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//
// Lynkeos
// $Id: MyImageListEnumerator.m,v 1.5 2005/01/27 23:07:03 j-etienne Exp $
//
// Created by Jean-Etienne LAMIAUD on Sun Nov 30 2003.
// Copyright (c) 2003-2005. Jean-Etienne LAMIAUD
//
// This program 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.
//
// This program 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 this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
#import "MyImageList.h"
@implementation MyImageListEnumerator
- (id) initWithImageList :(NSArray*)list startAt:(id)item
directSense:(BOOL)direct
{
[super init];
_lock = [[NSRecursiveLock alloc] init];
_itemList = [list retain];
_listSize = [list count];
_step = (direct ? 1 : -1);
if ( item != nil )
{
if ( [item isMemberOfClass: [MyMovieImage class]] )
{
_currentMovie = [item getParent];
_movieSize = [_currentMovie numberOfImages];
_itemIndex = [list indexOfObject:_currentMovie];
_movieIndex = [_currentMovie indexOfImage:item]+_step;
if ( (_step > 0 && _movieIndex >= _movieSize) ||
(_step < 0 && _movieIndex < 0) )
_itemIndex += _step;
}
else if ( [item isMemberOfClass: [MyMovie class]] )
{
_currentMovie = item;
_movieSize = [_currentMovie numberOfImages];
_itemIndex = [list indexOfObject:_currentMovie];
_movieIndex = (direct ? 0 : -1);
}
else
{
_currentMovie = nil;
_movieSize = 0;
_itemIndex = [list indexOfObject:item]+_step;
_movieIndex = 0;
}
}
else
{
_currentMovie = nil;
_movieSize = 0;
_itemIndex = (direct ? 0 : _listSize-1);
_movieIndex = 0;
}
return( self );
}
- (id) initWithImageList :(NSArray*)list
{
return( [self initWithImageList:list startAt:nil directSense:YES] );
}
- (void) dealloc
{
[_lock release];
[_itemList release];
[super dealloc];
}
- (NSArray *) allObjects
{
NSMutableArray *array = [NSArray array];
id item;
[_lock lock];
while ( (item = [self nextObject]) != nil )
[array addObject:item];
[_lock unlock];
return( array );
}
- (id) nextObject
{
id item = nil;
[_lock lock];
while ( item == nil &&
( ( _step > 0 && _itemIndex < _listSize) ||
( _step < 0 && _itemIndex >= 0) ) )
{
// Look for an image item (inside a movie or self contained)
if ( _currentMovie == nil ||
(_step > 0 && _movieIndex >= _movieSize) ||
(_step < 0 && _movieIndex < 0) )
{
item = [_itemList objectAtIndex:_itemIndex];
if ( [item isMemberOfClass: [MyMovie class]] )
{
_movieSize = [item numberOfImages];
_currentMovie = item;
item = nil;
_movieIndex = (_step > 0 ? 0 : _movieSize-1);
}
else
_itemIndex += _step;
}
if ( _currentMovie != nil )
{
if ( (_step > 0 && _movieIndex < _movieSize) ||
(_step < 0 && _movieIndex >= 0) )
{
item = [_currentMovie getMovieImageAtIndex:_movieIndex];
_movieIndex += _step;
}
if ( (_step > 0 && _movieIndex >= _movieSize) ||
(_step < 0 && _movieIndex < 0) )
_itemIndex += _step;
}
}
[_lock unlock];
return( item );
}
@end
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