Long live Qt 4.5!

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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the Qt3Support module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "q3hbox.h"
+#include "qlayout.h"
+#include "qapplication.h"
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \class Q3HBox
+    \brief The Q3HBox widget provides horizontal geometry management
+    for its child widgets.
+
+    \compat
+
+    All the horizontal box's child widgets will be placed alongside
+    each other and sized according to their sizeHint()s.
+
+    Use setMargin() to add space around the edges, and use
+    setSpacing() to add space between the widgets. Use
+    setStretchFactor() if you want the widgets to be different sizes
+    in proportion to one another. (See \link layout.html
+    Layouts\endlink for more information on stretch factors.)
+
+    \img qhbox-m.png Q3HBox
+
+    \sa QHBoxLayout Q3VBox Q3Grid
+*/
+
+
+/*!
+    Constructs an hbox widget with parent \a parent, called \a name.
+    The parent, name and widget flags, \a f, are passed to the Q3Frame
+    constructor.
+*/
+Q3HBox::Q3HBox(QWidget *parent, const char *name, Qt::WindowFlags f)
+    :Q3Frame(parent, name, f)
+{
+    (new QHBoxLayout(this, frameWidth(), frameWidth(), name))->setAutoAdd(true);
+}
+
+
+/*!
+    Constructs a horizontal hbox if \a horizontal is TRUE, otherwise
+    constructs a vertical hbox (also known as a vbox).
+
+    This constructor is provided for the QVBox class. You should never
+    need to use it directly.
+
+    The \a parent, \a name and widget flags, \a f, are passed to the
+    Q3Frame constructor.
+*/
+
+Q3HBox::Q3HBox(bool horizontal, QWidget *parent , const char *name, Qt::WindowFlags f)
+    :Q3Frame(parent, name, f)
+{
+    (new QBoxLayout(this, horizontal ? QBoxLayout::LeftToRight : QBoxLayout::Down,
+                     frameWidth(), frameWidth(), name))->setAutoAdd(true);
+}
+
+/*!\reimp
+ */
+void Q3HBox::frameChanged()
+{
+    if (layout())
+        layout()->setMargin(frameWidth());
+}
+
+
+/*!
+    Sets the spacing between the child widgets to \a space.
+*/
+
+void Q3HBox::setSpacing(int space)
+{
+    if (layout())
+        layout()->setSpacing(space);
+}
+
+
+/*!
+  \reimp
+*/
+
+QSize Q3HBox::sizeHint() const
+{
+    QWidget *mThis = (QWidget*)this;
+    QApplication::sendPostedEvents(mThis, QEvent::ChildInserted);
+    return Q3Frame::sizeHint();
+}
+
+/*!
+    Sets the stretch factor of widget \a w to \a stretch. Returns true if
+    \a w is found. Otherwise returns false.
+
+    \sa QBoxLayout::setStretchFactor() \link layout.html Layouts\endlink
+*/
+bool Q3HBox::setStretchFactor(QWidget* w, int stretch)
+{
+    QApplication::sendPostedEvents(this, QEvent::ChildInserted);
+    if (QBoxLayout *lay = qobject_cast<QBoxLayout *>(layout()))
+        return lay->setStretchFactor(w, stretch);
+    return false;
+}
+
+QT_END_NAMESPACE