[Qt-interest] What is the use of QCoreApplication::processEvents()

[shariff]

Hi everybody,

Can any one explain me the exact use of 
void QCoreApplication::processEvents ( QEventLoop::ProcessEventsFlags flags = QEventLoop::AllEvents ) 

I have gone through the docs.... but I cannot understand the actual use of it. 
It was used in "Find Files" example in relation with Progress dialog updation.

Code:

QStringList Window::findFiles(const QDir &directory, const QStringList &files,
                               const QString &text)
 {
     QProgressDialog progressDialog(this);
     progressDialog.setCancelButtonText(tr("&Cancel"));
     progressDialog.setRange(0, files.size());
     progressDialog.setWindowTitle(tr("Find Files"));

     QStringList foundFiles;

     for (int i = 0; i < files.size(); ++i) {
         progressDialog.setValue(i);
         progressDialog.setLabelText(tr("Searching file number %1 of %2...")
                                     .arg(i).arg(files.size()));
         qApp->processEvents();

         if (progressDialog.wasCanceled())
             break;

         QFile file(directory.absoluteFilePath(files[i]));

         if (file.open(QIODevice::ReadOnly)) {
             QString line;
             QTextStream in(&file);
             while (!in.atEnd()) {
                 if (progressDialog.wasCanceled())
                     break;
                 line = in.readLine();
                 if (line.contains(text)) {
                     foundFiles << files[i];
                     break;
                 }
             }
         }
     }
     return foundFiles;
 }


What is the link between QProgress bar dialog updation and qApp->processEvents() in the above code? When I commented "qApp->processEvents()" below lines of code is not being executed.

     progressDialog.setCancelButtonText(tr("&Cancel"));
     progressDialog.setRange(0, files.size());
     progressDialog.setWindowTitle(tr("Find Files"));

Thanks in advance

Regards,
Shariff


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