playlist_model.cpp

   1 #include "playlist_model.h"
   2
   3 //=========================================================
   4 PlaylistModel::PlaylistModel( QObject *parent )
   5         : QAbstractItemModel( parent )
   6 {
   7
   8 }
   9 //=========================================================
  10 QVariant PlaylistModel::data( const QModelIndex &index, int role ) const
  11 {
  12         // invalid index position, so we return nothing
  13         if( !index.isValid() || index.column() > 0 || index.row() >= items.size())
  14                 return QVariant();
  15
  16         // return the title of the song for the display role
  17         switch( role ){
  18         case Qt::DisplayRole:
  19                 return items[ index.row()].name;
  20         }
  21
  22         // for unhandled roles, we just return NULL data
  23         return QVariant();
  24 }
  25 //=========================================================
  26 QModelIndex PlaylistModel::index( int row, int col, const QModelIndex &parent ) const
  27 {
  28         // return invalid index for invalid input parameters
  29         if( col != 0 || row < 0 || parent.isValid())
  30                 return QModelIndex();
  31
  32         // row cannot be larger then size of the playlist
  33         if( row >= items.size())
  34                 return QModelIndex();
  35
  36         // ok, this is a valid row,col so we return a valid index for it
  37         return createIndex( row, col );
  38 }
  39 //=========================================================
  40 QModelIndex PlaylistModel::parent( const QModelIndex &index ) const
  41 {
  42         // No parents for any index - flat list
  43         return QModelIndex();
  44 }
  45 //=========================================================
  46 int PlaylistModel::rowCount( const QModelIndex & parent) const
  47 {
  48         if (parent.isValid())
  49                 return 0;
  50         else
  51                 // Number of Rows is equal to the number of items in the list
  52                 return items.size();
  53 }
  54 //=========================================================
  55 int PlaylistModel::colCount( const QModelIndex & parent) const
  56 {
  57
  58         if (parent.isValid())
  59                 return 0;
  60         else
  61                 // PlayList always has one column
  62                 return 1;
  63 }