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Annotation of Examples/AppKit/CalculatorLab++/MinusPanel.C, revision 1.1

1.1     ! root        1: //     MinusPanel.m
        !             2: //     
        !             3: //     You may freely copy, distribute and reuse the code in this example.
        !             4: //     NeXT disclaims any warranty of any kind, expressed or implied, as to
        !             5: //     its fitness for any particular use.
        !             6: //
        !             7: 
        !             8: extern "Objective-C"           
        !             9: {                              
        !            10: #import "MinusPanel.h"
        !            11: }
        !            12: 
        !            13: @implementation MinusPanel
        !            14: 
        !            15: // When the user presses the minus sign on the keypad, the resulting character
        !            16: // is number 45 from the Symbol character set, not a minus sign from the ASCII
        !            17: // character set (which you would get by pressing the key to the right of the 
        !            18: // zero key).  The Panel class ignores commandKeys from all sets except the 
        !            19: // ASCII set, but we want the user to be able to depress the minus key on the
        !            20: // keypad and have it act like the real minus key.  We can get around this
        !            21: // problem by checking for this special minus sign and converting it into an
        !            22: // ASCII minus sign before it reaches the regular commandKey: method
        !            23: - (BOOL)commandKey:(NXEvent *)theEvent
        !            24: {
        !            25:     NXEvent localEvent;
        !            26:     BOOL    symbolSet, minusSign;
        !            27:     
        !            28:     symbolSet = theEvent->data.key.charSet == NX_SYMBOLSET;
        !            29:     minusSign = theEvent->data.key.charCode == 45;
        !            30: 
        !            31:     if (symbolSet && minusSign) {  /* check for minus */
        !            32:        localEvent = *theEvent;
        !            33:        localEvent.data.key.charSet = NX_ASCIISET;
        !            34:        localEvent.data.key.charCode = '-';
        !            35:        return [super commandKey:&localEvent];
        !            36:     } else {
        !            37:         return [super commandKey:theEvent];
        !            38:     }
        !            39: }
        !            40: 
        !            41: @end

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