Qt 4.8: mainwindow.cpp Example File (tools/customcompleter/mainwindow.cpp)

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# mainwindow.cpp Example File

tools/customcompleter/mainwindow.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2015 The Qt Company Ltd.
     ** Contact: http://www.qt.io/licensing/
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
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     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
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     **     contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
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     #include <QtGui>
     #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."));
     }