MYUtilities: TimeIntervalFormatter.m@e55a17cdabd2

     1 //

     2 //  TimeIntervalFormatter.m

     3 //  MYUtilities

     4 //

     5 //  Copyright 2008 Jens Alfke. All rights reserved.

     6 //

     8 #import "TimeIntervalFormatter.h"

    11 @implementation TimeIntervalFormatter

    14 - (id) init

    15 {

    16     self = [super init];

    17     if (self != nil) {

    18         _showsMinutes = YES;

    19     }

    20     return self;

    21 }

    23 - (void) awakeFromNib

    24 {

    25     _showsMinutes = YES;

    26 }

    28 - (void) setShowsMinutes: (BOOL)show                {_showsMinutes = show;}

    29 - (void) setShowsFractionalSeconds: (BOOL)show      {_showsFractionalSeconds = show;}

    31 + (NSString*) formatTimeInterval: (NSTimeInterval)interval

    32 {

    33     TimeIntervalFormatter *fmt = [[self alloc] init];

    34     NSString *result = [fmt stringForObjectValue: [NSNumber numberWithDouble: interval]];

    35     [fmt release];

    36     return result;

    37 }

    40 - (NSString*) stringForObjectValue: (id)object

    41 {

    42     if (![object isKindOfClass:[NSNumber class]])

    43         return nil;

    44     NSTimeInterval time = [object doubleValue];

    45     NSString *sign;

    46     if( time==0.0 )

    47         return nil;

    48     else if( time < 0.0 ) {

    49         sign = @"-";

    50         time = -time;

    51     } else

    52         sign = @"";

    53     if( ! _showsFractionalSeconds )

    54         time = floor(time);

    55     int minutes = (int)floor(time / 60.0);

    56     if( _showsMinutes || minutes>0 ) {

    57         double seconds = time - 60.0*minutes;

    58         return [NSString stringWithFormat: (_showsFractionalSeconds ?@"%@%d:%06.3lf" :@"%@%d:%02.0lf"),

    59                                            sign,minutes,seconds];

    60     } else {

    61         return [NSString stringWithFormat: (_showsFractionalSeconds ?@"%@%.3lf" :@"%@%.0lf"),

    62                                            sign,time];

    63     }

    64 }

    67 - (BOOL)getObjectValue:(id *)anObject

    68              forString:(NSString *)string

    69       errorDescription:(NSString **)error

    70 {

    71     NSScanner *scanner = [NSScanner scannerWithString: string];

    72     [scanner setCharactersToBeSkipped: [NSCharacterSet whitespaceCharacterSet]];

    73     double seconds;

    74     if( [scanner isAtEnd] ) {

    75         seconds = 0.0;

    76     } else {

    77         if( ! [scanner scanDouble: &seconds] || seconds<0.0 ) goto error;

    78         if( [scanner scanString: @":" intoString: NULL] ) {

    79             double minutes = seconds;

    80             if( ! [scanner scanDouble: &seconds] || seconds<0.0 ) goto error;

    81             seconds += 60*minutes;

    82         }

    83         if( ! [scanner isAtEnd] ) goto error;

    84     }

    85     *anObject = [NSNumber numberWithDouble: seconds];

    86     return YES;

    88 error:

    89     *anObject = nil;

    90     if( error )

    91         *error = @"Not a valid time interval";

    92     return NO;

    93 }

    96 - (BOOL)isPartialStringValid:(NSString **)partialStringPtr

    97        proposedSelectedRange:(NSRangePointer)proposedSelRangePtr

    98               originalString:(NSString *)origString

    99        originalSelectedRange:(NSRange)origSelRange

   100             errorDescription:(NSString **)error

   101 {

   102     static NSCharacterSet *sIllegalChars;

   103     if( ! sIllegalChars )

   104         sIllegalChars = [[[NSCharacterSet characterSetWithCharactersInString: @"0123456789.:"]

   105                                 invertedSet] retain];

   106     return [*partialStringPtr rangeOfCharacterFromSet: sIllegalChars].length == 0;

   107 }

   110 @end

author	Jens Alfke <jens@mooseyard.com>
	Thu Mar 20 09:05:58 2008 -0700 (2008-03-20)
changeset 1	e55a17cdabd2
parent 0	d84d25d6cdbb
child 11	e5976864dfe9
permissions	-rw-r--r--