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Annotation of Examples/AppKit/CalculatorLab++/MinusPanel.C, revision 1.1.1.1

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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