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Diffstat (limited to 'src/qml/qml/qqmlnotifier_p.h')
| -rw-r--r-- | src/qml/qml/qqmlnotifier_p.h | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/src/qml/qml/qqmlnotifier_p.h b/src/qml/qml/qqmlnotifier_p.h new file mode 100644 index 0000000000..ab0711341d --- /dev/null +++ b/src/qml/qml/qqmlnotifier_p.h @@ -0,0 +1,206 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/ +** +** This file is part of the QtQml module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** GNU Lesser General Public License Usage +** This file may be used under the terms of the GNU Lesser General Public +** License version 2.1 as published by the Free Software Foundation and +** appearing in the file LICENSE.LGPL included in the packaging of this +** file. Please review the following information to ensure the GNU Lesser +** General Public License version 2.1 requirements will be met: +** 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. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU General +** Public License version 3.0 as published by the Free Software Foundation +** and appearing in the file LICENSE.GPL included in the packaging of this +** file. Please review the following information to ensure the GNU General +** Public License version 3.0 requirements will be met: +** http://www.gnu.org/copyleft/gpl.html. +** +** Other Usage +** Alternatively, this file may be used in accordance with the terms and +** conditions contained in a signed written agreement between you and Nokia. +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#ifndef QQMLNOTIFIER_P_H +#define QQMLNOTIFIER_P_H + +#include "qqmldata_p.h" +#include "qqmlguard_p.h" + +QT_BEGIN_NAMESPACE + +class QQmlNotifierEndpoint; +class Q_QML_EXPORT QQmlNotifier +{ +public: + inline QQmlNotifier(); + inline ~QQmlNotifier(); + inline void notify(); + +private: + friend class QQmlData; + friend class QQmlNotifierEndpoint; + + static void emitNotify(QQmlNotifierEndpoint *); + QQmlNotifierEndpoint *endpoints; +}; + +class QQmlNotifierEndpoint +{ +public: + inline QQmlNotifierEndpoint(); + inline ~QQmlNotifierEndpoint(); + + typedef void (*Callback)(QQmlNotifierEndpoint *); + Callback callback; + + inline bool isConnected(); + inline bool isConnected(QObject *source, int sourceSignal); + inline bool isConnected(QQmlNotifier *); + + void connect(QObject *source, int sourceSignal); + inline void connect(QQmlNotifier *); + inline void disconnect(); + + inline bool isNotifying() const; + inline void cancelNotify(); + + void copyAndClear(QQmlNotifierEndpoint &other); + +private: + friend class QQmlData; + friend class QQmlNotifier; + + union { + QQmlNotifier *notifier; + QObject *source; + }; + unsigned int notifying : 1; + signed int sourceSignal : 31; + QQmlNotifierEndpoint **disconnected; + QQmlNotifierEndpoint *next; + QQmlNotifierEndpoint **prev; +}; + +QQmlNotifier::QQmlNotifier() +: endpoints(0) +{ +} + +QQmlNotifier::~QQmlNotifier() +{ + QQmlNotifierEndpoint *endpoint = endpoints; + while (endpoint) { + QQmlNotifierEndpoint *n = endpoint; + endpoint = n->next; + + n->next = 0; + n->prev = 0; + n->notifier = 0; + n->sourceSignal = -1; + if (n->disconnected) *n->disconnected = 0; + n->disconnected = 0; + } + endpoints = 0; +} + +void QQmlNotifier::notify() +{ + if (endpoints) emitNotify(endpoints); +} + +QQmlNotifierEndpoint::QQmlNotifierEndpoint() +: callback(0), notifier(0), notifying(0), sourceSignal(-1), disconnected(0), next(0), prev(0) +{ +} + +QQmlNotifierEndpoint::~QQmlNotifierEndpoint() +{ + disconnect(); +} + +bool QQmlNotifierEndpoint::isConnected() +{ + return prev != 0; +} + +bool QQmlNotifierEndpoint::isConnected(QObject *source, int sourceSignal) +{ + return this->sourceSignal != -1 && this->source == source && this->sourceSignal == sourceSignal; +} + +bool QQmlNotifierEndpoint::isConnected(QQmlNotifier *notifier) +{ + return sourceSignal == -1 && this->notifier == notifier; +} + +void QQmlNotifierEndpoint::connect(QQmlNotifier *notifier) +{ + disconnect(); + + next = notifier->endpoints; + if (next) { next->prev = &next; } + notifier->endpoints = this; + prev = ¬ifier->endpoints; + this->notifier = notifier; +} + +void QQmlNotifierEndpoint::disconnect() +{ + if (next) next->prev = prev; + if (prev) *prev = next; + if (disconnected) *disconnected = 0; + next = 0; + prev = 0; + disconnected = 0; + notifier = 0; + notifying = 0; + sourceSignal = -1; +} + +/*! +Returns true if a notify is in progress. This means that the signal or QQmlNotifier +that this endpoing is connected to has been triggered, but this endpoint's callback has not +yet been called. + +An in progress notify can be cancelled by calling cancelNotify. +*/ +bool QQmlNotifierEndpoint::isNotifying() const +{ + return notifying == 1; +} + +/*! +Cancel any notifies that are in progress. +*/ +void QQmlNotifierEndpoint::cancelNotify() +{ + notifying = 0; + if (disconnected) { + *disconnected = 0; + disconnected = 0; + } +} + +QT_END_NAMESPACE + +#endif // QQMLNOTIFIER_P_H + |