VLCKit/Sources/VLCMediaListAspect.m

/*****************************************************************************
 * VLCMediaList.m: VLC.framework VLCMediaList implementation
 *****************************************************************************
 * Copyright (C) 2007 Pierre d'Herbemont
 * Copyright (C) 2007 the VideoLAN team
 * $Id$
 *
 * Authors: Pierre d'Herbemont <pdherbemont # videolan.org>
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

#import "VLCMediaListAspect.h"
#import "VLCLibrary.h"
#import "VLCEventManager.h"
#import "VLCLibVLCBridging.h"
#include <vlc/vlc.h>
#include <vlc/libvlc.h>

// TODO: Documentation
@interface VLCMediaListAspect (Private)
/* Initializers */
- (void)initInternalMediaListView;

- (void)mediaListViewItemAdded:(NSDictionary *)args;
- (void)mediaListViewItemRemoved:(NSNumber *)index;
@end

@implementation VLCMediaListAspectNode
@synthesize media;
@synthesize children;

- (BOOL)isLeaf
{
    return self.children == NULL;
}

-(void)dealloc
{
    [self.children release];
    [super dealloc];
}
@end

@implementation VLCMediaListAspect (KeyValueCodingCompliance)
/* For the @"media" key */
- (int) countOfMedia
{
    return [cachedNode count];
}
- (id) objectInMediaAtIndex:(int)i
{
    return [[cachedNode objectAtIndex:i] media];
}
/* For the @"node" key */
- (int) countOfNode
{
    return [cachedNode count];
}
- (id) objectInNodeAtIndex:(int)i
{
    return [cachedNode objectAtIndex:i];
}
@end

/* libvlc event callback */
static void HandleMediaListViewItemAdded(const libvlc_event_t *event, void *user_data)
{
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    id self = user_data;
    [[VLCEventManager sharedManager] callOnMainThreadObject:self 
                                                 withMethod:@selector(mediaListViewItemAdded:) 
                                       withArgumentAsObject:[NSDictionary dictionaryWithObjectsAndKeys:
                                                          [VLCMedia mediaWithLibVLCMediaDescriptor:event->u.media_list_item_added.item], @"media",
                                                          [NSNumber numberWithInt:event->u.media_list_item_added.index], @"index",
                                                          nil]];
    [pool release];
}

static void HandleMediaListViewItemDeleted( const libvlc_event_t * event, void * user_data)
{
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    id self = user_data;
    [[VLCEventManager sharedManager] callOnMainThreadObject:self 
                                                 withMethod:@selector(mediaListViewItemRemoved:) 
                                       withArgumentAsObject:[NSNumber numberWithInt:event->u.media_list_item_deleted.index]];
    [pool release];
}

@implementation VLCMediaListAspect
- (void)dealloc
{
    // Release allocated memory
    libvlc_media_list_view_release(p_mlv);
    [cachedNode release];
    [super dealloc];
}
- (VLCMedia *)mediaAtIndex:(int)index
{
    libvlc_exception_t p_e;
    libvlc_exception_init( &p_e );
    libvlc_media_descriptor_t *p_md = libvlc_media_list_view_item_at_index( p_mlv, index, &p_e );
    quit_on_exception( &p_e );
    
    // Returns local object for media descriptor, searchs for user data first.  If not found it creates a 
    // new cocoa object representation of the media descriptor.
    return [VLCMedia mediaWithLibVLCMediaDescriptor:p_md];
}

- (VLCMediaListAspect *)childrenAtIndex:(int)index
{
    libvlc_exception_t p_e;
    libvlc_exception_init( &p_e );
    libvlc_media_list_view_t *p_sub_mlv = libvlc_media_list_view_children_at_index( p_mlv, index, &p_e );
    quit_on_exception( &p_e );

    if( !p_sub_mlv )
        return nil;

    // Returns local object for media descriptor, searchs for user data first.  If not found it creates a 
    // new cocoa object representation of the media descriptor.
    return [VLCMediaListAspect mediaListAspectWithLibVLCMediaListView:p_sub_mlv];
}

- (VLCMediaListAspectNode *)nodeAtIndex:(int)index
{
    VLCMediaListAspectNode * node = [[[VLCMediaListAspectNode alloc] init] autorelease];
    [node setMedia:[self mediaAtIndex: index]];
    return node;
}

- (int)count
{
    libvlc_exception_t p_e;
    libvlc_exception_init( &p_e );
    int result = libvlc_media_list_view_count( p_mlv, &p_e );
    quit_on_exception( &p_e );

    return result;
}
@end

@implementation VLCMediaListAspect (LibVLCBridging)
+ (id)mediaListAspectWithLibVLCMediaListView:(libvlc_media_list_view_t *)p_new_mlv;
{
    return [[[VLCMediaListAspect alloc] initWithLibVLCMediaListView:p_new_mlv] autorelease];
}

- (id)initWithLibVLCMediaListView:(libvlc_media_list_view_t *)p_new_mlv;
{
    if( self = [super init] )
    {
        p_mlv = p_new_mlv;
        libvlc_media_list_view_retain(p_mlv);
        //libvlc_media_list_lock(p_mlv->p_mlist);
        cachedNode = [[NSMutableArray alloc] initWithCapacity:libvlc_media_list_view_count(p_mlv, NULL)];
        int i, count = libvlc_media_list_view_count(p_mlv, NULL);
        for( i = 0; i < count; i++ )
        {
            libvlc_media_descriptor_t * p_md = libvlc_media_list_view_item_at_index(p_mlv, i, NULL);
            libvlc_media_list_view_t * p_sub_mlv = libvlc_media_list_view_children_at_index(p_mlv, i, NULL);
            VLCMediaListAspectNode * node = [[[VLCMediaListAspectNode alloc] init] autorelease];
            [node setMedia:[VLCMedia mediaWithLibVLCMediaDescriptor: p_md]];
            [node setChildren: p_sub_mlv ? [VLCMediaListAspect mediaListAspectWithLibVLCMediaListView: p_sub_mlv] : nil];
            [cachedNode addObject:node];
            libvlc_media_descriptor_release(p_md);
            if( p_sub_mlv ) libvlc_media_list_view_release(p_sub_mlv);
        }
        [self initInternalMediaListView];
        //libvlc_media_list_unlock(p_mlv->p_mlist);
    }
    return self;
}

- (libvlc_media_list_view_t *)libVLCMediaListView
{
    return (libvlc_media_list_view_t *)p_mlv;
}
@end

@implementation VLCMediaListAspect (Private)
- (void)initInternalMediaListView
{
    libvlc_exception_t e;
    libvlc_exception_init( &e );

    libvlc_event_manager_t *p_em = libvlc_media_list_event_manager( p_mlv, &e );

    /* Add internal callback */
    libvlc_event_attach( p_em, libvlc_MediaListViewItemAdded,   HandleMediaListViewItemAdded,   self, &e );
    libvlc_event_attach( p_em, libvlc_MediaListViewItemDeleted, HandleMediaListViewItemDeleted, self, &e );
    quit_on_exception( &e );
}

- (void)mediaListViewItemAdded:(NSDictionary *)args
{
    int index = [[args objectForKey:@"index"] intValue];
    VLCMedia * media = [args objectForKey:@"media"];

    VLCMediaListAspectNode * node = [[[VLCMediaListAspectNode alloc] init] autorelease];
    [node setMedia:media];
    [node setChildren:[self childrenAtIndex:index]];

    [self willChange:NSKeyValueChangeInsertion valuesAtIndexes:[NSIndexSet indexSetWithIndex:index] forKey:@"media"];
    [self willChange:NSKeyValueChangeInsertion valuesAtIndexes:[NSIndexSet indexSetWithIndex:index] forKey:@"node"];
    [cachedNode insertObject:node atIndex:index];
    [self didChange:NSKeyValueChangeInsertion valuesAtIndexes:[NSIndexSet indexSetWithIndex:index] forKey:@"node"];
    [self didChange:NSKeyValueChangeInsertion valuesAtIndexes:[NSIndexSet indexSetWithIndex:index] forKey:@"media"];
}

- (void)mediaListViewItemRemoved:(NSNumber *)index
{
    [self willChange:NSKeyValueChangeInsertion valuesAtIndexes:[NSIndexSet indexSetWithIndex:[index intValue]] forKey:@"media"];
    [self willChange:NSKeyValueChangeInsertion valuesAtIndexes:[NSIndexSet indexSetWithIndex:[index intValue]] forKey:@"node"];
    [cachedNode removeObjectAtIndex:[index intValue]];
    [self didChange:NSKeyValueChangeInsertion valuesAtIndexes:[NSIndexSet indexSetWithIndex:[index intValue]] forKey:@"node"];
    [self didChange:NSKeyValueChangeInsertion valuesAtIndexes:[NSIndexSet indexSetWithIndex:[index intValue]] forKey:@"media"];
}
@end