/**************************************************************************** ** $Id$ ** ** Implementation of QObject class ** ** Created : 930418 ** ** Copyright (C) 1992-2002 Trolltech AS. All rights reserved. ** ** This file is part of the kernel module of the Qt GUI Toolkit. ** ** This file may be distributed under the terms of the Q Public License ** as defined by Trolltech AS of Norway and appearing in the file ** LICENSE.QPL included in the packaging of this file. ** ** This file may be distributed and/or modified under the terms of the ** GNU General Public License version 2 as published by the Free Software ** Foundation and appearing in the file LICENSE.GPL included in the ** packaging of this file. ** ** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition ** licenses may use this file in accordance with the Qt Commercial License ** Agreement provided with the Software. ** ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. ** ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for ** information about Qt Commercial License Agreements. ** See http://www.trolltech.com/qpl/ for QPL licensing information. ** See http://www.trolltech.com/gpl/ for GPL licensing information. ** ** Contact info@trolltech.com if any conditions of this licensing are ** not clear to you. ** **********************************************************************/ #include "qvariant.h" #include "qapplication.h" #include "qobject.h" #include "qobjectlist.h" #include "qsignalslotimp.h" #include "qregexp.h" #include "qmetaobject.h" #include #include "qucomextra_p.h" #include "qptrvector.h" #ifdef QT_THREAD_SUPPORT #include #include #endif #include #ifndef QT_NO_USERDATA class QObjectPrivate : public QPtrVector { public: QObjectPrivate( uint s ) : QPtrVector(s){ setAutoDelete( TRUE ); } }; #else class QObjectPrivate { } #endif class QSenderObjectList : public QObjectList, public QShared { public: QSenderObjectList() : currentSender( 0 ) { } QObject *currentSender; }; /*! \class Qt qnamespace.h \brief The Qt class is a namespace for miscellaneous identifiers that need to be global-like. \ingroup misc Normally, you can ignore this class. QObject and a few other classes inherit it, so all the identifiers in the Qt namespace are normally usable without qualification. However, you may occasionally need to say \c Qt::black instead of just \c black, particularly in static utility functions (such as many class factories). */ /*! \enum Qt::Orientation This type is used to signify an object's orientation. \value Horizontal \value Vertical Orientation is used with QScrollBar for example. */ /*! \class QObject qobject.h \brief The QObject class is the base class of all Qt objects. \ingroup objectmodel \mainclass \reentrant QObject is the heart of the \link object.html Qt object model. \endlink The central feature in this model is a very powerful mechanism for seamless object communication called \link signalsandslots.html signals and slots \endlink. You can connect a signal to a slot with connect() and destroy the connection with disconnect(). To avoid never ending notification loops you can temporarily block signals with blockSignals(). The protected functions connectNotify() and disconnectNotify() make it possible to track connections. QObjects organize themselves in object trees. When you create a QObject with another object as parent, the object will automatically do an insertChild() on the parent and thus show up in the parent's children() list. The parent takes ownership of the object i.e. it will automatically delete its children in its destructor. You can look for an object by name and optionally type using child() or queryList(), and get the list of tree roots using objectTrees(). Every object has an object name() and can report its className() and whether it inherits() another class in the QObject inheritance hierarchy. When an object is deleted, it emits a destroyed() signal. You can catch this signal to avoid dangling references to QObjects. The QGuardedPtr class provides an elegant way to use this feature. QObjects can receive events through event() and filter the events of other objects. See installEventFilter() and eventFilter() for details. A convenience handler, childEvent(), can be reimplemented to catch child events. Last but not least, QObject provides the basic timer support in Qt; see QTimer for high-level support for timers. Notice that the Q_OBJECT macro is mandatory for any object that implements signals, slots or properties. You also need to run the \link moc.html moc program (Meta Object Compiler) \endlink on the source file. We strongly recommend the use of this macro in \e all subclasses of QObject regardless of whether or not they actually use signals, slots and properties, since failure to do so may lead certain functions to exhibit undefined behaviour. All Qt widgets inherit QObject. The convenience function isWidgetType() returns whether an object is actually a widget. It is much faster than inherits( "QWidget" ). Some QObject functions, e.g. children(), objectTrees() and queryList() return a QObjectList. A QObjectList is a QPtrList of QObjects. QObjectLists support the same operations as QPtrLists and have an iterator class, QObjectListIt. */ // // Remove white space from SIGNAL and SLOT names. // Internal for QObject::connect() and QObject::disconnect() // static inline bool isIdentChar( char x ) { // Avoid bug in isalnum return x == '_' || (x >= '0' && x <= '9') || (x >= 'a' && x <= 'z') || (x >= 'A' && x <= 'Z'); } static inline bool isSpace( char x ) { #if defined(Q_CC_BOR) /* Borland C++ 4.5 has a weird isspace() bug. isspace() usually works, but not here. This implementation is sufficient for our internal use: rmWS() */ return (uchar) x <= 32; #else return isspace( (uchar) x ); #endif } static QCString qt_rmWS( const char *s ) { QCString result( qstrlen(s)+1 ); char *d = result.data(); char last = 0; while( *s && isSpace(*s) ) // skip leading space s++; while ( *s ) { while ( *s && !isSpace(*s) ) last = *d++ = *s++; while ( *s && isSpace(*s) ) s++; if ( *s && isIdentChar(*s) && isIdentChar(last) ) last = *d++ = ' '; } *d = '\0'; result.truncate( (int)(d - result.data()) ); int void_pos = result.find("(void)"); if ( void_pos >= 0 ) result.remove( void_pos+1, (uint)strlen("void") ); return result; } // Event functions, implemented in qapplication_xxx.cpp int qStartTimer( int interval, QObject *obj ); bool qKillTimer( int id ); bool qKillTimer( QObject *obj ); static void removeObjFromList( QObjectList *objList, const QObject *obj, bool single=FALSE ) { if ( !objList ) return; int index = objList->findRef( obj ); while ( index >= 0 ) { objList->remove(); if ( single ) return; index = objList->findNextRef( obj ); } } /*! \relates QObject Returns a pointer to the object named \a name that inherits \a type and with a given \a parent. Returns 0 if there is no such child. \code QListBox *c = (QListBox *) qt_find_obj_child( myWidget, "QListBox", "my list box" ); if ( c ) c->insertItem( "another string" ); \endcode */ void *qt_find_obj_child( QObject *parent, const char *type, const char *name ) { const QObjectList *list = parent->children(); if ( list ) { QObjectListIt it( *list ); QObject *obj; while ( (obj = it.current()) ) { ++it; if ( qstrcmp(name,obj->name()) == 0 && obj->inherits(type) ) return obj; } } return 0; } #ifndef QT_NO_PRELIMINARY_SIGNAL_SPY /* Preliminary signal spy */ Q_EXPORT QObject* qt_preliminary_signal_spy = 0; static QObject* qt_spy_signal_sender = 0; static void qt_spy_signal( QObject* sender, int signal, QUObject* o ) { QMetaObject* mo = sender->metaObject(); while ( mo && signal - mo->signalOffset() < 0 ) mo = mo->superClass(); if ( !mo ) return; const QMetaData* sigData = mo->signal( signal - mo->signalOffset() ); if ( !sigData ) return; QCString s; mo = sender->metaObject(); while ( mo ) { s.sprintf( "%s_%s", mo->className(), sigData->name ); int slot = qt_preliminary_signal_spy->metaObject()->findSlot( s, TRUE ); if ( slot >= 0 ) { #ifdef QT_THREAD_SUPPORT // protect access to qt_spy_signal_sender void * const address = &qt_spy_signal_sender; QMutexLocker locker( qt_global_mutexpool ? qt_global_mutexpool->get( address ) : 0 ); #endif // QT_THREAD_SUPPORT QObject* old_sender = qt_spy_signal_sender; qt_spy_signal_sender = sender; qt_preliminary_signal_spy->qt_invoke( slot, o ); qt_spy_signal_sender = old_sender; break; } mo = mo->superClass(); } } /* End Preliminary signal spy */ #endif // QT_NO_PRELIMINARY_SIGNAL_SPY static QObjectList* object_trees = 0; #ifdef QT_THREAD_SUPPORT static QMutex *obj_trees_mutex = 0; #endif static void cleanup_object_trees() { delete object_trees; object_trees = 0; #ifdef QT_THREAD_SUPPORT delete obj_trees_mutex; obj_trees_mutex = 0; #endif } static void ensure_object_trees() { object_trees = new QObjectList; qAddPostRoutine( cleanup_object_trees ); } static void insert_tree( QObject* obj ) { #ifdef QT_THREAD_SUPPORT if ( !obj_trees_mutex ) obj_trees_mutex = new QMutex(); QMutexLocker locker( obj_trees_mutex ); #endif if ( !object_trees ) ensure_object_trees(); object_trees->insert(0, obj ); } static void remove_tree( QObject* obj ) { if ( object_trees ) { #ifdef QT_THREAD_SUPPORT QMutexLocker locker( obj_trees_mutex ); #endif object_trees->removeRef( obj ); } } /***************************************************************************** QObject member functions *****************************************************************************/ /*! Constructs an object called \a name with parent object, \a parent. The parent of an object may be viewed as the object's owner. For instance, a \link QDialog dialog box\endlink is the parent of the "OK" and "Cancel" buttons it contains. The destructor of a parent object destroys all child objects. Setting \a parent to 0 constructs an object with no parent. If the object is a widget, it will become a top-level window. The object name is some text that can be used to identify a QObject. It's particularly useful in conjunction with \link designer-manual.book Qt Designer\endlink. You can find an object by name (and type) using child(). To find several objects use queryList(). \sa parent(), name(), child(), queryList() */ QObject::QObject( QObject *parent, const char *name ) : isSignal( FALSE ), // assume not a signal object isWidget( FALSE ), // assume not a widget object pendTimer( FALSE ), // no timers yet blockSig( FALSE ), // not blocking signals wasDeleted( FALSE ), // double-delete catcher isTree( FALSE ), // no tree yet objname( name ? qstrdup(name) : 0 ), // set object name parentObj( 0 ), // no parent yet. It is set by insertChild() childObjects( 0 ), // no children yet connections( 0 ), // no connections yet senderObjects( 0 ), // no signals connected yet eventFilters( 0 ), // no filters installed postedEvents( 0 ), // no events posted d( 0 ) { if ( !metaObj ) // will create object dict (void) staticMetaObject(); if ( parent ) { // add object to parent parent->insertChild( this ); } else { insert_tree( this ); isTree = TRUE; } } /*! Destroys the object, deleting all its child objects. All signals to and from the object are automatically disconnected. \warning All child objects are deleted. If any of these objects are on the stack or global, sooner or later your program will crash. We do not recommend holding pointers to child objects from outside the parent. If you still do, the QObject::destroyed() signal gives you an opportunity to detect when an object is destroyed. \warning Deleting a QObject while pending events are waiting to be delivered can cause a crash. You must not delete the QObject directly from a thread that is not the GUI thread. Use the QObject::deleteLater() method instead, which will cause the event loop to delete the object after all pending events have been delivered to the object. */ QObject::~QObject() { if ( wasDeleted ) { #if defined(QT_DEBUG) qWarning( "Double QObject deletion detected." ); #endif return; } wasDeleted = 1; blockSig = 0; // unblock signals to keep QGuardedPtr happy emit destroyed( this ); emit destroyed(); if ( objname ) delete [] (char*)objname; objname = 0; if ( pendTimer ) // might be pending timers qKillTimer( this ); QApplication::removePostedEvents( this ); if ( isTree ) { remove_tree( this ); // remove from global root list isTree = FALSE; } if ( parentObj ) // remove it from parent object parentObj->removeChild( this ); register QObject *obj; if ( senderObjects ) { // disconnect from senders QSenderObjectList *tmp = senderObjects; senderObjects = 0; obj = tmp->first(); while ( obj ) { // for all senders... obj->disconnect( this ); obj = tmp->next(); } if ( tmp->deref() ) delete tmp; } if ( connections ) { // disconnect receivers for ( int i = 0; i < (int) connections->size(); i++ ) { QConnectionList* clist = (*connections)[i]; // for each signal... if ( !clist ) continue; register QConnection *c; QConnectionListIt cit(*clist); while( (c=cit.current()) ) { // for each connected slot... ++cit; if ( (obj=c->object()) ) removeObjFromList( obj->senderObjects, this ); } } delete connections; connections = 0; } if ( eventFilters ) { delete eventFilters; eventFilters = 0; } if ( childObjects ) { // delete children objects QObjectListIt it(*childObjects); while ( (obj=it.current()) ) { ++it; obj->parentObj = 0; childObjects->removeRef( obj ); delete obj; } delete childObjects; } delete d; } /*! \fn QMetaObject *QObject::metaObject() const Returns a pointer to the meta object of this object. A meta object contains information about a class that inherits QObject, e.g. class name, superclass name, properties, signals and slots. Every class that contains the Q_OBJECT macro will also have a meta object. The meta object information is required by the signal/slot connection mechanism and the property system. The functions isA() and inherits() also make use of the meta object. */ /*! \fn const char *QObject::className() const Returns the class name of this object. This function is generated by the \link metaobjects.html Meta Object Compiler. \endlink \warning This function will return the wrong name if the class definition lacks the Q_OBJECT macro. \sa name(), inherits(), isA(), isWidgetType() */ /*! Returns TRUE if this object is an instance of the class \a clname; otherwise returns FALSE. Example: \code QTimer *t = new QTimer; // QTimer inherits QObject t->isA( "QTimer" ); // returns TRUE t->isA( "QObject" ); // returns FALSE \endcode \sa inherits() metaObject() */ bool QObject::isA( const char *clname ) const { return qstrcmp( clname, className() ) == 0; } /*! Returns TRUE if this object is an instance of a class that inherits \a clname, and \a clname inherits QObject; otherwise returns FALSE. A class is considered to inherit itself. Example: \code QTimer *t = new QTimer; // QTimer inherits QObject t->inherits( "QTimer" ); // returns TRUE t->inherits( "QObject" ); // returns TRUE t->inherits( "QButton" ); // returns FALSE // QScrollBar inherits QWidget and QRangeControl QScrollBar *s = new QScrollBar( 0 ); s->inherits( "QWidget" ); // returns TRUE s->inherits( "QRangeControl" ); // returns FALSE \endcode (\l QRangeControl is not a QObject.) \sa isA(), metaObject() */ bool QObject::inherits( const char *clname ) const { return metaObject()->inherits( clname ); } /*! \internal Returns TRUE if \a object inherits \a superClass within the meta object inheritance chain; otherwise returns FALSE. \sa inherits() */ void *qt_inheritedBy( QMetaObject *superClass, const QObject *object ) { if (!object) return 0; register QMetaObject *mo = object->metaObject(); while (mo) { if (mo == superClass) return (void*)object; mo = mo->superClass(); } return 0; } /*! \property QObject::name \brief the name of this object You can find an object by name (and type) using child(). You can find a set of objects with queryList(). The object name is set by the constructor or by the setName() function. The object name is not very useful in the current version of Qt, but will become increasingly important in the future. If the object does not have a name, the name() function returns "unnamed", so printf() (used in qDebug()) will not be asked to output a null pointer. If you want a null pointer to be returned for unnamed objects, you can call name( 0 ). \code qDebug( "MyClass::setPrecision(): (%s) invalid precision %f", name(), newPrecision ); \endcode \sa className(), child(), queryList() */ const char * QObject::name() const { // If you change the name here, the builder will be broken return objname ? objname : "unnamed"; } /*! Sets the object's name to \a name. */ void QObject::setName( const char *name ) { if ( objname ) delete [] (char*) objname; objname = name ? qstrdup(name) : 0; } /*! \overload Returns the name of this object, or \a defaultName if the object does not have a name. */ const char * QObject::name( const char * defaultName ) const { return objname ? objname : defaultName; } /*! Searches the children and optionally grandchildren of this object, and returns a child that is called \a objName that inherits \a inheritsClass. If \a inheritsClass is 0 (the default), any class matches. If \a recursiveSearch is TRUE (the default), child() performs a depth-first search of the object's children. If there is no such object, this function returns 0. If there are more than one, the first one found is retured; if you need all of them, use queryList(). */ QObject* QObject::child( const char *objName, const char *inheritsClass, bool recursiveSearch ) { const QObjectList *list = children(); if ( !list ) return 0; bool onlyWidgets = ( inheritsClass && qstrcmp( inheritsClass, "QWidget" ) == 0 ); QObjectListIt it( *list ); QObject *obj; while ( ( obj = it.current() ) ) { ++it; if ( onlyWidgets ) { if ( obj->isWidgetType() && ( !objName || qstrcmp( objName, obj->name() ) == 0 ) ) break; } else if ( ( !inheritsClass || obj->inherits(inheritsClass) ) && ( !objName || qstrcmp( objName, obj->name() ) == 0 ) ) break; if ( recursiveSearch && (obj = obj->child( objName, inheritsClass, recursiveSearch ) ) ) break; } return obj; } /*! \fn bool QObject::isWidgetType() const Returns TRUE if the object is a widget; otherwise returns FALSE. Calling this function is equivalent to calling inherits("QWidget"), except that it is much faster. */ /*! \fn bool QObject::highPriority() const Returns TRUE if the object is a high-priority object, or FALSE if it is a standard-priority object. High-priority objects are placed first in QObject's list of children on the assumption that they will be referenced very often. */ /*! This virtual function receives events to an object and should return TRUE if the event \a e was recognized and processed. The event() function can be reimplemented to customize the behavior of an object. \sa installEventFilter(), timerEvent(), QApplication::sendEvent(), QApplication::postEvent(), QWidget::event() */ bool QObject::event( QEvent *e ) { #if defined(QT_CHECK_NULL) if ( e == 0 ) qWarning( "QObject::event: Null events are not permitted" ); #endif if ( eventFilters ) { // try filters if ( activate_filters(e) ) // stopped by a filter return TRUE; } switch ( e->type() ) { case QEvent::Timer: timerEvent( (QTimerEvent*)e ); return TRUE; case QEvent::ChildInserted: case QEvent::ChildRemoved: childEvent( (QChildEvent*)e ); return TRUE; case QEvent::DeferredDelete: delete this; return TRUE; default: if ( e->type() >= QEvent::User ) { customEvent( (QCustomEvent*) e ); return TRUE; } break; } return FALSE; } /*! This event handler can be reimplemented in a subclass to receive timer events for the object. QTimer provides a higher-level interface to the timer functionality, and also more general information about timers. \sa startTimer(), killTimer(), killTimers(), event() */ void QObject::timerEvent( QTimerEvent * ) { } /*! This event handler can be reimplemented in a subclass to receive child events. Child events are sent to objects when children are inserted or removed. Note that events with QEvent::type() \c QEvent::ChildInserted are posted (with \l{QApplication::postEvent()}) to make sure that the child's construction is completed before this function is called. If a child is removed immediately after it is inserted, the \c ChildInserted event may be suppressed, but the \c ChildRemoved event will always be sent. In such cases it is possible that there will be a \c ChildRemoved event without a corresponding \c ChildInserted event. If you change state based on \c ChildInserted events, call QWidget::constPolish(), or do \code QApplication::sendPostedEvents( this, QEvent::ChildInserted ); \endcode in functions that depend on the state. One notable example is QWidget::sizeHint(). \sa event(), QChildEvent */ void QObject::childEvent( QChildEvent * ) { } /*! This event handler can be reimplemented in a subclass to receive custom events. Custom events are user-defined events with a type value at least as large as the "User" item of the \l QEvent::Type enum, and is typically a QCustomEvent or QCustomEvent subclass. \sa event(), QCustomEvent */ void QObject::customEvent( QCustomEvent * ) { } /*! Filters events if this object has been installed as an event filter for the \a watched object. In your reimplementation of this function, if you want to filter the event \a e, out, i.e. stop it being handled further, return TRUE; otherwise return FALSE. Example: \code class MyMainWindow : public QMainWindow { public: MyMainWindow( QWidget *parent = 0, const char *name = 0 ); protected: bool eventFilter( QObject *obj, QEvent *ev ); private: QTextEdit *textEdit; }; MyMainWindow::MyMainWindow( QWidget *parent, const char *name ) : QMainWindow( parent, name ) { textEdit = new QTextEdit( this ); setCentralWidget( textEdit ); textEdit->installEventFilter( this ); } bool MyMainWindow::eventFilter( QObject *obj, QEvent *ev ) { if ( obj == textEdit ) { if ( e->type() == QEvent::KeyPress ) { qDebug( "Ate key press %d", k->key() ); return TRUE; } else { return FALSE; } } else { // pass the event on to the parent class return QMainWindow::eventFilter( obj, ev ); } } \endcode Notice in the example above that unhandled events are passed to the base class's eventFilter() function, since the base class might have reimplemented eventFilter() for its own internal purposes. \warning If you delete the receiver object in this function, be sure to return TRUE. Otherwise, Qt will forward the event to the deleted object and the program might crash. \sa installEventFilter() */ bool QObject::eventFilter( QObject * /* watched */, QEvent * /* e */ ) { return FALSE; } /*! \internal Activates all event filters for this object. This function is normally called from QObject::event() or QWidget::event(). */ bool QObject::activate_filters( QEvent *e ) { if ( !eventFilters ) // no event filter return FALSE; QObjectListIt it( *eventFilters ); register QObject *obj = it.current(); while ( obj ) { // send to all filters ++it; // until one returns TRUE if ( obj->eventFilter(this,e) ) { return TRUE; } obj = it.current(); } return FALSE; // don't do anything with it } /*! \fn bool QObject::signalsBlocked() const Returns TRUE if signals are blocked; otherwise returns FALSE. Signals are not blocked by default. \sa blockSignals() */ /*! Blocks signals if \a block is TRUE, or unblocks signals if \a block is FALSE. Emitted signals disappear into hyperspace if signals are blocked. Note that the destroyed() signals will be emitted even if the signals for this object have been blocked. */ void QObject::blockSignals( bool block ) { blockSig = block; } // // The timer flag hasTimer is set when startTimer is called. // It is not reset when killing the timer because more than // one timer might be active. // /*! Starts a timer and returns a timer identifier, or returns zero if it could not start a timer. A timer event will occur every \a interval milliseconds until killTimer() or killTimers() is called. If \a interval is 0, then the timer event occurs once every time there are no more window system events to process. The virtual timerEvent() function is called with the QTimerEvent event parameter class when a timer event occurs. Reimplement this function to get timer events. If multiple timers are running, the QTimerEvent::timerId() can be used to find out which timer was activated. Example: \code class MyObject : public QObject { Q_OBJECT public: MyObject( QObject *parent = 0, const char *name = 0 ); protected: void timerEvent( QTimerEvent * ); }; MyObject::MyObject( QObject *parent, const char *name ) : QObject( parent, name ) { startTimer( 50 ); // 50-millisecond timer startTimer( 1000 ); // 1-second timer startTimer( 60000 ); // 1-minute timer } void MyObject::timerEvent( QTimerEvent *e ) { qDebug( "timer event, id %d", e->timerId() ); } \endcode There is practically no upper limit for the interval value (more than one year is possible). Note that QTimer's accuracy depends on the underlying operating system and hardware. Most platforms support an accuracy of 20ms; some provide more. If Qt is unable to deliver the requested number of timer clicks, it will silently discard some. The QTimer class provides a high-level programming interface with one-shot timers and timer signals instead of events. \sa timerEvent(), killTimer(), killTimers() */ int QObject::startTimer( int interval ) { pendTimer = TRUE; // set timer flag return qStartTimer( interval, (QObject *)this ); } /*! Kills the timer with timer identifier, \a id. The timer identifier is returned by startTimer() when a timer event is started. \sa timerEvent(), startTimer(), killTimers() */ void QObject::killTimer( int id ) { qKillTimer( id ); } /*! Kills all timers that this object has started. \warning Using this function can cause hard-to-find bugs: it kills timers started by sub- and superclasses as well as those started by you, which is often not what you want. We recommend using a QTimer or perhaps killTimer(). \sa timerEvent(), startTimer(), killTimer() */ void QObject::killTimers() { qKillTimer( this ); } static void objSearch( QObjectList *result, QObjectList *list, const char *inheritsClass, bool onlyWidgets, const char *objName, QRegExp *rx, bool recurse ) { if ( !list || list->isEmpty() ) // nothing to search return; QObject *obj = list->first(); while ( obj ) { bool ok = TRUE; if ( onlyWidgets ) ok = obj->isWidgetType(); else if ( inheritsClass && !obj->inherits(inheritsClass) ) ok = FALSE; if ( ok ) { if ( objName ) ok = ( qstrcmp(objName,obj->name()) == 0 ); #ifndef QT_NO_REGEXP else if ( rx ) ok = ( rx->search(QString::fromLatin1(obj->name())) != -1 ); #endif } if ( ok ) // match! result->append( obj ); if ( recurse && obj->children() ) objSearch( result, (QObjectList *)obj->children(), inheritsClass, onlyWidgets, objName, rx, recurse ); obj = list->next(); } } /*! \fn QObject *QObject::parent() const Returns a pointer to the parent object. \sa children() */ /*! \fn const QObjectList *QObject::children() const Returns a list of child objects, or 0 if this object has no children. The QObjectList class is defined in the \c qobjectlist.h header file. The first child added is the \link QPtrList::first() first\endlink object in the list and the last child added is the \link QPtrList::last() last\endlink object in the list, i.e. new children are appended at the end. Note that the list order changes when QWidget children are \link QWidget::raise() raised\endlink or \link QWidget::lower() lowered.\endlink A widget that is raised becomes the last object in the list, and a widget that is lowered becomes the first object in the list. \sa child(), queryList(), parent(), insertChild(), removeChild() */ /*! Returns a pointer to the list of all object trees (their root objects), or 0 if there are no objects. The QObjectList class is defined in the \c qobjectlist.h header file. The most recent root object created is the \link QPtrList::first() first\endlink object in the list and the first root object added is the \link QPtrList::last() last\endlink object in the list. \sa children(), parent(), insertChild(), removeChild() */ const QObjectList *QObject::objectTrees() { return object_trees; } /*! Searches the children and optionally grandchildren of this object, and returns a list of those objects that are named or that match \a objName and inherit \a inheritsClass. If \a inheritsClass is 0 (the default), all classes match. If \a objName is 0 (the default), all object names match. If \a regexpMatch is TRUE (the default), \a objName is a regular expression that the objects's names must match. The syntax is that of a QRegExp. If \a regexpMatch is FALSE, \a objName is a string and object names must match it exactly. Note that \a inheritsClass uses single inheritance from QObject, the way inherits() does. According to inherits(), QMenuBar inherits QWidget but not QMenuData. This does not quite match reality, but is the best that can be done on the wide variety of compilers Qt supports. Finally, if \a recursiveSearch is TRUE (the default), queryList() searches \e{n}th-generation as well as first-generation children. If all this seems a bit complex for your needs, the simpler child() function may be what you want. This somewhat contrived example disables all the buttons in this window: \code QObjectList *l = topLevelWidget()->queryList( "QButton" ); QObjectListIt it( *l ); // iterate over the buttons QObject *obj; while ( (obj = it.current()) != 0 ) { // for each found object... ++it; ((QButton*)obj)->setEnabled( FALSE ); } delete l; // delete the list, not the objects \endcode The QObjectList class is defined in the \c qobjectlist.h header file. \warning Delete the list as soon you have finished using it. The list contains pointers that may become invalid at almost any time without notice (as soon as the user closes a window you may have dangling pointers, for example). \sa child() children(), parent(), inherits(), name(), QRegExp */ QObjectList *QObject::queryList( const char *inheritsClass, const char *objName, bool regexpMatch, bool recursiveSearch ) const { QObjectList *list = new QObjectList; Q_CHECK_PTR( list ); bool onlyWidgets = ( inheritsClass && qstrcmp(inheritsClass, "QWidget") == 0 ); #ifndef QT_NO_REGEXP if ( regexpMatch && objName ) { // regexp matching QRegExp rx(QString::fromLatin1(objName)); objSearch( list, (QObjectList *)children(), inheritsClass, onlyWidgets, 0, &rx, recursiveSearch ); } else #endif { objSearch( list, (QObjectList *)children(), inheritsClass, onlyWidgets, objName, 0, recursiveSearch ); } return list; } /*! \internal Returns a list of objects/slot pairs that are connected to the \a signal, or 0 if nothing is connected to it. */ QConnectionList *QObject::receivers( const char* signal ) const { if ( connections && signal ) { if ( *signal == '2' ) { // tag == 2, i.e. signal QCString s = qt_rmWS( signal+1 ); return receivers( metaObject()->findSignal( (const char*)s, TRUE ) ); } else { return receivers( metaObject()->findSignal(signal, TRUE ) ); } } return 0; } /*! \internal Returns a list of objects/slot pairs that are connected to the signal, or 0 if nothing is connected to it. */ QConnectionList *QObject::receivers( int signal ) const { #ifndef QT_NO_PRELIMINARY_SIGNAL_SPY if ( qt_preliminary_signal_spy && signal >= 0 ) { if ( !connections ) { QObject* that = (QObject*) this; that->connections = new QSignalVec( signal+1 ); that->connections->setAutoDelete( TRUE ); } if ( !connections->at( signal ) ) { QConnectionList* clist = new QConnectionList; clist->setAutoDelete( TRUE ); connections->insert( signal, clist ); return clist; } } #endif if ( connections && signal >= 0 ) return connections->at( signal ); return 0; } /*! Inserts an object \a obj into the list of child objects. \warning This function cannot be used to make one widget the child widget of another widget. Child widgets can only be created by setting the parent widget in the constructor or by calling QWidget::reparent(). \sa removeChild(), QWidget::reparent() */ void QObject::insertChild( QObject *obj ) { if ( obj->isTree ) { remove_tree( obj ); obj->isTree = FALSE; } if ( obj->parentObj && obj->parentObj != this ) { #if defined(QT_CHECK_STATE) if ( obj->parentObj != this && obj->isWidgetType() ) qWarning( "QObject::insertChild: Cannot reparent a widget, " "use QWidget::reparent() instead" ); #endif obj->parentObj->removeChild( obj ); } if ( !childObjects ) { childObjects = new QObjectList; Q_CHECK_PTR( childObjects ); } else if ( obj->parentObj == this ) { #if defined(QT_CHECK_STATE) qWarning( "QObject::insertChild: Object %s::%s already in list", obj->className(), obj->name( "unnamed" ) ); #endif return; } obj->parentObj = this; childObjects->append( obj ); QChildEvent *e = new QChildEvent( QEvent::ChildInserted, obj ); QApplication::postEvent( this, e ); } /*! Removes the child object \a obj from the list of children. \warning This function will not remove a child widget from the screen. It will only remove it from the parent widget's list of children. \sa insertChild(), QWidget::reparent() */ void QObject::removeChild( QObject *obj ) { if ( childObjects && childObjects->removeRef(obj) ) { obj->parentObj = 0; if ( !obj->wasDeleted ) { insert_tree( obj ); // it's a root object now obj->isTree = TRUE; } if ( childObjects->isEmpty() ) { delete childObjects; // last child removed childObjects = 0; // reset children list } // remove events must be sent, not posted!!! QChildEvent ce( QEvent::ChildRemoved, obj ); QApplication::sendEvent( this, &ce ); } } /*! \fn void QObject::installEventFilter( const QObject *filterObj ) Installs an event filter \a filterObj on this object. For example: \code monitoredObj->installEventFilter( filterObj ); \endcode An event filter is an object that receives all events that are sent to this object. The filter can either stop the event or forward it to this object. The event filter \a filterObj receives events via its eventFilter() function. The eventFilter() function must return TRUE if the event should be filtered, (i.e. stopped); otherwise it must return FALSE. If multiple event filters are installed on a single object, the filter that was installed last is activated first. Here's a \c KeyPressEater class that eats the key presses of its monitored objects: \code class KeyPressEater : public QObject { ... protected: bool eventFilter( QObject *o, QEvent *e ); }; bool KeyPressEater::eventFilter( QObject *o, QEvent *e ) { if ( e->type() == QEvent::KeyPress ) { // special processing for key press QKeyEvent *k = (QKeyEvent *)e; qDebug( "Ate key press %d", k->key() ); return TRUE; // eat event } else { // standard event processing return FALSE; } } \endcode And here's how to install it on two widgets: \code KeyPressEater *keyPressEater = new KeyPressEater( this ); QPushButton *pushButton = new QPushButton( this ); QListView *listView = new QListView( this ); pushButton->installEventFilter( keyPressEater ); listView->installEventFilter( keyPressEater ); \endcode The QAccel class, for example, uses this technique to intercept accelerator key presses. \warning If you delete the receiver object in your eventFilter() function, be sure to return TRUE. If you return FALSE, Qt sends the event to the deleted object and the program will crash. \sa removeEventFilter(), eventFilter(), event() */ void QObject::installEventFilter( const QObject *obj ) { if ( !obj ) return; if ( eventFilters ) { int c = eventFilters->findRef( obj ); if ( c >= 0 ) eventFilters->take( c ); disconnect( obj, SIGNAL(destroyed(QObject*)), this, SLOT(cleanupEventFilter(QObject*)) ); } else { eventFilters = new QObjectList; Q_CHECK_PTR( eventFilters ); } eventFilters->insert( 0, obj ); connect( obj, SIGNAL(destroyed(QObject*)), this, SLOT(cleanupEventFilter(QObject*)) ); } /*! Removes an event filter object \a obj from this object. The request is ignored if such an event filter has not been installed. All event filters for this object are automatically removed when this object is destroyed. It is always safe to remove an event filter, even during event filter activation (i.e. from the eventFilter() function). \sa installEventFilter(), eventFilter(), event() */ void QObject::removeEventFilter( const QObject *obj ) { if ( eventFilters && eventFilters->removeRef(obj) ) { if ( eventFilters->isEmpty() ) { // last event filter removed delete eventFilters; eventFilters = 0; // reset event filter list } disconnect( obj, SIGNAL(destroyed(QObject*)), this, SLOT(cleanupEventFilter(QObject*)) ); } } /***************************************************************************** Signal connection management *****************************************************************************/ #if defined(QT_CHECK_RANGE) static bool check_signal_macro( const QObject *sender, const char *signal, const char *func, const char *op ) { int sigcode = (int)(*signal) - '0'; if ( sigcode != QSIGNAL_CODE ) { if ( sigcode == QSLOT_CODE ) qWarning( "QObject::%s: Attempt to %s non-signal %s::%s", func, op, sender->className(), signal+1 ); else qWarning( "QObject::%s: Use the SIGNAL macro to %s %s::%s", func, op, sender->className(), signal ); return FALSE; } return TRUE; } static bool check_member_code( int code, const QObject *object, const char *member, const char *func ) { if ( code != QSLOT_CODE && code != QSIGNAL_CODE ) { qWarning( "QObject::%s: Use the SLOT or SIGNAL macro to " "%s %s::%s", func, func, object->className(), member ); return FALSE; } return TRUE; } static void err_member_notfound( int code, const QObject *object, const char *member, const char *func ) { const char *type = 0; switch ( code ) { case QSLOT_CODE: type = "slot"; break; case QSIGNAL_CODE: type = "signal"; break; } if ( strchr(member,')') == 0 ) // common typing mistake qWarning( "QObject::%s: Parentheses expected, %s %s::%s", func, type, object->className(), member ); else qWarning( "QObject::%s: No such %s %s::%s", func, type, object->className(), member ); } static void err_info_about_objects( const char * func, const QObject * sender, const QObject * receiver ) { const char * a = sender->name(), * b = receiver->name(); if ( a ) qWarning( "QObject::%s: (sender name: '%s')", func, a ); if ( b ) qWarning( "QObject::%s: (receiver name: '%s')", func, b ); } static void err_info_about_candidates( int code, const QMetaObject* mo, const char* member, const char *func ) { if ( strstr(member,"const char*") ) { // porting help QCString newname = member; int p; while ( (p=newname.find("const char*")) >= 0 ) { newname.replace(p, 11, "const QString&"); } const QMetaData *rm = 0; switch ( code ) { case QSLOT_CODE: rm = mo->slot( mo->findSlot( newname, TRUE ), TRUE ); break; case QSIGNAL_CODE: rm = mo->signal( mo->findSignal( newname, TRUE ), TRUE ); break; } if ( rm ) { qWarning("QObject::%s: Candidate: %s", func, newname.data()); } } } #endif // QT_CHECK_RANGE /*! Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns 0. The pointer is valid only during the execution of the slot that calls this function. The pointer returned by this function becomes invalid if the sender is destroyed, or if the slot is disconnected from the sender's signal. \warning This function violates the object-oriented principle of modularity. However, getting access to the sender might be useful when many signals are connected to a single slot. The sender is undefined if the slot is called as a normal C++ function. */ const QObject *QObject::sender() { #ifndef QT_NO_PRELIMINARY_SIGNAL_SPY if ( this == qt_preliminary_signal_spy ) { # ifdef QT_THREAD_SUPPORT // protect access to qt_spy_signal_sender void * const address = &qt_spy_signal_sender; QMutexLocker locker( qt_global_mutexpool ? qt_global_mutexpool->get( address ) : 0 ); # endif // QT_THREAD_SUPPORT return qt_spy_signal_sender; } #endif if ( senderObjects && senderObjects->currentSender && /* * currentSender may be a dangling pointer in case the object * it was pointing to was destructed from inside a slot. Thus * verify it still is contained inside the senderObjects list * which gets cleaned on both destruction and disconnect. */ senderObjects->findRef( senderObjects->currentSender ) != -1 ) return senderObjects->currentSender; return 0; } /*! \fn void QObject::connectNotify( const char *signal ) This virtual function is called when something has been connected to \a signal in this object. \warning This function violates the object-oriented principle of modularity. However, it might be useful when you need to perform expensive initialization only if something is connected to a signal. \sa connect(), disconnectNotify() */ void QObject::connectNotify( const char * ) { } /*! \fn void QObject::disconnectNotify( const char *signal ) This virtual function is called when something has been disconnected from \a signal in this object. \warning This function violates the object-oriented principle of modularity. However, it might be useful for optimizing access to expensive resources. \sa disconnect(), connectNotify() */ void QObject::disconnectNotify( const char * ) { } /*! \fn bool QObject::checkConnectArgs( const char *signal, const QObject *receiver, const char *member ) Returns TRUE if the \a signal and the \a member arguments are compatible; otherwise returns FALSE. (The \a receiver argument is currently ignored.) \warning We recommend that you use the default implementation and do not reimplement this function. \omit TRUE: "signal()", "member()" TRUE: "signal(a,b,c)", "member(a,b,c)" TRUE: "signal(a,b,c)", "member(a,b)", "member(a)" etc. FALSE: "signal(const a)", "member(a)" FALSE: "signal(a)", "member(const a)" FALSE: "signal(a)", "member(b)" FALSE: "signal(a)", "member(a,b)" \endomit */ bool QObject::checkConnectArgs( const char *signal, const QObject *, const char *member ) { const char *s1 = signal; const char *s2 = member; while ( *s1++ != '(' ) { } // scan to first '(' while ( *s2++ != '(' ) { } if ( *s2 == ')' || qstrcmp(s1,s2) == 0 ) // member has no args or return TRUE; // exact match int s1len = qstrlen(s1); int s2len = qstrlen(s2); if ( s2len < s1len && qstrncmp(s1,s2,s2len-1)==0 && s1[s2len-1]==',' ) return TRUE; // member has less args return FALSE; } /*! Normlizes the signal or slot definition \a signalSlot by removing unnecessary whitespace. */ QCString QObject::normalizeSignalSlot( const char *signalSlot ) { if ( !signalSlot ) return QCString(); return qt_rmWS( signalSlot ); } /*! \overload bool QObject::connect( const QObject *sender, const char *signal, const char *member ) const Connects \a signal from the \a sender object to this object's \a member. Equivalent to: \c{QObject::connect(sender, signal, this, member)}. \sa disconnect() */ /*! Connects \a signal from the \a sender object to \a member in object \a receiver, and returns TRUE if the connection succeeds; otherwise returns FALSE. You must use the SIGNAL() and SLOT() macros when specifying the \a signal and the \a member, for example: \code QLabel *label = new QLabel; QScrollBar *scroll = new QScrollBar; QObject::connect( scroll, SIGNAL(valueChanged(int)), label, SLOT(setNum(int)) ); \endcode This example ensures that the label always displays the current scroll bar value. Note that the signal and slots parameters must not contain any variable names, only the type. E.g. the following would not work and return FALSE: QObject::connect( scroll, SIGNAL(valueChanged(int v)), label, SLOT(setNum(int v)) ); A signal can also be connected to another signal: \code class MyWidget : public QWidget { Q_OBJECT public: MyWidget(); signals: void myUsefulSignal(); private: QPushButton *aButton; }; MyWidget::MyWidget() { aButton = new QPushButton( this ); connect( aButton, SIGNAL(clicked()), SIGNAL(myUsefulSignal()) ); } \endcode In this example, the MyWidget constructor relays a signal from a private member variable, and makes it available under a name that relates to MyWidget. A signal can be connected to many slots and signals. Many signals can be connected to one slot. If a signal is connected to several slots, the slots are activated in an arbitrary order when the signal is emitted. The function returns TRUE if it successfully connects the signal to the slot. It will return FALSE if it cannot create the connection, for example, if QObject is unable to verify the existence of either \a signal or \a member, or if their signatures aren't compatible. A signal is emitted for \e{every} connection you make, so if you duplicate a connection, two signals will be emitted. You can always break a connection using \c{disconnect()}. \sa disconnect() */ bool QObject::connect( const QObject *sender, const char *signal, const QObject *receiver, const char *member ) { #if defined(QT_CHECK_NULL) if ( sender == 0 || receiver == 0 || signal == 0 || member == 0 ) { qWarning( "QObject::connect: Cannot connect %s::%s to %s::%s", sender ? sender->className() : "(null)", signal ? signal+1 : "(null)", receiver ? receiver->className() : "(null)", member ? member+1 : "(null)" ); return FALSE; } #endif QMetaObject *smeta = sender->metaObject(); #if defined(QT_CHECK_RANGE) if ( !check_signal_macro( sender, signal, "connect", "bind" ) ) return FALSE; #endif QCString nw_signal(signal); // Assume already normalized ++signal; // skip member type code int signal_index = smeta->findSignal( signal, TRUE ); if ( signal_index < 0 ) { // normalize and retry nw_signal = qt_rmWS( signal-1 ); // remove whitespace signal = nw_signal.data()+1; // skip member type code signal_index = smeta->findSignal( signal, TRUE ); } if ( signal_index < 0 ) { // no such signal #if defined(QT_CHECK_RANGE) err_member_notfound( QSIGNAL_CODE, sender, signal, "connect" ); err_info_about_candidates( QSIGNAL_CODE, smeta, signal, "connect" ); err_info_about_objects( "connect", sender, receiver ); #endif return FALSE; } const QMetaData *sm = smeta->signal( signal_index, TRUE ); signal = sm->name; // use name from meta object int membcode = member[0] - '0'; // get member code QObject *s = (QObject *)sender; // we need to change them QObject *r = (QObject *)receiver; // internally #if defined(QT_CHECK_RANGE) if ( !check_member_code( membcode, r, member, "connect" ) ) return FALSE; #endif member++; // skip code QCString nw_member ; QMetaObject *rmeta = r->metaObject(); int member_index = -1; switch ( membcode ) { // get receiver member case QSLOT_CODE: member_index = rmeta->findSlot( member, TRUE ); if ( member_index < 0 ) { // normalize and retry nw_member = qt_rmWS(member); // remove whitespace member = nw_member; member_index = rmeta->findSlot( member, TRUE ); } break; case QSIGNAL_CODE: member_index = rmeta->findSignal( member, TRUE ); if ( member_index < 0 ) { // normalize and retry nw_member = qt_rmWS(member); // remove whitespace member = nw_member; member_index = rmeta->findSignal( member, TRUE ); } break; } if ( member_index < 0 ) { #if defined(QT_CHECK_RANGE) err_member_notfound( membcode, r, member, "connect" ); err_info_about_candidates( membcode, rmeta, member, "connect" ); err_info_about_objects( "connect", sender, receiver ); #endif return FALSE; } #if defined(QT_CHECK_RANGE) if ( !s->checkConnectArgs(signal,receiver,member) ) { qWarning( "QObject::connect: Incompatible sender/receiver arguments" "\n\t%s::%s --> %s::%s", s->className(), signal, r->className(), member ); return FALSE; } else { const QMetaData *rm = membcode == QSLOT_CODE ? rmeta->slot( member_index, TRUE ) : rmeta->signal( member_index, TRUE ); if ( rm ) { int si = 0; int ri = 0; while ( si < sm->method->count && ri < rm->method->count ) { if ( sm->method->parameters[si].inOut == QUParameter::Out ) si++; else if ( rm->method->parameters[ri].inOut == QUParameter::Out ) ri++; else if ( !QUType::isEqual( sm->method->parameters[si++].type, rm->method->parameters[ri++].type ) ) { if ( ( QUType::isEqual( sm->method->parameters[si-1].type, &static_QUType_ptr ) && QUType::isEqual( rm->method->parameters[ri-1].type, &static_QUType_varptr ) ) || ( QUType::isEqual( sm->method->parameters[si-1].type, &static_QUType_varptr ) && QUType::isEqual( rm->method->parameters[ri-1].type, &static_QUType_ptr ) ) ) continue; // varptr got introduced in 3.1 and is binary compatible with ptr qWarning( "QObject::connect: Incompatible sender/receiver marshalling" "\n\t%s::%s --> %s::%s", s->className(), signal, r->className(), member ); return FALSE; } } } } #endif connectInternal( sender, signal_index, receiver, membcode, member_index ); s->connectNotify( nw_signal ); return TRUE; } /*! \internal */ void QObject::connectInternal( const QObject *sender, int signal_index, const QObject *receiver, int membcode, int member_index ) { QObject *s = (QObject*)sender; QObject *r = (QObject*)receiver; if ( !s->connections ) { // create connections lookup table s->connections = new QSignalVec( signal_index+1 ); Q_CHECK_PTR( s->connections ); s->connections->setAutoDelete( TRUE ); } QConnectionList *clist = s->connections->at( signal_index ); if ( !clist ) { // create receiver list clist = new QConnectionList; Q_CHECK_PTR( clist ); clist->setAutoDelete( TRUE ); s->connections->insert( signal_index, clist ); } QMetaObject *rmeta = r->metaObject(); const QMetaData *rm = 0; switch ( membcode ) { // get receiver member case QSLOT_CODE: rm = rmeta->slot( member_index, TRUE ); break; case QSIGNAL_CODE: rm = rmeta->signal( member_index, TRUE ); break; } QConnection *c = new QConnection( r, member_index, rm ? rm->name : "qt_invoke", membcode ); Q_CHECK_PTR( c ); clist->append( c ); if ( !r->senderObjects ) // create list of senders r->senderObjects = new QSenderObjectList; r->senderObjects->append( s ); // add sender to list } /*! \overload bool QObject::disconnect( const char *signal, const QObject *receiver, const char *member ) Disconnects \a signal from \a member of \a receiver. A signal-slot connection is removed when either of the objects involved are destroyed. */ /*! \overload bool QObject::disconnect( const QObject *receiver, const char *member ) Disconnects all signals in this object from \a receiver's \a member. A signal-slot connection is removed when either of the objects involved are destroyed. */ /*! Disconnects \a signal in object \a sender from \a member in object \a receiver. A signal-slot connection is removed when either of the objects involved are destroyed. disconnect() is typically used in three ways, as the following examples demonstrate. \list 1 \i Disconnect everything connected to an object's signals: \code disconnect( myObject, 0, 0, 0 ); \endcode equivalent to the non-static overloaded function \code myObject->disconnect(); \endcode \i Disconnect everything connected to a specific signal: \code disconnect( myObject, SIGNAL(mySignal()), 0, 0 ); \endcode equivalent to the non-static overloaded function \code myObject->disconnect( SIGNAL(mySignal()) ); \endcode \i Disconnect a specific receiver: \code disconnect( myObject, 0, myReceiver, 0 ); \endcode equivalent to the non-static overloaded function \code myObject->disconnect( myReceiver ); \endcode \endlist 0 may be used as a wildcard, meaning "any signal", "any receiving object", or "any slot in the receiving object", respectively. The \a sender may never be 0. (You cannot disconnect signals from more than one object in a single call.) If \a signal is 0, it disconnects \a receiver and \a member from any signal. If not, only the specified signal is disconnected. If \a receiver is 0, it disconnects anything connected to \a signal. If not, slots in objects other than \a receiver are not disconnected. If \a member is 0, it disconnects anything that is connected to \a receiver. If not, only slots named \a member will be disconnected, and all other slots are left alone. The \a member must be 0 if \a receiver is left out, so you cannot disconnect a specifically-named slot on all objects. \sa connect() */ bool QObject::disconnect( const QObject *sender, const char *signal, const QObject *receiver, const char *member ) { #if defined(QT_CHECK_NULL) if ( sender == 0 || (receiver == 0 && member != 0) ) { qWarning( "QObject::disconnect: Unexpected null parameter" ); return FALSE; } #endif if ( !sender->connections ) // no connected signals return FALSE; QObject *s = (QObject *)sender; QObject *r = (QObject *)receiver; int member_index = -1; int membcode = -1; QCString nw_member; if ( member ) { membcode = member[0] - '0'; #if defined(QT_CHECK_RANGE) if ( !check_member_code( membcode, r, member, "disconnect" ) ) return FALSE; #endif ++member; QMetaObject *rmeta = r->metaObject(); switch ( membcode ) { // get receiver member case QSLOT_CODE: member_index = rmeta->findSlot( member, TRUE ); if ( member_index < 0 ) { // normalize and retry nw_member = qt_rmWS(member); // remove whitespace member = nw_member; member_index = rmeta->findSlot( member, TRUE ); } break; case QSIGNAL_CODE: member_index = rmeta->findSignal( member, TRUE ); if ( member_index < 0 ) { // normalize and retry nw_member = qt_rmWS(member); // remove whitespace member = nw_member; member_index = rmeta->findSignal( member, TRUE ); } break; } if ( member_index < 0 ) { // no such member #if defined(QT_CHECK_RANGE) err_member_notfound( membcode, r, member, "disconnect" ); err_info_about_candidates( membcode, rmeta, member, "connect" ); err_info_about_objects( "disconnect", sender, receiver ); #endif return FALSE; } } if ( signal == 0 ) { // any/all signals if ( disconnectInternal( s, -1, r, membcode, member_index ) ) s->disconnectNotify( 0 ); else return FALSE; } else { // specific signal #if defined(QT_CHECK_RANGE) if ( !check_signal_macro( s, signal, "disconnect", "unbind" ) ) return FALSE; #endif QCString nw_signal(signal); // Assume already normalized ++signal; // skip member type code QMetaObject *smeta = s->metaObject(); if ( !smeta ) // no meta object return FALSE; int signal_index = smeta->findSignal( signal, TRUE ); if ( signal_index < 0 ) { // normalize and retry nw_signal = qt_rmWS( signal-1 ); // remove whitespace signal = nw_signal.data()+1; // skip member type code signal_index = smeta->findSignal( signal, TRUE ); } if ( signal_index < 0 ) { #if defined(QT_CHECK_RANGE) qWarning( "QObject::disconnect: No such signal %s::%s", s->className(), signal ); #endif return FALSE; } /* compatibility and safety: If a receiver has several slots * with the same name, disconnect them all*/ bool res = FALSE; if ( membcode == QSLOT_CODE && r ) { QMetaObject * rmeta = r->metaObject(); do { int mi = rmeta->findSlot( member ); if ( mi != -1 ) res |= disconnectInternal( s, signal_index, r, membcode, mi ); } while ( (rmeta = rmeta->superClass()) ); } else { res = disconnectInternal( s, signal_index, r, membcode, member_index ); } if ( res ) s->disconnectNotify( nw_signal ); return res; } return TRUE; } /*! \internal */ bool QObject::disconnectInternal( const QObject *sender, int signal_index, const QObject *receiver, int membcode, int member_index ) { QObject *s = (QObject*)sender; QObject *r = (QObject*)receiver; if ( !s->connections ) return FALSE; bool success = FALSE; QConnectionList *clist; register QConnection *c; if ( signal_index == -1 ) { for ( int i = 0; i < (int) s->connections->size(); i++ ) { clist = (*s->connections)[i]; // for all signals... if ( !clist ) continue; c = clist->first(); while ( c ) { // for all receivers... if ( r == 0 ) { // remove all receivers removeObjFromList( c->object()->senderObjects, s ); success = TRUE; c = clist->next(); } else if ( r == c->object() && ( member_index == -1 || member_index == c->member() && c->memberType() == membcode ) ) { removeObjFromList( c->object()->senderObjects, s ); success = TRUE; clist->remove(); c = clist->current(); } else { c = clist->next(); } } if ( r == 0 ) // disconnect all receivers s->connections->insert( i, 0 ); } } else { clist = s->connections->at( signal_index ); if ( !clist ) return FALSE; c = clist->first(); while ( c ) { // for all receivers... if ( r == 0 ) { // remove all receivers removeObjFromList( c->object()->senderObjects, s, TRUE ); success = TRUE; c = clist->next(); } else if ( r == c->object() && ( member_index == -1 || member_index == c->member() && c->memberType() == membcode ) ) { removeObjFromList( c->object()->senderObjects, s, TRUE ); success = TRUE; clist->remove(); c = clist->current(); } else { c = clist->next(); } } if ( r == 0 ) // disconnect all receivers s->connections->insert( signal_index, 0 ); } return success; } /*! \fn QObject::destroyed() This signal is emitted when the object is being destroyed. Note that the signal is emitted by the QObject destructor, so the object's virtual table is already degenerated at this point, and it is not safe to call any functions on the object emitting the signal. This signal can not be blocked. All the objects's children are destroyed immediately after this signal is emitted. */ /*! \overload QObject::destroyed( QObject* obj) This signal is emitted immediately before the object \a obj is destroyed, and can not be blocked. All the objects's children are destroyed immediately after this signal is emitted. */ /*! Performs a deferred deletion of this object. Instead of an immediate deletion this function schedules a deferred delete event for processing when Qt returns to the main event loop. */ void QObject::deleteLater() { QApplication::postEvent( this, new QEvent( QEvent::DeferredDelete) ); } /*! This slot is connected to the destroyed() signal of other objects that have installed event filters on this object. When the other object, \a obj, is destroyed, we want to remove its event filter. */ void QObject::cleanupEventFilter(QObject* obj) { removeEventFilter( obj ); } /*! \fn QString QObject::tr( const char *sourceText, const char * comment ) \reentrant Returns a translated version of \a sourceText, or \a sourceText itself if there is no appropriate translated version. The translation context is QObject with \a comment (0 by default). All QObject subclasses using the Q_OBJECT macro automatically have a reimplementation of this function with the subclass name as context. \warning This method is reentrant only if all translators are installed \e before calling this method. Installing or removing translators while performing translations is not supported. Doing so will probably result in crashes or other undesirable behavior. \sa trUtf8() QApplication::translate() \link i18n.html Internationalization with Qt\endlink */ /*! \fn QString QObject::trUtf8( const char *sourceText, const char *comment ) \reentrant Returns a translated version of \a sourceText, or QString::fromUtf8(\a sourceText) if there is no appropriate version. It is otherwise identical to tr(\a sourceText, \a comment). \warning This method is reentrant only if all translators are installed \e before calling this method. Installing or removing translators while performing translations is not supported. Doing so will probably result in crashes or other undesirable behavior. \sa tr() QApplication::translate() */ static QMetaObjectCleanUp cleanUp_Qt = QMetaObjectCleanUp( "QObject", &QObject::staticMetaObject ); QMetaObject* QObject::staticQtMetaObject() { static QMetaObject* qtMetaObject = 0; if ( qtMetaObject ) return qtMetaObject; #ifndef QT_NO_PROPERTIES static const QMetaEnum::Item enum_0[] = { { "AlignLeft", (int) Qt::AlignLeft }, { "AlignRight", (int) Qt::AlignRight }, { "AlignHCenter", (int) Qt::AlignHCenter }, { "AlignTop", (int) Qt::AlignTop }, { "AlignBottom", (int) Qt::AlignBottom }, { "AlignVCenter", (int) Qt::AlignVCenter }, { "AlignCenter", (int) Qt::AlignCenter }, { "AlignAuto", (int) Qt::AlignAuto }, { "AlignJustify", (int) Qt::AlignJustify }, { "WordBreak", (int) Qt::WordBreak } }; static const QMetaEnum::Item enum_1[] = { { "Horizontal", (int) Qt::Horizontal }, { "Vertical", (int) Qt::Vertical } }; static const QMetaEnum::Item enum_2[] = { { "PlainText", (int) Qt::PlainText }, { "RichText", (int) Qt::RichText }, { "AutoText", (int) Qt::AutoText }, { "LogText", (int) Qt::LogText } }; static const QMetaEnum::Item enum_3[] = { { "NoBackground", (int) Qt::NoBackground }, { "PaletteForeground", (int) Qt::PaletteForeground }, { "PaletteButton", (int) Qt::PaletteButton }, { "PaletteLight", (int) Qt::PaletteLight }, { "PaletteMidlight", (int) Qt::PaletteMidlight }, { "PaletteDark", (int) Qt::PaletteDark }, { "PaletteMid", (int) Qt::PaletteMid }, { "PaletteText", (int) Qt::PaletteText }, { "PaletteBrightText", (int) Qt::PaletteBrightText }, { "PaletteBase", (int) Qt::PaletteBase }, { "PaletteBackground", (int) Qt::PaletteBackground }, { "PaletteShadow", (int) Qt::PaletteShadow }, { "PaletteHighlight", (int) Qt::PaletteHighlight }, { "PaletteHighlightedText", (int) Qt::PaletteHighlightedText }, { "PaletteButtonText", (int) Qt::PaletteButtonText }, { "PaletteLink", (int) Qt::PaletteLink }, { "PaletteLinkVisited", (int) Qt::PaletteLinkVisited } }; static const QMetaEnum::Item enum_4[] = { { "TextDate", (int) Qt::TextDate }, { "ISODate", (int) Qt::ISODate }, { "LocalDate", (int) Qt::LocalDate } }; static const QMetaEnum enum_tbl[] = { { "Alignment", 10, enum_0, TRUE }, { "Orientation", 2, enum_1, FALSE }, { "TextFormat", 4, enum_2, FALSE }, { "BackgroundMode", 17, enum_3, FALSE }, { "DateFormat", 3, enum_4, FALSE } }; #endif qtMetaObject = new QMetaObject( "Qt", 0, 0, 0, 0, 0, #ifndef QT_NO_PROPERTIES 0, 0, enum_tbl, 5, #endif 0, 0 ); cleanUp_Qt.setMetaObject( qtMetaObject ); return qtMetaObject; } /*! \internal Signal activation with the most frequently used parameter/argument types. All other combinations are generated by the meta object compiler. */ void QObject::activate_signal( int signal ) { #ifndef QT_NO_PRELIMINARY_SIGNAL_SPY if ( qt_preliminary_signal_spy ) { if ( !signalsBlocked() && signal >= 0 && ( !connections || !connections->at( signal ) ) ) { QUObject o[1]; qt_spy_signal( this, signal, o ); return; } } #endif if ( !connections || signalsBlocked() || signal < 0 ) return; QConnectionList *clist = connections->at( signal ); if ( !clist ) return; QUObject o[1]; activate_signal( clist, o ); } /*! \internal */ void QObject::activate_signal( QConnectionList *clist, QUObject *o ) { if ( !clist ) return; #ifndef QT_NO_PRELIMINARY_SIGNAL_SPY if ( qt_preliminary_signal_spy ) qt_spy_signal( this, connections->findRef( clist), o ); #endif QObject *object; QSenderObjectList* sol; QObject* oldSender = 0; QConnection *c; if ( clist->count() == 1 ) { // save iterator c = clist->first(); object = c->object(); sol = object->senderObjects; if ( sol ) { oldSender = sol->currentSender; sol->ref(); sol->currentSender = this; } if ( c->memberType() == QSIGNAL_CODE ) object->qt_emit( c->member(), o ); else object->qt_invoke( c->member(), o ); if ( sol ) { sol->currentSender = oldSender; if ( sol->deref() ) delete sol; } } else { QConnection *cd = 0; QConnectionListIt it(*clist); while ( (c=it.current()) ) { ++it; if ( c == cd ) continue; cd = c; object = c->object(); sol = object->senderObjects; if ( sol ) { oldSender = sol->currentSender; sol->ref(); sol->currentSender = this; } if ( c->memberType() == QSIGNAL_CODE ) object->qt_emit( c->member(), o ); else object->qt_invoke( c->member(), o ); if (sol ) { sol->currentSender = oldSender; if ( sol->deref() ) delete sol; } } } } /*! \overload void QObject::activate_signal( int signal, int ) */ /*! \overload void QObject::activate_signal( int signal, double ) */ /*! \overload void QObject::activate_signal( int signal, QString ) */ /*! \fn void QObject::activate_signal_bool( int signal, bool ) \internal Like the above functions, but since bool is sometimes only a typedef it cannot be a simple overload. */ #ifndef QT_NO_PRELIMINARY_SIGNAL_SPY #define ACTIVATE_SIGNAL_WITH_PARAM(FNAME,TYPE) \ void QObject::FNAME( int signal, TYPE param ) \ { \ if ( qt_preliminary_signal_spy ) { \ if ( !signalsBlocked() && signal >= 0 && \ ( !connections || !connections->at( signal ) ) ) { \ QUObject o[2]; \ static_QUType_##TYPE.set( o+1, param ); \ qt_spy_signal( this, signal, o ); \ return; \ } \ } \ if ( !connections || signalsBlocked() || signal < 0 ) \ return; \ QConnectionList *clist = connections->at( signal ); \ if ( !clist ) \ return; \ QUObject o[2]; \ static_QUType_##TYPE.set( o+1, param ); \ activate_signal( clist, o ); \ } #else #define ACTIVATE_SIGNAL_WITH_PARAM(FNAME,TYPE) \ void QObject::FNAME( int signal, TYPE param ) \ { \ if ( !connections || signalsBlocked() || signal < 0 ) \ return; \ QConnectionList *clist = connections->at( signal ); \ if ( !clist ) \ return; \ QUObject o[2]; \ static_QUType_##TYPE.set( o+1, param ); \ activate_signal( clist, o ); \ } #endif // We don't want to duplicate too much text so... ACTIVATE_SIGNAL_WITH_PARAM( activate_signal, int ) ACTIVATE_SIGNAL_WITH_PARAM( activate_signal, double ) ACTIVATE_SIGNAL_WITH_PARAM( activate_signal, QString ) ACTIVATE_SIGNAL_WITH_PARAM( activate_signal_bool, bool ) /***************************************************************************** QObject debugging output routines. *****************************************************************************/ static void dumpRecursive( int level, QObject *object ) { #if defined(QT_DEBUG) if ( object ) { QString buf; buf.fill( '\t', level/2 ); if ( level % 2 ) buf += " "; const char *name = object->name(); QString flags=""; if ( qApp->focusWidget() == object ) flags += 'F'; if ( object->isWidgetType() ) { QWidget * w = (QWidget *)object; if ( w->isVisible() ) { QString t( "<%1,%2,%3,%4>" ); flags += t.arg(w->x()).arg(w->y()).arg(w->width()).arg(w->height()); } else { flags += 'I'; } } qDebug( "%s%s::%s %s", (const char*)buf, object->className(), name, flags.latin1() ); if ( object->children() ) { QObjectListIt it(*object->children()); QObject * c; while ( (c=it.current()) != 0 ) { ++it; dumpRecursive( level+1, c ); } } } #else Q_UNUSED( level ) Q_UNUSED( object ) #endif } /*! Dumps a tree of children to the debug output. This function is useful for debugging, but does nothing if the library has been compiled in release mode (i.e. without debugging information). */ void QObject::dumpObjectTree() { dumpRecursive( 0, this ); } /*! Dumps information about signal connections, etc. for this object to the debug output. This function is useful for debugging, but does nothing if the library has been compiled in release mode (i.e. without debugging information). */ void QObject::dumpObjectInfo() { #if defined(QT_DEBUG) qDebug( "OBJECT %s::%s", className(), name( "unnamed" ) ); int n = 0; qDebug( " SIGNALS OUT" ); if ( connections ) { QConnectionList *clist; for ( uint i = 0; i < connections->size(); i++ ) { if ( ( clist = connections->at( i ) ) ) { qDebug( "\t%s", metaObject()->signal( i, TRUE )->name ); n++; register QConnection *c; QConnectionListIt cit(*clist); while ( (c=cit.current()) ) { ++cit; qDebug( "\t --> %s::%s %s", c->object()->className(), c->object()->name( "unnamed" ), c->memberName() ); } } } } if ( n == 0 ) qDebug( "\t" ); qDebug( " SIGNALS IN" ); n = 0; if ( senderObjects ) { QObject *sender = senderObjects->first(); while ( sender ) { qDebug( "\t%s::%s", sender->className(), sender->name( "unnamed" ) ); n++; sender = senderObjects->next(); } } if ( n == 0 ) qDebug( "\t" ); #endif } #ifndef QT_NO_PROPERTIES /*! Sets the value of the object's \a name property to \a value. Returns TRUE if the operation was successful; otherwise returns FALSE. Information about all available properties is provided through the metaObject(). \sa property(), metaObject(), QMetaObject::propertyNames(), QMetaObject::property() */ bool QObject::setProperty( const char *name, const QVariant& value ) { if ( !value.isValid() ) return FALSE; QVariant v = value; QMetaObject* meta = metaObject(); if ( !meta ) return FALSE; int id = meta->findProperty( name, TRUE ); const QMetaProperty* p = meta->property( id, TRUE ); if ( !p || !p->isValid() || !p->writable() ) { qWarning( "%s::setProperty( \"%s\", value ) failed: property invalid, read-only or does not exist", className(), name ); return FALSE; } if ( p->isEnumType() ) { if ( v.type() == QVariant::String || v.type() == QVariant::CString ) { if ( p->isSetType() ) { QString s = value.toString(); // QStrList does not support split, use QStringList for that. QStringList l = QStringList::split( '|', s ); QStrList keys; for ( QStringList::Iterator it = l.begin(); it != l.end(); ++it ) keys.append( (*it).stripWhiteSpace().latin1() ); v = QVariant( p->keysToValue( keys ) ); } else { v = QVariant( p->keyToValue( value.toCString().data() ) ); } } else if ( v.type() != QVariant::Int && v.type() != QVariant::UInt ) { return FALSE; } return qt_property( id, 0, &v ); } QVariant::Type type = (QVariant::Type)(p->flags >> 24); if ( type == QVariant::Invalid ) type = QVariant::nameToType( p->type() ); if ( type != QVariant::Invalid && !v.canCast( type ) ) return FALSE; return qt_property( id, 0, &v ); } /*! Returns the value of the object's \a name property. If no such property exists, the returned variant is invalid. Information about all available properties are provided through the metaObject(). \sa setProperty(), QVariant::isValid(), metaObject(), QMetaObject::propertyNames(), QMetaObject::property() */ QVariant QObject::property( const char *name ) const { QVariant v; QMetaObject* meta = metaObject(); if ( !meta ) return v; int id = meta->findProperty( name, TRUE ); const QMetaProperty* p = meta->property( id, TRUE ); if ( !p || !p->isValid() ) { qWarning( "%s::property( \"%s\" ) failed: property invalid or does not exist", className(), name ); return v; } QObject* that = (QObject*) this; // moc ensures constness for the qt_property call that->qt_property( id, 1, &v ); return v; } #endif // QT_NO_PROPERTIES #ifndef QT_NO_USERDATA /*!\internal */ uint QObject::registerUserData() { static int user_data_registration = 0; return user_data_registration++; } /*!\internal */ QObjectUserData::~QObjectUserData() { } /*!\internal */ void QObject::setUserData( uint id, QObjectUserData* data) { if ( !d ) d = new QObjectPrivate( id+1 ); if ( id >= d->size() ) d->resize( id+1 ); d->insert( id, data ); } /*!\internal */ QObjectUserData* QObject::userData( uint id ) const { if ( d && id < d->size() ) return d->at( id ); return 0; } #endif // QT_NO_USERDATA