Hmmm. Making my cell a subclass of NSTextFieldCell solved the problem.
I would dearly love to get a look at the the source for
NSTextFieldCell to see what it's doing, behind-the-scenes, that makes
this binding work. In general, it would be a boon to developers if
Apple would open up the source for these types of core AppKit classes.
It's not like NSTextFieldCell is some cutting edge class and would be
a great way for developers to see how to create subclasses "the right
way."
Anyway, thanks for the tip, it works perfectly now. Just wish I knew
why...
-Ken
On Feb 12, 2009, at 6:18 PM, Corbin Dunn wrote:
On Feb 12, 2009, at 1:18 PM, Ken Tozier wrote:
24 hours later, still completely stumped on this one. The sticking
point seems to be that Apple's NSTextFieldCell is doing something
that is not clearly defined in the Key-Value Observing/Key-Value
coding documentation to allow the following to work
Your best bet is to probably just subclass NSTextFieldCell -- which
is probably correct for your cell, since you want to draw some text
and other sub cells. Modify the rect that you want the text to draw
in, and just call [super] to do the real drawing work.
[column bind: @"value" toObject: arrayController withKeyPath:
@"arrangedObjects.name" options: nil];
I suspect that all I'm missing is some required accessor, but
nowhere in the documentation does Apple offer a step by step
example on how to write a bindable custom NSCell subclass. What
methods are absolutely required? What methods are optional?
Please do log a bug requesting our documentation be clarified for
how to do this, and also log a bug saying that you can't bind the
value parameter of a plain NSCell. If you can, also enclose your
test project/code.
thank you!
corbin
Here's my custom cell code. Where am I going wrong?
Thanks for any help
@interface PMXDocumentCell : NSCell
{
NSButtonCell *addButton;
NSImage *backImage,
*backSelectedImage,
*addButtonImage,
*addButtonSelectedImage,
*currentBackImage;
NSString *documentName;
NSDictionary *textAttributes;
}
+ (id) documentCell;
- (void) initImages;
- (void) initSubCells;
- (NSString *) documentName;
- (void) setDocumentName:(NSString *) inName;
- (id) objectValue;
- (void) setObjectValue:(id) inObject;
@end
#define ADD_BUTTON_SIZE 17
@implementation PMXDocumentCell
+ (id) documentCell
{
return [[[PMXDocumentCell alloc]
init]
autorelease];
}
- (id) init
{
self = [super init];
if (self)
{
[self initImages];
[self initSubCells];
currentBackImage = backImage;
textAttributes = [[NSDictionary alloc]
initWithObjectsAndKeys:
[NSColor blackColor], NSForegroundColorAttributeName,
[NSFont
systemFontOfSize:13], NSFontAttributeName,
nil];
}
return self;
}
- (void) initImages
{
NSBundle *bundle = [NSBundle
bundleForClass: [self class]];
NSString *path;
path = [bundle pathForResource: @"add_button"
ofType: @"png"];
addButtonImage = [[NSImage alloc]
initWithContentsOfFile: path];
path = [bundle pathForResource: @"add_button_white" ofType:
@"png"];
addButtonSelectedImage = [[NSImage alloc] initWithContentsOfFile:
path];
path = [bundle pathForResource: @"toolbar_25"
ofType: @"png"];
backImage = [[NSImage alloc]
initWithContentsOfFile: path];
path = [bundle pathForResource: @"toolbar_25_focus" ofType:
@"png"];
backSelectedImage = [[NSImage alloc]
initWithContentsOfFile: path];
// set resizing
[addButtonImage setScalesWhenResized: YES];
[addButtonSelectedImage setScalesWhenResized: YES];
[backImage setScalesWhenResized: YES];
[backSelectedImage setScalesWhenResized: YES];
// size button images
[addButtonImage setSize: NSMakeSize(ADD_BUTTON_SIZE,
ADD_BUTTON_SIZE)];
[addButtonSelectedImage setSize: NSMakeSize(ADD_BUTTON_SIZE,
ADD_BUTTON_SIZE)];
}
- (void) initSubCells
{
addButton = [[NSButtonCell alloc] init];
[addButton setBordered: NO];
[addButton setButtonType: NSMomentaryChangeButton];
[addButton setImage: addButtonImage];
[addButton setAlternateImage: addButtonSelectedImage];
}
- (void) drawWithFrame:(NSRect) inCellFrame
inView:(NSView *) inControlView
{
NSRect buttonFrame = NSMakeRect(inCellFrame.size.width -
ADD_BUTTON_SIZE - 6, inCellFrame.origin.y, ADD_BUTTON_SIZE,
ADD_BUTTON_SIZE),
nameFrame = NSMakeRect(6, inCellFrame.origin.y,
inCellFrame.size.width - ADD_BUTTON_SIZE - 12 , ADD_BUTTON_SIZE);
NSPoint textPoint = NSMakePoint(inCellFrame.origin.x + 1,
inCellFrame.origin.y);
currentBackImage = [self isHighlighted] ? backSelectedImage :
backImage ;
[currentBackImage drawAtPoint: inCellFrame.origin
fromRect: NSZeroRect
operation: NSCompositeSourceOver
fraction: 1.0];
[addButton drawWithFrame: buttonFrame
inView: inControlView];
[documentName drawInRect: nameFrame
withAttributes: textAttributes];
}
- (NSString *) objectValue
{
return documentName;
}
- (void) setObjectValue:(id) inObject
{
if (inObject == nil)
inObject = @"document name";
if ([inObject isKindOfClass: [NSString class]])
[self setStringValue: inObject];
else
[NSException raise: NSInvalidArgumentException format: @"%@
Invalid object %@", NSStringFromSelector(_cmd), inObject];
}
- (NSString *) documentName
{
return documentName;
}
- (void) setDocumentName:(NSString *) inName
{
[inName retain];
[documentName release];
documentName = inName;
// Tell control view to redisplay us.
[(NSControl *)[self controlView] updateCell: self];
}
@end
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