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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 "q3whatsthis.h"
+#ifndef QT_NO_WHATSTHIS
+#include "qapplication.h"
+#include "qwidget.h"
+#include "qevent.h"
+
+QT_BEGIN_NAMESPACE
+
+/*! \class Q3WhatsThis
+    \compat
+*/
+
+/*!
+    Constructs a new "What's This?" object for \a widget.
+*/
+Q3WhatsThis::Q3WhatsThis(QWidget *widget)
+    : QObject(widget)
+{
+    if (widget)
+        widget->installEventFilter(this);
+}
+
+/*!
+    Destroys the "What's This?" object.
+*/
+Q3WhatsThis::~Q3WhatsThis()
+{
+}
+
+/*!
+    \internal
+
+    Handles "What's This?" events.
+*/
+bool Q3WhatsThis::eventFilter(QObject *o, QEvent *e)
+{
+    if (o != parent() || !o->isWidgetType())
+        return false;
+
+    if (e->type() == QEvent::WhatsThis) {
+        QString s = text(static_cast<QHelpEvent*>(e)->pos());
+        if (!s.isEmpty())
+            QWhatsThis::showText(static_cast<QHelpEvent*>(e)->globalPos(), s, static_cast<QWidget*>(o));
+    } else if (e->type() == QEvent::QueryWhatsThis) {
+        QString s = text(static_cast<QHelpEvent*>(e)->pos());
+        if (s.isEmpty())
+            return false;
+    } else if (e->type() == QEvent::WhatsThisClicked) {
+        QString href = static_cast<QWhatsThisClickedEvent*>(e)->href();
+        if (clicked(href))
+            QWhatsThis::hideText();
+    } else {
+        return false;
+    }
+    return true;
+}
+
+/*!
+    This virtual function returns the text for position \a pos in the
+    widget that this "What's This?" object documents. If there is no
+    "What's This?" text for the position, an empty string is returned.
+
+    The default implementation returns an empty string.
+*/
+QString Q3WhatsThis::text(const QPoint & /* pos */)
+{
+    if (parent() && parent()->isWidgetType())
+        return static_cast<QWidget*>(parent())->whatsThis();
+    return QString();
+}
+
+/*!
+    This virtual function is called when the user clicks inside the
+    "What's this?" window. \a href is the link the user clicked on, or
+    an empty string if there was no link.
+
+    If the function returns true (the default), the "What's this?"
+    window is closed, otherwise it remains visible.
+
+    The default implementation ignores \a href and returns true.
+*/
+bool Q3WhatsThis::clicked(const QString & /* href */)
+{
+    return true;
+}
+
+/*!
+    \fn void Q3WhatsThis::enterWhatsThisMode()
+
+    Enters "What's This?" mode and returns immediately.
+
+    Qt will install a special cursor and take over mouse input until
+    the user clicks somewhere. It then shows any help available and
+    ends "What's This?" mode. Finally, Qt removes the special cursor
+    and help window and then restores ordinary event processing, at
+    which point the left mouse button is no longer pressed.
+
+    The user can also use the Esc key to leave "What's This?" mode.
+
+    \sa inWhatsThisMode(), leaveWhatsThisMode()
+*/
+
+/*!
+    \fn bool Q3WhatsThis::inWhatsThisMode()
+
+    Returns true if the application is in "What's This?" mode;
+    otherwise returns false.
+
+    \sa enterWhatsThisMode(), leaveWhatsThisMode()
+*/
+
+/*!
+    \fn void Q3WhatsThis::add(QWidget *widget, const QString &text)
+
+    Adds \a text as "What's This?" help for \a widget. If the text is
+    rich text formatted (i.e. it contains markup) it will be rendered
+    with the default stylesheet QStyleSheet::defaultSheet().
+
+    The text is destroyed if the widget is later destroyed, so it need
+    not be explicitly removed.
+
+    \sa remove()
+*/
+
+/*!
+    \fn void Q3WhatsThis::remove(QWidget *widget)
+
+    Removes the "What's This?" help associated with the \a widget.
+    This happens automatically if the widget is destroyed.
+
+    \sa add()
+*/
+
+/*!
+    \fn void Q3WhatsThis::leaveWhatsThisMode(const QString& text = QString(), const QPoint& pos = QCursor::pos(), QWidget* widget = 0)
+
+    This function is used internally by widgets that support
+    QWidget::customWhatsThis(); applications do not usually call it.
+    An example of such a widget is Q3PopupMenu: menus still work
+    normally in "What's This?" mode but also provide help texts for
+    individual menu items.
+
+    If \a text is not empty, a "What's This?" help window is
+    displayed at the global screen position \a pos. If widget \a widget is
+    not 0 and has its own dedicated QWhatsThis object, this object
+    will receive clicked() messages when the user clicks on hyperlinks
+    inside the help text.
+
+    \sa inWhatsThisMode(), enterWhatsThisMode(), clicked()
+*/
+
+/*!
+    \fn void Q3WhatsThis::display(const QString &text, const QPoint &pos, QWidget *widget)
+
+    Display \a text in a help window at the global screen position \a
+    pos.
+
+    If widget \a widget is not 0 and has its own dedicated QWhatsThis
+    object, this object will receive clicked() messages when the user
+    clicks on hyperlinks inside the help text.
+
+    \sa clicked()
+*/
+
+/*!
+    Creates a QToolButton preconfigured to enter "What's This?" mode
+    when clicked. You will often use this with a tool bar as \a
+    parent:
+
+    \snippet doc/src/snippets/code/src_qt3support_widgets_q3whatsthis.cpp 0
+*/
+QToolButton *Q3WhatsThis::whatsThisButton(QWidget * parent)
+{
+    return QWhatsThis::whatsThisButton(parent);
+}
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_WHATSTHIS