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# mainwindow.cpp Example File
tools/completer/mainwindow.cpp

        /****************************************************************************
        **
        ** Copyright (C) 2006-2006 Trolltech ASA. All rights reserved.
        **
        ** This file is part of the example classes of the Qt Toolkit.
        **
        ** Licensees holding valid Qt Preview licenses may use this file in
        ** accordance with the Qt Preview License Agreement provided with the
        ** Software.
        **
        ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
        ** information about Qt Commercial License Agreements.
        **
        ** Contact info@trolltech.com if any conditions of this licensing are
        ** not clear to you.
        **
        ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
        ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        **
        ****************************************************************************/

        #include <QtGui>
        #include "dirmodel.h"
        #include "mainwindow.h"

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

            QWidget *centralWidget = new QWidget;
            lineEdit = new QLineEdit;

            QLabel *modelLabel = new QLabel;
            modelLabel->setText(tr("Model"));

            modelCombo = new QComboBox;
            modelCombo->addItem(tr("QDirModel"));
            modelCombo->addItem(tr("QDirModel that shows full path"));
            modelCombo->addItem(tr("Country list"));
            modelCombo->addItem(tr("Word list"));
            modelCombo->setCurrentIndex(0);

            QLabel *modeLabel = new QLabel;
            modeLabel->setText(tr("Completion Mode"));
            modeCombo = new QComboBox;
            modeCombo->addItem(tr("Inline"));
            modeCombo->addItem(tr("Filtered Popup"));
            modeCombo->addItem(tr("Unfiltered Popup"));
            modeCombo->setCurrentIndex(1);

            QLabel *caseLabel = new QLabel;
            caseLabel->setText(tr("Case Sensitivity"));
            caseCombo = new QComboBox;
            caseCombo->addItem(tr("Case Insensitive"));
            caseCombo->addItem(tr("Case Sensitive"));
        #ifdef Q_OS_WIN
            caseCombo->setCurrentIndex(0);
        #else
            caseCombo->setCurrentIndex(1);
        #endif

            contentsLabel = new QLabel;
            contentsLabel->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
            progressLabel = new QLabel;

            progressBar = new QProgressBar;
            progressBar->setMinimum(0);
            progressBar->hide();

            connect(modelCombo, SIGNAL(activated(int)), this, SLOT(updateModel()));
            connect(modeCombo, SIGNAL(activated(int)), this, SLOT(changeMode(int)));
            connect(caseCombo, SIGNAL(activated(int)), this, SLOT(changeCase(int)));

            QGridLayout *layout = new QGridLayout;
            layout->addWidget(modelLabel, 0, 0); layout->addWidget(modelCombo, 0, 1);
            layout->addWidget(modeLabel, 1, 0);  layout->addWidget(modeCombo, 1, 1);
            layout->addWidget(caseLabel, 2, 0);  layout->addWidget(caseCombo, 2, 1);
            layout->addWidget(contentsLabel, 3, 0, 1, 2);
            layout->addWidget(lineEdit, 4, 0, 1, 2);
            layout->addWidget(progressLabel, 5, 0, 1, 2);
            layout->addWidget(progressBar, 6, 0, 1, 2);

            centralWidget->setLayout(layout);
            setCentralWidget(centralWidget);

            updateModel();
            changeCase(caseCombo->currentIndex());
            changeMode(modeCombo->currentIndex());

            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);
        }

        void MainWindow::changeMode(int index)
        {
            QCompleter::CompletionMode mode;
            if (index == 0)
                mode = QCompleter::InlineCompletion;
            else if (index == 1)
                mode = QCompleter::PopupCompletion;
            else
                mode = QCompleter::UnfilteredPopupCompletion;

            completer->setCompletionMode(mode);
        }

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

            int sz = file.size();
            int est_words = sz/10;
            QApplication::setOverrideCursor(QCursor(Qt::WaitCursor));
            progressLabel->setText(tr("Reading model data"));
            progressBar->setMinimum(0);
            progressBar->setMaximum(est_words);
            progressBar->setValue(0);
            progressLabel->show();
            progressBar->show();
            qApp->processEvents(0);

            QStringList words;

            for(int num_words = 0;;++num_words) {
                QByteArray line = file.readLine();
                if (line.isEmpty())
                    break;
                words << line.trimmed();
                if (num_words % 300) {
                    progressBar->setValue(num_words);
                }
            }

            progressLabel->hide();
            progressBar->hide();
            QApplication::restoreOverrideCursor();

            if (!fileName.contains(QLatin1String("countries.txt")))
                return new QStringListModel(words, completer);

            // The last two chars of the countries.txt file indicate the country
            // symbol. We put that in column 2 of a standard item model
            QStandardItemModel *m = new QStandardItemModel(words.count(), 2, completer);
            for (int i = 0; i < words.count(); ++i) {
                QModelIndex countryIdx = m->index(i, 0);
                QModelIndex symbolIdx = m->index(i, 1);
                QString country = words[i].mid(0, words[i].length() - 2).trimmed();
                QString symbol = words[i].right(2);
                m->setData(countryIdx, country);
                m->setData(symbolIdx, symbol);
            }

            return m;
        }

        void MainWindow::updateModel()
        {
            if (completer) {
                lineEdit->setCompleter(0);
                delete completer;
            }
            completer = new QCompleter(this);
            lineEdit->setCompleter(completer);

            switch (modelCombo->currentIndex()) {
            default:
            case 0:
                { // Unsorted QDirModel
                    QDirModel *dirModel = new QDirModel(completer);
                    completer->setModel(dirModel);
                    contentsLabel->setText(tr("Enter file path"));
                }
                break;
            case 1:
                { // DirModel that shows full paths
                    DirModel *dirModel = new DirModel(completer);
                    completer->setModel(dirModel);
                    contentsLabel->setText(tr("Enter file path"));
                }
                break;
            case 2:
                { // Country List
                    completer->setModel(modelFromFile(":/resources/countries.txt"));
                    QTreeView *treeView = new QTreeView;
                    completer->setPopup(treeView);
                    treeView->setRootIsDecorated(false);
                    treeView->header()->hide();
                    treeView->resizeColumnToContents(0);
                    contentsLabel->setText(tr("Enter name of your country"));
                }
                break;
            case 3:
                { // Word list
                    completer->setModel(modelFromFile(":/resources/wordlist.txt"));
                    completer->setModelSorting(QCompleter::CaseInsensitivelySortedModel);
                    contentsLabel->setText(tr("Enter a word"));
                }
                break;
            }

            changeCase(caseCombo->currentIndex());
            changeMode(modeCombo->currentIndex());
        }

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

        void MainWindow::changeCase(int cs)
        {
            completer->setCaseSensitivity(cs ? Qt::CaseSensitive : Qt::CaseInsensitive);
        }