qt-everywhere-src-5.15.1/qtbase/src/widgets/kernel/qwindowcontainer.cpp - orbit - Git at Google

 /****************************************************************************
 **
 ** Copyright (C) 2016 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the QtWidgets module of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:LGPL$
 ** Commercial License Usage
 ** Licensees holding valid commercial Qt licenses may use this file in
 ** accordance with the commercial license agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
 ** a written agreement between you and The Qt Company. For licensing terms
 ** and conditions see https://www.qt.io/terms-conditions. For further
 ** information use the contact form at https://www.qt.io/contact-us.
 **
 ** GNU Lesser General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU Lesser
 ** General Public License version 3 as published by the Free Software
 ** Foundation and appearing in the file LICENSE.LGPL3 included in the
 ** packaging of this file. Please review the following information to
 ** ensure the GNU Lesser General Public License version 3 requirements
 ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
 **
 ** GNU General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU
 ** General Public License version 2.0 or (at your option) the GNU General
 ** Public license version 3 or any later version approved by the KDE Free
 ** Qt Foundation. The licenses are as published by the Free Software
 ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
 ** included in the packaging of this file. Please review the following
 ** information to ensure the GNU General Public License requirements will
 ** be met: https://www.gnu.org/licenses/gpl-2.0.html and
 ** https://www.gnu.org/licenses/gpl-3.0.html.
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include "qwindowcontainer_p.h"
 #include "qwidget_p.h"
 #include <QtGui/qwindow.h>
 #include <QtGui/private/qguiapplication_p.h>
 #include <qpa/qplatformintegration.h>
 #include <QDebug>

 #if QT_CONFIG(mdiarea)
 #include <QMdiSubWindow>
 #endif
 #include <QAbstractScrollArea>
 #include <QPainter>

 QT_BEGIN_NAMESPACE

 class QWindowContainerPrivate : public QWidgetPrivate
 {
 public:
     Q_DECLARE_PUBLIC(QWindowContainer)

     QWindowContainerPrivate()
         : window(nullptr)
         , oldFocusWindow(nullptr)
         , usesNativeWidgets(false)
     {
     }

     ~QWindowContainerPrivate() { }

     static QWindowContainerPrivate *get(QWidget *w) {
         QWindowContainer *wc = qobject_cast<QWindowContainer *>(w);
         if (wc)
             return wc->d_func();
         return nullptr;
     }

     void updateGeometry() {
         Q_Q(QWindowContainer);
         if (!q->isWindow() && (q->geometry().bottom() <= 0 || q->geometry().right() <= 0))
             /* Qt (e.g. QSplitter) sometimes prefer to hide a widget by *not* calling
                setVisible(false). This is often done by setting its coordinates to a sufficiently
                negative value so that its clipped outside the parent. Since a QWindow is not clipped
                to widgets in general, it needs to be dealt with as a special case.
             */
             window->setGeometry(q->geometry());
         else if (usesNativeWidgets)
             window->setGeometry(q->rect());
         else
             window->setGeometry(QRect(q->mapTo(q->window(), QPoint()), q->size()));
     }

     void updateUsesNativeWidgets()
     {
         if (window->parent() == nullptr)
             return;
         Q_Q(QWindowContainer);
         if (q->internalWinId()) {
             // Allow use native widgets if the window container is already a native widget
             usesNativeWidgets = true;
             return;
         }
         bool nativeWidgetSet = false;
         QWidget *p = q->parentWidget();
         while (p) {
             if (false
 #if QT_CONFIG(mdiarea)
                 || qobject_cast<QMdiSubWindow *>(p) != 0
 #endif
 #if QT_CONFIG(scrollarea)
                 || qobject_cast<QAbstractScrollArea *>(p) != 0
 #endif
                     ) {
                 q->winId();
                 nativeWidgetSet = true;
                 break;
             }
             p = p->parentWidget();
         }
         usesNativeWidgets = nativeWidgetSet;
     }

     void markParentChain() {
         Q_Q(QWindowContainer);
         QWidget *p = q;
         while (p) {
             QWidgetPrivate *d = static_cast<QWidgetPrivate *>(QWidgetPrivate::get(p));
             d->createExtra();
             d->extra->hasWindowContainer = true;
             p = p->parentWidget();
         }
     }

     bool isStillAnOrphan() const {
         return window->parent() == &fakeParent;
     }

     QPointer<QWindow> window;
     QWindow *oldFocusWindow;
     QWindow fakeParent;

     uint usesNativeWidgets : 1;
 };


 /*!
     \fn QWidget *QWidget::createWindowContainer(QWindow *window, QWidget *parent, Qt::WindowFlags flags);

     Creates a QWidget that makes it possible to embed \a window into
     a QWidget-based application.

     The window container is created as a child of \a parent and with
     window flags \a flags.

     Once the window has been embedded into the container, the
     container will control the window's geometry and
     visibility. Explicit calls to QWindow::setGeometry(),
     QWindow::show() or QWindow::hide() on an embedded window is not
     recommended.

     The container takes over ownership of \a window. The window can
     be removed from the window container with a call to
     QWindow::setParent().

     The window container is attached as a native child window to the
     toplevel window it is a child of. When a window container is used
     as a child of a QAbstractScrollArea or QMdiArea, it will
     create a \l {Native Widgets vs Alien Widgets} {native window} for
     every widget in its parent chain to allow for proper stacking and
     clipping in this use case. Creating a native window for the window
     container also allows for proper stacking and clipping. This must
     be done before showing the window container. Applications with
     many native child windows may suffer from performance issues.

     The window container has a number of known limitations:

     \list

     \li Stacking order; The embedded window will stack on top of the
     widget hierarchy as an opaque box. The stacking order of multiple
     overlapping window container instances is undefined.

     \li Rendering Integration; The window container does not interoperate
     with QGraphicsProxyWidget, QWidget::render() or similar functionality.

     \li Focus Handling; It is possible to let the window container
     instance have any focus policy and it will delegate focus to the
     window via a call to QWindow::requestActivate(). However,
     returning to the normal focus chain from the QWindow instance will
     be up to the QWindow instance implementation itself. For instance,
     when entering a Qt Quick based window with tab focus, it is quite
     likely that further tab presses will only cycle inside the QML
     application. Also, whether QWindow::requestActivate() actually
     gives the window focus, is platform dependent.

     \li Using many window container instances in a QWidget-based
     application can greatly hurt the overall performance of the
     application.

     \endlist
  */

 QWidget *QWidget::createWindowContainer(QWindow *window, QWidget *parent, Qt::WindowFlags flags)
 {
     return new QWindowContainer(window, parent, flags);
 }


 /*!
     \internal
  */

 QWindowContainer::QWindowContainer(QWindow *embeddedWindow, QWidget *parent, Qt::WindowFlags flags)
     : QWidget(*new QWindowContainerPrivate, parent, flags)
 {
     Q_D(QWindowContainer);
     if (Q_UNLIKELY(!embeddedWindow)) {
         qWarning("QWindowContainer: embedded window cannot be null");
         return;
     }

     // The embedded QWindow must use the same logic as QWidget when it comes to the surface type.
     // Otherwise we may end up with BadMatch failures on X11.
     if (embeddedWindow->surfaceType() == QSurface::RasterSurface
         && QGuiApplicationPrivate::platformIntegration()->hasCapability(QPlatformIntegration::RasterGLSurface)
         && !QCoreApplication::testAttribute(Qt::AA_ForceRasterWidgets))
         embeddedWindow->setSurfaceType(QSurface::RasterGLSurface);

     d->window = embeddedWindow;

     QString windowName = d->window->objectName();
     if (windowName.isEmpty())
         windowName = QString::fromUtf8(d->window->metaObject()->className());
     d->fakeParent.setObjectName(windowName + QLatin1String("ContainerFakeParent"));

     d->window->setParent(&d->fakeParent);
     setAcceptDrops(true);

     connect(QGuiApplication::instance(), SIGNAL(focusWindowChanged(QWindow*)), this, SLOT(focusWindowChanged(QWindow*)));
 }

 QWindow *QWindowContainer::containedWindow() const
 {
     Q_D(const QWindowContainer);
     return d->window;
 }

 /*!
     \internal
  */

 QWindowContainer::~QWindowContainer()
 {
     Q_D(QWindowContainer);

     // Call destroy() explicitly first. The dtor would do this too, but
     // QEvent::PlatformSurface delivery relies on virtuals. Getting
     // SurfaceAboutToBeDestroyed can be essential for OpenGL, Vulkan, etc.
     // QWindow subclasses in particular. Keep these working.
     if (d->window)
         d->window->destroy();

     delete d->window;
 }


 /*!
     \internal
  */

 void QWindowContainer::focusWindowChanged(QWindow *focusWindow)
 {
     Q_D(QWindowContainer);
     d->oldFocusWindow = focusWindow;
     if (focusWindow == d->window) {
         QWidget *widget = QApplication::focusWidget();
         if (widget)
             widget->clearFocus();
     }
 }

 /*!
     \internal
  */

 bool QWindowContainer::event(QEvent *e)
 {
     Q_D(QWindowContainer);
     if (!d->window)
         return QWidget::event(e);

     QEvent::Type type = e->type();
     switch (type) {
     case QEvent::ChildRemoved: {
         QChildEvent *ce = static_cast<QChildEvent *>(e);
         if (ce->child() == d->window)
             d->window = nullptr;
         break;
     }
     // The only thing we are interested in is making sure our sizes stay
     // in sync, so do a catch-all case.
     case QEvent::Resize:
         d->updateGeometry();
         break;
     case QEvent::Move:
         d->updateGeometry();
         break;
     case QEvent::PolishRequest:
         d->updateGeometry();
         break;
     case QEvent::Show:
         d->updateUsesNativeWidgets();
         if (d->isStillAnOrphan()) {
             d->window->setParent(d->usesNativeWidgets
                                  ? windowHandle()
                                  : window()->windowHandle());
             d->fakeParent.destroy();
         }
         if (d->window->parent()) {
             d->markParentChain();
             d->window->show();
         }
         break;
     case QEvent::Hide:
         if (d->window->parent())
             d->window->hide();
         break;
     case QEvent::FocusIn:
         if (d->window->parent()) {
             if (d->oldFocusWindow != d->window) {
                 d->window->requestActivate();
             } else {
                 QWidget *next = nextInFocusChain();
                 next->setFocus();
             }
         }
         break;
 #if QT_CONFIG(draganddrop)
     case QEvent::Drop:
     case QEvent::DragMove:
     case QEvent::DragLeave:
         QCoreApplication::sendEvent(d->window, e);
         return e->isAccepted();
     case QEvent::DragEnter:
         // Don't reject drag events for the entire widget when one
         // item rejects the drag enter
         QCoreApplication::sendEvent(d->window, e);
         e->accept();
         return true;
 #endif

     case QEvent::Paint:
     {
         static bool needsPunch = !QGuiApplicationPrivate::platformIntegration()->hasCapability(
             QPlatformIntegration::TopStackedNativeChildWindows);
         if (needsPunch) {
             QPainter p(this);
             p.setCompositionMode(QPainter::CompositionMode_Source);
             p.fillRect(rect(), Qt::transparent);
         }
         break;
     }

     default:
         break;
     }

     return QWidget::event(e);
 }

 typedef void (*qwindowcontainer_traverse_callback)(QWidget *parent);
 static void qwindowcontainer_traverse(QWidget *parent, qwindowcontainer_traverse_callback callback)
 {
     const QObjectList &children = parent->children();
     for (int i=0; i<children.size(); ++i) {
         QWidget *w = qobject_cast<QWidget *>(children.at(i));
         if (w) {
             QWidgetPrivate *wd = static_cast<QWidgetPrivate *>(QWidgetPrivate::get(w));
             if (wd->extra && wd->extra->hasWindowContainer)
                 callback(w);
         }
     }
 }

 void QWindowContainer::toplevelAboutToBeDestroyed(QWidget *parent)
 {
     if (QWindowContainerPrivate *d = QWindowContainerPrivate::get(parent)) {
         d->window->setParent(&d->fakeParent);
     }
     qwindowcontainer_traverse(parent, toplevelAboutToBeDestroyed);
 }

 void QWindowContainer::parentWasChanged(QWidget *parent)
 {
     if (QWindowContainerPrivate *d = QWindowContainerPrivate::get(parent)) {
         if (d->window->parent()) {
             d->updateUsesNativeWidgets();
             d->markParentChain();
             QWidget *toplevel = d->usesNativeWidgets ? parent : parent->window();
             if (!toplevel->windowHandle()) {
                 QWidgetPrivate *tld = static_cast<QWidgetPrivate *>(QWidgetPrivate::get(toplevel));
                 tld->createTLExtra();
                 tld->createTLSysExtra();
                 Q_ASSERT(toplevel->windowHandle());
             }
             d->window->setParent(toplevel->windowHandle());
             d->fakeParent.destroy();
             d->updateGeometry();
         }
     }
     qwindowcontainer_traverse(parent, parentWasChanged);
 }

 void QWindowContainer::parentWasMoved(QWidget *parent)
 {
     if (QWindowContainerPrivate *d = QWindowContainerPrivate::get(parent)) {
         if (d->window->parent())
             d->updateGeometry();
     }
     qwindowcontainer_traverse(parent, parentWasMoved);
 }

 void QWindowContainer::parentWasRaised(QWidget *parent)
 {
     if (QWindowContainerPrivate *d = QWindowContainerPrivate::get(parent)) {
         if (d->window->parent())
             d->window->raise();
     }
     qwindowcontainer_traverse(parent, parentWasRaised);
 }

 void QWindowContainer::parentWasLowered(QWidget *parent)
 {
     if (QWindowContainerPrivate *d = QWindowContainerPrivate::get(parent)) {
         if (d->window->parent())
             d->window->lower();
     }
     qwindowcontainer_traverse(parent, parentWasLowered);
 }

 QT_END_NAMESPACE

 #include "moc_qwindowcontainer_p.cpp"
	/****************************************************************************
	**
	** Copyright (C) 2016 The Qt Company Ltd.
	** Contact: https://www.qt.io/licensing/
	**
	** This file is part of the QtWidgets module of the Qt Toolkit.
	**
	** $QT_BEGIN_LICENSE:LGPL$
	** Commercial License Usage
	** Licensees holding valid commercial Qt licenses may use this file in
	** accordance with the commercial license agreement provided with the
	** Software or, alternatively, in accordance with the terms contained in
	** a written agreement between you and The Qt Company. For licensing terms
	** and conditions see https://www.qt.io/terms-conditions. For further
	** information use the contact form at https://www.qt.io/contact-us.
	**
	** GNU Lesser General Public License Usage
	** Alternatively, this file may be used under the terms of the GNU Lesser
	** General Public License version 3 as published by the Free Software
	** Foundation and appearing in the file LICENSE.LGPL3 included in the
	** packaging of this file. Please review the following information to
	** ensure the GNU Lesser General Public License version 3 requirements
	** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
	**
	** GNU General Public License Usage
	** Alternatively, this file may be used under the terms of the GNU
	** General Public License version 2.0 or (at your option) the GNU General
	** Public license version 3 or any later version approved by the KDE Free
	** Qt Foundation. The licenses are as published by the Free Software
	** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
	** included in the packaging of this file. Please review the following
	** information to ensure the GNU General Public License requirements will
	** be met: https://www.gnu.org/licenses/gpl-2.0.html and
	** https://www.gnu.org/licenses/gpl-3.0.html.
	**
	** $QT_END_LICENSE$
	**
	****************************************************************************/

	#include "qwindowcontainer_p.h"
	#include "qwidget_p.h"
	#include <QtGui/qwindow.h>
	#include <QtGui/private/qguiapplication_p.h>
	#include <qpa/qplatformintegration.h>
	#include <QDebug>

	#if QT_CONFIG(mdiarea)
	#include <QMdiSubWindow>
	#endif
	#include <QAbstractScrollArea>
	#include <QPainter>

	QT_BEGIN_NAMESPACE

	class QWindowContainerPrivate : public QWidgetPrivate
	{
	public:
	Q_DECLARE_PUBLIC(QWindowContainer)

	QWindowContainerPrivate()
	: window(nullptr)
	, oldFocusWindow(nullptr)
	, usesNativeWidgets(false)
	{
	}

	~QWindowContainerPrivate() { }

	static QWindowContainerPrivate get(QWidget w) {
	QWindowContainer wc = qobject_cast<QWindowContainer >(w);
	if (wc)
	return wc->d_func();
	return nullptr;
	}

	void updateGeometry() {
	Q_Q(QWindowContainer);
	if (!q->isWindow() && (q->geometry().bottom() <= 0 \|\| q->geometry().right() <= 0))
	/* Qt (e.g. QSplitter) sometimes prefer to hide a widget by not calling
	setVisible(false). This is often done by setting its coordinates to a sufficiently
	negative value so that its clipped outside the parent. Since a QWindow is not clipped
	to widgets in general, it needs to be dealt with as a special case.
	*/
	window->setGeometry(q->geometry());
	else if (usesNativeWidgets)
	window->setGeometry(q->rect());
	else
	window->setGeometry(QRect(q->mapTo(q->window(), QPoint()), q->size()));
	}

	void updateUsesNativeWidgets()
	{
	if (window->parent() == nullptr)
	return;
	Q_Q(QWindowContainer);
	if (q->internalWinId()) {
	// Allow use native widgets if the window container is already a native widget
	usesNativeWidgets = true;
	return;
	}
	bool nativeWidgetSet = false;
	QWidget *p = q->parentWidget();
	while (p) {
	if (false
	#if QT_CONFIG(mdiarea)
	\|\| qobject_cast<QMdiSubWindow *>(p) != 0
	#endif
	#if QT_CONFIG(scrollarea)
	\|\| qobject_cast<QAbstractScrollArea *>(p) != 0
	#endif
	) {
	q->winId();
	nativeWidgetSet = true;
	break;
	}
	p = p->parentWidget();
	}
	usesNativeWidgets = nativeWidgetSet;
	}

	void markParentChain() {
	Q_Q(QWindowContainer);
	QWidget *p = q;
	while (p) {
	QWidgetPrivate d = static_cast<QWidgetPrivate >(QWidgetPrivate::get(p));
	d->createExtra();
	d->extra->hasWindowContainer = true;
	p = p->parentWidget();
	}
	}

	bool isStillAnOrphan() const {
	return window->parent() == &fakeParent;
	}

	QPointer<QWindow> window;
	QWindow *oldFocusWindow;
	QWindow fakeParent;

	uint usesNativeWidgets : 1;
	};



	/*!
	\fn QWidget QWidget::createWindowContainer(QWindow window, QWidget *parent, Qt::WindowFlags flags);

	Creates a QWidget that makes it possible to embed \a window into
	a QWidget-based application.

	The window container is created as a child of \a parent and with
	window flags \a flags.

	Once the window has been embedded into the container, the
	container will control the window's geometry and
	visibility. Explicit calls to QWindow::setGeometry(),
	QWindow::show() or QWindow::hide() on an embedded window is not
	recommended.

	The container takes over ownership of \a window. The window can
	be removed from the window container with a call to
	QWindow::setParent().

	The window container is attached as a native child window to the
	toplevel window it is a child of. When a window container is used
	as a child of a QAbstractScrollArea or QMdiArea, it will
	create a \l {Native Widgets vs Alien Widgets} {native window} for
	every widget in its parent chain to allow for proper stacking and
	clipping in this use case. Creating a native window for the window
	container also allows for proper stacking and clipping. This must
	be done before showing the window container. Applications with
	many native child windows may suffer from performance issues.

	The window container has a number of known limitations:

	\list

	\li Stacking order; The embedded window will stack on top of the
	widget hierarchy as an opaque box. The stacking order of multiple
	overlapping window container instances is undefined.

	\li Rendering Integration; The window container does not interoperate
	with QGraphicsProxyWidget, QWidget::render() or similar functionality.

	\li Focus Handling; It is possible to let the window container
	instance have any focus policy and it will delegate focus to the
	window via a call to QWindow::requestActivate(). However,
	returning to the normal focus chain from the QWindow instance will
	be up to the QWindow instance implementation itself. For instance,
	when entering a Qt Quick based window with tab focus, it is quite
	likely that further tab presses will only cycle inside the QML
	application. Also, whether QWindow::requestActivate() actually
	gives the window focus, is platform dependent.

	\li Using many window container instances in a QWidget-based
	application can greatly hurt the overall performance of the
	application.

	\endlist
	*/

	QWidget QWidget::createWindowContainer(QWindow window, QWidget *parent, Qt::WindowFlags flags)
	{
	return new QWindowContainer(window, parent, flags);
	}



	/*!
	\internal
	*/

	QWindowContainer::QWindowContainer(QWindow embeddedWindow, QWidget parent, Qt::WindowFlags flags)
	: QWidget(*new QWindowContainerPrivate, parent, flags)
	{
	Q_D(QWindowContainer);
	if (Q_UNLIKELY(!embeddedWindow)) {
	qWarning("QWindowContainer: embedded window cannot be null");
	return;
	}

	// The embedded QWindow must use the same logic as QWidget when it comes to the surface type.
	// Otherwise we may end up with BadMatch failures on X11.
	if (embeddedWindow->surfaceType() == QSurface::RasterSurface
	&& QGuiApplicationPrivate::platformIntegration()->hasCapability(QPlatformIntegration::RasterGLSurface)
	&& !QCoreApplication::testAttribute(Qt::AA_ForceRasterWidgets))
	embeddedWindow->setSurfaceType(QSurface::RasterGLSurface);

	d->window = embeddedWindow;

	QString windowName = d->window->objectName();
	if (windowName.isEmpty())
	windowName = QString::fromUtf8(d->window->metaObject()->className());
	d->fakeParent.setObjectName(windowName + QLatin1String("ContainerFakeParent"));

	d->window->setParent(&d->fakeParent);
	setAcceptDrops(true);

	connect(QGuiApplication::instance(), SIGNAL(focusWindowChanged(QWindow)), this, SLOT(focusWindowChanged(QWindow)));
	}

	QWindow *QWindowContainer::containedWindow() const
	{
	Q_D(const QWindowContainer);
	return d->window;
	}

	/*!
	\internal
	*/

	QWindowContainer::~QWindowContainer()
	{
	Q_D(QWindowContainer);

	// Call destroy() explicitly first. The dtor would do this too, but
	// QEvent::PlatformSurface delivery relies on virtuals. Getting
	// SurfaceAboutToBeDestroyed can be essential for OpenGL, Vulkan, etc.
	// QWindow subclasses in particular. Keep these working.
	if (d->window)
	d->window->destroy();

	delete d->window;
	}



	/*!
	\internal
	*/

	void QWindowContainer::focusWindowChanged(QWindow *focusWindow)
	{
	Q_D(QWindowContainer);
	d->oldFocusWindow = focusWindow;
	if (focusWindow == d->window) {
	QWidget *widget = QApplication::focusWidget();
	if (widget)
	widget->clearFocus();
	}
	}

	/*!
	\internal
	*/

	bool QWindowContainer::event(QEvent *e)
	{
	Q_D(QWindowContainer);
	if (!d->window)
	return QWidget::event(e);

	QEvent::Type type = e->type();
	switch (type) {
	case QEvent::ChildRemoved: {
	QChildEvent ce = static_cast<QChildEvent >(e);
	if (ce->child() == d->window)
	d->window = nullptr;
	break;
	}
	// The only thing we are interested in is making sure our sizes stay
	// in sync, so do a catch-all case.
	case QEvent::Resize:
	d->updateGeometry();
	break;
	case QEvent::Move:
	d->updateGeometry();
	break;
	case QEvent::PolishRequest:
	d->updateGeometry();
	break;
	case QEvent::Show:
	d->updateUsesNativeWidgets();
	if (d->isStillAnOrphan()) {
	d->window->setParent(d->usesNativeWidgets
	? windowHandle()
	: window()->windowHandle());
	d->fakeParent.destroy();
	}
	if (d->window->parent()) {
	d->markParentChain();
	d->window->show();
	}
	break;
	case QEvent::Hide:
	if (d->window->parent())
	d->window->hide();
	break;
	case QEvent::FocusIn:
	if (d->window->parent()) {
	if (d->oldFocusWindow != d->window) {
	d->window->requestActivate();
	} else {
	QWidget *next = nextInFocusChain();
	next->setFocus();
	}
	}
	break;
	#if QT_CONFIG(draganddrop)
	case QEvent::Drop:
	case QEvent::DragMove:
	case QEvent::DragLeave:
	QCoreApplication::sendEvent(d->window, e);
	return e->isAccepted();
	case QEvent::DragEnter:
	// Don't reject drag events for the entire widget when one
	// item rejects the drag enter
	QCoreApplication::sendEvent(d->window, e);
	e->accept();
	return true;
	#endif

	case QEvent::Paint:
	{
	static bool needsPunch = !QGuiApplicationPrivate::platformIntegration()->hasCapability(
	QPlatformIntegration::TopStackedNativeChildWindows);
	if (needsPunch) {
	QPainter p(this);
	p.setCompositionMode(QPainter::CompositionMode_Source);
	p.fillRect(rect(), Qt::transparent);
	}
	break;
	}

	default:
	break;
	}

	return QWidget::event(e);
	}

	typedef void (qwindowcontainer_traverse_callback)(QWidget parent);
	static void qwindowcontainer_traverse(QWidget *parent, qwindowcontainer_traverse_callback callback)
	{
	const QObjectList &children = parent->children();
	for (int i=0; i<children.size(); ++i) {
	QWidget w = qobject_cast<QWidget >(children.at(i));
	if (w) {
	QWidgetPrivate wd = static_cast<QWidgetPrivate >(QWidgetPrivate::get(w));
	if (wd->extra && wd->extra->hasWindowContainer)
	callback(w);
	}
	}
	}

	void QWindowContainer::toplevelAboutToBeDestroyed(QWidget *parent)
	{
	if (QWindowContainerPrivate *d = QWindowContainerPrivate::get(parent)) {
	d->window->setParent(&d->fakeParent);
	}
	qwindowcontainer_traverse(parent, toplevelAboutToBeDestroyed);
	}

	void QWindowContainer::parentWasChanged(QWidget *parent)
	{
	if (QWindowContainerPrivate *d = QWindowContainerPrivate::get(parent)) {
	if (d->window->parent()) {
	d->updateUsesNativeWidgets();
	d->markParentChain();
	QWidget *toplevel = d->usesNativeWidgets ? parent : parent->window();
	if (!toplevel->windowHandle()) {
	QWidgetPrivate tld = static_cast<QWidgetPrivate >(QWidgetPrivate::get(toplevel));
	tld->createTLExtra();
	tld->createTLSysExtra();
	Q_ASSERT(toplevel->windowHandle());
	}
	d->window->setParent(toplevel->windowHandle());
	d->fakeParent.destroy();
	d->updateGeometry();
	}
	}
	qwindowcontainer_traverse(parent, parentWasChanged);
	}

	void QWindowContainer::parentWasMoved(QWidget *parent)
	{
	if (QWindowContainerPrivate *d = QWindowContainerPrivate::get(parent)) {
	if (d->window->parent())
	d->updateGeometry();
	}
	qwindowcontainer_traverse(parent, parentWasMoved);
	}

	void QWindowContainer::parentWasRaised(QWidget *parent)
	{
	if (QWindowContainerPrivate *d = QWindowContainerPrivate::get(parent)) {
	if (d->window->parent())
	d->window->raise();
	}
	qwindowcontainer_traverse(parent, parentWasRaised);
	}

	void QWindowContainer::parentWasLowered(QWidget *parent)
	{
	if (QWindowContainerPrivate *d = QWindowContainerPrivate::get(parent)) {
	if (d->window->parent())
	d->window->lower();
	}
	qwindowcontainer_traverse(parent, parentWasLowered);
	}

	QT_END_NAMESPACE

	#include "moc_qwindowcontainer_p.cpp"