Method grabFocus

src/SFML/Window/Unix/WindowImplX11.cpp:1354–1396

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void WindowImplX11::grabFocus()
{
    using namespace WindowImplX11Impl;

    // Only try to grab focus if the window is mapped
    XWindowAttributes attr;

    XGetWindowAttributes(m_display.get(), m_window, &attr);

    if (attr.map_state == IsUnmapped)
        return;

    static const auto netActiveWindow = isFeatureSupported("_NET_ACTIVE_WINDOW") ? getAtom("_NET_ACTIVE_WINDOW") : None;

    if (netActiveWindow)
    {
        auto event                 = XEvent();
        event.type                 = ClientMessage;
        event.xclient.window       = m_window;
        event.xclient.format       = 32;
        event.xclient.message_type = netActiveWindow;
        event.xclient.data.l[0]    = 1; // Normal application
        event.xclient.data.l[1]    = static_cast<long>(m_lastInputTime);
        event.xclient.data.l[2]    = 0; // We don't know the currently active window

        const int result = XSendEvent(m_display.get(),
                                      DefaultRootWindow(m_display.get()),
                                      False,
                                      SubstructureNotifyMask | SubstructureRedirectMask,
                                      &event);

        XFlush(m_display.get());

        if (!result)
            err() << "Setting fullscreen failed, could not send \"_NET_ACTIVE_WINDOW\" event" << std::endl;
    }
    else
    {
        XRaiseWindow(m_display.get(), m_window);
        XSetInputFocus(m_display.get(), m_window, RevertToPointerRoot, CurrentTime);
        XFlush(m_display.get());
    }
}


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