Lists

Terms and Conditions
Lists hosted on this site
Email the Postmaster
Tips for posting to public mailing lists

Re: Binding to custom NSCell

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Binding to custom NSCell

Subject: Re: Binding to custom NSCell
From: Ken Tozier <email@hidden>
Date: Thu, 12 Feb 2009 16:18:24 -0500

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

[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?

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

The table column data cell is set to an instance of my "PMXDocumentNameCell " and bound using the exact same syntax that works for NSTextFieldCell

[column bind: @"value" toObject: arrayController withKeyPath: @"arrangedObjects.name" options: nil]; _______________________________________________

Cocoa-dev mailing list (email@hidden)

Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com

Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden


Follow-Ups:

Re: Binding to custom NSCell
From: Corbin Dunn <email@hidden>


References:  
  >Binding to custom NSCell (From: Ken Tozier <email@hidden>)




Prev by Date:
Re: Transparent Image

Next by Date:
Re: Transparent Image

Previous by thread:
Binding to custom NSCell

Next by thread:
Re: Binding to custom NSCell

Index(es):

Date
Thread