src/proxy_song_list.h

   1 /***************************************************************************
   2  *   Copyright (C) 2008-2012 by Andrzej Rybczak                            *
   3  *   electricityispower@gmail.com                                          *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.              *
  19  ***************************************************************************/
  20
  21 #ifndef _PROXY_SONG_LIST
  22 #define _PROXY_SONG_LIST
  23
  24 #include "menu.h"
  25 #include "song.h"
  26
  27 class ProxySongList
  28 {
  29         struct Interface
  30         {
  31                 virtual ~Interface() { }
  32
  33                 virtual bool empty() = 0;
  34                 virtual size_t size() = 0;
  35                 virtual size_t choice() = 0;
  36                 virtual void highlight(size_t pos) = 0;
  37
  38                 virtual bool isSelected(size_t pos) = 0;
  39                 virtual void setSelected(size_t pos, bool selected) = 0;
  40
  41                 virtual MPD::Song *getSong(size_t pos) = 0;
  42                 virtual MPD::Song *currentSong() = 0;
  43         };
  44
  45         template <typename T, typename F> struct Impl : Interface
  46         {
  47                 typedef typename NC::Menu<T> Menu;
  48
  49                 Impl(Menu &menu, F f) : m_menu(menu), m_song_getter(f) { }
  50                 virtual ~Impl() { }
  51
  52                 virtual bool empty() { return m_menu.Empty(); }
  53                 virtual size_t size() { return m_menu.Size(); }
  54                 virtual size_t choice() { return m_menu.Choice(); }
  55                 virtual void highlight(size_t pos) { m_menu.Highlight(pos); }
  56
  57                 virtual bool isSelected(size_t pos) {
  58                         return m_menu[pos].isSelected();
  59                 }
  60
  61                 virtual void setSelected(size_t pos, bool selected) {
  62                         m_menu[pos].setSelected(selected);
  63                 }
  64
  65                 virtual MPD::Song *getSong(size_t pos) {
  66                         return m_song_getter(m_menu[pos]);
  67                 }
  68
  69                 virtual MPD::Song *currentSong() {
  70                         if (!m_menu.Empty())
  71                                 return getSong(m_menu.Choice());
  72                         else
  73                                 return 0;
  74                 }
  75
  76         private:
  77                 Menu &m_menu;
  78                 F m_song_getter;
  79         };
  80
  81         std::shared_ptr<Interface> m_impl;
  82
  83 public:
  84         template <typename T, typename F>
  85         ProxySongList(typename NC::Menu<T> &menu, F f) : m_impl(new Impl<T, F>(menu, f)) { }
  86
  87         bool empty() { return m_impl->empty(); }
  88         size_t size() { return m_impl->size(); }
  89         size_t choice() { return m_impl->choice(); }
  90         void highlight(size_t pos) { m_impl->highlight(pos); }
  91
  92         bool isSelected(size_t pos) { return m_impl->isSelected(pos); }
  93         void setSelected(size_t pos, bool selected) { m_impl->setSelected(pos, selected); }
  94
  95         MPD::Song *getSong(size_t pos) { return m_impl->getSong(pos); }
  96         MPD::Song *currentSong() { return m_impl->currentSong(); }
  97 };
  98
  99 template <typename T, typename F>
 100 std::shared_ptr<ProxySongList> mkProxySongList(typename NC::Menu<T> &menu, F f)
 101 {
 102         return std::make_shared<ProxySongList>(ProxySongList(menu, f));
 103 }
 104
 105 inline std::shared_ptr<ProxySongList> nullProxySongList()
 106 {
 107         return std::shared_ptr<ProxySongList>();
 108 }
 109
 110 #endif