C++ SongList::empty方法代码示例

void PlaylistEditor::Update()
{
	if (Playlists->ReallyEmpty())
	{
		Content->Clear();
		MPD::TagList list;
		Mpd.GetPlaylists(list);
		sort(list.begin(), list.end(), CaseInsensitiveSorting());
		for (MPD::TagList::iterator it = list.begin(); it != list.end(); ++it)
		{
			utf_to_locale(*it);
			Playlists->AddOption(*it);
		}
		Playlists->Window::Clear();
		Playlists->Refresh();
	}
	
	if (!Playlists->Empty() && Content->ReallyEmpty())
	{
		Content->Reset();
		MPD::SongList list;
		Mpd.GetPlaylistContent(locale_to_utf_cpy(Playlists->Current()), list);
		if (!list.empty())
			Content->SetTitle(Config.titles_visibility ? "Playlist's content (" + IntoStr(list.size()) + " item" + (list.size() == 1 ? ")" : "s)") : "");
		else
			Content->SetTitle(Config.titles_visibility ? "Playlist's content" : "");
		bool bold = 0;
		for (MPD::SongList::const_iterator it = list.begin(); it != list.end(); ++it)
		{
			for (size_t j = 0; j < myPlaylist->Items->Size(); ++j)
			{
				if ((*it)->GetHash() == myPlaylist->Items->at(j).GetHash())
				{
					bold = 1;
					break;
				}
			}
			Content->AddOption(**it, bold);
			bold = 0;
		}
		MPD::FreeSongList(list);
		Content->Window::Clear();
		Content->Display();
	}
	
	if (w == Content && Content->ReallyEmpty())
	{
		Content->HighlightColor(Config.main_highlight_color);
		Playlists->HighlightColor(Config.active_column_color);
		w = Playlists;
	}
	
	if (Content->ReallyEmpty())
	{
		*Content << XY(0, 0) << "Playlist is empty.";
		Content->Window::Refresh();
	}
}

bool addSongsToPlaylist(const MPD::SongList &list, bool play, size_t position)
{
	if (list.empty())
		return false;
	position = std::min(position, Mpd.GetPlaylistLength());
	Mpd.StartCommandsList();
	for (auto s = list.rbegin(); s != list.rend(); ++s)
		if (Mpd.AddSong(*s, position) < 0)
			break;
	if (play)
		Mpd.Play(position);
	return Mpd.CommitCommandsList();
}

std::string FindSharedDir(const MPD::SongList &v)
{
	if (v.empty()) // this should never happen, but in case...
		FatalError("empty SongList passed to FindSharedDir(const SongList &)!");
	size_t i = -1;
	std::string first = v.front()->GetDirectory();
	for (MPD::SongList::const_iterator it = ++v.begin(); it != v.end(); ++it)
	{
		size_t j = 0;
		std::string dir = (*it)->GetDirectory();
		size_t length = std::min(first.length(), dir.length());
		while (!first.compare(j, 1, dir, j, 1) && j < length && j < i)
			++j;
		i = j;
	}
	return i ? first.substr(0, i) : "/";
}

MPD::SongList SearchEngine::getSelectedSongs()
{
	MPD::SongList result;
	for (auto it = w.begin(); it != w.end(); ++it)
	{
		if (it->isSelected())
		{
			assert(it->value().isSong());
			result.push_back(it->value().song());
		}
	}
	// if no item is selected, add current one
	if (result.empty() && !w.empty())
	{
		assert(w.current().value().isSong());
		result.push_back(w.current().value().song());
	}
	return result;
}

MPD::SongList Browser::getSelectedSongs()
{
	MPD::SongList result;
	auto item_handler = [this, &result](const MPD::Item &item) {
		if (item.type == itDirectory)
		{
#			ifndef WIN32
			if (isLocal())
			{
				MPD::ItemList list;
				GetLocalDirectory(list, item.name, true);
				for (auto it = list.begin(); it != list.end(); ++it)
					result.push_back(*it->song);
			}
			else
#			endif // !WIN32
			{
				auto list = Mpd.GetDirectoryRecursive(item.name);
				result.insert(result.end(), list.begin(), list.end());
			}
		}
		else if (item.type == itSong)
			result.push_back(*item.song);
		else if (item.type == itPlaylist)
		{
			auto list = Mpd.GetPlaylistContent(item.name);
			result.insert(result.end(), list.begin(), list.end());
		}
	};
	for (auto it = w.begin(); it != w.end(); ++it)
		if (it->isSelected())
			item_handler(it->value());
	// if no item is selected, add current one
	if (result.empty() && !w.empty())
		item_handler(w.current().value());
	return result;
}

MPD::SongList MediaLibrary::getSelectedSongs()
{
	MPD::SongList result;
	if (isActiveWindow(Tags))
	{
		auto tag_handler = [&result](const std::string &tag) {
			Mpd.StartSearch(true);
			Mpd.AddSearch(Config.media_lib_primary_tag, tag);
			Mpd.CommitSearchSongs(vectorMoveInserter(result));
		};
		bool any_selected = false;
		for (auto &e : Tags)
		{
			if (e.isSelected())
			{
				any_selected = true;
				tag_handler(e.value().tag());
			}
		}
		// if no item is selected, add current one
		if (!any_selected && !Tags.empty())
			tag_handler(Tags.current().value().tag());
	}
	else if (isActiveWindow(Albums))
	{
		bool any_selected = false;
		for (auto it = Albums.begin(); it != Albums.end() && !it->isSeparator(); ++it)
		{
			if (it->isSelected())
			{
				any_selected = true;
				auto &sc = it->value();
				Mpd.StartSearch(true);
				if (hasTwoColumns)
					Mpd.AddSearch(Config.media_lib_primary_tag, sc.entry().tag());
				else
					Mpd.AddSearch(Config.media_lib_primary_tag,
					              Tags.current().value().tag());
					Mpd.AddSearch(MPD_TAG_ALBUM, sc.entry().album());
				Mpd.AddSearch(MPD_TAG_DATE, sc.entry().date());
				size_t begin = result.size();
				Mpd.CommitSearchSongs(vectorMoveInserter(result));
				std::sort(result.begin()+begin, result.end(), SortSongs(false));
			}
		}
		// if no item is selected, add songs from right column
		if (!any_selected && !Albums.empty())
		{
			withUnfilteredMenu(Songs, [this, &result]() {
				result.insert(result.end(), Songs.beginV(), Songs.endV());
			});
		}
	}
	else if (isActiveWindow(Songs))
	{
		for (auto it = Songs.begin(); it != Songs.end(); ++it)
			if (it->isSelected())
				result.push_back(it->value());
		// if no item is selected, add current one
		if (result.empty() && !Songs.empty())
			result.push_back(Songs.current().value());
	}
	return result;
}