I have been trying to get an application using PyObjC to display
colors in an NSTableView. In my searching around, it seems the
consensus is "NSColorWell isn't an NSCell, create your own subclass
of NSCell which just shows the color."
So, with no further information, I tried this with an NSCell subclass:
class MyColorCell(NSCell):
currentColor = objc.ivar('currentColor')
def setObjectValue_(self, objectValue):
self.currentColor = objectValue
def drawInteriorWithFrame_inView_(self, cellFrame, controlView):
if self.currentColor is not None:
self.currentColor.drawSwatchInRect_(cellFrame)
and in my app delegate I have:
class ColorCellExampleAppDelegate(NibClassBuilder.AutoBaseClass):
colors = objc.ivar('colors') # array containing created model
objects
colorArrayController = objc.ivar('colorArrayController') # bound
so we can use addObject_()
newColorWell = objc.ivar('newColorWell')
colorTableColumn = objc.ivar('colorTableColumn') # use to set
the data cell.
def applicationDidFinishLaunching_(self, notification):
self.colorCell = MyColorCell.alloc().init()
self.colorTableColumn.setDataCell_(self.colorCell)
def addNewColor_(self, sender): # bound to add button
newColor = MyModelColorValue.alloc().initWithColor_
(self.newColorWell.color())
self.colorArrayController.addObject_(newColor)
The model object definition is:
class MyModelColorValue(NSObject):
color = objc.ivar('color')
def initWithColor_(self, color):
self.color = color.copy()
return self
The problem comes once I try to click on the colors in the list, the
program just barfs. It looks like an object is getting freed where it
shouldn't.
I'm getting either
objc: FREED(id): message isKindOfClass: sent to freed object=0x11cd510
or just a plain "Bus error" before it dies.
Looking at the stack trace, the first few lines are:
0 <<00000000>> 0xfffeff18 objc_msgSend_rtp + 24
1 com.apple.AppKit 0x93905594 -[NSValueBinder
displayValueForObjectValue:] + 204
2 com.apple.AppKit 0x93904b7c -[NSValueBinder
_adjustObject:mode:observedController:observedKeyPath:context:editableSt
ate:adjustState:] + 968
3 com.apple.AppKit 0x9392fd04 -[NSValueBinder
updateTableColumnDataCell:forDisplayAtIndex:] + 140
4 com.apple.AppKit 0x939304d0 -[NSTextValueBinder
updateTableColumnDataCell:forDisplayAtIndex:] + 88
5 com.apple.AppKit 0x9392fc5c -[_NSBindingAdaptor
tableColumn:willDisplayCell:row:] + 108
6 com.apple.AppKit 0x9378d7c4 -[NSTableView
_sendDelegateWillDisplayCell:forColumn:row:] + 88
7 com.apple.AppKit 0x9378d204 -[NSTableView
_drawContentsAtRow:column:clipRect:] + 396
8 com.apple.AppKit 0x9378cbf8 -[NSTableView
drawRow:clipRect:] + 220
I have a sample project demonstrating the error, but I can't attach
it for some reason, so if you want it, email me.. I would appreciate
it if someone can tell what is going on, or can point me towards
getting started in debugging memory errors in PyObjC.
Thanks,
Josh
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