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/***************************************************************************
* Copyright (C) 2008-2014 by Andrzej Rybczak *
* electricityispower@gmail.com *
* *
* 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 St, Fifth Floor, Boston, MA 02110-1301, USA. *
***************************************************************************/
#ifndef NCMPCPP_PROXY_SONG_LIST_H
#define NCMPCPP_PROXY_SONG_LIST_H
#include "menu.h"
#include "song.h"
/// This fancy class provides a way to use NC::Menu<T> template instantiations
/// with different Ts in a uniform manner. Note that since it provides methods
/// such as getSong or currentSong, it's biased towards menus that somehow
/// contain songs.
///
/// Dependent types are T and F. T is type of items stored inside Menu, whereas
/// F is a function that takes Menu<T>::Item and converts it into MPD::Song pointer.
/// For Menu<MPD::Song> this is just taking address of given MPD::Song, but e.g.
/// Menu<MPD::Item> returns not null pointer only if requested position actually
/// contains a song and not directory or playlist.
class ProxySongList
{
struct Interface
{
virtual ~Interface() { }
virtual bool empty() = 0;
virtual size_t size() = 0;
virtual size_t choice() = 0;
virtual void highlight(size_t pos) = 0;
virtual bool isSelected(size_t pos) = 0;
virtual void setSelected(size_t pos, bool selected) = 0;
virtual bool isBold(size_t pos) = 0;
virtual void setBold(size_t pos, bool bold) = 0;
virtual MPD::Song *getSong(size_t pos) = 0;
virtual MPD::Song *currentSong() = 0;
};
template <typename T, typename F> struct Impl : Interface
{
typedef typename NC::Menu<T> Menu;
Impl(Menu &menu, F f) : m_menu(menu), m_song_getter(f) { }
virtual ~Impl() { }
virtual bool empty() { return m_menu.empty(); }
virtual size_t size() { return m_menu.size(); }
virtual size_t choice() { return m_menu.choice(); }
virtual void highlight(size_t pos) { m_menu.highlight(pos); }
virtual bool isSelected(size_t pos) {
assert(pos < m_menu.size());
return m_menu[pos].isSelected();
}
virtual void setSelected(size_t pos, bool selected) {
assert(pos < m_menu.size());
m_menu[pos].setSelected(selected);
}
virtual bool isBold(size_t pos) {
assert(pos < m_menu.size());
return m_menu[pos].isBold();
}
virtual void setBold(size_t pos, bool bold) {
assert(pos < m_menu.size());
m_menu[pos].setBold(bold);
}
virtual MPD::Song *getSong(size_t pos) {
assert(pos < m_menu.size());
return m_song_getter(m_menu[pos]);
}
virtual MPD::Song *currentSong() {
if (!m_menu.empty())
return getSong(m_menu.choice());
else
return 0;
}
private:
Menu &m_menu;
F m_song_getter;
};
std::shared_ptr<Interface> m_impl;
public:
ProxySongList() { }
template <typename T, typename F>
ProxySongList(typename NC::Menu<T> &menu, F f) : m_impl(new Impl<T, F>(menu, f)) { }
bool empty() const { return m_impl->empty(); }
size_t size() const { return m_impl->size(); }
size_t choice() const { return m_impl->choice(); }
void highlight(size_t pos) const { m_impl->highlight(pos); }
bool isSelected(size_t pos) const { return m_impl->isSelected(pos); }
void setSelected(size_t pos, bool selected) const { m_impl->setSelected(pos, selected); }
bool isBold(size_t pos) const { return m_impl->isBold(pos); }
void setBold(size_t pos, bool bold) const{ m_impl->setBold(pos, bold); }
MPD::Song *getSong(size_t pos) const { return m_impl->getSong(pos); }
MPD::Song *currentSong() const { return m_impl->currentSong(); }
/// @return true if there is no underlying menu object, false otherwise
operator bool() const { return m_impl.get() != 0; }
};
#endif // NCMPCPP_PROXY_SONG_LIST_H
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