132 lines
4.6 KiB
C++
132 lines
4.6 KiB
C++
/***************************************************************************
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* Copyright (C) 2008-2012 by Andrzej Rybczak *
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* electricityispower@gmail.com *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
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***************************************************************************/
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#ifndef _PROXY_SONG_LIST
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#define _PROXY_SONG_LIST
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#include "menu.h"
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#include "song.h"
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/// This fancy class provides a way to use NC::Menu<T> template instantiations
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/// with different Ts in a uniform manner. Note that since it provides methods
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/// such as getSong or currentSong, it's biased towards menus that somehow
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/// contain songs.
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///
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/// Dependent types are T and F. T is type of items stored inside Menu, whereas
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/// F is a function that takes Menu<T>::Item and converts it into MPD::Song pointer.
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/// For Menu<MPD::Song> this is just taking address of given MPD::Song, but e.g.
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/// Menu<MPD::Item> returns not null pointer only if requested position actually
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/// contains a song and not directory or playlist.
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class ProxySongList
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{
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struct Interface
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{
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virtual ~Interface() { }
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virtual bool empty() = 0;
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virtual size_t size() = 0;
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virtual size_t choice() = 0;
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virtual void highlight(size_t pos) = 0;
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virtual bool isSelected(size_t pos) = 0;
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virtual void setSelected(size_t pos, bool selected) = 0;
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virtual bool isBold(size_t pos) = 0;
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virtual void setBold(size_t pos, bool bold) = 0;
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virtual MPD::Song *getSong(size_t pos) = 0;
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virtual MPD::Song *currentSong() = 0;
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};
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template <typename T, typename F> struct Impl : Interface
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{
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typedef typename NC::Menu<T> Menu;
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Impl(Menu &menu, F f) : m_menu(menu), m_song_getter(f) { }
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virtual ~Impl() { }
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virtual bool empty() { return m_menu.empty(); }
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virtual size_t size() { return m_menu.size(); }
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virtual size_t choice() { return m_menu.choice(); }
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virtual void highlight(size_t pos) { m_menu.highlight(pos); }
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virtual bool isSelected(size_t pos) {
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return m_menu[pos].isSelected();
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}
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virtual void setSelected(size_t pos, bool selected) {
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m_menu[pos].setSelected(selected);
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}
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virtual bool isBold(size_t pos) {
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return m_menu[pos].isBold();
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}
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virtual void setBold(size_t pos, bool bold) {
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m_menu[pos].setBold(bold);
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}
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virtual MPD::Song *getSong(size_t pos) {
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return m_song_getter(m_menu[pos]);
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}
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virtual MPD::Song *currentSong() {
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if (!m_menu.empty())
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return getSong(m_menu.choice());
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else
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return 0;
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}
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private:
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Menu &m_menu;
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F m_song_getter;
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};
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std::shared_ptr<Interface> m_impl;
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public:
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template <typename T, typename F>
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ProxySongList(typename NC::Menu<T> &menu, F f) : m_impl(new Impl<T, F>(menu, f)) { }
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bool empty() { return m_impl->empty(); }
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size_t size() { return m_impl->size(); }
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size_t choice() { return m_impl->choice(); }
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void highlight(size_t pos) { m_impl->highlight(pos); }
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bool isSelected(size_t pos) { return m_impl->isSelected(pos); }
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void setSelected(size_t pos, bool selected) { m_impl->setSelected(pos, selected); }
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bool isBold(size_t pos) { return m_impl->isBold(pos); }
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void setBold(size_t pos, bool bold) { m_impl->setBold(pos, bold); }
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MPD::Song *getSong(size_t pos) { return m_impl->getSong(pos); }
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MPD::Song *currentSong() { return m_impl->currentSong(); }
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};
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template <typename T, typename F>
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std::shared_ptr<ProxySongList> mkProxySongList(typename NC::Menu<T> &menu, F f)
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{
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return std::make_shared<ProxySongList>(ProxySongList(menu, f));
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}
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inline std::shared_ptr<ProxySongList> nullProxySongList()
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{
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return std::shared_ptr<ProxySongList>();
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}
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#endif
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