mainwindow.cpp Example File

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#include <QtWidgets> #include "fsmodel.h" #include "mainwindow.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), completer(0), lineEdit(0) { createMenu(); QWidget *centralWidget = new QWidget; QLabel *modelLabel = new QLabel; modelLabel->setText(tr("Model")); modelCombo = new QComboBox; modelCombo->addItem(tr("QFileSytemModel")); modelCombo->addItem(tr("QFileSytemModel 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")); caseCombo->setCurrentIndex(0); QLabel *maxVisibleLabel = new QLabel; maxVisibleLabel->setText(tr("Max Visible Items")); maxVisibleSpinBox = new QSpinBox; maxVisibleSpinBox->setRange(3,25); maxVisibleSpinBox->setValue(10); wrapCheckBox = new QCheckBox; wrapCheckBox->setText(tr("Wrap around completions")); wrapCheckBox->setChecked(true); contentsLabel = new QLabel; contentsLabel->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed); connect(modelCombo, SIGNAL(activated(int)), this, SLOT(changeModel())); connect(modeCombo, SIGNAL(activated(int)), this, SLOT(changeMode(int))); connect(caseCombo, SIGNAL(activated(int)), this, SLOT(changeCase(int))); connect(maxVisibleSpinBox, SIGNAL(valueChanged(int)), this, SLOT(changeMaxVisible(int))); lineEdit = new QLineEdit; 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(maxVisibleLabel, 3, 0); layout->addWidget(maxVisibleSpinBox, 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); changeModel(); setWindowTitle(tr("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); } 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; while (!file.atEnd()) { QByteArray line = file.readLine(); if (!line.isEmpty()) words << line.trimmed(); } #ifndef QT_NO_CURSOR QApplication::restoreOverrideCursor(); #endif 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::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); } void MainWindow::changeCase(int cs) { completer->setCaseSensitivity(cs ? Qt::CaseSensitive : Qt::CaseInsensitive); } void MainWindow::changeModel() { delete completer; completer = new QCompleter(this); completer->setMaxVisibleItems(maxVisibleSpinBox->value()); switch (modelCombo->currentIndex()) { default: case 0: { // Unsorted QFileSystemModel QFileSystemModel *fsModel = new QFileSystemModel(completer); fsModel->setRootPath(""); completer->setModel(fsModel); contentsLabel->setText(tr("Enter file path")); } break; case 1: { // FileSystemModel that shows full paths FileSystemModel *fsModel = new FileSystemModel(completer); completer->setModel(fsModel); fsModel->setRootPath(""); 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->header()->setStretchLastSection(false); treeView->header()->setSectionResizeMode(0, QHeaderView::Stretch); treeView->header()->setSectionResizeMode(1, QHeaderView::ResizeToContents); 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; } changeMode(modeCombo->currentIndex()); changeCase(caseCombo->currentIndex()); completer->setWrapAround(wrapCheckBox->isChecked()); lineEdit->setCompleter(completer); connect(wrapCheckBox, SIGNAL(clicked(bool)), completer, SLOT(setWrapAround(bool))); } void MainWindow::changeMaxVisible(int max) { completer->setMaxVisibleItems(max); } void MainWindow::about() { QMessageBox::about(this, tr("About"), tr("This example demonstrates the " "different features of the QCompleter class.")); }

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