Hello all,

I'm trying to understand how the following code that got generated in ui_mainwindow.h file. Can someone please help me understand how it's achieved. I'm trying to build similar application and I'm using qt4.x with c++. Thanks in advance.

Qt Code: 
  1. class Ui_MainWindow
  2. {
  3. public:
  4.   	 QLineEdit *filename_input;
  5.    	 QLabel *current_logfile_label;
  6. ...
  7.  
  8. void setupUi(QMainWindow *MainWindow)
  9.     {
  10.         filename_input = new QLineEdit(centralWidget);
  11.         filename_input->setObjectName(QString::fromUtf8("filename_input"));
  12.         filename_input->setGeometry(QRect(20, 390, 291, 31));
  13.         current_logfile_label = new QLabel(centralWidget);
  14.         current_logfile_label->setObjectName(QString::fromUtf8("current_logfile_label"));
  15.         current_logfile_label->setGeometry(QRect(20, 455, 421, 21));
  16.  
  17. ...
  18. }
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I have the following code snippet for LineEdit and check box, in mainwindow.cpp file

Qt Code: 
  1. void MainWindow::on_filename_input_editingFinished()
  2. {
  3.     file_increment=0;
  4.     QString text;
  5.     text=ui->filename_input->text();
  6.  
  7.     QString s = QString::number(file_increment);
  8.  
  9.     filename = "/logs/" + QString(text) + "_" + s + ".csv";
  10.  
  11.     ui->current_logfile_label->setText(filename);
  12.  
  13. }
  14.  
  15. void MainWindow::on_logging_clicked(bool checked)
  16. {
  17.     logging_flag=checked;
  18.     if(logging_flag)
  19.     {
  20.         file_increment++;
  21.     }
  22.     QString text;
  23.     text=ui->filename_input->text();
  24.  
  25.     QString s = QString::number(file_increment);
  26.  
  27.     filename = "/logs/" + QString(text) + "_" + s + ".csv";
  28.     ui->current_logfile_label->setText(filename);
  29. }
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