listviews.cpp

VLC媒体播放程序

PlaylistView::KeyDown( const char* bytes, int32 numBytes )
{
	if ( numBytes < 1 )
		return;
		
	if ( ( bytes[0] == B_BACKSPACE ) || ( bytes[0] == B_DELETE ) )
	{
		RemoveSelected();
	}
	DragSortableListView::KeyDown( bytes, numBytes );
}

/*****************************************************************************
 * PlaylistView::Pulse
 *****************************************************************************/
void
PlaylistView::Pulse()
{
	if ( fMainWindow->IsStopped() )
		SetPlaying( false );
}

/*****************************************************************************
 * PlaylistView::SelectionChanged
 *****************************************************************************/
void
PlaylistView::SelectionChanged()
{
	BLooper* looper = Looper();
	if ( fSelectionChangeMessage && looper )
	{
		BMessage message( *fSelectionChangeMessage );
		looper->PostMessage( &message );
	}
}


/*****************************************************************************
 * PlaylistView::MoveItems
 *****************************************************************************/
void
PlaylistView::MoveItems( BList& items, int32 index )
{
	DeselectAll();
	// we remove the items while we look at them, the insertion index is decreased
	// when the items index is lower, so that we insert at the right spot after
	// removal
	if ( fVlcWrapper->PlaylistLock() )
	{
		BList removedItems;
		BList removeItems;
		int32 count = items.CountItems();
		int32 indexOriginal = index;
		// remember currently playing item
		BListItem* playingItem = _PlayingItem();
		// collect item pointers for removal by index
		for ( int32 i = 0; i < count; i++ )
		{
			int32 removeIndex = IndexOf( (BListItem*)items.ItemAt( i ) );
			void* item = fVlcWrapper->PlaylistItemAt( removeIndex );
			if ( item && removeItems.AddItem( item ) )
			{
				if ( removeIndex < index )
					index--;
			}
			// else ??? -> blow up
		}
		// actually remove items using pointers
		for ( int32 i = 0; i < count; i++ )
		{
			void* item = fVlcWrapper->PlaylistRemoveItem( removeItems.ItemAt( i ) );
			if ( item && !removedItems.AddItem( item ) )
				free( item );
		}
		// add items at index
		for ( int32 i = 0; void* item = removedItems.ItemAt( i ); i++ )
		{
			if ( fVlcWrapper->PlaylistAddItem( item, index ) )
				// next items will be inserted after this one
				index++;
			else
				free( item );
		}
		// update GUI
		DragSortableListView::MoveItems( items, indexOriginal );
		// restore currently playing item
		_SetPlayingIndex( playingItem );
		// update interface (in case it isn't playing,
		// there is a chance that it needs to update)
		fMainWindow->PostMessage( MSG_UPDATE );
		fVlcWrapper->PlaylistUnlock();
	}
}

/*****************************************************************************
 * PlaylistView::CopyItems
 *****************************************************************************/
void
PlaylistView::CopyItems( BList& items, int32 toIndex )
{
	DeselectAll();
	// we remove the items while we look at them, the insertion index is decreased
	// when the items index is lower, so that we insert at the right spot after
	// removal
	if ( fVlcWrapper->PlaylistLock() )
	{
		BList clonedItems;
		int32 count = items.CountItems();
		// remember currently playing item
		BListItem* playingItem = _PlayingItem();
		// collect cloned item pointers
		for ( int32 i = 0; i < count; i++ )
		{
			int32 index = IndexOf( (BListItem*)items.ItemAt( i ) );
			void* item = fVlcWrapper->PlaylistItemAt( index );
			void* cloned = fVlcWrapper->PlaylistCloneItem( item );
			if ( cloned && !clonedItems.AddItem( cloned ) )
				free( cloned );
			
		}
		// add cloned items at index
		int32 index = toIndex;
		for ( int32 i = 0; void* item = clonedItems.ItemAt( i ); i++ )
		{
			if ( fVlcWrapper->PlaylistAddItem( item, index ) )
				// next items will be inserted after this one
				index++;
			else
				free( item );
		}
		// update GUI
		DragSortableListView::CopyItems( items, toIndex );
		// restore currently playing item
		_SetPlayingIndex( playingItem );
		// update interface (in case it isn't playing,
		// there is a chance that it needs to update)
		fMainWindow->PostMessage( MSG_UPDATE );
		fVlcWrapper->PlaylistUnlock();
	}
}

/*****************************************************************************
 * PlaylistView::RemoveItemList
 *****************************************************************************/
void
PlaylistView::RemoveItemList( BList& items )
{
	if ( fVlcWrapper->PlaylistLock() )
	{
		// remember currently playing item
		BListItem* playingItem = _PlayingItem();
		// collect item pointers for removal
		BList removeItems;
		int32 count = items.CountItems();
		for ( int32 i = 0; i < count; i++ )
		{
			int32 index = IndexOf( (BListItem*)items.ItemAt( i ) );
			void* item = fVlcWrapper->PlaylistItemAt( index );
			if ( item && !removeItems.AddItem( item ) )
				free( item );
		}
		// remove items from playlist
		count = removeItems.CountItems();
		for ( int32 i = 0; void* item = removeItems.ItemAt( i ); i++ )
		{
			fVlcWrapper->PlaylistRemoveItem( item );
		}
		// update GUI
		DragSortableListView::RemoveItemList( items );
		// restore currently playing item
		_SetPlayingIndex( playingItem );
		// update interface (in case it isn't playing,
		// there is a chance that it needs to update)
		fMainWindow->PostMessage( MSG_UPDATE );
		fVlcWrapper->PlaylistUnlock();
	}
}

/*****************************************************************************
 * PlaylistView::CloneItem
 *****************************************************************************/
BListItem*
PlaylistView::CloneItem( int32 atIndex ) const
{
	BListItem* clone = NULL;
	if ( PlaylistItem* item = dynamic_cast<PlaylistItem*>( ItemAt( atIndex ) ) )
		clone = new PlaylistItem( item->Text() );
	return clone;
}

/*****************************************************************************
 * PlaylistView::DrawListItem
 *****************************************************************************/
void
PlaylistView::DrawListItem( BView* owner, int32 index, BRect frame ) const
{
	if ( PlaylistItem* item = dynamic_cast<PlaylistItem*>( ItemAt( index ) ) )
		item->Draw( owner,  frame, index % 2,
					fDisplayMode, index == fCurrentIndex, fPlaying );
}

/*****************************************************************************
 * PlaylistView::MakeDragMessage
 *****************************************************************************/
void
PlaylistView::MakeDragMessage( BMessage* message ) const
{
	if ( message )
	{
		message->AddPointer( "list", (void*)this );
		int32 index;
		for ( int32 i = 0; ( index = CurrentSelection( i ) ) >= 0; i++ )
		{
			message->AddInt32( "index", index );
			// add refs to message (inter application communication)
			if ( BStringItem* item = dynamic_cast<BStringItem*>( ItemAt( index ) ) )
			{
				entry_ref ref;
				if ( get_ref_for_path( item->Text(), &ref ) == B_OK )
					message->AddRef( "refs", &ref );
			}
		}
	}
}

/*****************************************************************************
 * PlaylistView::SetCurrent
 *****************************************************************************/
void
PlaylistView::SetCurrent( int32 index )
{
	if ( fCurrentIndex != index )
	{
		InvalidateItem( fCurrentIndex );
		fCurrentIndex = index;
		InvalidateItem( fCurrentIndex );
	}
}

/*****************************************************************************
 * PlaylistView::SetPlaying
 *****************************************************************************/
void
PlaylistView::SetPlaying( bool playing )
{
	if ( fPlaying != playing )
	{
		fPlaying = playing;
		InvalidateItem( fCurrentIndex );
	}
}

/*****************************************************************************
 * PlaylistView::SetPlaying
 *****************************************************************************/
void
PlaylistView::RebuildList()
{
	// remove all items
	int32 count = CountItems();
	while ( BListItem* item = RemoveItem( --count ) )
		delete item;
	
	// rebuild listview from VLC's playlist
	for ( int i = 0; i < fVlcWrapper->PlaylistSize(); i++ )
		AddItem( new PlaylistItem( fVlcWrapper->PlaylistItemName( i ) ) );
}


/*****************************************************************************
 * PlaylistView::SortReverse
 *****************************************************************************/
void
PlaylistView::SortReverse()
{
	if ( int32 count = CountSelectedItems() )
	{
		int32 last  = count - 1;
		// remember currently playing item
		BListItem* playingItem = _PlayingItem();
		for ( int32 first = 0; first < count / 2; first++, last-- )
		{
			int32 index1 = CurrentSelection( first);
			int32 index2 = CurrentSelection( last);
			if ( SwapItems( index1, index2 ) )
			{
				// index2 > index1, so the list won't get messed up
				// if we remove the items in that order
				// TODO: Error checking + handling!
				void* item2 = fVlcWrapper->PlaylistRemoveItem( index2 );
				void* item1 = fVlcWrapper->PlaylistRemoveItem( index1 );
				fVlcWrapper->PlaylistAddItem( item2, index1 );
				fVlcWrapper->PlaylistAddItem( item1, index2 );
			}
		}
		// restore currently playing item
		_SetPlayingIndex( playingItem );
	}
}

/*****************************************************************************
 * PlaylistView::SortByPath
 *****************************************************************************/
void
PlaylistView::SortByPath()
{
	
}

/*****************************************************************************
 * PlaylistView::SortByName
 *****************************************************************************/
void
PlaylistView::SortByName()
{
}

/*****************************************************************************
 * PlaylistView::SetDisplayMode
 *****************************************************************************/
void
PlaylistView::SetDisplayMode( uint32 mode )
{
	if ( mode != fDisplayMode )
	{
		fDisplayMode = mode;
		Invalidate();
	}
}

/*****************************************************************************
 * PlaylistView::_PlayingItem
 *****************************************************************************/
BListItem*
PlaylistView::_PlayingItem() const
{
	int32 currentIndex, size;
	fVlcWrapper->GetPlaylistInfo( currentIndex, size );
	return ItemAt( currentIndex );
}

/*****************************************************************************
 * PlaylistView::_SetPlayingIndex
 *****************************************************************************/
void
PlaylistView::_SetPlayingIndex( BListItem* playingItem )
{
	for ( int32 i = 0; BListItem* item = ItemAt( i ); i++ )
	{
		if ( item == playingItem )
		{
			fVlcWrapper->PlaylistSetPlaying( i );
			SetCurrent( i );
			break;
		}
	}
}