Re: [Rubycocoa-talk] copyWithZone

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copyWithZone: is part of the NSCopying protocol, which NSObject  
doesn't implement but NSCell does.

http://developer.apple.com/documentation/Cocoa/Reference/Foundation/Protocols/NSCopying_Protocol/Reference/Reference.html

Laurent

On Aug 4, 2007, at 6:05 PM, Eloy Duran wrote:

> Hey Lrz,
>
> That would have been very nice! :)
> However unfortunately NSObject doesn't implement copyWithZone...
>
>>> foo = OSX::NSObject.alloc.init
> => #<OSX::NSObject:0x2e00e class='NSObject' id=0x159ac60>
>>> foo.objc_methods.grep(/zone/i)
> => ["zone"]
>
> Eloy
>
> On 8/4/07, Laurent Sansonetti <lsa...@ap...> wrote:
>> Try:
>>
>>   def copyWithZone(zone)
>>     copy = super_copyWithZone(zone)
>>     # set your attributes to copy
>>     # ex:
>>     #    copy.title = self.title
>>     return copy
>>   end
>>
>> Laurent
>>
>> On Aug 4, 2007, at 5:53 PM, Eloy Duran wrote:
>>
>>> Hello,
>>>
>>> I'm trying to write my own custom NSCell for a tableview.
>>> However, the table view tries to call #copyWithZone on my objects,
>>> which are subclasses of NSObject. So I was trying to create a  
>>> working
>>> #copyWithZone, but no matter what I do it always crashes  
>>> immediately.
>>> For instance I have the following, but it doesn't even write to the
>>> console:
>>>
>>> def copyWithZone(zone)
>>> puts 'COPY!'
>>> copy = Download.allocWithZone(zone).init
>>> self.instance_variables.each do |iv|
>>>   copy.instance_variable_set iv, self.instance_variable_get(iv)
>>> end
>>> return copy
>>> end
>>>
>>> Backtrace:
>>>
>>> #0  0x90a594c0 in objc_msgSend ()
>>> #1  0xbfffc21c in ?? ()
>>> #2  0x0002b850 in ocid_to_rbobj ()
>>> #3  0x0002df10 in ocdata_to_rbobj ()
>>> #4  0x0003051a in ovmix_register_ruby_method ()
>>> #5  0x00031a98 in rbobj_call_ruby ()
>>> #6  0x00031075 in ovmix_register_ruby_method ()
>>> #7  0x0002f8b9 in init_ovmix ()
>>> #8  0x927fa468 in -[NSObject(NSForwardInvocation) forward::] ()
>>> #9  0x90a5ccc1 in _objc_msgForward ()
>>> #10 0x932aed02 in -[NSCell _setContents:] ()
>>> #11 0x932aec95 in -[NSCell setObjectValue:] ()
>>> #12 0x9353abaa in -[_NSPlaceholderTextFieldPlugin
>>> showValue:inObject:] ()
>>> #13 0x93511593 in -[NSValueBinder showValue:inObject:] ()
>>> #14 0x93510938 in -[NSValueBinder
>>> _adjustObject:mode:observedController:observedKeyPath:context:editableState:adjustState
>>> :]
>>> ()
>>> #15 0x9353a287 in -[NSValueBinder
>>> updateTableColumnDataCell:forDisplayAtIndex:] ()
>>> #16 0x9353a9ef in -[NSTextValueBinder
>>> updateTableColumnDataCell:forDisplayAtIndex:] ()
>>> #17 0x9353a1d6 in -[_NSBindingAdaptor
>>> tableColumn:willDisplayCell:row:] ()
>>> #18 0x93402a9d in -[NSTableView
>>> _sendDelegateWillDisplayCell:forColumn:row:] ()
>>> #19 0x933ea065 in -[NSTableView _drawContentsAtRow:column:clipRect:]
>>> ()
>>> #20 0x933e902b in -[NSTableView drawRow:clipRect:] ()
>>> #21 0x933e67ce in -[NSTableView drawRowIndexes:clipRect:] ()
>>> #22 0x933e56a4 in -[NSTableView drawRect:] ()
>>> #23 0x933113b1 in -[NSView _drawRect:clip:] ()
>>> #24 0x9331040b in -[NSView
>>> _recursiveDisplayAllDirtyWithLockFocus:visRect:] ()
>>> #25 0x9330f473 in -[NSView
>>> _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView
>>> :]
>>> ()
>>> #26 0x93310041 in -[NSView
>>> _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView
>>> :]
>>> ()
>>> #27 0x93310041 in -[NSView
>>> _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView
>>> :]
>>> ()
>>> #28 0x93310041 in -[NSView
>>> _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView
>>> :]
>>> ()
>>> #29 0x93310041 in -[NSView
>>> _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView
>>> :]
>>> ()
>>> #30 0x9330eb78 in -[NSThemeFrame
>>> _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView
>>> :]
>>> ()
>>> #31 0x9330e362 in -[NSView
>>> _displayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:]
>>> ()
>>> #32 0x9330dc8e in -[NSView displayIfNeeded] ()
>>> #33 0x9330da32 in -[NSWindow displayIfNeeded] ()
>>> #34 0x9335dd6c in _handleWindowNeedsDisplay ()
>>> #35 0x9082dd6e in __CFRunLoopDoObservers ()
>>> #36 0x9082ce10 in CFRunLoopRunSpecific ()
>>> #37 0x9082cace in CFRunLoopRunInMode ()
>>> #38 0x92dec8d8 in RunCurrentEventLoopInMode ()
>>> #39 0x92debfe2 in ReceiveNextEventCommon ()
>>> #40 0x92debe39 in BlockUntilNextEventMatchingListInMode ()
>>> #41 0x93292465 in _DPSNextEvent ()
>>> #42 0x93292056 in -[NSApplication
>>> nextEventMatchingMask:untilDate:inMode:dequeue:] ()
>>> #43 0x9328bddb in -[NSApplication run] ()
>>> #44 0x9327fd2f in NSApplicationMain ()
>>> #45 0x0003fc0d in ffi_call_SYSV ()
>>> #46 0x0003fbae in ffi_call ()
>>> #47 0x0003cfa0 in rb_ffi_dispatch ()
>>> #48 0x00035ca0 in find_bs_boxed_by_encoding ()
>>> #49 0x00221e09 in call_cfunc ()
>>> #50 0x002214f2 in rb_call0 ()
>>> #51 0x00222489 in rb_call ()
>>> #52 0x0021c34a in rb_eval ()
>>> #53 0x00217d9c in eval_node ()
>>> #54 0x00218369 in ruby_exec_internal ()
>>> #55 0x002183b3 in ruby_exec ()
>>> #56 0x002183dd in ruby_run ()
>>> #57 0x00033474 in RBApplicationMain ()
>>> #58 0x00002886 in main ()
>>>
>>> So does somebody know of a good way of implementing this with
>>> RubyCocoa?
>>>
>>> Cheers,
>>> Eloy
>>>
>>> PS: I'm on svn rev 1983
>>>
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>>
>>
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