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Re: GORM and NSCollectionView


From: Alessandro Sangiuliano
Subject: Re: GORM and NSCollectionView
Date: Fri, 6 Mar 2015 10:16:23 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Icedove/31.3.0

Il 05/03/2015 22:58, Fred Kiefer ha scritto:
I used gdb to get the full stack trace form Gorm. The problem happens
when line 161 in NSCollectionView.m tries to get the item 0 while there
isn't any item in the subview list.

The issue that causes this strange behaviour seem to be the MIN macro.
I added the following line before the loop:

   NSLog(@"first %d last %d %d %d %d", firstIndexInRect, lastIndexInRect,
[_items count] - 1, [self _indexAtPoint: oppositeOrigin], MIN(-1, 12));

This prints:

2015-03-05 22:40:31.307 Gorm[2624:2624] first 0 last 12 -1 12 -1

lastIndexInRect is 12 while it should be -1, but doing the same MIN call
with constants gives the correct result. When I extract the count to a
variable first and use that it also works. This definitely seems to be
compiler magic, most likely it gets the type of the count method as
NSUInteger and uses [_items count] - 1 also as unsigned.

I fixed this and hope that your application now works on GNUstep.

Fred



Am 03.03.2015 um 13:30 schrieb Alessandro Sangiuliano:
Hello, some days ago I wrote a little App to practice with
NSCollectionView.
I wrote it on OS X 10.6.8 XCode 3.2.2 and the relative IB; I ported the
App on GNUstep and when I try to open the nib or the xib file with GORM,
it is saying that:

"Problem Loading
Failed to load file. Exception: Index 0 is out of range 0 (in
'objectAtIndex:')
"

Last GORM update from the svn: Today.

I need this little App on GNUstep because I'll switch my little Calendar
App to NSCollectionView as soon as I can and I'd like to have it on
GNUstep, because I need specifically on GNUstep.

However, if I try to run the App without modify the nib file, it runs, but:

1) If I try to resize the window, it becomes totally black and the App
is not usable.
2) If i click on the button "Add Student", it adds nothing. (It should
add a view)

To implement the GUI, I used IB facilities for Cocoa bindings.

On OS X (10.6.8 and 10.10 too) the App behaves as expected.

The code is on github if you want to give a look. It's possible to try
it with XCode (3.2.2, and probably it also works for XCode 6 because I
have the same implementation on 10.10 and I did not remember differences
on the implementation) or with GNUstep.

https://github.com/AlessandroSangiuliano/NSCollectionView.git

Best regards,
Alex.


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First thing, thanks for the fix;
now I split the problem in 2 pieces, what fixed and and works, what still doesn't work.

What the fix, fixed:

1) I can open the nib file with GORM regurarly now, so it works.
2) If I run the CollectionViewApp targetin the nib file in the GNUmakefile, now I can resize regurarly w/o getting the window to become black and not usable. So it works

What still doesnt work (On all this passages I don't modify the internal nib elements like views and buttons):

1) If I open the nib file with GORM and then I save it as .gorm file, w/o any modification, when I try to open the .gorm file with GORM what I get is:

"Problem Loading.
Failed to load file.  Exception: Range: (28496, 1) Size: 28496"

Does GORM know about bindings?

2) If I target the .gorm file in the GNUmake file (and I do al the necessary configurations to get the .gorm loaded at startup) what I get is:

"Is not possible to load the main model file "MainMenu" (the translation could be not precise)

3) If I target the nib file in the GNUmake file, what I get running the app is:

"2015-03-06 10:09:16.487 CollectionView[7953] [NSConstantString-stringByAppendingPathExtension:] cannot append extension 'gorm' to empty string

2015-03-06 10:09:16.487 CollectionView[7953] [NSConstantString-stringByAppendingPathExtension:] cannot append extension 'gmodel' to empty string

2015-03-06 10:09:16.487 CollectionView[7953] [NSConstantString-stringByAppendingPathExtension:] cannot append extension 'nib' to empty string

2015-03-06 10:09:16.487 CollectionView[7953] [NSConstantString-stringByAppendingPathExtension:] cannot append extension 'xib' to empty string

2015-03-06 10:09:16.536 CollectionView[7953] No binding exposed on h=-&- v=-&- <NSCollectionView: 0x1a22e00> f={x = 0; y = 0; width = 474; height = 300} b={x = 0; y = 0; width = 474; height = 300} for content"

Ignoring the "[NSConstantString-stringByAppendingPathExtension:]" output , the interesting one is :

"2015-03-06 10:09:16.536 CollectionView[7953] No binding exposed on h=-&- v=-&- <NSCollectionView: 0x1a22e00> f={x = 0; y = 0; width = 474; height = 300} b={x = 0; y = 0; width = 474; height = 300} for content"

4) While the App is running clicking on the Add Student Button, nothing happens, it should add an item view to the NSCollectionView, I think this is a consequence og the third point.

Thank You again,

Best Regards,
Alex



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