mainwindow.cpp Example File

tools/treemodelcompleter/mainwindow.cpp
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#include <QtWidgets>
#include "treemodelcompleter.h"
#include "mainwindow.h"

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

    completer = new TreeModelCompleter(this);
    completer->setModel(modelFromFile(":/resources/treemodel.txt"));
    completer->setSeparator(QLatin1String("."));
    QObject::connect(completer, SIGNAL(highlighted(QModelIndex)),
                     this, SLOT(highlight(QModelIndex)));

    QWidget *centralWidget = new QWidget;

    QLabel *modelLabel = new QLabel;
    modelLabel->setText(tr("Tree Model<br>(Double click items to edit)"));

    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"));
    caseCombo->setCurrentIndex(0);

    QLabel *separatorLabel = new QLabel;
    separatorLabel->setText(tr("Tree Separator"));

    QLineEdit *separatorLineEdit = new QLineEdit;
    separatorLineEdit->setText(completer->separator());
    connect(separatorLineEdit, SIGNAL(textChanged(QString)),
            completer, SLOT(setSeparator(QString)));

    QCheckBox *wrapCheckBox = new QCheckBox;
    wrapCheckBox->setText(tr("Wrap around completions"));
    wrapCheckBox->setChecked(completer->wrapAround());
    connect(wrapCheckBox, SIGNAL(clicked(bool)), completer, SLOT(setWrapAround(bool)));

    contentsLabel = new QLabel;
    contentsLabel->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
    connect(separatorLineEdit, SIGNAL(textChanged(QString)),
            this, SLOT(updateContentsLabel(QString)));

    treeView = new QTreeView;
    treeView->setModel(completer->model());
    treeView->header()->hide();
    treeView->expandAll();

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

    lineEdit = new QLineEdit;
    lineEdit->setCompleter(completer);

    QGridLayout *layout = new QGridLayout;
    layout->addWidget(modelLabel, 0, 0); layout->addWidget(treeView, 0, 1);
    layout->addWidget(modeLabel, 1, 0);  layout->addWidget(modeCombo, 1, 1);
    layout->addWidget(caseLabel, 2, 0);  layout->addWidget(caseCombo, 2, 1);
    layout->addWidget(separatorLabel, 3, 0); layout->addWidget(separatorLineEdit, 3, 1);
    layout->addWidget(wrapCheckBox, 4, 0);
    layout->addWidget(contentsLabel, 5, 0, 1, 2);
    layout->addWidget(lineEdit, 6, 0, 1, 2);
    centralWidget->setLayout(layout);
    setCentralWidget(centralWidget);

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

    setWindowTitle(tr("Tree Model Completer"));
    lineEdit->setFocus();
}

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);

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

    QStandardItemModel *model = new QStandardItemModel(completer);
    QVector<QStandardItem *> parents(10);
    parents[0] = model->invisibleRootItem();

    while (!file.atEnd()) {
        QString line = file.readLine();
        QString trimmedLine = line.trimmed();
        if (line.isEmpty() || trimmedLine.isEmpty())
            continue;

        QRegExp re("^\\s+");
        int nonws = re.indexIn(line);
        int level = 0;
        if (nonws == -1) {
            level = 0;
        } else {
            if (line.startsWith("\t")) {
                level = re.cap(0).length();
            } else {
                level = re.cap(0).length()/4;
            }
        }

        if (level+1 >= parents.size())
            parents.resize(parents.size()*2);

        QStandardItem *item = new QStandardItem;
        item->setText(trimmedLine);
        parents[level]->appendRow(item);
        parents[level+1] = item;
    }

#ifndef QT_NO_CURSOR
    QApplication::restoreOverrideCursor();
#endif

    return model;
}

void MainWindow::highlight(const QModelIndex &index)
{
    QAbstractItemModel *completionModel = completer->completionModel();
    QAbstractProxyModel *proxy = qobject_cast<QAbstractProxyModel *>(completionModel);
    if (!proxy)
        return;
    QModelIndex sourceIndex = proxy->mapToSource(index);
    treeView->selectionModel()->select(sourceIndex, QItemSelectionModel::ClearAndSelect | QItemSelectionModel::Rows);
    treeView->scrollTo(index);
}

void MainWindow::about()
{
    QMessageBox::about(this, tr("About"), tr("This example demonstrates how "
        "to use a QCompleter with a custom tree model."));
}

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

void MainWindow::updateContentsLabel(const QString& sep)
{
    contentsLabel->setText(tr("Type path from model above with items at each level separated by a '%1'").arg(sep));
}

© 2016 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.