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42 #ifndef QQMLACCESSORS_P_H
43 #define QQMLACCESSORS_P_H
45 #include <private/qtqmlglobal_p.h>
46 #include <QtCore/qbytearray.h>
47 #include <QtCore/qvector.h>
48 #include <QtCore/qhash.h>
49 #include <QtCore/QReadWriteLock>
51 #if defined(Q_OS_QNX) || defined(Q_OS_LINUX)
63 // QML "accessor properties" allow V4 and V8 to bypass Qt's meta system to read and, more
64 // importantly, subscribe to properties directly. Any property that is primarily read
65 // from bindings is a candidate for inclusion as an accessor property.
67 // To define accessor properties, use the QML_DECLARE_PROPERTIES() and QML_DEFINE_PROPERTIES()
68 // macros. The QML_DECLARE_PROPERTIES() macro is used to specify the properties, and the
69 // QML_DEFINE_PROPERTIES() macro to register the properties with the
70 // QQmlAccessorProperties singleton.
72 // A class with accessor properties must also add the Q_CLASSINFO("qt_HasQmlAccessors", "true")
73 // tag to its declaration. This is essential for QML to maintain internal consistency,
74 // and forgetting to do so will probably cause your application to qFatal() with a
75 // helpful reminder of this requirement.
77 // It is important that QML_DEFINE_PROPERTIES() has been called before QML ever sees
78 // the type with the accessor properties. As QML_DEFINE_PROPERTIES() is idempotent, it is
79 // recommended to call it in the type's constructor as well as when the type is registered
80 // as a QML element (if it ever is). QML_DEFINE_PROPERTIES() is a very cheap operation
81 // if registration has already occurred.
83 #define QML_DECLARE_PROPERTIES(type) \
84 static volatile bool qqml_accessor_properties_isregistered_ ## type = false; \
85 static QQmlAccessorProperties::Property qqml_accessor_properties_ ## type[] =
87 #define QML_DEFINE_PROPERTIES(type) \
89 if (!qqml_accessor_properties_isregistered_ ## type) { \
90 int count = sizeof(qqml_accessor_properties_ ## type) / \
91 sizeof(QQmlAccessorProperties::Property); \
92 QQmlAccessorProperties::registerProperties(&type::staticMetaObject, count, \
93 qqml_accessor_properties_ ## type);\
94 qqml_accessor_properties_isregistered_ ## type = true; \
98 #define QML_PRIVATE_ACCESSOR(clazz, cpptype, name, variable) \
99 static void clazz ## _ ## name ## Read(QObject *o, intptr_t, void *rv) \
101 clazz ## Private *d = clazz ## Private::get(static_cast<clazz *>(o)); \
102 *static_cast<cpptype *>(rv) = d->variable; \
105 #define QML_PROPERTY_NAME(name) #name, sizeof #name - 1
110 void (*read)(QObject *object, intptr_t property, void *output);
111 void (*notifier)(QObject *object, intptr_t property, QQmlNotifier **notifier);
114 namespace QQmlAccessorProperties {
117 unsigned int nameLength;
119 QQmlAccessors *accessors;
124 Properties(Property *, int);
126 bool operator==(const Properties &o) const {
127 return count == o.count && properties == o.properties;
130 inline Property *property(const char *name);
133 Property *properties;
137 Properties properties(const QMetaObject *);
138 void Q_QML_PRIVATE_EXPORT registerProperties(const QMetaObject *, int, Property *);
141 QQmlAccessorProperties::Property *
142 QQmlAccessorProperties::Properties::property(const char *name)
147 const unsigned int length = (unsigned int)strlen(name);
151 if (nameMask & (1 << qMin(31U, length - 1))) {
153 for (int ii = 0; ii < count; ++ii) {
154 if (properties[ii].nameLength == length && 0 == qstrcmp(name, properties[ii].name))
155 return &properties[ii];
163 QQmlAccessorProperties::Properties::Properties()
164 : count(0), properties(0), nameMask(0)
172 #endif // QQMLACCESSORS_P_H