C++ Playlist::CountItems方法代码示例

void
Playlist::AppendRefs(const BMessage* refsReceivedMessage, int32 appendIndex)
{
	// the playlist is replaced by the refs in the message
	// or the refs are appended at the appendIndex
	// in the existing playlist
	if (appendIndex == APPEND_INDEX_APPEND_LAST)
		appendIndex = CountItems();

	bool add = appendIndex != APPEND_INDEX_REPLACE_PLAYLIST;

	if (!add)
		MakeEmpty();

	bool startPlaying = CountItems() == 0;

	Playlist temporaryPlaylist;
	Playlist* playlist = add ? &temporaryPlaylist : this;
	bool sortPlaylist = true;

	entry_ref ref;
	int32 subAppendIndex = CountItems();
	for (int i = 0; refsReceivedMessage->FindRef("refs", i, &ref) == B_OK;
			i++) {
		Playlist subPlaylist;
		if (_IsPlaylist(_MIMEString(&ref))) {
			AppendPlaylistToPlaylist(ref, &subPlaylist);
			// Do not sort the whole playlist anymore, as that
			// will screw up the ordering in the saved playlist.
			sortPlaylist = false;
		} else {
			AppendToPlaylistRecursive(ref, &subPlaylist);
			// At least sort this subsection of the playlist
			// if the whole playlist is not sorted anymore.
			if (!sortPlaylist)
				subPlaylist.Sort();
		}
		int32 subPlaylistCount = subPlaylist.CountItems();
		AdoptPlaylist(subPlaylist, subAppendIndex);
		subAppendIndex += subPlaylistCount;
	}
	if (sortPlaylist)
		playlist->Sort();

	if (add)
		AdoptPlaylist(temporaryPlaylist, appendIndex);

	if (startPlaying) {
		// open first file
		SetCurrentItemIndex(0);
	}
}

bool
Playlist::AdoptPlaylist(Playlist& other, int32 index)
{
	if (&other == this)
		return false;
	// NOTE: this is not intended to merge two "equal" playlists
	// the given playlist is assumed to be a temporary "dummy"
	if (fItems.AddList(&other.fItems, index)) {
		// take care of the notifications
		int32 count = other.CountItems();
		for (int32 i = index; i < index + count; i++) {
			PlaylistItem* item = ItemAtFast(i);
			_NotifyItemAdded(item, i);
		}
		if (index <= fCurrentIndex)
			SetCurrentItemIndex(fCurrentIndex + count);
		// empty the other list, so that the PlaylistItems are now ours
		other.fItems.MakeEmpty();
		return true;
	}
	return false;
}