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Sample Programs from NeXSTEP 3.3

//	MinusPanel.m
//	
//	You may freely copy, distribute and reuse the code in this example.
//	NeXT disclaims any warranty of any kind, expressed or implied, as to
//	its fitness for any particular use.
//

extern "Objective-C"		
{				
#import "MinusPanel.h"
}

@implementation MinusPanel

// When the user presses the minus sign on the keypad, the resulting character
// is number 45 from the Symbol character set, not a minus sign from the ASCII
// character set (which you would get by pressing the key to the right of the 
// zero key).  The Panel class ignores commandKeys from all sets except the 
// ASCII set, but we want the user to be able to depress the minus key on the
// keypad and have it act like the real minus key.  We can get around this
// problem by checking for this special minus sign and converting it into an
// ASCII minus sign before it reaches the regular commandKey: method
- (BOOL)commandKey:(NXEvent *)theEvent
{
    NXEvent localEvent;
    BOOL    symbolSet, minusSign;
    
    symbolSet = theEvent->data.key.charSet == NX_SYMBOLSET;
    minusSign = theEvent->data.key.charCode == 45;

    if (symbolSet && minusSign) {  /* check for minus */
	localEvent = *theEvent;
	localEvent.data.key.charSet = NX_ASCIISET;
	localEvent.data.key.charCode = '-';
	return [super commandKey:&localEvent];
    } else {
        return [super commandKey:theEvent];
    }
}

@end

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