OnlyIntegerValueFormatter.m

/**
 * DisableMonitor, Disable Monitors on Mac
 *
 * Copyright (C) 2014 Tobias Salzmann
 *
 * DisableMonitor is free software: you can redistribute it and/or modify it under the terms of the
 * GNU General Public License as published by the Free Software Foundation, either version 2 of the
 * License, or (at your option) any later version.
 *
 * DisableMonitor is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * See the GNU General Public License for more details. You should have received a copy of the GNU
 * General Public License along with DisableMonitor. If not, see <http://www.gnu.org/licenses/>.
 *
 * Authors: Tobias Salzmann
 */

#import "OnlyIntegerValueFormatter.h"

@implementation OnlyIntegerValueFormatter

- (BOOL)isPartialStringValid:(NSString*)partialString newEditingString:(NSString**)newString errorDescription:(NSString**)error
{
    if([partialString length] == 0) {
        return YES;
    }
    
    NSScanner* scanner = [NSScanner scannerWithString:partialString];
    
    if(!([scanner scanInt:0] && [scanner isAtEnd])) {
        NSBeep();
        return NO;
    }
    
    return YES;
}

@end