#include "winnativeeventfilter.h" #include #include #include #include #ifdef QT_QUICK_LIB #include "framelessquickhelper.h" #include #endif #include #include int main(int argc, char *argv[]) { // High DPI scaling is enabled by default from Qt 6 #if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0)) // Windows: we are using the manifest file to get maximum compatibility // because some APIs are not supprted on old systems such as Windows 7 // and Windows 8. And once we have set the DPI awareness level in the // manifest file, any attemptation to try to change it through API will // fail. In other words, Qt won't be able to enable or disable high DPI // scaling or change the DPI awareness level once we have set it in the // manifest file. So the following two lines are uesless actually (However, // they are still useful on other platforms). QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling); QGuiApplication::setAttribute(Qt::AA_UseHighDpiPixmaps); #endif #if (QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)) #if 0 QGuiApplication::setHighDpiScaleFactorRoundingPolicy( Qt::HighDpiScaleFactorRoundingPolicy::Round); #else // Don't round the scale factor. // This will break QWidget applications because they can't render correctly. // Qt Quick applications won't have this issue. QGuiApplication::setHighDpiScaleFactorRoundingPolicy( Qt::HighDpiScaleFactorRoundingPolicy::PassThrough); #endif #endif QApplication application(argc, argv); // Qt Widgets example: QWidget widget; widget.setContentsMargins(0, 0, 0, 0); QLabel *label = new QLabel; QObject::connect(&widget, &QWidget::windowTitleChanged, label, &QLabel::setText); QPushButton *minimizeButton = new QPushButton; minimizeButton->setText(QObject::tr("Minimize")); QObject::connect(minimizeButton, &QPushButton::clicked, &widget, &QWidget::showMinimized); QPushButton *maximizeButton = new QPushButton; maximizeButton->setText(QObject::tr("Maximize")); QObject::connect(maximizeButton, &QPushButton::clicked, [&widget, &maximizeButton]() { if (widget.isMaximized()) { widget.showNormal(); maximizeButton->setText(QObject::tr("Maximize")); } else { widget.showMaximized(); maximizeButton->setText(QObject::tr("Restore")); } }); QPushButton *closeButton = new QPushButton; closeButton->setText(QObject::tr("Close")); QObject::connect(closeButton, &QPushButton::clicked, &widget, &QWidget::close); QHBoxLayout *tbLayout = new QHBoxLayout; tbLayout->setContentsMargins(0, 0, 0, 0); tbLayout->setSpacing(0); tbLayout->addSpacing(15); tbLayout->addWidget(label); tbLayout->addStretch(); tbLayout->addWidget(minimizeButton); tbLayout->addWidget(maximizeButton); tbLayout->addWidget(closeButton); QVBoxLayout *mainLayout = new QVBoxLayout; mainLayout->setContentsMargins(0, 0, 0, 0); mainLayout->setSpacing(0); mainLayout->addLayout(tbLayout); mainLayout->addStretch(); widget.setLayout(mainLayout); widget.setWindowTitle(QObject::tr("Hello, World!")); const auto hWnd_widget = reinterpret_cast(widget.winId()); WinNativeEventFilter::addFramelessWindow(hWnd_widget); const auto data_widget = WinNativeEventFilter::windowData(hWnd_widget); if (data_widget) { data_widget->ignoreObjects << minimizeButton << maximizeButton << closeButton; } widget.resize(800, 600); WinNativeEventFilter::moveWindowToDesktopCenter(hWnd_widget); widget.show(); #ifdef QT_QUICK_LIB // Qt Quick example: QQmlApplicationEngine engine; qmlRegisterType("wangwenx190.Utils", 1, 0, "FramelessHelper"); const QUrl mainQmlUrl(QString::fromUtf8("qrc:///qml/main.qml")); const QMetaObject::Connection connection = QObject::connect( &engine, &QQmlApplicationEngine::objectCreated, &application, [&mainQmlUrl, &connection](QObject *object, const QUrl &url) { if (url != mainQmlUrl) { return; } if (!object) { QGuiApplication::exit(-1); } else { QObject::disconnect(connection); } }, Qt::QueuedConnection); engine.load(mainQmlUrl); #endif return QApplication::exec(); }