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258 lines
6.4 KiB
258 lines
6.4 KiB
/****************************************************************************
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**
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** Implementation of QSignal class
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**
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** Created : 941201
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**
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** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
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**
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** This file is part of the kernel module of the Qt GUI Toolkit.
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**
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** This file may be used under the terms of the GNU General
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** Public License versions 2.0 or 3.0 as published by the Free
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** Software Foundation and appearing in the files LICENSE.GPL2
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** and LICENSE.GPL3 included in the packaging of this file.
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** Alternatively you may (at your option) use any later version
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** of the GNU General Public License if such license has been
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** publicly approved by Trolltech ASA (or its successors, if any)
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** and the KDE Free Qt Foundation.
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**
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** Please review the following information to ensure GNU General
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** Public Licensing requirements will be met:
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** http://trolltech.com/products/qt/licenses/licensing/opensource/.
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** If you are unsure which license is appropriate for your use, please
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** review the following information:
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** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
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** or contact the sales department at sales@trolltech.com.
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**
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** This file may be used under the terms of the Q Public License as
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** defined by Trolltech ASA and appearing in the file LICENSE.QPL
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** included in the packaging of this file. Licensees holding valid Qt
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** Commercial licenses may use this file in accordance with the Qt
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** Commercial License Agreement provided with the Software.
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**
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** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
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** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
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** herein.
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**
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**********************************************************************/
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#include "qsignal.h"
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#include "qmetaobject.h"
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#include "qguardedptr.h"
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/*!
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\class QSignal qsignal.h
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\brief The QSignal class can be used to send signals for classes
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that don't inherit QObject.
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\ingroup io
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\ingroup misc
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If you want to send signals from a class that does not inherit
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QObject, you can create an internal QSignal object to emit the
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signal. You must also provide a function that connects the signal
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to an outside object slot. This is how we have implemented
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signals in the QMenuData class, which is not a QObject.
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In general, we recommend inheriting QObject instead. QObject
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provides much more functionality.
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You can set a single QVariant parameter for the signal with
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setValue().
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Note that QObject is a \e private base class of QSignal, i.e. you
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cannot call any QObject member functions from a QSignal object.
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Example:
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\code
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#include <qsignal.h>
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class MyClass
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{
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public:
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MyClass();
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~MyClass();
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void doSomething();
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void connect( QObject *receiver, const char *member );
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private:
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QSignal *sig;
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};
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MyClass::MyClass()
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{
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sig = new QSignal;
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}
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MyClass::~MyClass()
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{
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delete sig;
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}
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void MyClass::doSomething()
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{
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// ... does something
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sig->activate(); // emits the signal
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}
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void MyClass::connect( QObject *receiver, const char *member )
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{
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sig->connect( receiver, member );
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}
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\endcode
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*/
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/*!
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Constructs a signal object called \a name, with the parent object
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\a parent. These arguments are passed directly to QObject.
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*/
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QSignal::QSignal( QObject *parent, const char *name )
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: QObject( parent, name )
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{
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isSignal = TRUE;
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#ifndef QT_NO_VARIANT
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val = 0;
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#endif
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}
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/*!
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Destroys the signal. All connections are removed, as is the case
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with all QObjects.
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*/
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QSignal::~QSignal()
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{
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}
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#ifndef QT_NO_VARIANT
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// Returns TRUE if it matches ".+(.*int.*"
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static inline bool intSignature( const char *member )
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{
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QCString s( member );
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int p = s.find( '(' );
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return p > 0 && p < s.findRev( "int" );
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}
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#endif
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/*!
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Connects the signal to \a member in object \a receiver.
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\sa disconnect(), QObject::connect()
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*/
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bool QSignal::connect( const QObject *receiver, const char *member )
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{
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#ifndef QT_NO_VARIANT
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if ( intSignature( member ) )
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#endif
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return QObject::connect( (QObject *)this, SIGNAL(intSignal(int)), receiver, member );
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#ifndef QT_NO_VARIANT
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return QObject::connect( (QObject *)this, SIGNAL(signal(const QVariant&)),
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receiver, member );
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#endif
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}
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/*!
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Disonnects the signal from \a member in object \a receiver.
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\sa connect(), QObject::disconnect()
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*/
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bool QSignal::disconnect( const QObject *receiver, const char *member )
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{
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if (!member)
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return QObject::disconnect( (QObject *)this, 0, receiver, member);
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#ifndef QT_NO_VARIANT
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if ( intSignature( member ) )
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#endif
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return QObject::disconnect( (QObject *)this, SIGNAL(intSignal(int)), receiver, member );
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#ifndef QT_NO_VARIANT
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return QObject::disconnect( (QObject *)this, SIGNAL(signal(const QVariant&)),
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receiver, member );
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#endif
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}
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/*!
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\fn bool QSignal::isBlocked() const
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\obsolete
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Returns TRUE if the signal is blocked, or FALSE if it is not blocked.
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The signal is not blocked by default.
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\sa block(), QObject::signalsBlocked()
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*/
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/*!
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\fn void QSignal::block( bool b )
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\obsolete
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Blocks the signal if \a b is TRUE, or unblocks the signal if \a b is FALSE.
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An activated signal disappears into hyperspace if it is blocked.
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\sa isBlocked(), activate(), QObject::blockSignals()
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*/
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/*!
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\fn void QSignal::activate()
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Emits the signal. If the platform supports QVariant and a
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parameter has been set with setValue(), this value is passed in
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the signal.
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*/
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void QSignal::activate()
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{
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#ifndef QT_NO_VARIANT
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/* Create this QGuardedPtr on this, if we get destroyed after the intSignal (but before the variant signal)
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we cannot just emit the signal (because val has been destroyed already) */
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QGuardedPtr<QSignal> me = this;
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if( me )
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emit intSignal( val.toInt() );
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if( me )
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emit signal( val );
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#else
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emit intSignal(0);
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#endif
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}
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#ifndef QT_NO_VARIANT
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/*!
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Sets the signal's parameter to \a value
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*/
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void QSignal::setValue( const QVariant &value )
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{
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val = value;
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}
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/*!
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Returns the signal's parameter
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*/
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QVariant QSignal::value() const
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{
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return val;
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}
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/*! \fn void QSignal::signal( const QVariant & )
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\internal
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*/
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/*! \fn void QSignal::intSignal( int )
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\internal
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*/
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#ifndef QT_NO_COMPAT
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/*! \obsolete */
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void QSignal::setParameter( int value )
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{
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val = value;
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}
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/*! \obsolete */
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int QSignal::parameter() const
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{
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return val.toInt();
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}
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#endif
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#endif //QT_NO_VARIANT
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