/****************************************************************************

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the QtCore 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 Technology Preview License Agreement accompanying

** this package.

**

** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

** Nokia at qt-info@nokia.com.

**

**

**

**

**

**

**

**

** $QT_END_LICENSE$

**

****************************************************************************/

#include "qsignalmapper.h"

#ifndef QT_NO_SIGNALMAPPER

#include "qhash.h"

#include "qobject_p.h"

QT_BEGIN_NAMESPACE

class QSignalMapperPrivate : public QObjectPrivate

{

    Q_DECLARE_PUBLIC(QSignalMapper)

public:

    void _q_senderDestroyed() {

        Q_Q(QSignalMapper);

        q->removeMappings(q->sender());

    }

    QHash<QObject *, int> intHash;

    QHash<QObject *, QString> stringHash;

    QHash<QObject *, QWidget*> widgetHash;

    QHash<QObject *, QObject*> objectHash;

};

/*!

    \class QSignalMapper

    \brief The QSignalMapper class bundles signals from identifiable senders.

    \ingroup objectmodel

    This class collects a set of parameterless signals, and re-emits

    them with integer, string or widget parameters corresponding to

    the object that sent the signal.

    The class supports the mapping of particular strings or integers

    with particular objects using setMapping(). The objects' signals

    can then be connected to the map() slot which will emit the

    mapped() signal with the string or integer associated with the

    original signalling object. Mappings can be removed later using

    removeMappings().

    Example: Suppose we want to create a custom widget that contains

    a group of buttons (like a tool palette). One approach is to

    connect each button's \c clicked() signal to its own custom slot;

    but in this example we want to connect all the buttons to a

    single slot and parameterize the slot by the button that was

    clicked.

    Here's the definition of a simple custom widget that has a single

    signal, \c clicked(), which is emitted with the text of the button

    that was clicked:

    \snippet doc/src/snippets/qsignalmapper/buttonwidget.h 0

    \snippet doc/src/snippets/qsignalmapper/buttonwidget.h 1

    The only function that we need to implement is the constructor:

    \snippet doc/src/snippets/qsignalmapper/buttonwidget.cpp 0

    \snippet doc/src/snippets/qsignalmapper/buttonwidget.cpp 1

    \snippet doc/src/snippets/qsignalmapper/buttonwidget.cpp 2

    A list of texts is passed to the constructor. A signal mapper is

    constructed and for each text in the list a QPushButton is

    created. We connect each button's \c clicked() signal to the

    signal mapper's map() slot, and create a mapping in the signal

    mapper from each button to the button's text. Finally we connect

    the signal mapper's mapped() signal to the custom widget's \c

    clicked() signal. When the user clicks a button, the custom

    widget will emit a single \c clicked() signal whose argument is

    the text of the button the user clicked.

    \sa QObject, QButtonGroup, QActionGroup

*/

/*!

    Constructs a QSignalMapper with parent \a parent.

*/

QSignalMapper::QSignalMapper(QObject* parent)

    : QObject(*new QSignalMapperPrivate, parent)

{

}

#ifdef QT3_SUPPORT

/*!

    \overload QSignalMapper()

    \obsolete

 */

QSignalMapper::QSignalMapper(QObject *parent, const char *name)

    : QObject(*new QSignalMapperPrivate, parent)

{

    setObjectName(QString::fromAscii(name));

}

#endif

/*!

    Destroys the QSignalMapper.

*/

QSignalMapper::~QSignalMapper()

{

}

/*!

    Adds a mapping so that when map() is signalled from the given \a

    sender, the signal mapped(\a id) is emitted.

    There may be at most one integer ID for each sender.

    \sa mapping()

*/

void QSignalMapper::setMapping(QObject *sender, int id)

{

    Q_D(QSignalMapper);

    d->intHash.insert(sender, id);

    connect(sender, SIGNAL(destroyed()), this, SLOT(_q_senderDestroyed()));

}

/*!

    Adds a mapping so that when map() is signalled from the \a sender,

    the signal mapped(\a text ) is emitted.

    There may be at most one text for each sender.

*/

void QSignalMapper::setMapping(QObject *sender, const QString &text)

{

    Q_D(QSignalMapper);

    d->stringHash.insert(sender, text);

    connect(sender, SIGNAL(destroyed()), this, SLOT(_q_senderDestroyed()));

}

/*!

    Adds a mapping so that when map() is signalled from the \a sender,

    the signal mapped(\a widget ) is emitted.

    There may be at most one widget for each sender.

*/

void QSignalMapper::setMapping(QObject *sender, QWidget *widget)

{

    Q_D(QSignalMapper);

    d->widgetHash.insert(sender, widget);

    connect(sender, SIGNAL(destroyed()), this, SLOT(_q_senderDestroyed()));

}

/*!

    Adds a mapping so that when map() is signalled from the \a sender,

    the signal mapped(\a object ) is emitted.

    There may be at most one object for each sender.

*/

void QSignalMapper::setMapping(QObject *sender, QObject *object)

{

    Q_D(QSignalMapper);

    d->objectHash.insert(sender, object);

    connect(sender, SIGNAL(destroyed()), this, SLOT(_q_senderDestroyed()));

}

/*!

    Returns the sender QObject that is associated with the \a id.

    \sa setMapping()

*/

QObject *QSignalMapper::mapping(int id) const

{

    Q_D(const QSignalMapper);

    return d->intHash.key(id);

}

/*!

    \overload mapping()

*/

QObject *QSignalMapper::mapping(const QString &id) const

{

    Q_D(const QSignalMapper);

    return d->stringHash.key(id);

}

/*!

    \overload mapping()

    Returns the sender QObject that is associated with the \a widget.

*/

QObject *QSignalMapper::mapping(QWidget *widget) const

{

    Q_D(const QSignalMapper);

    return d->widgetHash.key(widget);

}

/*!

    \overload mapping()

    Returns the sender QObject that is associated with the \a object.

*/

QObject *QSignalMapper::mapping(QObject *object) const

{

    Q_D(const QSignalMapper);

    return d->objectHash.key(object);

}

/*!

    Removes all mappings for \a sender.

    This is done automatically when mapped objects are destroyed.

*/

void QSignalMapper::removeMappings(QObject *sender)

{

    Q_D(QSignalMapper);

    d->intHash.remove(sender);

    d->stringHash.remove(sender);

    d->widgetHash.remove(sender);

    d->objectHash.remove(sender);

}

/*!

    This slot emits signals based on which object sends signals to it.

*/

void QSignalMapper::map() { map(sender()); }

/*!

    This slot emits signals based on the \a sender object.

*/

void QSignalMapper::map(QObject *sender)

{

    Q_D(QSignalMapper);

    if (d->intHash.contains(sender))

        emit mapped(d->intHash.value(sender));

    if (d->stringHash.contains(sender))

        emit mapped(d->stringHash.value(sender));

    if (d->widgetHash.contains(sender))

        emit mapped(d->widgetHash.value(sender));

    if (d->objectHash.contains(sender))

        emit mapped(d->objectHash.value(sender));

}

/*!

    \fn void QSignalMapper::mapped(int i)

    This signal is emitted when map() is signalled from an object that

    has an integer mapping set. The object's mapped integer is passed

    in \a i.

    \sa setMapping()

*/

/*!

    \fn void QSignalMapper::mapped(const QString &text)

    This signal is emitted when map() is signalled from an object that

    has a string mapping set. The object's mapped string is passed in

    \a text.

    \sa setMapping()

*/

/*!

    \fn void QSignalMapper::mapped(QWidget *widget)

    This signal is emitted when map() is signalled from an object that

    has a widget mapping set. The object's mapped widget is passed in

    \a widget.

    \sa setMapping()

*/

/*!

    \fn void QSignalMapper::mapped(QObject *object)

    This signal is emitted when map() is signalled from an object that

    has an object mapping set. The object provided by the map is passed in

    \a object.

    \sa setMapping()

*/

QT_END_NAMESPACE

#include "moc_qsignalmapper.cpp"

#endif // QT_NO_SIGNALMAPPER