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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), comboBox(0), lineEdit(0)
    {
        createMenu();

        QWidget *centralWidget = new QWidget;

        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);

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

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

        setWindowTitle(tr("Completer"));
    }

    void MainWindow::createMenu()
    {
        QAction *comboAction = new QAction(tr("Show QComboBox"), this);
        comboAction->setCheckable(true);
        QAction *exitAction = new QAction(tr("Exit"), this);
        QAction *aboutAct = new QAction(tr("About"), this);
        QAction *aboutQtAct = new QAction(tr("About Qt"), this);

        connect(comboAction, SIGNAL(toggled(bool)), this, SLOT(useComboBox(bool)));
        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(comboAction);
        fileMenu->addSeparator();
        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);

        QApplication::setOverrideCursor(QCursor(Qt::WaitCursor));
        QStringList words;

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

        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) {
            comboBox ? comboBox->setCompleter(0) : lineEdit->setCompleter(0);
            delete completer;
        }
        completer = new QCompleter(this);
        comboBox ? comboBox->setCompleter(completer) : 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::useComboBox(bool combo)
    {
        if ((comboBox && combo) || (lineEdit && !combo))
            return;
        if (combo) {
            delete lineEdit;
            lineEdit = 0;
            comboBox = new QComboBox;
            comboBox->setEditable(true);
            comboBox->setCompleter(completer);
            (static_cast<QGridLayout *>(centralWidget()->layout()))->addWidget(comboBox, 4, 0, 1, 2);
        } else {
            delete comboBox;
            comboBox = 0;
            lineEdit = new QLineEdit;
            lineEdit->setCompleter(completer);
            (static_cast<QGridLayout *>(centralWidget()->layout()))->addWidget(lineEdit, 4, 0, 1, 2);
        }
    }

    void MainWindow::about()
    {
        QMessageBox::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);
    }