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Diffstat (limited to 'src/declarative/qml/qdeclarativenotifier_p.h')
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diff --git a/src/declarative/qml/qdeclarativenotifier_p.h b/src/declarative/qml/qdeclarativenotifier_p.h new file mode 100644 index 0000000..a0e6b43 --- /dev/null +++ b/src/declarative/qml/qdeclarativenotifier_p.h @@ -0,0 +1,272 @@ +/**************************************************************************** +** +** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtDeclarative module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#ifndef QDECLARATIVENOTIFIER_P_H +#define QDECLARATIVENOTIFIER_P_H + +#include "qdeclarativeguard_p.h" + +QT_BEGIN_NAMESPACE + +class QDeclarativeNotifierEndpoint; +class QDeclarativeNotifier +{ +public: + inline QDeclarativeNotifier(); + inline ~QDeclarativeNotifier(); + inline void notify(); + +private: + friend class QDeclarativeNotifierEndpoint; + + static void emitNotify(QDeclarativeNotifierEndpoint *); + QDeclarativeNotifierEndpoint *endpoints; +}; + +class QDeclarativeNotifierEndpoint +{ +public: + inline QDeclarativeNotifierEndpoint(); + inline QDeclarativeNotifierEndpoint(QObject *t, int m); + inline ~QDeclarativeNotifierEndpoint(); + + QObject *target; + int targetMethod; + + inline bool isConnected(); + inline bool isConnected(QObject *source, int sourceSignal); + inline bool isConnected(QDeclarativeNotifier *); + + inline void connect(QObject *source, int sourceSignal); + inline void connect(QDeclarativeNotifier *); + inline void disconnect(); + + void copyAndClear(QDeclarativeNotifierEndpoint &other); + +private: + friend class QDeclarativeNotifier; + + struct Signal { + QDeclarativeGuard<QObject> source; + int sourceSignal; + }; + + struct Notifier { + QDeclarativeNotifier *notifier; + Notifier **disconnected; + + QDeclarativeNotifierEndpoint *next; + QDeclarativeNotifierEndpoint **prev; + }; + + enum { InvalidType, SignalType, NotifierType } type; + union { + char signalData[sizeof(Signal)]; + char notifierData[sizeof(Notifier)]; + }; + + inline Notifier *toNotifier(); + inline Notifier *asNotifier(); + inline Signal *toSignal(); + inline Signal *asSignal(); +}; + +QDeclarativeNotifier::QDeclarativeNotifier() +: endpoints(0) +{ + QDeclarativeNotifierEndpoint *endpoint = endpoints; + while (endpoint) { + QDeclarativeNotifierEndpoint *next = endpoint->asNotifier()->next; + endpoint->asNotifier()->next = 0; + endpoint->asNotifier()->prev = 0; + endpoint->asNotifier()->notifier = 0; + endpoint = next; + } +} + +QDeclarativeNotifier::~QDeclarativeNotifier() +{ +} + +void QDeclarativeNotifier::notify() +{ + if (endpoints) emitNotify(endpoints); +} + +QDeclarativeNotifierEndpoint::QDeclarativeNotifierEndpoint() +: target(0), targetMethod(0), type(InvalidType) +{ +} + +QDeclarativeNotifierEndpoint::QDeclarativeNotifierEndpoint(QObject *t, int m) +: target(t), targetMethod(m), type(InvalidType) +{ +} + +QDeclarativeNotifierEndpoint::~QDeclarativeNotifierEndpoint() +{ + disconnect(); + if (SignalType == type) { + Signal *s = asSignal(); + s->~Signal(); + } +} + +bool QDeclarativeNotifierEndpoint::isConnected() +{ + if (SignalType == type) { + return asSignal()->source; + } else if (NotifierType == type) { + return asNotifier()->notifier; + } else { + return false; + } +} + +bool QDeclarativeNotifierEndpoint::isConnected(QObject *source, int sourceSignal) +{ + return SignalType == type && asSignal()->source == source && asSignal()->sourceSignal == sourceSignal; +} + +bool QDeclarativeNotifierEndpoint::isConnected(QDeclarativeNotifier *notifier) +{ + return NotifierType == type && asNotifier()->notifier == notifier; +} + +void QDeclarativeNotifierEndpoint::connect(QObject *source, int sourceSignal) +{ + Signal *s = toSignal(); + + if (s->source == source && s->sourceSignal == sourceSignal) + return; + + disconnect(); + + QMetaObject::connect(source, sourceSignal, target, targetMethod); + + s->source = source; + s->sourceSignal = sourceSignal; +} + +void QDeclarativeNotifierEndpoint::connect(QDeclarativeNotifier *notifier) +{ + Notifier *n = toNotifier(); + + if (n->notifier == notifier) + return; + + disconnect(); + + n->next = notifier->endpoints; + if (n->next) { n->next->asNotifier()->prev = &n->next; } + notifier->endpoints = this; + n->prev = ¬ifier->endpoints; + n->notifier = notifier; +} + +void QDeclarativeNotifierEndpoint::disconnect() +{ + if (type == SignalType) { + Signal *s = (Signal *)&signalData; + if (s->source) { + QMetaObject::disconnectOne(s->source, s->sourceSignal, target, targetMethod); + s->source = 0; + } + } else if (type == NotifierType) { + Notifier *n = asNotifier(); + + if (n->next) n->next->asNotifier()->prev = n->prev; + if (n->prev) *n->prev = n->next; + if (n->disconnected) *n->disconnected = 0; + n->next = 0; + n->prev = 0; + n->disconnected = 0; + n->notifier = 0; + } +} + +QDeclarativeNotifierEndpoint::Notifier *QDeclarativeNotifierEndpoint::toNotifier() +{ + if (NotifierType == type) + return asNotifier(); + + if (SignalType == type) { + disconnect(); + Signal *s = asSignal(); + s->~Signal(); + } + + Notifier *n = asNotifier(); + n->next = 0; + n->prev = 0; + n->disconnected = 0; + n->notifier = 0; + type = NotifierType; + return n; +} + +QDeclarativeNotifierEndpoint::Notifier *QDeclarativeNotifierEndpoint::asNotifier() +{ + return (Notifier *)(¬ifierData); +} + +QDeclarativeNotifierEndpoint::Signal *QDeclarativeNotifierEndpoint::toSignal() +{ + if (SignalType == type) + return asSignal(); + + disconnect(); + Signal *s = asSignal(); + new (s) Signal; + type = SignalType; + + return s; +} + +QDeclarativeNotifierEndpoint::Signal *QDeclarativeNotifierEndpoint::asSignal() +{ + return (Signal *)(&signalData); +} + +QT_END_NAMESPACE + +#endif // QDECLARATIVENOTIFIER_P_H + |