Qt Code: 
  1. #include <QApplication>
  2.  
  3. #include <QDir>
  4. #include <QFileSystemModel>
  5. #include <QString>
  6. #include <QTableView>
  7. #include <QTreeView>
  8.  
  9. int main( int argc, char **argv )
  10. {
  11.     QApplication app( argc, argv ); 
  12.  
  13.     QFileSystemModel model;
  14.     QString const rootPath = "E:/file_test/very big";
  15.  
  16.     QTableView view;
  17.     view.setModel(&model);
  18.     view.setRootIndex(model.setRootPath(rootPath));
  19.  
  20.     view.show();
  21.     //....select the data you want to rename from the view
  22.     //let us assume I select 8000 of jpg files
  23.  
  24.     //don't know how to rename the file by QFileSystemModel, so I use QFile instead
  25.     QDir::setCurrent(rootPath);
  26.     model.blockSignals(true);
  27.     view.blockSignals(true);
  28.     for(int i = 0; i != 8000; ++i)
  29.     {
  30.       QFile file(rootPath + "/kkk" + QString::number(i) + ".jpg");
  31.       file.rename("jjj" + QString::number(i) + ".jpg");
  32.     }
  33.    model.blockSignals(false);
  34.     view.blockSignals(false);
  35.  
  36.     //the program will stall
  37.     qDebug() << "finish";
  38.  
  39.     return app.exec();
  40. }
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The UI would stall (become "blank" one before the the all of the files have changed their name)
I do try multi-thread (boost::thread) and QTimer::singleShot, but it is still stallif
besides, if I using multi-thread if will emit warning like "it is unsafe to use QPixmap in other
thread", so I better don't use it.

I added a progress bar to show the progress, but the progress bar also stall
How could I make the UI become alive when the files being rename?Thanks