Qt Code: 
  1. connect(selectionGroupModel,\
  2.             SIGNAL(currentRowChanged( const QModelIndex & , const QModelIndex &  )),\
  3.             this,\
  4.             SLOT(selectionChanged( const QModelIndex & , const QModelIndex &  )));
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Qt Code: 
  1. void MusicSettingsWidget::selectionChanged( const QModelIndex & current, const QModelIndex & previous )
  2. {
  3.     qDebug()<<"selectionChanged";
  4.  
  5.    // qDebug()<<"select change!"<<index.data().toString();
  6.     if ( current.data().toString() != "all music" ){
  7.         musicSettings4a6ConfigFile->beginGroup("GroupList");
  8.         QStringList musicList;
  9.         qDebug()<<"current.data().toString()"<<current.data().toString();
  10.         QString musicNames;
  11.         musicNames = musicSettings4a6ConfigFile->value( current.data().toString() ).toString();
  12.         qDebug()<<"musicNames"<<musicNames;
  13.         musicList = musicNames.split(";",QString::SkipEmptyParts);
  14.         musicList.removeDuplicates();
  15.         musicSettings4a6ConfigFile->endGroup();
  16.         mp3ListModel->setStringList(musicList);
  17.         ui->listView->setModel(mp3ListModel);
  18.         ui->listView->selectAll();
  19.     }else{
  20.         mp3ListInit();
  21.         ui->listView->selectAll();
  22.     }
  23. }
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