mainwindow.cpp Example File

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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 (! 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; QRegularExpression re("^\\s+"); QRegularExpressionMatch match = re.match(line); int nonws = match.capturedStart(); int level = 0; if (nonws == -1) { level = 0; } else { if (line.startsWith("\t")) { level = match.capturedLength(); } else { level = match.capturedLength()/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)); }

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