qx11embed_x11.cpp

奇趣公司比较新的qt/emd版本

class QX11EmbedWidgetPrivate : public QWidgetPrivate
{
    Q_DECLARE_PUBLIC(QX11EmbedWidget)
public:
    inline QX11EmbedWidgetPrivate()
    {
        container = 0;
    }

    void setEmbedded();

    void emitError(QX11EmbedWidget::Error error) {
        Q_Q(QX11EmbedWidget);

        lastError = error;
        emit q->error(error);
    }

    enum FocusWidgets {
        FirstFocusWidget,
        LastFocusWidget
    };

    int focusOriginator;
    QWidget *getFocusWidget(FocusWidgets fw);
    void checkActivateWindow(QObject *o);
    QX11EmbedWidget *xEmbedWidget(QObject *o) const;
    void clearFocus();

    WId container;
    QPointer<QWidget> currentFocus;

    QX11EmbedWidget::Error lastError;

};

/*!
    Constructs a QX11EmbedWidget object with the given \a parent.
*/
QX11EmbedWidget::QX11EmbedWidget(QWidget *parent)
    : QWidget(*new QX11EmbedWidgetPrivate, parent, 0)
{
    XSetErrorHandler(x11ErrorHandler);
    initXEmbedAtoms(x11Info().display());

    createWinId();
    XSelectInput(x11Info().display(), internalWinId(),
                 KeyPressMask | KeyReleaseMask | ButtonPressMask
                    | ButtonReleaseMask
                    | KeymapStateMask | ButtonMotionMask | PointerMotionMask
                    | FocusChangeMask
                    | ExposureMask | StructureNotifyMask
                    | SubstructureNotifyMask | PropertyChangeMask);

    unsigned int data[] = {XEMBED_VERSION, XEMBED_MAPPED};
    XChangeProperty(x11Info().display(), internalWinId(), _XEMBED_INFO,
                    _XEMBED_INFO, 32, PropModeReplace,
                    (unsigned char*) data, 2);

    setFocusPolicy(Qt::StrongFocus);
    setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
    QApplication::instance()->installEventFilter(this);

#ifdef QX11EMBED_DEBUG
    qDebug() << "QX11EmbedWidget::QX11EmbedWidget: constructed client"
             << (void *)this << "with winId" << winId();
#endif
}

/*!
    Destructs the QX11EmbedWidget object. If the widget is embedded
    when deleted, it is hidden and then detached from its container,
    so that the container is free to embed a new widget.
*/
QX11EmbedWidget::~QX11EmbedWidget()
{
    Q_D(QX11EmbedWidget);
    if (d->container) {
#ifdef QX11EMBED_DEBUG
        qDebug() << "QX11EmbedWidget::~QX11EmbedWidget: unmapping"
                 << (void *)this << "with winId" << winId()
                 << "from container with winId" << d->container;
#endif
        XUnmapWindow(x11Info().display(), internalWinId());
        XReparentWindow(x11Info().display(), internalWinId(), x11Info().appRootWindow(), 0, 0);
    }

#ifdef QX11EMBED_DEBUG
    qDebug() << "QX11EmbedWidget::~QX11EmbedWidget: destructed client"
             << (void *)this << "with winId" << winId();
#endif
}

/*!
    Returns the type of error that occurred last. This is the same error code
    that is emitted by the error() signal.

    \sa Error
*/
QX11EmbedWidget::Error QX11EmbedWidget::error() const
{
    return d_func()->lastError;
}

/*!
    When this function is called, the widget embeds itself into the
    container whose window ID is \a id.

    If \a id is \e not the window ID of a container this function will
    behave unpredictably.
*/
void QX11EmbedWidget::embedInto(WId id)
{
    Q_D(QX11EmbedWidget);
#ifdef QX11EMBED_DEBUG
    qDebug() << "QX11EmbedWidget::embedInto: embedding client"
             << (void *)this << "with winId" << winId() << "into container"
             << id;
#endif

    d->container = id;
    switch (XReparentWindow(x11Info().display(), internalWinId(), d->container, 0, 0)) {
    case BadWindow:
        d->emitError(InvalidWindowID);
        break;
    case BadMatch:
        d->emitError(Internal);
        break;
    case Success:
    default:
        break;
    }
    QTLWExtra* x = d->extra ? d->extra->topextra : 0;
    if (x)
        x->frameStrut.setCoords(0, 0, 0, 0);
    d->data.fstrut_dirty = false;
}

/*! \internal

    Gets the first or last child widget that can get focus.
*/
QWidget *QX11EmbedWidgetPrivate::getFocusWidget(FocusWidgets fw)
{
    Q_Q(QX11EmbedWidget);
    QWidget *tlw = q;
    QWidget *w = tlw->nextInFocusChain();

    QWidget *last = tlw;

    extern bool qt_tab_all_widgets;
    uint focus_flag = qt_tab_all_widgets ? Qt::TabFocus : Qt::StrongFocus;

    while (w != tlw)
    {
        if (((w->focusPolicy() & focus_flag) == focus_flag)
            && w->isVisibleTo(q) && w->isEnabled())
        {
            last = w;
            if (fw == FirstFocusWidget)
                break;
        }
        w = w->nextInFocusChain();
    }

    return last;
}

/*! \internal

    Returns the xembed widget that the widget is a child of
*/
QX11EmbedWidget *QX11EmbedWidgetPrivate::xEmbedWidget(QObject *o) const
{
    QX11EmbedWidget *xec = 0;

    // Check the widget itself, then its parents, and find the first
    // QX11EmbedWidget.
    do {
        if ((xec = qobject_cast<QX11EmbedWidget *>(o)))
            return xec;
    } while ((o = o->parent()));
    return 0;
}

/*! \internal

    Checks the active window.
*/
void QX11EmbedWidgetPrivate::checkActivateWindow(QObject *o)
{
    Q_Q(QX11EmbedWidget);
    QX11EmbedWidget *xec = xEmbedWidget(o);

    // check if we are in the right xembed client
    if (q != xec)
        return;

    QWidget *w = qobject_cast<QWidget *>(o);

    // if it is no active window, then don't do the change
    if (!(w && qApp->activeWindow()))
        return;

    // if it already is the active window, don't do anything
    if (w->window() != qApp->activeWindow())
    {
        qApp->setActiveWindow(w->window());
        currentFocus = w;

        sendXEmbedMessage(xec->containerWinId(), q->x11Info().display(), XEMBED_REQUEST_FOCUS);
    }
}

/*! \internal

    Clears the focus
*/
void QX11EmbedWidgetPrivate::clearFocus()
{
    Q_Q(QX11EmbedWidget);
    // Setting focus on the client itself removes Qt's
    // logical focus rectangle. We can't just do a
    // clearFocus here, because when we send the synthetic
    // FocusIn to ourselves on activation, Qt will set
    // focus on focusWidget() again. This way, we "hide"
    // focus rather than clearing it.

    if (!q->window()->hasFocus())
        q->window()->setFocus(Qt::OtherFocusReason);

    currentFocus = 0;
}

/*! \internal

    Sets the embedded flag on the client.
*/
void QX11EmbedWidgetPrivate::setEmbedded()
{
    Q_Q(QX11EmbedWidget);
    ((QHackWidget *)q->window())->topData()->embedded = 1;
}

/*! \internal

    Handles WindowActivate and FocusIn events for the client.
*/
bool QX11EmbedWidget::eventFilter(QObject *o, QEvent *event)
{
    Q_D(QX11EmbedWidget);
    switch (event->type()) {
    case QEvent::FocusIn:
        switch (((QFocusEvent *)event)->reason()) {
        case Qt::MouseFocusReason:
            // If the user clicks into one of the client widget's
            // children and we didn't have focus already, we request
            // focus from our container.
            if (d->xEmbedWidget(o) == this) {
                if (d->currentFocus.isNull())
                    sendXEmbedMessage(d->container, x11Info().display(), XEMBED_REQUEST_FOCUS);

                d->currentFocus = qobject_cast<QWidget *>(o);
            }
            break;
        case Qt::TabFocusReason:
            // If the xembed client receives a focus event because of
            // a Tab, then we are at the end of our focus chain and we
            // ask the container to move to its next focus widget.
            if (o == this) {
                d->clearFocus();
                sendXEmbedMessage(d->container, x11Info().display(), XEMBED_FOCUS_NEXT);
                return true;
            } else {
                // We're listening on events from qApp, so in order
                // for us to know who to set focus on if we receive an
                // activation event, we note the widget that got the
                // focusin last.
                if (d->xEmbedWidget(o) == this)
                    d->currentFocus = qobject_cast<QWidget *>(o);
            }
            break;
        case Qt::BacktabFocusReason:
            // If the window receives a focus event because of
            // a Backtab, then we are at the start of our focus chain
            // and we ask the container to move to its previous focus
            // widget.
            if (o == this) {
                // See comment for Tab.
                // If we receive a XEMBED_FOCUS_IN
                // XEMBED_FOCUS_CURRENT, we will set focus in
                // currentFocus. To avoid that in this case, we reset
                // currentFocus.
                d->clearFocus();
                sendXEmbedMessage(d->container, x11Info().display(), XEMBED_FOCUS_PREV);
                return true;
            } else {
                if (d->xEmbedWidget(o) == this)
                    d->currentFocus = qobject_cast<QWidget *>(o);
            }
            break;
        case Qt::ActiveWindowFocusReason:
            if (!d->currentFocus.isNull()) {
                if (!d->currentFocus->hasFocus())
                    d->currentFocus->setFocus(Qt::OtherFocusReason);
            } else {
                d->clearFocus();
                return true;
            }

            break;
        case Qt::PopupFocusReason:
        case Qt::ShortcutFocusReason:
        case Qt::OtherFocusReason:
            // If focus is received to any child widget because of any
            // other reason, remember the widget so that we can give
            // it focus again if we're activated.
            if (d->xEmbedWidget(o) == this) {
               d->currentFocus = qobject_cast<QWidget *>(o);
            }
            break;
        default:
            break;
        }
        break;
    case QEvent::MouseButtonPress:
        // If we get a mouse button press event inside a embedded widget
        // make sure this is the active window in qapp.
        d->checkActivateWindow(o);
        break;
    default:
        break;
    }

    return QWidget::eventFilter(o, event);
}

/*! \internal

    Handles some notification events and client messages. Client side
    XEmbed message receiving is also handled here.
*/
bool QX11EmbedWidget::x11Event(XEvent *event)
{
    Q_D(QX11EmbedWidget);
    switch (event->type) {
    case DestroyNotify:
#ifdef QX11EMBED_DEBUG
        qDebug() << "QX11EmbedWidget::x11Event: client"
                 << (void *)this << "with winId" << winId()
                 << "received a DestroyNotify";
#endif
        // If the container window is destroyed, we signal this to the user.
        d->container = 0;
        emit containerClosed();
        break;
    case ReparentNotify:
#ifdef QX11EMBED_DEBUG
        qDebug() << "QX11EmbedWidget::x11Event: client"
                 << (void *)this << "with winId" << winId()
                 << "received a ReparentNotify to"
                 << ((event->xreparent.parent == x11Info().appRootWindow())
                     ? QString::fromLatin1("root") : QString::number(event->xreparent.parent));
#endif
        // If the container shuts down, we will be reparented to the
        // root window. We must also consider the case that we may be
        // reparented from one container to another.
        if (event->xreparent.parent == x11Info().appRootWindow()) {
            if (((QHackWidget *)this)->topData()->embedded) {
                d->container = 0;
                emit containerClosed();
            }
            return true;
        } else {
            d->container = event->xreparent.parent;
        }
        break;
    case UnmapNotify:
        // Mapping and unmapping are handled by changes to the
        // _XEMBED_INFO property. Any default map/unmap requests are
        // ignored.
        return true;
    case PropertyNotify:
        // The container sends us map/unmap messages through the
        // _XEMBED_INFO property. We adhere to the XEMBED_MAPPED bit in
        // data2.
        if (event->xproperty.atom == _XEMBED_INFO) {
            Atom actual_type_return;
            int actual_format_return;
            unsigned long nitems_return;
            unsigned long bytes_after_return;
            unsigned char *prop_return = 0;
            if (XGetWindowProperty(x11Info().display(), internalWinId(), _XEMBED_INFO, 0, 2,
                                   false, _XEMBED_INFO, &actual_type_return,
                                   &actual_format_return, &nitems_return,
                                   &bytes_after_return, &prop_return) == Success) {
                if (nitems_return > 1) {
                    if (((int * )prop_return)[1] & XEMBED_MAPPED) {
                        XMapWindow(x11Info().display(), internalWinId());
                    } else {
                        XUnmapWindow(x11Info().display(), internalWinId());
                    }
                }
            }
        }

        break;
    case ClientMessage:
        // XEMBED messages have message_type _XEMBED
        if (event->xclient.message_type == _XEMBED) {
            // Discard XEMBED messages not to ourselves. (### dead code?)
            if (event->xclient.window != internalWinId())
                break;

            // Update qt_x_time if necessary
            Time msgtime = (Time) event->xclient.data.l[0];
            if (msgtime > X11->time)
                X11->time = msgtime;

            switch (event->xclient.data.l[1]) {
            case XEMBED_WINDOW_ACTIVATE: {
                // When we receive an XEMBED_WINDOW_ACTIVATE, we need
                // to send ourselves a synthetic FocusIn X11 event for
                // Qt to activate us.
                XEvent ev;
                memset(&ev, 0, sizeof(ev));
                ev.xfocus.display = x11Info().display();
                ev.xfocus.type = XFocusIn;
                ev.xfocus.window = internalWinId();
                ev.xfocus.mode = NotifyNormal;
                ev.xfocus.detail = NotifyNonlinear;
                ((QApplication *)QApplication::instance())->x11ProcessEvent(&ev);
            }
                break;
            case XEMBED_WINDOW_DEACTIVATE: {
                // When we receive an XEMBED_WINDOW_DEACTIVATE, we
                // need to send ourselves a synthetic FocusOut event
                // for Qt to deativate us.
                XEvent ev;
                memset(&ev, 0, sizeof(ev));
                ev.xfocus.display = x11Info().display();
                ev.xfocus.type = XFocusOut;
                ev.xfocus.window = internalWinId();
                ev.xfocus.mode = NotifyNormal;
                ev.xfocus.detail = NotifyNonlinear;
                ((QApplication *)QApplication::instance())->x11ProcessEvent(&ev);
            }
                break;
            case XEMBED_EMBEDDED_NOTIFY: {
#ifdef QX11EMBED_DEBUG
                qDebug() << "QX11EmbedWidget::x11Event: client"
                         << (void *)this << "with winId" << winId()
                         << "received an XEMBED EMBEDDED NOTIFY message";