00001 class playlist_position_reference_tracker : public playlist_callback_impl_base {
00002 public:
00004 playlist_position_reference_tracker(bool p_trackitem = true) : playlist_callback_impl_base(~0), m_trackitem(p_trackitem), m_playlist(infinite), m_item(infinite) {}
00005
00006 void on_items_added(t_size p_playlist,t_size p_start, const pfc::list_base_const_t<metadb_handle_ptr> & p_data,const bit_array & p_selection) {
00007 if (p_playlist == m_playlist && m_item != infinite && p_start <= m_item) {
00008 m_item += p_data.get_count();
00009 }
00010 }
00011 void on_items_reordered(t_size p_playlist,const t_size * p_order,t_size p_count) {
00012 if (p_playlist == m_playlist) {
00013 if (m_item < p_count) {
00014 m_item = order_helper::g_find_reverse(p_order,m_item);
00015 } else {
00016 m_item = infinite;
00017 }
00018 }
00019 }
00020
00021 void on_items_removed(t_size p_playlist,const bit_array & p_mask,t_size p_old_count,t_size p_new_count) {
00022 if (p_playlist == m_playlist) {
00023 if (m_item < p_old_count) {
00024 const t_size item_before = m_item;
00025 for(t_size walk = p_mask.find_first(true,0,p_old_count); walk < p_old_count; walk = p_mask.find_next(true,walk,p_old_count)) {
00026 if (walk < item_before) {
00027 m_item--;
00028 } else if (walk == item_before) {
00029 if (m_trackitem) m_item = infinite;
00030 break;
00031 } else {
00032 break;
00033 }
00034 }
00035 if (m_item >= p_new_count) m_item = infinite;
00036 } else {
00037 m_item = infinite;
00038 }
00039 }
00040 }
00041
00042
00043 void on_items_replaced(t_size p_playlist,const bit_array & p_mask,const pfc::list_base_const_t<t_on_items_replaced_entry> & p_data) {}
00044
00045 void on_playlist_created(t_size p_index,const char * p_name,t_size p_name_len) {
00046 if (m_playlist != infinite && p_index <= m_playlist) m_playlist++;
00047 }
00048 void on_playlists_reorder(const t_size * p_order,t_size p_count) {
00049 if (m_playlist < p_count) m_playlist = order_helper::g_find_reverse(p_order,m_playlist);
00050 else m_playlist = infinite;
00051 }
00052 void on_playlists_removed(const bit_array & p_mask,t_size p_old_count,t_size p_new_count) {
00053 if (m_playlist < p_old_count) {
00054 const t_size playlist_before = m_playlist;
00055 for(t_size walk = p_mask.find_first(true,0,p_old_count); walk < p_old_count; walk = p_mask.find_next(true,walk,p_old_count)) {
00056 if (walk < playlist_before) {
00057 m_playlist--;
00058 } else if (walk == playlist_before) {
00059 m_playlist = infinite;
00060 break;
00061 } else {
00062 break;
00063 }
00064 }
00065 } else {
00066 m_playlist = infinite;
00067 }
00068 }
00069
00070 t_size m_playlist, m_item;
00071 private:
00072 const bool m_trackitem;
00073 };
