| /**************************************************************************** |
| ** |
| ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). |
| ** All rights reserved. |
| ** Contact: Nokia Corporation (qt-info@nokia.com) |
| ** |
| ** This file is part of the Qt3Support module of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:LGPL$ |
| ** GNU Lesser General Public License Usage |
| ** 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: |
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| ** |
| ** 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. |
| ** |
| ** 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. |
| ** |
| ** Other Usage |
| ** Alternatively, this file may be used in accordance with the terms and |
| ** conditions contained in a signed written agreement between you and Nokia. |
| ** |
| ** |
| ** |
| ** |
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| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| #include "q3signal.h" |
| #include "qmetaobject.h" |
| #include "qpointer.h" |
| #include "q3cstring.h" |
| |
| QT_BEGIN_NAMESPACE |
| |
| /*! |
| \class Q3Signal |
| \brief The Q3Signal class can be used to send signals for classes |
| that don't inherit QObject. |
| |
| \compat |
| |
| If you want to send signals from a class that does not inherit |
| QObject, you can create an internal Q3Signal object to emit the |
| signal. You must also provide a function that connects the signal |
| to an outside object slot. This is how we used to implement |
| signals in Qt 3's QMenuData class, which was not a QObject. In Qt |
| 4, menus contain actions, which are QObjects. |
| |
| In general, we recommend inheriting QObject instead. QObject |
| provides much more functionality. |
| |
| You can set a single QVariant parameter for the signal with |
| setValue(). |
| |
| Note that QObject is a \e private base class of Q3Signal, i.e. you |
| cannot call any QObject member functions from a Q3Signal object. |
| |
| Example: |
| \snippet doc/src/snippets/code/src_qt3support_tools_q3signal.cpp 0 |
| */ |
| |
| /*! |
| Constructs a signal object called \a name, with the parent object |
| \a parent. These arguments are passed directly to QObject. |
| */ |
| |
| Q3Signal::Q3Signal(QObject *parent, const char *name) |
| : QObject(parent, name) |
| { |
| #ifndef QT_NO_VARIANT |
| val = 0; |
| #endif |
| } |
| |
| /*! |
| Destroys the signal. All connections are removed, as is the case |
| with all QObjects. |
| */ |
| Q3Signal::~Q3Signal() |
| { |
| } |
| #ifndef QT_NO_VARIANT |
| // Returns true if it matches ".+(.*int.*" |
| static inline bool intSignature(const char *member) |
| { |
| Q3CString s(member); |
| int p = s.find('('); |
| return p > 0 && p < s.findRev("int"); |
| } |
| #endif |
| /*! |
| Connects the signal to \a member in object \a receiver. |
| Returns true if the connection is successful. |
| |
| \sa disconnect(), QObject::connect() |
| */ |
| |
| bool Q3Signal::connect(const QObject *receiver, const char *member) |
| { |
| #ifndef QT_NO_VARIANT |
| if (intSignature(member)) |
| #endif |
| return QObject::connect((QObject *)this, SIGNAL(intSignal(int)), receiver, member); |
| #ifndef QT_NO_VARIANT |
| return QObject::connect((QObject *)this, SIGNAL(signal(QVariant)), |
| receiver, member); |
| #endif |
| } |
| |
| /*! |
| Disonnects the signal from \a member in object \a receiver. |
| Returns true if the connection existed and the disconnect |
| was successful. |
| |
| \sa connect(), QObject::disconnect() |
| */ |
| |
| bool Q3Signal::disconnect(const QObject *receiver, const char *member) |
| { |
| if (!member) |
| return QObject::disconnect((QObject *)this, 0, receiver, member); |
| #ifndef QT_NO_VARIANT |
| if (intSignature(member)) |
| #endif |
| return QObject::disconnect((QObject *)this, SIGNAL(intSignal(int)), receiver, member); |
| #ifndef QT_NO_VARIANT |
| return QObject::disconnect((QObject *)this, SIGNAL(signal(QVariant)), |
| receiver, member); |
| #endif |
| } |
| |
| |
| /*! |
| \fn bool Q3Signal::isBlocked() const |
| \obsolete |
| Returns true if the signal is blocked, or false if it is not blocked. |
| |
| The signal is not blocked by default. |
| |
| \sa block(), QObject::signalsBlocked() |
| */ |
| |
| /*! |
| \fn void Q3Signal::block(bool b) |
| \obsolete |
| Blocks the signal if \a b is true, or unblocks the signal if \a b is false. |
| |
| An activated signal disappears into hyperspace if it is blocked. |
| |
| \sa isBlocked(), activate(), QObject::blockSignals() |
| */ |
| |
| |
| /*! |
| \fn void Q3Signal::activate() |
| |
| Emits the signal. If the platform supports QVariant and a |
| parameter has been set with setValue(), this value is passed in |
| the signal. |
| */ |
| void Q3Signal::activate() |
| { |
| #ifndef QT_NO_VARIANT |
| /* Create this Q3GuardedPtr on this, if we get destroyed after the intSignal (but before the variant signal) |
| we cannot just emit the signal (because val has been destroyed already) */ |
| QPointer<Q3Signal> me = this; |
| if(me) |
| emit intSignal(val.toInt()); |
| if(me) |
| emit signal(val); |
| #else |
| emit intSignal(0); |
| #endif |
| } |
| |
| #ifndef QT_NO_VARIANT |
| /*! |
| Sets the signal's parameter to \a value |
| */ |
| void Q3Signal::setValue(const QVariant &value) |
| { |
| val = value; |
| } |
| |
| /*! |
| Returns the signal's parameter |
| */ |
| QVariant Q3Signal::value() const |
| { |
| return val; |
| } |
| /*! \fn void Q3Signal::signal(const QVariant &) |
| \internal |
| */ |
| /*! \fn void Q3Signal::intSignal(int) |
| \internal |
| */ |
| |
| /*! \obsolete */ |
| void Q3Signal::setParameter(int value) |
| { |
| val = value; |
| } |
| |
| /*! \obsolete */ |
| int Q3Signal::parameter() const |
| { |
| return val.toInt(); |
| } |
| #endif //QT_NO_VARIANT |
| |
| QT_END_NAMESPACE |