’t seem to be happening, although it 
goes through something called os_activity_initiate and I suppose it’s possible 
the responder chain is being traced in there.


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Re: Proper target for table cell view buttons

[David Catmull]

On Apr 7, 2016, at 11:45 AM, Fritz Anderson  wrote:
> 
> I’m curious about two things.
> 
> (1) Which platform?

OS X 10.11.3

> (2) Is your view controller not a table delegate already?

I currently have the data source as the delegate, mainly because to me it makes 
more sense to have the delegate method outlineView:viewForTableColumn:item in 
the data source. The data source is a separate object from the view controller 
because I have different modes for the table, which I implement partly by 
switching data sources.
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Proper target for table cell view buttons

[David Catmull]

I have some buttons in my table cell views, and I wanted to set my view 
controller as their target, but Xcode warns that such objects “may only be 
connected to the table view’s delegate”. The things is, it works as is. Why 
does Xcode want me to do it that way?

I plan to try refactoring to satisfy the warning, but I’m still curious what 
the reasoning is.
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Re: Does NSOutlineView's highlightedTableColumn work?

[David Catmull]

> Are you sure a (rather small) sort indicator didn't appear in the column's 
> header?  

No, nothing appeared there either.

>> I’m trying to use the column highlight to indicate a view state unrelated to 
>> sorting…
> 
> Don't do that.  Don't try to hijack features intended for one semantic for 
> another.  

I don't think the intended use of highlightedColumn is sufficiently clear in 
the docs. I'll submit feedback to Apple about that.

> If you're using a view-based outline view, try using a custom table row view 
> that overrides -drawBackgroundInRect:.

It seems like that would only give me a background in non empty rows. My next 
idea was to subclass NSOutlineView and override drawBackgroundInRect on that.
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Does NSOutlineView's highlightedTableColumn work?

[David Catmull]

Is setting the highlightedTableColumn property on an NSOutlineView supposed to 
work? I’m expecting the column background to darken, but nothing seems to 
happen.

Showing the column headers didn’t help (I normally have them hidden), and 
neither did setting a sort key for the column. I’m trying to use the column 
highlight to indicate a view state unrelated to sorting, but I figured since 
that’s what it’s normally used for it might want a sort key. Anyway, that 
didn’t work, and I can’t think of any other settings that might be helpful.
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Detecting screen capture in progress

[David Catmull]

How can I detect when a screen shot selection (cmd-shift-4) is in progress?

I have a custom window that I’m trying to make behave like a menu (it comes out 
of a status item). Part of this behavior is dismissing it when the user clicks 
on something else, which I detect using a CGEventTap. One case where I *don’t* 
want a click to dismiss is when it’s the start of a screen shot selection. Is 
there any way to detect this?
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Full-height toolbar items

[David Catmull]

I'm working on a library for doing full-height toolbar items, like the center 
status display in Instruments, Xcode, and iTunes. I'm not completely finished 
yet, but I have reached a point where I'd like to share it. Feedback is welcome.

https://github.com/Uncommon/UUFullHeightToolbar
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toolbar:itemForItemIdentifier:willBeInsertedIntoToolbar: and nibs

[David Catmull]

The documentation for toolbar:itemForItemIdentifier:willBeInsertedIntoToolbar: 
says that it's optional for nib toolbars, but it can still be used to augment 
functionality. My experience is that it actually doesn't get called at all in 
the nib case, which isn't good because I want to know if my items are going 
into the toolbar or the customize palette. All my delegate is getting is 
toolbarWillAddItem:, which isn't enough.

Are the docs wrong, or am I doing it wrong?
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Re: toolbar:itemForItemIdentifier:willBeInsertedIntoToolbar: and nibs

[David Catmull]

On Jun 12, 2013, at 5:14 PM, Keary Suska cocoa-...@esoteritech.com wrote:
 Also, I suspect that the docs you cite might be saying that you would 
 subclass NSToolbar and implement that delegate method if you want to 
 intercept it.

If I implement that method in a subclass, then it gets called with toolbar and 
itemIdentifier set to nil, and the flag is YES even though it's setting up the 
customize sheet. So it's interesting that it gets called at all, but it's still 
strangely useless.
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PDF icons scaled wrong on retina displays

[David Catmull]

As recommended, I used PDF images for some of my button icons with the 
expectation that they would look nice on retina displays. They are nice and 
smooth, but they're also scaled a bit smaller than on a regular display.

Example:
http://dl.dropbox.com/u/10822169/Screen%20Shot%202012-10-12%20at%203.20.53%20PM.png

The left and middle icons are mine, and the right one is NSPathTemplate.

My PDFs (generated by Inkscape) are here:
https://github.com/Uncommon/Xit/blob/master/Xit/images/historyTemplate.pdf
https://github.com/Uncommon/Xit/blob/master/Xit/images/stageTemplate.pdf

Is there a problem with Inkscape's output? Do I need to change my button 
settings, or reprocess the PDFs somehow? Will I have to use @2x raster images 
instead?
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Re: Icon Overlay on Mac OSX

[David Catmull]

Uli Kusterer witness.of.teacht...@gmx.net wrote:
 In the old days, one could use Icon Services calls to change the icon used 
 for a particular file type, that might even save you the renaming, but Icon 
 Services is probably considered old API these days, and I'm not sure if 
 changes to icons in your app using Icon Services will still affect Finder. 
 Anyway, it's worth a try.

That worked back in Mac OS 9, but as of Mac OS X, changing icons like that 
doesn't affect other applications.
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Re: Full-Height Toolbar Item

[David Catmull]

On Jan 26, 2012, at 9:03 PM, Mark Alldritt alldr...@latenightsw.com wrote:
 I'm looking for a way to make a view-based Toolbar Item that occupies the 
 full height of the toolbar (i.e. including the space normally reserved for 
 the toolbar item's label).  Xcode 4 does this for its status display, and I 
 have a similar need in my application.  The NSToolbar and NSToolbarItem 
 definitions don't appear to make this possible, but perhaps there is 
 something I've overlooked.


I've looked into this too, and haven't found an answer yet. According to this 
article, Xcode used to use a floating window trick:
http://stackoverflow.com/questions/6169255/is-it-possible-to-draw-in-the-label-area-of-nstoolbar

..but it doesn't anymore. Also note that Instruments has a full-height toolbar 
item, and that toolbar is fully customizable, so whatever tricks they're using 
they were able to make it behave like a normal toolbar item - cmd-draggable, in 
customize sheet, etc.
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Re: Full-Height Toolbar Item

[David Catmull]

On Jan 27, 2012, at 12:27 PM, Jens Alfke wrote:
 The good news is that these APIs often become public in later OS releases, 
 especially if developers file bugs clamoring for them (hint hint).

Done: bug 10766939.

-- 
David Catmull
uncom...@uncommonplace.com



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Status toolbar item like Xcode and Instruments

[David Catmull]

I'm interested in implementing a status display in my toolbar, similar to the 
LCD-style ones seen in Xcode 4 and Instruments. The challenge seems to be how 
to make it a full-height item with no label. If I make my custom view taller, 
it just makes the whole toolbar taller. Setting the label to nil or @ just 
leaves the label area blank.

I had read* that Xcode uses sneaky hacks for its status display, and I was 
resigned to having to reproduce that approach. Then I noticed the one in 
Instruments, which behaves like a normal toolbar item in many respects, 
including the Customize sheet. This leads me to suspect there's a relatively 
non-messy way to implement this.

* 
http://stackoverflow.com/questions/6169255/is-it-possible-to-draw-in-the-label-area-of-nstoolbar

-- 
David Catmull
uncom...@uncommonplace.com


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Re: Help with view constraints

[David Catmull]

On Oct 28, 2011, at 6:30 PM, Ken Ferry wrote:
 The question seems a little general to me.  Where did you have problems doing 
 what you wanted to do?

To be more specific, the window contains two controls: a text field with the 
full command arguments for a git command that was executed, and below it a 
scrolling text box containing the output from the command. I want the command 
field to resize vertically as needed when that text changes, while manual 
resizing by the user should only affect the output box.

If you really want to get into it, the source is here: 
https://github.com/Uncommon/Xit/tree/status
It's a rewrite of the GitX git client.

-- 
David Catmull
uncom...@uncommonplace.com
http://www.uncommonplace.com/

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Source list groups hidden by default

[David Catmull]

I have a source list in my window - an NSOutlineView where my delegate returns 
YES for outlineView:isGroupItem: for certain items. In 10.7, group items now 
have a Show/Hide button that appears on mouse-over. The complication is that 
for some reason my groups are hidden by default. I can expand them 
programmatically, but that doesn't work if the group is empty. I could expand 
it when I add children, but then I have to keep track of whether it's for the 
first time or if I'm just refreshing. So how do I make my groups shown by 
default?

-- 
David Catmull
uncom...@uncommonplace.com
http://www.uncommonplace.com/

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Full-height toolbar item

[David Catmull]

How can I make a toolbar item that takes up the full height of the toolbar, 
including the space where the label would normally be? Simply setting the label 
to an empty string doesn't seem to do it. I want to make something like Xcode 
4's status display.

-- 
David Catmull
uncom...@uncommonplace.com
http://www.uncommonplace.com/

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Contextual menu commands in the Finder

[David Catmull]

So I gather that now that the new 64-bit Finder doesn't support the old CM 
plugin API, the only way to add commands to the Finder's contextual menus is 
with the services API. The problem I'm having with doing it as a service is 
that the commands I want to add should only apply to files in certain 
locations, and it looks like I can only filter by file type. Is there no way to 
filter by location too? 

It looks pretty lame to have to let the commands always appear, and then tell 
the user afterwards, No, sorry, you can't really do this to that file.

-- 
David Catmull
uncom...@uncommonplace.com


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Animated progress bar in custom menu item view

[David Catmull]

I'm looking a the MenuItemView sample code:
http://developer.apple.com/library/mac/#samplecode/MenuItemView/Introduction/Intro.html

This sample shows various views and controls in a menu, including an 
indeterminate progress bar - but it doesn't animate (even though startAnimation 
is called). I assume this worked when the code was first released, apparently 
in the 10.4 days, but in 10.5 and 10.6 it doesn't. What has changed, and what 
would it take to fix the sample?___

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Re: Core Data: many-to-many relationships not being saved

[David Catmull]

I finally found the answer to this problem. It comes from the way I was setting 
the relationship. I was calling:

  [[expense valueForKey:@tags] addObject:tag];

..which apparently is too direct. What I need is something more like:

  [[expense mutableSetValueForKey:@tags] addObject:tag];


I discovered the answer as I was preparing to post my question on Stack 
Overflow. It was yet another case of trying to anticipate all the obvious did 
you try this responses, and finding the answer myself in the process.

On Jul 10, 2010, at 9:03 AM, David Catmull wrote:

 In my finance app, I have Expense and Tag entities with many-to-many 
 relationships to each other. But changing those relationships doesn't mark 
 the document as dirty, and the changes don't get saved. It doesn't seem to 
 matter if the relationships are optional or not, and they're not transient. 
 This is the first time I've had trouble with object relationships. What could 
 be causing it?
 
 The project is on GitHub if you want to try it out:
 http://github.com/Uncommon/Budget-Machine
 
 -- 
 David Catmull
 uncom...@uncommonplace.com
 http://www.uncommonplace.com/
 


-- 
David Catmull
uncom...@uncommonplace.com
http://www.uncommonplace.com/

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Core Data: many-to-many relationships not being saved

[David Catmull]

In my finance app, I have Expense and Tag entities with many-to-many 
relationships to each other. But changing those relationships doesn't mark the 
document as dirty, and the changes don't get saved. It doesn't seem to matter 
if the relationships are optional or not, and they're not transient. This is 
the first time I've had trouble with object relationships. What could be 
causing it?

The project is on GitHub if you want to try it out:
http://github.com/Uncommon/Budget-Machine

-- 
David Catmull
uncom...@uncommonplace.com
http://www.uncommonplace.com/

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Re: C arrays as __block variables

[David Catmull]

I had a situation where I was accessing a C array from inside a block. It 
worked fine until I upgraded to Xcode 3.2.3; then I started to get errors.

-- 
David Catmull
uncom...@uncommonplace.com
http://www.uncommonplace.com/

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Core Data: binding to a sum

[David Catmull]

How do I make a table view column show a sum calculated from Core Data Values?

I have a Budget entity with a to-many relationship of BudgetItems. In a table 
view listing my budgets, I want a column that displays the total of a budget's 
items' amounts.

I tried binding the column to ite...@sum.limit, but got this error:
Unknown.m:0: error: -[BudgetTests testBudgetSheet] : [_NSFaultingMutableSet 
0x102e28500 addObserver:forKeyPath:options:context:] is not supported. Key 
path: @sum.limit
..so I take it the particular NSSet variant used by Core Data doesn't support 
observing @sum. Or did I do that wrong?

I also tried implementing keyPathsForValuesAffectingTotal on my budget class to 
return items.limit, but that didn't get me any notifications when things 
changed.

The next thing on my agenda is to try manually observing all changes to 
BudgetItems, but I'm struggling with the best way to do that.

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David Catmull
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Re: Core Data: binding to a sum

[David Catmull]

On Apr 7, 2010, at 10:19 AM, Keary Suska wrote:
 On Apr 7, 2010, at 9:14 AM, David Catmull wrote:
 ..so I take it the particular NSSet variant used by Core Data doesn't 
 support observing @sum. Or did I do that wrong?
 
 Yes, because you are trying to observe an element of a set. Same goes for 
 arrays. Instead, add an array controller whose content is bound to items, 
 and bind to arrangedObjects-@sum.limit.


Thanks! I'm used to just thinking of array controllers as a way to feed table 
views. This did the trick.

David Catmull
uncom...@uncommonplace.com



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Re: Make sheets open instantly

[David Catmull]

On Jan 18, 2010, at 5:19 PM, Chris Hanson wrote:
 On Jan 18, 2010, at 2:43 PM, David Catmull wrote:
 
 Is there any way to make sheets open instantly, instead of animating? I'd 
 just like to speed up my unit tests.
 
 Why do your unit tests need to bring up sheets?

I'll just call them tests then.

-- 
David Catmull
uncom...@uncommonplace.com
http://www.uncommonplace.com/

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Make sheets open instantly

[David Catmull]

Is there any way to make sheets open instantly, instead of animating? I'd just 
like to speed up my unit tests.

-- 
David Catmull
uncom...@uncommonplace.com
http://www.uncommonplace.com/

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Re: Core Data derived property not recognized after save reopen

[David Catmull]

Follow-up to my own question:

I decided that since the year and month derived properties were only there for 
fetch requests, the correct thing to do is to get rid of them and instead use 
predicates that look for the corresponding date ranges. That works just as 
well, and avoids the derived property weirdness entirely.

-- 
David Catmull
uncom...@uncommonplace.com
http://www.uncommonplace.com/

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Re: Core Data derived property not recognized after save reopen

[David Catmull]

On Nov 18, 2009, at 2:13 PM, Sean McBride wrote:
 What do you mean exactly by derived properties?  Are they transient?
 Are they in your xcdatamodel?  In any case, I believe your problem is
 that you can only fetch against properties that are in the persistent
 store ie in your xcdatamodel and not transient.

I subclassed NSManagedObject and just added year and month methods. What 
confuses me is the sequence of events that leads to the failure - it works 
after reopening the document, *until* I make a change.

In any case, I've gotten around this by dropping the derived property approach 
and using predicates that access the original date property directly.

-- 
David Catmull
uncom...@uncommonplace.com
http://www.uncommonplace.com/

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Core Data derived property not recognized after save reopen

[David Catmull]

I have an entity with a date property, and derived properties year and 
month (by having year/month methods in my NSManagedObject subclass). In a 
couple of different places, I fetch the entries from a particular year or 
month- the fetch requests's predicate says year == 2009. 

This works fine except in a document that has been saved and reopened: the 
first time I make a change to an object, and then try to fetch a list of 
objects by year, an exception is thrown saying keypath year not found. What 
confuses me is that between reopening the document, and making a change, I can 
make (as far as I can tell) the same request to filter by year (or month) 
without problems. It doesn't matter which property I change - date or anything 
else.

So I have two questions:
1. Why would this happen?
2. What's a good, simple way to write a unit test that simulates closing an 
reopening a Core Data document? I want to avoid actual file operations for the 
sake of simplicity, but NSPersistentDocument does not implement the 
dataOfType:error: method.

-- 
David Catmull
uncom...@uncommonplace.com
http://www.uncommonplace.com/

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Bindings vs MOC change notification

[David Catmull]

In my Core Data app, I have objects with a date property, and I want to 
maintain a list of all years that I have objects in. I'm having trouble 
settling on an approach.

Currently, I'm listening for 
NSManagedObjectContextObjectsDidChangeNotification. This is working fine for 
additions and deletions, but it's harder for changes, mainly because I don't 
know the old value. If I did, I could check if the old year still has any other 
objects in it. As it is I have to refresh the whole list. I also get more 
notifications than I need, since I only care about date changes on this one 
entity.

Another option is to use KVO so I can be notified only of date changes. I'm 
assuming that registering as an observer for potentially thousands of Core Data 
objects doesn't carry too much overhead. The down side is that if lots of 
objects change at once, I get lots of individual callbacks, and I worry that 
that would be a bottleneck.

Recommendations? Other options?

Thanks,

-- 
David Catmull
uncom...@uncommonplace.com
http://www.uncommonplace.com/

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Unit test crash inside NSTableView

[David Catmull]

I'm getting a crash in -[NSTableView _isGroupRow:] in my unit tests if I try to 
run the main run loop.

In my document's window, I have an NSOutlineView with its delegate and 
dataSource set to the window controller. In some unit tests, I want to run the 
main event loop to give some bindings a chance to do their thing, but this 
causes a crash. Once, instead of crashing, there was a message logged that some 
random class (whose name I can't remember) doesn't respond to 
-[outlineView:isGroupItem:], as if the outline view's delegate were set wrong. 
I added a check for that in the unit test and it was fine. When I run the app 
normally everything works.

I create the document by calling [[NSDocumentController 
sharedDocumentsController] openUntitledDocument:YES error:e]. Is there 
something else I need to do so that everything get set up correctly?

-- 
David Catmull
uncom...@uncommonplace.com
http://www.uncommonplace.com/

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NSArrayController inside NSTreeController?

[David Catmull]

How would I use an NSArrayController to provide the content of one of  
the child items in an NSTreeController?


This is for a NSOutlineView source view, and each group in the source  
view contains different kinds of items. In some cases, I want them to  
be Core Data items, so the easiest way to manage that is to use an  
array controller.


I tried returning the array controller's arrangedObjects as the  
children of a group object, but when items are added they don't appear  
in the source view. I'm not sure where to go from there.


--
David Catmull
uncom...@uncommonplace.com
http://www.uncommonplace.com/

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Re: NSArrayController inside NSTreeController?

[David Catmull]

On Nov 4, 2009, at 10:21 AM, Matthew Lindfield Seager matt...@sagacity.com.au 
 wrote:

You may need to implement NSOutlineView's data source methods.



I considered that, but I'm hoping to avoid having to re-implement all  
the stuff that already works in the normal table view/array controller  
case.


--
David Catmull
uncom...@uncommonplace.com
http://uncommonplace.com

. There
have been at least two discussions of this on the list in the past
three months so those threads might be helpful to you!

If you come up with a better solution please post your approach  
though!


Matt

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