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Diffstat (limited to 'src/qml/qml/qqmlaccessors_p.h')
| -rw-r--r-- | src/qml/qml/qqmlaccessors_p.h | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/src/qml/qml/qqmlaccessors_p.h b/src/qml/qml/qqmlaccessors_p.h new file mode 100644 index 0000000000..a603bede9f --- /dev/null +++ b/src/qml/qml/qqmlaccessors_p.h @@ -0,0 +1,166 @@ +/**************************************************************************** +** +** 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 QQMLACCESSORS_P_H +#define QQMLACCESSORS_P_H + +#include <QtQml/qtqmlglobal.h> +#include <QtCore/qvector.h> +#include <QtCore/qhash.h> +#include <QtCore/QReadWriteLock> + +QT_BEGIN_HEADER + +QT_BEGIN_NAMESPACE + +class QObject; +class QQmlNotifier; + +// QML "accessor properties" allow V4 and V8 to bypass Qt's meta system to read and, more +// importantly, subscribe to properties directly. Any property that is primarily read +// from bindings is a candidate for inclusion as an accessor property. +// +// To define accessor properties, use the QML_DECLARE_PROPERTIES() and QML_DEFINE_PROPERTIES() +// macros. The QML_DECLARE_PROPERTIES() macro is used to specify the properties, and the +// QML_DEFINE_PROPERTIES() macro to register the properties with the +// QQmlAccessorProperties singleton. +// +// A class with accessor properties must also add the Q_CLASSINFO("qt_HasQmlAccessors", "true") +// tag to its declaration. This is essential for QML to maintain internal consistency, +// and forgetting to do so will probably cause your application to qFatal() with a +// helpful reminder of this requirement. +// +// It is important that QML_DEFINE_PROPERTIES() has been called before QML ever sees +// the type with the accessor properties. As QML_DEFINE_PROPERTIES() is idempotent, it is +// recommended to call it in the type's constructor as well as when the type is registered +// as a QML element (if it ever is). QML_DEFINE_PROPERTIES() is a very cheap operation +// if registration has already occurred. + +#define QML_DECLARE_PROPERTIES(type) \ + static volatile bool qqml_accessor_properties_isregistered_ ## type = false; \ + static QQmlAccessorProperties::Property qqml_accessor_properties_ ## type[] = + +#define QML_DEFINE_PROPERTIES(type) \ + do { \ + if (!qqml_accessor_properties_isregistered_ ## type) { \ + int count = sizeof(qqml_accessor_properties_ ## type) / \ + sizeof(QQmlAccessorProperties::Property); \ + QQmlAccessorProperties::registerProperties(&type::staticMetaObject, count, \ + qqml_accessor_properties_ ## type);\ + qqml_accessor_properties_isregistered_ ## type = true; \ + } \ + } while (false); + +#define QML_PRIVATE_ACCESSOR(clazz, cpptype, name, variable) \ + static void clazz ## _ ## name ## Read(QObject *o, intptr_t, void *rv) \ + { \ + clazz ## Private *d = clazz ## Private::get(static_cast<clazz *>(o)); \ + *static_cast<cpptype *>(rv) = d->variable; \ + } + +#define QML_PROPERTY_NAME(name) #name, sizeof #name - 1 + +class QQmlAccessors +{ +public: + void (*read)(QObject *object, intptr_t property, void *output); + void (*notifier)(QObject *object, intptr_t property, QQmlNotifier **notifier); +}; + +namespace QQmlAccessorProperties { + struct Property { + const char *name; + unsigned int nameLength; + intptr_t data; + QQmlAccessors *accessors; + }; + + struct Properties { + inline Properties(); + Properties(Property *, int); + + bool operator==(const Properties &o) const { + return count == o.count && properties == o.properties; + } + + inline Property *property(const char *name); + + int count; + Property *properties; + quint32 nameMask; + }; + + Properties properties(const QMetaObject *); + void Q_QML_EXPORT registerProperties(const QMetaObject *, int, Property *); +}; + +QQmlAccessorProperties::Property * +QQmlAccessorProperties::Properties::property(const char *name) +{ + if (count == 0) + return 0; + + unsigned int length = strlen(name); + + Q_ASSERT(length); + + if (nameMask & (1 << qMin(31U, length - 1))) { + + for (int ii = 0; ii < count; ++ii) { + if (properties[ii].nameLength == length && 0 == qstrcmp(name, properties[ii].name)) + return &properties[ii]; + } + + } + + return 0; +} + +QQmlAccessorProperties::Properties::Properties() +: count(0), properties(0), nameMask(0) +{ +} + +QT_END_NAMESPACE + +QT_END_HEADER + +#endif // QQMLACCESSORS_P_H |