mainwindow.cpp Example File

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 #include <QtWidgets>
 #include "mainwindow.h"
 #include "textedit.h"

 MainWindow::MainWindow(QWidget *parent)
     : QMainWindow(parent), completer(0)
 {
     createMenu();

     completingTextEdit = new TextEdit;
     completer = new QCompleter(this);
     completer->setModel(modelFromFile(":/resources/wordlist.txt"));
     completer->setModelSorting(QCompleter::CaseInsensitivelySortedModel);
     completer->setCaseSensitivity(Qt::CaseInsensitive);
     completer->setWrapAround(false);
     completingTextEdit->setCompleter(completer);

     setCentralWidget(completingTextEdit);
     resize(500, 300);
     setWindowTitle(tr("Completer"));
 }

 void MainWindow::createMenu()
 {
     QAction *exitAction = new QAction(tr("Exit"), this);
     QAction *aboutAct = new QAction(tr("About"), this);
     QAction *aboutQtAct = new QAction(tr("About Qt"), this);

     connect(exitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
     connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));
     connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));

     QMenu* fileMenu = menuBar()->addMenu(tr("File"));
     fileMenu->addAction(exitAction);

     QMenu* helpMenu = menuBar()->addMenu(tr("About"));
     helpMenu->addAction(aboutAct);
     helpMenu->addAction(aboutQtAct);
 }

 QAbstractItemModel *MainWindow::modelFromFile(const QString& fileName)
 {
     QFile file(fileName);
     if (!file.open(QFile::ReadOnly))
         return new QStringListModel(completer);

 #ifndef QT_NO_CURSOR
     QApplication::setOverrideCursor(QCursor(Qt::WaitCursor));
 #endif
     QStringList words;

     while (!file.atEnd()) {
         QByteArray line = file.readLine();
         if (!line.isEmpty())
             words << line.trimmed();
     }

 #ifndef QT_NO_CURSOR
     QApplication::restoreOverrideCursor();
 #endif
     return new QStringListModel(words, completer);
 }

 void MainWindow::about()
 {
     QMessageBox::about(this, tr("About"), tr("This example demonstrates the "
         "different features of the QCompleter class."));
 }