mainwindow.cpp Example File

widgets/charactermap/mainwindow.cpp
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#include <QtWidgets> #include "characterwidget.h" #include "mainwindow.h" Q_DECLARE_METATYPE(QFontComboBox::FontFilter) MainWindow::MainWindow() { QMenu *fileMenu = menuBar()->addMenu(tr("File")); fileMenu->addAction(tr("Quit"), this, &QWidget::close); QMenu *helpMenu = menuBar()->addMenu(tr("&Help")); helpMenu->addAction(tr("Show Font Info"), this, &MainWindow::showInfo); helpMenu->addAction(tr("About &Qt"), qApp, &QApplication::aboutQt); QWidget *centralWidget = new QWidget; QLabel *filterLabel = new QLabel(tr("Filter:")); filterCombo = new QComboBox; filterCombo->addItem(tr("All"), QVariant::fromValue(QFontComboBox::AllFonts)); filterCombo->addItem(tr("Scalable"), QVariant::fromValue(QFontComboBox::ScalableFonts)); filterCombo->addItem(tr("Monospaced"), QVariant::fromValue(QFontComboBox::MonospacedFonts)); filterCombo->addItem(tr("Proportional"), QVariant::fromValue(QFontComboBox::ProportionalFonts)); filterCombo->setCurrentIndex(0); connect(filterCombo, QOverload<int>::of(&QComboBox::currentIndexChanged), this, &MainWindow::filterChanged); QLabel *fontLabel = new QLabel(tr("Font:")); fontCombo = new QFontComboBox; QLabel *sizeLabel = new QLabel(tr("Size:")); sizeCombo = new QComboBox; QLabel *styleLabel = new QLabel(tr("Style:")); styleCombo = new QComboBox; QLabel *fontMergingLabel = new QLabel(tr("Automatic Font Merging:")); fontMerging = new QCheckBox; fontMerging->setChecked(true); scrollArea = new QScrollArea; characterWidget = new CharacterWidget; scrollArea->setWidget(characterWidget); findStyles(fontCombo->currentFont()); findSizes(fontCombo->currentFont()); lineEdit = new QLineEdit; lineEdit->setClearButtonEnabled(true); #ifndef QT_NO_CLIPBOARD QPushButton *clipboardButton = new QPushButton(tr("&To clipboard")); #endif connect(fontCombo, &QFontComboBox::currentFontChanged, this, &MainWindow::findStyles); connect(fontCombo, &QFontComboBox::currentFontChanged, this, &MainWindow::findSizes); connect(fontCombo, &QFontComboBox::currentFontChanged, characterWidget, &CharacterWidget::updateFont); connect(sizeCombo, QOverload<const QString &>::of(&QComboBox::currentIndexChanged), characterWidget, &CharacterWidget::updateSize); connect(styleCombo, QOverload<const QString &>::of(&QComboBox::currentIndexChanged), characterWidget, &CharacterWidget::updateStyle); connect(characterWidget, &CharacterWidget::characterSelected, this, &MainWindow::insertCharacter); #ifndef QT_NO_CLIPBOARD connect(clipboardButton, &QAbstractButton::clicked, this, &MainWindow::updateClipboard); #endif connect(fontMerging, &QAbstractButton::toggled, characterWidget, &CharacterWidget::updateFontMerging); QHBoxLayout *controlsLayout = new QHBoxLayout; controlsLayout->addWidget(filterLabel); controlsLayout->addWidget(filterCombo, 1); controlsLayout->addWidget(fontLabel); controlsLayout->addWidget(fontCombo, 1); controlsLayout->addWidget(sizeLabel); controlsLayout->addWidget(sizeCombo, 1); controlsLayout->addWidget(styleLabel); controlsLayout->addWidget(styleCombo, 1); controlsLayout->addWidget(fontMergingLabel); controlsLayout->addWidget(fontMerging, 1); controlsLayout->addStretch(1); QHBoxLayout *lineLayout = new QHBoxLayout; lineLayout->addWidget(lineEdit, 1); lineLayout->addSpacing(12); #ifndef QT_NO_CLIPBOARD lineLayout->addWidget(clipboardButton); #endif QVBoxLayout *centralLayout = new QVBoxLayout; centralLayout->addLayout(controlsLayout); centralLayout->addWidget(scrollArea, 1); centralLayout->addSpacing(4); centralLayout->addLayout(lineLayout); centralWidget->setLayout(centralLayout); setCentralWidget(centralWidget); setWindowTitle(tr("Character Map")); } void MainWindow::findStyles(const QFont &font) { QFontDatabase fontDatabase; QString currentItem = styleCombo->currentText(); styleCombo->clear(); QString style; foreach (style, fontDatabase.styles(font.family())) styleCombo->addItem(style); int styleIndex = styleCombo->findText(currentItem); if (styleIndex == -1) styleCombo->setCurrentIndex(0); else styleCombo->setCurrentIndex(styleIndex); } void MainWindow::filterChanged(int f) { const QFontComboBox::FontFilter filter = filterCombo->itemData(f).value<QFontComboBox::FontFilter>(); fontCombo->setFontFilters(filter); statusBar()->showMessage(tr("%n font(s) found", 0, fontCombo->count())); } void MainWindow::findSizes(const QFont &font) { QFontDatabase fontDatabase; QString currentSize = sizeCombo->currentText(); { const QSignalBlocker blocker(sizeCombo); // sizeCombo signals are now blocked until end of scope sizeCombo->clear(); int size; if (fontDatabase.isSmoothlyScalable(font.family(), fontDatabase.styleString(font))) { foreach (size, QFontDatabase::standardSizes()) { sizeCombo->addItem(QVariant(size).toString()); sizeCombo->setEditable(true); } } else { foreach (size, fontDatabase.smoothSizes(font.family(), fontDatabase.styleString(font))) { sizeCombo->addItem(QVariant(size).toString()); sizeCombo->setEditable(false); } } } int sizeIndex = sizeCombo->findText(currentSize); if(sizeIndex == -1) sizeCombo->setCurrentIndex(qMax(0, sizeCombo->count() / 3)); else sizeCombo->setCurrentIndex(sizeIndex); } void MainWindow::insertCharacter(const QString &character) { lineEdit->insert(character); } #ifndef QT_NO_CLIPBOARD void MainWindow::updateClipboard() { QGuiApplication::clipboard()->setText(lineEdit->text(), QClipboard::Clipboard); QGuiApplication::clipboard()->setText(lineEdit->text(), QClipboard::Selection); } #endif class FontInfoDialog : public QDialog { public: explicit FontInfoDialog(QWidget *parent = Q_NULLPTR); private: QString text() const; }; FontInfoDialog::FontInfoDialog(QWidget *parent) : QDialog(parent) { setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint); QVBoxLayout *mainLayout = new QVBoxLayout(this); QPlainTextEdit *textEdit = new QPlainTextEdit(text(), this); textEdit->setReadOnly(true); textEdit->setFont(QFontDatabase::systemFont(QFontDatabase::FixedFont)); mainLayout->addWidget(textEdit); QDialogButtonBox *buttonBox = new QDialogButtonBox(QDialogButtonBox::Close, this); connect(buttonBox, &QDialogButtonBox::rejected, this, &QDialog::reject); mainLayout->addWidget(buttonBox); } QString FontInfoDialog::text() const { QString text; QTextStream str(&text); const QFont defaultFont = QFontDatabase::systemFont(QFontDatabase::GeneralFont); const QFont fixedFont = QFontDatabase::systemFont(QFontDatabase::FixedFont); const QFont titleFont = QFontDatabase::systemFont(QFontDatabase::TitleFont); const QFont smallestReadableFont = QFontDatabase::systemFont(QFontDatabase::SmallestReadableFont); str << "Qt " << QT_VERSION_STR << " on " << QGuiApplication::platformName() << ", " << logicalDpiX() << "DPI"; if (!qFuzzyCompare(devicePixelRatioF(), qreal(1))) str << ", device pixel ratio: " << devicePixelRatioF(); str << "\n\nDefault font : " << defaultFont.family() << ", " << defaultFont.pointSizeF() << "pt\n" << "Fixed font : " << fixedFont.family() << ", " << fixedFont.pointSizeF() << "pt\n" << "Title font : " << titleFont.family() << ", " << titleFont.pointSizeF() << "pt\n" << "Smallest font: " << smallestReadableFont.family() << ", " << smallestReadableFont.pointSizeF() << "pt\n"; return text; } void MainWindow::showInfo() { const QRect screenGeometry = QApplication::desktop()->screenGeometry(this); FontInfoDialog *dialog = new FontInfoDialog(this); dialog->setWindowTitle(tr("Fonts")); dialog->setAttribute(Qt::WA_DeleteOnClose); dialog->resize(screenGeometry.width() / 4, screenGeometry.height() / 4); dialog->show(); }

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