Re: [Rubycocoa-talk] copyWithZone

[Eloy D. <elo...@gm...>]

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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