transmission/macosx/NSMutableArrayAdditions.m

58 lines
2.3 KiB
Objective-C

/******************************************************************************
* $Id$
*
* Copyright (c) 2011-2012 Transmission authors and contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*****************************************************************************/
#import "NSMutableArrayAdditions.h"
@implementation NSMutableArray (NSMutableArrayAdditions)
/*
Note: This assumes Apple implemented this as an array under the hood.
If the underlying data structure is a linked-list, for example, then this might be less
efficient than simply removing the object and re-adding it.
*/
- (void) moveObjectAtIndex: (NSUInteger) fromIndex toIndex: (NSUInteger) toIndex
{
if (fromIndex == toIndex)
return;
id object = [[self objectAtIndex: fromIndex] retain];
//shift objects - more efficient than simply removing the object and re-inserting the object
if (fromIndex < toIndex)
{
for (NSUInteger i = fromIndex; i < toIndex; ++i)
[self replaceObjectAtIndex: i withObject: [self objectAtIndex: i+1]];
}
else
{
for (NSUInteger i = fromIndex; i > toIndex; --i)
[self replaceObjectAtIndex: i withObject: [self objectAtIndex: i-1]];
}
[self replaceObjectAtIndex: toIndex withObject: object];
[object release];
}
@end