C++ (Cpp) QWindow::installEventFilter Examples

Example #1

File: mnemonicattached.cpp Project: KDE/kirigami

MnemonicAttached::MnemonicAttached(QObject *parent)
    : QObject(parent)
{
    QQuickItem *parentItem = qobject_cast<QQuickItem *>(parent);
    if (parentItem) {
        if (parentItem->window()) {
            m_window = parentItem->window();
            m_window->installEventFilter(this);
        }
        connect(parentItem, &QQuickItem::windowChanged, this,
                [this](QQuickWindow *window) {
            if (m_window) {
                QWindow *renderWindow = QQuickRenderControl::renderWindowFor(m_window);
                if (renderWindow) {
                    renderWindow->removeEventFilter(this);
                } else {
                    m_window->removeEventFilter(this);
                }
            }
            m_window = window;
            if (m_window) {
                QWindow *renderWindow = QQuickRenderControl::renderWindowFor(m_window);
                //renderWindow means the widget is rendering somewhere else, like a QQuickWidget
                if (renderWindow && renderWindow != m_window) {
                    renderWindow->installEventFilter(this);
                } else {
                    m_window->installEventFilter(this);
                }
            }
        });
    }
}