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Sample Programs from NeXSTEP 3.3

/* Generated by Interface Builder */

#import "DateTFCell.h"
#import <appkit/appkit.h>

@implementation DateTFCell

- select:(const NXRect *)aRect inView:controlView editor:textObj delegate:anObject start:(int)selStart length:(int)selLength
{
	/* do what the superclass would do */
	[super select:aRect inView:controlView editor:textObj delegate:anObject start:selStart length:selLength];
 
	/* get the current text filter function */
	oldTextFilter = [textObj textFilter];
	
	/* set the filter func to be the custom function for DateTextField */
	[textObj setTextFilter:(NXTextFilterFunc)dateFilter];
	return self;
}

- edit:(const NXRect *)aRect inView:controlView editor:textObj delegate:anObject event:(NXEvent *)theEvent
{
	/* do what the superclass would do */
	[super edit:aRect inView:controlView editor:textObj delegate:anObject event:theEvent];
 
	/* get the current text filter function */
	oldTextFilter = [textObj textFilter];
	
	/* set the filter func to be the custom function for DateTextField */
	[textObj setTextFilter:(NXTextFilterFunc)dateFilter];
	return self;
}

- endEditing:anObject
{
	/* restore the original text filter function */
	[anObject setTextFilter:(NXTextFilterFunc)oldTextFilter];
	
	/* do whatever the superclass would do */
	[super endEditing:anObject];
	return self;
}

char *dateFilter(id textObj, char *inputText, int *inputLength, int position)
{
	char temp[] = "";
	
	/* The form of the date is MM/DD/YYYY.  So find a '/' in position 2 and 
	 * position 5.  All other characters must be numbers but only 10
	 * characters allowed 
	 */
	if ((position == 2) || (position == 5)) {
		if (*inputText != '/') {
			*inputLength = 0;
			return (temp);
		} else {
			return (inputText);
		}
	} else if (position >= 10) {
		*inputLength = 0;
		return (temp);
	} else if ((*inputText >= '0') && (*inputText <= '9')) {
		return (inputText);
	} else {
		*inputLength = 0;
		return (temp);
	}
}

@end

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