qx11embed_x11.cpp

奇趣公司比较新的qt/emd版本

	    }
	}

	break;
    case QEvent::FocusOut: {
	// When receiving a FocusOut, we ask our client to remove its
	// focus.
	if (o == this && d->client) {
            if (!d->isEmbedded())
                d->moveInputToProxy();

	    if (d->clientIsXEmbed) {
		QFocusEvent *fe = (QFocusEvent *)event;
		if (o == this && d->client && fe->reason() != Qt::ActiveWindowFocusReason)
		    sendXEmbedMessage(d->client, x11Info().display(), XEMBED_FOCUS_OUT);
	    } else {
		d->checkGrab();
	    }
	}
    }
	break;

    case QEvent::Close: {
	if (o == this && d->client) {
	    // Unmap the client and reparent it to the root window.
	    // Wait until the messages have been processed. Then ask
	    // the window manager to delete the window.
	    XUnmapWindow(x11Info().display(), d->client);
	    XReparentWindow(x11Info().display(), d->client, x11Info().appRootWindow(), 0, 0);
	    XSync(x11Info().display(), false);

	    XEvent ev;
	    memset(&ev, 0, sizeof(ev));
	    ev.xclient.type = ClientMessage;
	    ev.xclient.window = d->client;
	    ev.xclient.message_type = ATOM(WM_PROTOCOLS);
	    ev.xclient.format = 32;
	    ev.xclient.data.s[0] = ATOM(WM_DELETE_WINDOW);
	    XSendEvent(x11Info().display(), d->client, false, NoEventMask, &ev);

	    XFlush(x11Info().display());
	    d->client = 0;
	    d->clientIsXEmbed = false;
            d->wmMinimumSizeHint = QSize();
            updateGeometry();
            setEnabled(false);
	    update();

	    emit clientClosed();
	}
    }
    default:
	break;
    }

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

/*! \internal

    Handles X11 events for the container.
*/
bool QX11EmbedContainer::x11Event(XEvent *event)
{
    Q_D(QX11EmbedContainer);

    switch (event->type) {
    case CreateNotify:
	// The client created an embedded window.
	if (d->client)
	    d->rejectClient(event->xcreatewindow.window);
	else
	    d->acceptClient(event->xcreatewindow.window);
      break;
    case DestroyNotify:
	if (event->xdestroywindow.window == d->client) {
	    // The client died.
	    d->client = 0;
	    d->clientIsXEmbed = false;
            d->wmMinimumSizeHint = QSize();
            updateGeometry();
	    update();
            setEnabled(false);
	    emit clientClosed();
	}
        break;
    case ReparentNotify:
	// The client sends us this if it reparents itself out of our
	// widget.
	if (event->xreparent.window == d->client && event->xreparent.parent != internalWinId()) {
	    d->client = 0;
	    d->clientIsXEmbed = false;
            d->wmMinimumSizeHint = QSize();
            updateGeometry();
	    update();
            setEnabled(false);
	    emit clientClosed();
	} else if (event->xreparent.parent == internalWinId()) {
	    // The client reparented itself into this window.
	    if (d->client)
		d->rejectClient(event->xreparent.window);
	    else
		d->acceptClient(event->xreparent.window);
	}
	break;
    case ClientMessage: {
	if (event->xclient.message_type == _XEMBED) {
	    // Ignore XEMBED messages not to ourselves
	    if (event->xclient.window != internalWinId())
		break;

	    // Receiving an XEmbed message means the client
	    // is an XEmbed client.
	    d->clientIsXEmbed = true;

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

	    switch (event->xclient.data.l[1]) {
	    case XEMBED_REQUEST_FOCUS: {
		// This typically happens when the client gets focus
		// because of a mouse click.
		if (!hasFocus())
		    setFocus(Qt::OtherFocusReason);

		// The message is passed along to the topmost container
		// that eventually responds with a XEMBED_FOCUS_IN
		// message. The focus in message is passed all the way
		// back until it reaches the original focus
		// requestor. In the end, not only the original client
		// has focus, but also all its ancestor containers.
		if (d->isEmbedded()) {
                    // If our window's embedded flag is set, then
		    // that suggests that we are part of a client. The
		    // parentWinId will then point to an container to whom
		    // we must pass this message.
		    sendXEmbedMessage(d->topLevelParentWinId(), x11Info().display(), XEMBED_REQUEST_FOCUS);
		} else {
                    // Our window's embedded flag is not set,
		    // so we are the topmost container. We respond to
		    // the focus request message with a focus in
		    // message. This message will pass on from client
		    // to container to client until it reaches the
		    // originator of the XEMBED_REQUEST_FOCUS message.
		    sendXEmbedMessage(d->client, x11Info().display(), XEMBED_FOCUS_IN, XEMBED_FOCUS_CURRENT);
		}

		break;
	    }
	    case XEMBED_FOCUS_NEXT:
		// Client sends this event when it received a tab
		// forward and was at the end of its focus chain. If
		// we are the only widget in the focus chain, we send
		// ourselves a FocusIn event.
                if (d->focus_next != this) {
		    focusNextPrevChild(true);
                } else {
                    QFocusEvent event(QEvent::FocusIn, Qt::TabFocusReason);
                    qApp->sendEvent(this, &event);
                }

		break;
	    case XEMBED_FOCUS_PREV:
		// Client sends this event when it received a backtab
		// and was at the start of its focus chain. If we are
		// the only widget in the focus chain, we send
		// ourselves a FocusIn event.
                if (d->focus_next != this) {
		    focusNextPrevChild(false);
                } else {
                    QFocusEvent event(QEvent::FocusIn, Qt::BacktabFocusReason);
                    qApp->sendEvent(this, &event);
                }

		break;
	    default:
		break;
	    }
	}
    }
	break;
    case XButtonPress:
	if (!d->clientIsXEmbed) {
            setFocus(Qt::MouseFocusReason);
            XAllowEvents(x11Info().display(), ReplayPointer, CurrentTime);
            return true;
	}
	break;
    case XButtonRelease:
	if (!d->clientIsXEmbed)
            XAllowEvents(x11Info().display(), SyncPointer, CurrentTime);
	break;
    default:
	break;
    }

    return QWidget::x11Event(event);
}

/*! \internal

    Whenever the container is resized, we need to resize our client.
*/
void QX11EmbedContainer::resizeEvent(QResizeEvent *)
{
    Q_D(QX11EmbedContainer);
    if (d->client)
	XResizeWindow(x11Info().display(), d->client, width(), height());
}

/*! \internal

    We use the QShowEvent to signal to our client that we want it to
    map itself. We do this by changing its window property
    XEMBED_INFO. The client will get an X11 PropertyNotify.
*/
void QX11EmbedContainer::showEvent(QShowEvent *)
{
    Q_D(QX11EmbedContainer);
    if (d->client) {
	unsigned int data[] = {XEMBED_VERSION, XEMBED_MAPPED};
	XChangeProperty(x11Info().display(), d->client, _XEMBED_INFO, _XEMBED_INFO, 32,
			PropModeReplace, (unsigned char *) data, 2);
    }
}

/*! \internal

    We use the QHideEvent to signal to our client that we want it to
    unmap itself. We do this by changing its window property
    XEMBED_INFO. The client will get an X11 PropertyNotify.
*/
void QX11EmbedContainer::hideEvent(QHideEvent *)
{
    Q_D(QX11EmbedContainer);
    if (d->client) {
	unsigned int data[] = {XEMBED_VERSION, XEMBED_MAPPED};

	XChangeProperty(x11Info().display(), d->client, _XEMBED_INFO, _XEMBED_INFO, 32,
			PropModeReplace, (unsigned char *) data, 2);
    }
}

/*!
    \reimp
*/
bool QX11EmbedContainer::event(QEvent *event)
{
    if (event->type() == QEvent::ParentChange) {
        XSelectInput(x11Info().display(), internalWinId(),
                     KeyPressMask | KeyReleaseMask
                     | ButtonPressMask | ButtonReleaseMask | ButtonMotionMask
                     | KeymapStateMask
                     | PointerMotionMask
                     | EnterWindowMask | LeaveWindowMask
                     | FocusChangeMask
                     | ExposureMask
                     | StructureNotifyMask
                     | SubstructureNotifyMask);
    }
    return QWidget::event(event);
}

/*! \internal

    Rejects a client window by reparenting it to the root window.  The
    client will receive a reparentnotify, and will most likely assume
    that the container has shut down. The XEmbed protocol does not
    define any way to reject a client window, but this is a clean way
    to do it.
*/
void QX11EmbedContainerPrivate::rejectClient(WId window)
{
    Q_Q(QX11EmbedContainer);
    q->setEnabled(false);
    XRemoveFromSaveSet(q->x11Info().display(), client);
    XReparentWindow(q->x11Info().display(), window, q->x11Info().appRootWindow(), 0, 0);
}

/*! \internal

    Accepts a client by mapping it, resizing it and optionally
    activating and giving it logical focusing through XEMBED messages.
*/
void QX11EmbedContainerPrivate::acceptClient(WId window)
{
    Q_Q(QX11EmbedContainer);
    client = window;
    q->setEnabled(true);

    // This tells Qt that we wish to forward DnD messages to
    // our client.
    if (!extra)
        createExtra();
    extraData()->xDndProxy = client;

    unsigned int version = XEmbedVersion();

    Atom actual_type_return;
    int actual_format_return;
    unsigned long nitems_return = 0;
    unsigned long bytes_after_return;
    unsigned char *prop_return = 0;
    unsigned int clientversion = 0;

    // Add this client to our saveset, so if we crash, the client window
    // doesn't get destroyed. This is useful for containers that restart
    // automatically after a crash, because it can simply reembed its clients
    // without having to restart them (KDE panel).
    XAddToSaveSet(q->x11Info().display(), client);

    // XEmbed clients have an _XEMBED_INFO property in which we can
    // fetch the version
    if (XGetWindowProperty(q->x11Info().display(), client, _XEMBED_INFO, 0, 2, false, _XEMBED_INFO,
			   &actual_type_return, &actual_format_return, &nitems_return,
			   &bytes_after_return, &prop_return) == Success) {

	if (actual_type_return != None && actual_format_return != 0) {
	    // Clients with the _XEMBED_INFO property are XEMBED clients.
	    clientIsXEmbed = true;

	    unsigned int *p = (unsigned int *)prop_return;
	    if (nitems_return >= 2)
		clientversion = p[0];
	}

	XFree(prop_return);
    }

    // Store client window's original size and placement.
    Window root;
    int x_return, y_return;
    unsigned int width_return, height_return, border_width_return, depth_return;
    XGetGeometry(q->x11Info().display(), client, &root, &x_return, &y_return,
		 &width_return, &height_return, &border_width_return, &depth_return);
    clientOriginalRect.setCoords(x_return, y_return,
				 x_return + width_return - 1,
				 y_return + height_return - 1);

    // Ask the client for its minimum size.
    XSizeHints size;
    long msize;
    if (XGetWMNormalHints(q->x11Info().display(), client, &size, &msize) && (size.flags & PMinSize)) {
	wmMinimumSizeHint = QSize(size.min_width, size.min_height);
        q->updateGeometry();
    }

    // The container should set the data2 field to the lowest of its
    // supported version number and that of the client (from
    // _XEMBED_INFO property).
    unsigned int minversion = version > clientversion ? clientversion : version;
    sendXEmbedMessage(client, q->x11Info().display(), XEMBED_EMBEDDED_NOTIFY, q->internalWinId(), minversion);
    XMapWindow(q->x11Info().display(), client);

    // Resize it, but no smaller than its minimum size hint.
    XResizeWindow(q->x11Info().display(),
                  client,
                  qMax(q->width(), wmMinimumSizeHint.width()),
                  qMax(q->height(), wmMinimumSizeHint.height()));
    q->update();

    // Not mentioned in the protocol is that if the container
    // is already active, the client must be activated to work
    // properly.
    if (q->window()->isActiveWindow())
	sendXEmbedMessage(client, q->x11Info().display(), XEMBED_WINDOW_ACTIVATE);

    // Also, if the container already has focus, then it must
    // send a focus in message to its new client; otherwise we ask
    // it to remove focus.
    if (q->focusWidget() == q && q->hasFocus())
	sendXEmbedMessage(client, q->x11Info().display(), XEMBED_FOCUS_IN, XEMBED_FOCUS_FIRST);
    else
	sendXEmbedMessage(client, q->x11Info().display(), XEMBED_FOCUS_OUT);

    if (!clientIsXEmbed) {
        checkGrab();
        if (q->hasFocus()) {
            XSetInputFocus(q->x11Info().display(), client, XRevertToParent, x11Time());
        } else {
            if (!isEmbedded())
                moveInputToProxy();
        }
    }

    emit q->clientIsEmbedded();
}

/*! \internal

    Moves X11 keyboard input focus to the focusProxy, unless the focus
    is there already. When X11 keyboard input focus is on the
    focusProxy, which is a child of the container and a sibling of the
    client, X11 keypresses and keyreleases will always go to the proxy
    and not to the client.
*/
void QX11EmbedContainerPrivate::moveInputToProxy()
{
    Q_Q(QX11EmbedContainer);
    WId focus;
    int revert_to;
    XGetInputFocus(q->x11Info().display(), &focus, &revert_to);
    if (focus != focusProxy->internalWinId())
	XSetInputFocus(q->x11Info().display(), focusProxy->internalWinId(), XRevertToParent, x11Time());
}

/*! \internal

    Ask the window manager to give us a default minimum size.
*/
QSize QX11EmbedContainer::minimumSizeHint() const
{
    Q_D(const QX11EmbedContainer);
    if (!d->client || !d->wmMinimumSizeHint.isValid())
	return QWidget::minimumSizeHint();
    return d->wmMinimumSizeHint;
}

/*! \internal

*/
void QX11EmbedContainerPrivate::checkGrab()
{
    Q_Q(QX11EmbedContainer);
    if (!clientIsXEmbed && q->isActiveWindow() && !q->hasFocus()) {
        if (!xgrab) {
            XGrabButton(q->x11Info().display(), AnyButton, AnyModifier, q->internalWinId(),
                        true, ButtonPressMask, GrabModeSync, GrabModeAsync,
                        None, None);
        }
        xgrab = true;
    } else {
	if (xgrab)
	    XUngrabButton(q->x11Info().display(), AnyButton, AnyModifier, q->internalWinId());
        xgrab = false;
    }
}

/*!
    Detaches the client from the embedder. The client will appear as a
    standalone window on the desktop.
*/
void QX11EmbedContainer::discardClient()
{
    Q_D(QX11EmbedContainer);
    if (d->client) {
	XResizeWindow(x11Info().display(), d->client, d->clientOriginalRect.width(),
		      d->clientOriginalRect.height());

	d->rejectClient(d->client);
    }
}