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katie/src/core/kernel/qmetaobject.cpp
Ivailo Monev 4d671c30ee qNormalizeType() cleanup 
Signed-off-by: Ivailo Monev <xakepa10@laimg.moc>
2016-11-04 03:29:21 +00:00

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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
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** accordance with the commercial license agreement provided with the
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** information use the contact form at http://www.qt.io/contact-us.
**
** 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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
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**
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**
** 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
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****************************************************************************/
#include "qmetaobject.h"
#include "qmetatype.h"
#include "qobject.h"
#include <qcoreapplication.h>
#include <qcoreevent.h>
#include <qdatastream.h>
#include <qstringlist.h>
#include <qthread.h>
#include <qvarlengtharray.h>
#include <qvariant.h>
#include <qhash.h>
#include <qdebug.h>
#include <qsemaphore.h>
#include "qobject_p.h"
#include "qmetaobject_p.h"
#include <ctype.h>
QT_BEGIN_NAMESPACE
/*!
\class QMetaObject
\brief The QMetaObject class contains meta-information about Qt
objects.
\ingroup objectmodel
The Qt \l{Meta-Object System} in Qt is responsible for the
signals and slots inter-object communication mechanism, runtime
type information, and the Qt property system. A single
QMetaObject instance is created for each QObject subclass that is
used in an application, and this instance stores all the
meta-information for the QObject subclass. This object is
available as QObject::metaObject().
This class is not normally required for application programming,
but it is useful if you write meta-applications, such as scripting
engines or GUI builders.
The functions you are most likely to find useful are these:
\list
\o className() returns the name of a class.
\o superClass() returns the superclass's meta-object.
\o method() and methodCount() provide information
about a class's meta-methods (signals, slots and other
\l{Q_INVOKABLE}{invokable} member functions).
\o enumerator() and enumeratorCount() and provide information about
a class's enumerators.
\o propertyCount() and property() provide information about a
class's properties.
\o constructor() and constructorCount() provide information
about a class's meta-constructors.
\endlist
The index functions indexOfConstructor(), indexOfMethod(),
indexOfEnumerator(), and indexOfProperty() map names of constructors,
member functions, enumerators, or properties to indexes in the
meta-object. For example, Qt uses indexOfMethod() internally when you
connect a signal to a slot.
Classes can also have a list of \e{name}--\e{value} pairs of
additional class information, stored in QMetaClassInfo objects.
The number of pairs is returned by classInfoCount(), single pairs
are returned by classInfo(), and you can search for pairs with
indexOfClassInfo().
\sa QMetaClassInfo, QMetaEnum, QMetaMethod, QMetaProperty, QMetaType,
{Meta-Object System}
*/
/*!
\enum QMetaObject::Call
\internal
\value InvokeSlot
\value EmitSignal
\value ReadProperty
\value WriteProperty
\value ResetProperty
\value QueryPropertyDesignable
\value QueryPropertyScriptable
\value QueryPropertyStored
\value QueryPropertyEditable
\value QueryPropertyUser
\value CreateInstance
*/
/*!
\enum QMetaMethod::Access
This enum describes the access level of a method, following the conventions used in C++.
\value Private
\value Protected
\value Public
*/
static inline const QMetaObjectPrivate *priv(const uint* data)
{ return reinterpret_cast<const QMetaObjectPrivate*>(data); }
/*!
\since 4.5
Constructs a new instance of this class. You can pass up to ten arguments
(\a val0, \a val1, \a val2, \a val3, \a val4, \a val5, \a val6, \a val7,
\a val8, and \a val9) to the constructor. Returns the new object, or 0 if
no suitable constructor is available.
Note that only constructors that are declared with the Q_INVOKABLE
modifier are made available through the meta-object system.
\sa Q_ARG(), constructor()
*/
QObject *QMetaObject::newInstance(QGenericArgument val0,
QGenericArgument val1,
QGenericArgument val2,
QGenericArgument val3,
QGenericArgument val4,
QGenericArgument val5,
QGenericArgument val6,
QGenericArgument val7,
QGenericArgument val8,
QGenericArgument val9) const
{
QByteArray constructorName = className();
{
int idx = constructorName.lastIndexOf(':');
if (idx != -1)
constructorName.remove(0, idx+1); // remove qualified part
}
QVarLengthArray<char, 512> sig;
sig.append(constructorName.constData(), constructorName.length());
sig.append('(');
enum { MaximumParamCount = 10 };
const char *typeNames[] = {val0.name(), val1.name(), val2.name(), val3.name(), val4.name(),
val5.name(), val6.name(), val7.name(), val8.name(), val9.name()};
int paramCount;
for (paramCount = 0; paramCount < MaximumParamCount; ++paramCount) {
int len = qstrlen(typeNames[paramCount]);
if (len <= 0)
break;
sig.append(typeNames[paramCount], len);
sig.append(',');
}
if (paramCount == 0)
sig.append(')'); // no parameters
else
sig[sig.size() - 1] = ')';
sig.append('\0');
int idx = indexOfConstructor(sig.constData());
if (idx < 0) {
QByteArray norm = QMetaObject::normalizedSignature(sig.constData());
idx = indexOfConstructor(norm.constData());
}
if (idx < 0)
return Q_NULLPTR;
QVariant ret(QMetaType::QObjectStar, Q_NULLPTR);
void *param[] = {ret.data(), val0.data(), val1.data(), val2.data(), val3.data(), val4.data(),
val5.data(), val6.data(), val7.data(), val8.data(), val9.data()};
if (static_metacall(CreateInstance, idx, param) >= 0)
return Q_NULLPTR;
return *reinterpret_cast<QObject**>(param[0]);
}
/*!
\internal
*/
int QMetaObject::static_metacall(Call cl, int idx, void **argv) const
{
Q_ASSERT(priv(d.data)->revision >= 6);
if (!d.static_metacall)
return 0;
d.static_metacall(0, cl, idx, argv);
return -1;
}
/*!
\internal
*/
int QMetaObject::metacall(QObject *object, Call cl, int idx, void **argv)
{
if (QMetaObject *mo = object->d_ptr->metaObject)
return static_cast<QAbstractDynamicMetaObject*>(mo)->metaCall(cl, idx, argv);
else
return object->qt_metacall(cl, idx, argv);
}
/*!
\fn const char *QMetaObject::className() const
Returns the class name.
\sa superClass()
*/
/*!
\fn QMetaObject *QMetaObject::superClass() const
Returns the meta-object of the superclass, or 0 if there is no
such object.
\sa className()
*/
/*!
\internal
Returns \a obj if object \a obj inherits from this
meta-object; otherwise returns 0.
*/
QObject *QMetaObject::cast(QObject *obj) const
{
if (obj) {
const QMetaObject *m = obj->metaObject();
do {
if (m == this)
return obj;
} while ((m = m->d.superdata));
}
return Q_NULLPTR;
}
/*!
\internal
Returns \a obj if object \a obj inherits from this
meta-object; otherwise returns 0.
*/
const QObject *QMetaObject::cast(const QObject *obj) const
{
if (obj) {
const QMetaObject *m = obj->metaObject();
do {
if (m == this)
return obj;
} while ((m = m->d.superdata));
}
return Q_NULLPTR;
}
#ifndef QT_NO_TRANSLATION
/*!
\internal
*/
QString QMetaObject::tr(const char *s, const char *c, int n) const
{
return QCoreApplication::translate(d.stringdata, s, c, QCoreApplication::CodecForTr, n);
}
/*!
\internal
*/
QString QMetaObject::trUtf8(const char *s, const char *c, int n) const
{
return QCoreApplication::translate(d.stringdata, s, c, QCoreApplication::UnicodeUTF8, n);
}
#endif // QT_NO_TRANSLATION
/*!
Returns the method offset for this class; i.e. the index position
of this class's first member function.
The offset is the sum of all the methods in the class's
superclasses (which is always positive since QObject has the
deleteLater() slot and a destroyed() signal).
\sa method(), methodCount(), indexOfMethod()
*/
int QMetaObject::methodOffset() const
{
int offset = 0;
const QMetaObject *m = d.superdata;
while (m) {
offset += priv(m->d.data)->methodCount;
m = m->d.superdata;
}
return offset;
}
/*!
Returns the enumerator offset for this class; i.e. the index
position of this class's first enumerator.
If the class has no superclasses with enumerators, the offset is
0; otherwise the offset is the sum of all the enumerators in the
class's superclasses.
\sa enumerator(), enumeratorCount(), indexOfEnumerator()
*/
int QMetaObject::enumeratorOffset() const
{
int offset = 0;
const QMetaObject *m = d.superdata;
while (m) {
offset += priv(m->d.data)->enumeratorCount;
m = m->d.superdata;
}
return offset;
}
/*!
Returns the property offset for this class; i.e. the index
position of this class's first property.
The offset is the sum of all the properties in the class's
superclasses (which is always positive since QObject has the
name() property).
\sa property(), propertyCount(), indexOfProperty()
*/
int QMetaObject::propertyOffset() const
{
int offset = 0;
const QMetaObject *m = d.superdata;
while (m) {
offset += priv(m->d.data)->propertyCount;
m = m->d.superdata;
}
return offset;
}
/*!
Returns the class information offset for this class; i.e. the
index position of this class's first class information item.
If the class has no superclasses with class information, the
offset is 0; otherwise the offset is the sum of all the class
information items in the class's superclasses.
\sa classInfo(), classInfoCount(), indexOfClassInfo()
*/
int QMetaObject::classInfoOffset() const
{
int offset = 0;
const QMetaObject *m = d.superdata;
while (m) {
offset += priv(m->d.data)->classInfoCount;
m = m->d.superdata;
}
return offset;
}
/*!
\since 4.5
Returns the number of constructors in this class.
\sa constructor(), indexOfConstructor()
*/
int QMetaObject::constructorCount() const
{
Q_ASSERT(priv(d.data)->revision >= 6);
return priv(d.data)->constructorCount;
}
/*!
Returns the number of methods known to the meta-object system in this class,
including the number of properties provided by each base class. These
include signals and slots as well as member functions declared with the
Q_INVOKABLE macro.
Use code like the following to obtain a QStringList containing the methods
specific to a given class:
\snippet doc/src/snippets/code/src_corelib_kernel_qmetaobject.cpp methodCount
\sa method(), methodOffset(), indexOfMethod()
*/
int QMetaObject::methodCount() const
{
int n = priv(d.data)->methodCount;
const QMetaObject *m = d.superdata;
while (m) {
n += priv(m->d.data)->methodCount;
m = m->d.superdata;
}
return n;
}
/*!
Returns the number of enumerators in this class.
\sa enumerator(), enumeratorOffset(), indexOfEnumerator()
*/
int QMetaObject::enumeratorCount() const
{
int n = priv(d.data)->enumeratorCount;
const QMetaObject *m = d.superdata;
while (m) {
n += priv(m->d.data)->enumeratorCount;
m = m->d.superdata;
}
return n;
}
/*!
Returns the number of properties in this class, including the number of
properties provided by each base class.
Use code like the following to obtain a QStringList containing the properties
specific to a given class:
\snippet doc/src/snippets/code/src_corelib_kernel_qmetaobject.cpp propertyCount
\sa property(), propertyOffset(), indexOfProperty()
*/
int QMetaObject::propertyCount() const
{
int n = priv(d.data)->propertyCount;
const QMetaObject *m = d.superdata;
while (m) {
n += priv(m->d.data)->propertyCount;
m = m->d.superdata;
}
return n;
}
/*!
Returns the number of items of class information in this class.
\sa classInfo(), classInfoOffset(), indexOfClassInfo()
*/
int QMetaObject::classInfoCount() const
{
int n = priv(d.data)->classInfoCount;
const QMetaObject *m = d.superdata;
while (m) {
n += priv(m->d.data)->classInfoCount;
m = m->d.superdata;
}
return n;
}
/** \internal
* helper function for indexOf{Method,Slot,Signal}, returns the relative index of the method within
* the baseObject
* \a MethodType might be MethodSignal or MethodSlot, or 0 to match everything.
*/
template<int MethodType>
static inline int indexOfMethodRelative(const QMetaObject **baseObject,
const char *method)
{
for (const QMetaObject *m = *baseObject; m; m = m->d.superdata) {
Q_ASSERT(priv(m->d.data)->revision >= 6);
int i = (MethodType == MethodSignal)
? (priv(m->d.data)->signalCount - 1) : (priv(m->d.data)->methodCount - 1);
const int end = (MethodType == MethodSlot) ? (priv(m->d.data)->signalCount) : 0;
for (; i >= end; --i) {
const char *stringdata = m->d.stringdata + m->d.data[priv(m->d.data)->methodData + 5*i];
if (method[0] == stringdata[0] && strcmp(method + 1, stringdata + 1) == 0) {
*baseObject = m;
return i;
}
}
}
return -1;
}
/*!
\since 4.5
Finds \a constructor and returns its index; otherwise returns -1.
Note that the \a constructor has to be in normalized form, as returned
by normalizedSignature().
\sa constructor(), constructorCount(), normalizedSignature()
*/
int QMetaObject::indexOfConstructor(const char *constructor) const
{
Q_ASSERT(priv(d.data)->revision >= 6);
for (int i = priv(d.data)->constructorCount-1; i >= 0; --i) {
const char *data = d.stringdata + d.data[priv(d.data)->constructorData + 5*i];
if (data[0] == constructor[0] && strcmp(constructor + 1, data + 1) == 0) {
return i;
}
}
return -1;
}
/*!
Finds \a method and returns its index; otherwise returns -1.
Note that the \a method has to be in normalized form, as returned
by normalizedSignature().
\sa method(), methodCount(), methodOffset(), normalizedSignature()
*/
int QMetaObject::indexOfMethod(const char *method) const
{
const QMetaObject *m = this;
int i = indexOfMethodRelative<0>(&m, method);
if (i >= 0)
i += m->methodOffset();
return i;
}
/*!
Finds \a signal and returns its index; otherwise returns -1.
This is the same as indexOfMethod(), except that it will return
-1 if the method exists but isn't a signal.
Note that the \a signal has to be in normalized form, as returned
by normalizedSignature().
\sa indexOfMethod(), normalizedSignature(), method(), methodCount(), methodOffset()
*/
int QMetaObject::indexOfSignal(const char *signal) const
{
const QMetaObject *m = this;
int i = QMetaObjectPrivate::indexOfSignalRelative(&m, signal);
if (i >= 0)
i += m->methodOffset();
return i;
}
/*! \internal
Same as QMetaObject::indexOfSignal, but the result is the local offset to the base object.
\a baseObject will be adjusted to the enclosing QMetaObject, or 0 if the signal is not found
*/
int QMetaObjectPrivate::indexOfSignalRelative(const QMetaObject **baseObject,
const char *signal)
{
int i = indexOfMethodRelative<MethodSignal>(baseObject, signal);
#ifndef QT_NO_DEBUG
const QMetaObject *m = *baseObject;
if (i >= 0 && m && m->d.superdata) {
int conflict = m->d.superdata->indexOfMethod(signal);
if (conflict >= 0)
qWarning("QMetaObject::indexOfSignal: signal %s from %s redefined in %s",
signal, m->d.superdata->d.stringdata, m->d.stringdata);
}
#endif
return i;
}
/*!
Finds \a slot and returns its index; otherwise returns -1.
This is the same as indexOfMethod(), except that it will return
-1 if the method exists but isn't a slot.
\sa indexOfMethod(), method(), methodCount(), methodOffset()
*/
int QMetaObject::indexOfSlot(const char *slot) const
{
const QMetaObject *m = this;
int i = QMetaObjectPrivate::indexOfSlotRelative(&m, slot);
if (i >= 0)
i += m->methodOffset();
return i;
}
// same as indexOfSignalRelative but for slots.
int QMetaObjectPrivate::indexOfSlotRelative(const QMetaObject **m,
const char *slot)
{
return indexOfMethodRelative<MethodSlot>(m, slot);
}
static const QMetaObject *QMetaObject_findMetaObject(const QMetaObject *self, const char *name)
{
while (self) {
if (strcmp(self->d.stringdata, name) == 0)
return self;
if (self->d.relatedMetaObjects) {
Q_ASSERT(priv(self->d.data)->revision >= 6);
#ifdef Q_NO_DATA_RELOCATION
const QMetaObjectAccessor *e = self->d.relatedMetaObjects;
#else
const QMetaObject **e = self->d.relatedMetaObjects;
#endif
if (e) {
while (*e) {
#ifdef Q_NO_DATA_RELOCATION
if (const QMetaObject *m = QMetaObject_findMetaObject(&((*e)()), name))
#else
if (const QMetaObject *m = QMetaObject_findMetaObject((*e), name))
#endif
return m;
++e;
}
}
}
self = self->d.superdata;
}
return self;
}
/*!
Finds enumerator \a name and returns its index; otherwise returns
-1.
\sa enumerator(), enumeratorCount(), enumeratorOffset()
*/
int QMetaObject::indexOfEnumerator(const char *name) const
{
const QMetaObject *m = this;
while (m) {
const QMetaObjectPrivate *d = priv(m->d.data);
for (int i = d->enumeratorCount - 1; i >= 0; --i) {
const char *prop = m->d.stringdata + m->d.data[d->enumeratorData + 4*i];
if (name[0] == prop[0] && strcmp(name + 1, prop + 1) == 0) {
i += m->enumeratorOffset();
return i;
}
}
m = m->d.superdata;
}
return -1;
}
/*!
Finds property \a name and returns its index; otherwise returns
-1.
\sa property(), propertyCount(), propertyOffset()
*/
int QMetaObject::indexOfProperty(const char *name) const
{
const QMetaObject *m = this;
while (m) {
const QMetaObjectPrivate *d = priv(m->d.data);
for (int i = d->propertyCount-1; i >= 0; --i) {
const char *prop = m->d.stringdata + m->d.data[d->propertyData + 3*i];
if (name[0] == prop[0] && strcmp(name + 1, prop + 1) == 0) {
i += m->propertyOffset();
return i;
}
}
m = m->d.superdata;
}
Q_ASSERT(priv(this->d.data)->revision >= 6);
if (priv(this->d.data)->flags & DynamicMetaObject) {
QAbstractDynamicMetaObject *me =
const_cast<QAbstractDynamicMetaObject *>(static_cast<const QAbstractDynamicMetaObject *>(this));
return me->createProperty(name, Q_NULLPTR);
}
return -1;
}
/*!
Finds class information item \a name and returns its index;
otherwise returns -1.
\sa classInfo(), classInfoCount(), classInfoOffset()
*/
int QMetaObject::indexOfClassInfo(const char *name) const
{
int i = -1;
const QMetaObject *m = this;
while (m && i < 0) {
for (i = priv(m->d.data)->classInfoCount-1; i >= 0; --i)
if (strcmp(name, m->d.stringdata
+ m->d.data[priv(m->d.data)->classInfoData + 2*i]) == 0) {
i += m->classInfoOffset();
break;
}
m = m->d.superdata;
}
return i;
}
/*!
\since 4.5
Returns the meta-data for the constructor with the given \a index.
\sa constructorCount(), newInstance()
*/
QMetaMethod QMetaObject::constructor(int index) const
{
Q_ASSERT(priv(d.data)->revision >= 6);
int i = index;
QMetaMethod result;
if (i >= 0 && i < priv(d.data)->constructorCount) {
result.mobj = this;
result.handle = priv(d.data)->constructorData + 5*i;
}
return result;
}
/*!
Returns the meta-data for the method with the given \a index.
\sa methodCount(), methodOffset(), indexOfMethod()
*/
QMetaMethod QMetaObject::method(int index) const
{
int i = index;
i -= methodOffset();
if (i < 0 && d.superdata)
return d.superdata->method(index);
QMetaMethod result;
if (i >= 0 && i < priv(d.data)->methodCount) {
result.mobj = this;
result.handle = priv(d.data)->methodData + 5*i;
}
return result;
}
/*!
Returns the meta-data for the enumerator with the given \a index.
\sa enumeratorCount(), enumeratorOffset(), indexOfEnumerator()
*/
QMetaEnum QMetaObject::enumerator(int index) const
{
int i = index;
i -= enumeratorOffset();
if (i < 0 && d.superdata)
return d.superdata->enumerator(index);
QMetaEnum result;
if (i >= 0 && i < priv(d.data)->enumeratorCount) {
result.mobj = this;
result.handle = priv(d.data)->enumeratorData + 4*i;
}
return result;
}
/*!
Returns the meta-data for the property with the given \a index.
If no such property exists, a null QMetaProperty is returned.
\sa propertyCount(), propertyOffset(), indexOfProperty()
*/
QMetaProperty QMetaObject::property(int index) const
{
int i = index;
i -= propertyOffset();
if (i < 0 && d.superdata)
return d.superdata->property(index);
QMetaProperty result;
if (i >= 0 && i < priv(d.data)->propertyCount) {
int handle = priv(d.data)->propertyData + 3*i;
int flags = d.data[handle + 2];
const char *type = d.stringdata + d.data[handle + 1];
result.mobj = this;
result.handle = handle;
result.idx = i;
if (flags & EnumOrFlag) {
result.menum = enumerator(indexOfEnumerator(type));
if (!result.menum.isValid()) {
QByteArray enum_name = type;
QByteArray scope_name = d.stringdata;
int s = enum_name.lastIndexOf("::");
if (s > 0) {
scope_name = enum_name.left(s);
enum_name = enum_name.mid(s + 2);
}
const QMetaObject *scope = Q_NULLPTR;
if (scope_name == "Qt")
scope = &QObject::staticQtMetaObject;
else
scope = QMetaObject_findMetaObject(this, scope_name);
if (scope)
result.menum = scope->enumerator(scope->indexOfEnumerator(enum_name));
}
}
}
return result;
}
/*!
\since 4.2
Returns the property that has the \c USER flag set to true.
\sa QMetaProperty::isUser()
*/
QMetaProperty QMetaObject::userProperty() const
{
const int propCount = propertyCount();
for (int i = propCount - 1; i >= 0; --i) {
const QMetaProperty prop = property(i);
if (prop.isUser())
return prop;
}
return QMetaProperty();
}
/*!
Returns the meta-data for the item of class information with the
given \a index.
Example:
\snippet doc/src/snippets/code/src_corelib_kernel_qmetaobject.cpp 0
\sa classInfoCount(), classInfoOffset(), indexOfClassInfo()
*/
QMetaClassInfo QMetaObject::classInfo(int index) const
{
int i = index;
i -= classInfoOffset();
if (i < 0 && d.superdata)
return d.superdata->classInfo(index);
QMetaClassInfo result;
if (i >= 0 && i < priv(d.data)->classInfoCount) {
result.mobj = this;
result.handle = priv(d.data)->classInfoData + 2*i;
}
return result;
}
/*!
Returns true if the \a signal and \a method arguments are
compatible; otherwise returns false.
Both \a signal and \a method are expected to be normalized.
\sa normalizedSignature()
*/
bool QMetaObject::checkConnectArgs(const char *signal, const char *method)
{
const char *s1 = signal;
const char *s2 = method;
while (*s1++ != '(') { } // scan to first '('
while (*s2++ != '(') { }
if (*s2 == ')' || qstrcmp(s1,s2) == 0) // method has no args or
return true; // exact match
int s1len = qstrlen(s1);
int s2len = qstrlen(s2);
if (s2len < s1len && strncmp(s1,s2,s2len-1)==0 && s1[s2len-1]==',')
return true; // method has less args
return false;
}
static void qRemoveWhitespace(const char *s, char *d)
{
char last = 0;
while (*s && is_space(*s))
s++;
while (*s) {
while (*s && !is_space(*s))
last = *d++ = *s++;
while (*s && is_space(*s))
s++;
if (*s && ((is_ident_char(*s) && is_ident_char(last))
|| ((*s == ':') && (last == '<')))) {
last = *d++ = ' ';
}
}
*d = '\0';
}
static char *qNormalizeType(char *d, QByteArray &result)
{
const char *t = d;
while (*d && (*d != ',' && *d != ')')) {
++d;
}
if (strncmp("void", t, d - t) != 0)
result += normalizeTypeInternal(t, d);
return d;
}
/*!
\since 4.2
Normalizes a \a type.
See QMetaObject::normalizedSignature() for a description on how
Qt normalizes.
Example:
\snippet doc/src/snippets/code/src_corelib_kernel_qmetaobject.cpp 1
\sa normalizedSignature()
*/
QByteArray QMetaObject::normalizedType(const char *type)
{
QByteArray result;
if (!type || !*type)
return result;
QVarLengthArray<char> stackbuf(qstrlen(type) + 1);
qRemoveWhitespace(type, stackbuf.data());
qNormalizeType(stackbuf.data(), result);
return result;
}
/*!
Normalizes the signature of the given \a method.
Qt uses normalized signatures to decide whether two given signals
and slots are compatible. Normalization reduces whitespace to a
minimum, moves 'const' to the front where appropriate, removes
'const' from value types and replaces const references with
values.
\sa checkConnectArgs(), normalizedType()
*/
QByteArray QMetaObject::normalizedSignature(const char *method)
{
QByteArray result;
if (!method || !*method)
return result;
int len = int(strlen(method));
QVarLengthArray<char> stackbuf(len + 1);
char *d = stackbuf.data();
qRemoveWhitespace(method, d);
result.reserve(len);
int argdepth = 0;
while (*d) {
if (argdepth == 1) {
d = qNormalizeType(d, result);
if (!*d) //most likely an invalid signature.
break;
}
if (*d == '(')
++argdepth;
if (*d == ')')
--argdepth;
result += *d++;
}
return result;
}
enum { MaximumParamCount = 11 }; // up to 10 arguments + 1 return value
/*!
Invokes the \a member (a signal or a slot name) on the object \a
obj. Returns true if the member could be invoked. Returns false
if there is no such member or the parameters did not match.
The invocation can be either synchronous or asynchronous,
depending on \a type:
\list
\o If \a type is Qt::DirectConnection, the member will be invoked immediately.
\o If \a type is Qt::QueuedConnection,
a QEvent will be sent and the member is invoked as soon as the application
enters the main event loop.
\o If \a type is Qt::BlockingQueuedConnection, the method will be invoked in
the same way as for Qt::QueuedConnection, except that the current thread
will block until the event is delivered. Using this connection type to
communicate between objects in the same thread will lead to deadlocks.
\o If \a type is Qt::AutoConnection, the member is invoked
synchronously if \a obj lives in the same thread as the
caller; otherwise it will invoke the member asynchronously.
\endlist
The return value of the \a member function call is placed in \a
ret. If the invocation is asynchronous, the return value cannot
be evaluated. You can pass up to ten arguments (\a val0, \a val1,
\a val2, \a val3, \a val4, \a val5, \a val6, \a val7, \a val8,
and \a val9) to the \a member function.
QGenericArgument and QGenericReturnArgument are internal
helper classes. Because signals and slots can be dynamically
invoked, you must enclose the arguments using the Q_ARG() and
Q_RETURN_ARG() macros. Q_ARG() takes a type name and a
const reference of that type; Q_RETURN_ARG() takes a type name
and a non-const reference.
You only need to pass the name of the signal or slot to this function,
not the entire signature. For example, to asynchronously invoke
the \l{QPushButton::animateClick()}{animateClick()} slot on a
QPushButton, use the following code:
\snippet doc/src/snippets/code/src_corelib_kernel_qmetaobject.cpp 2
With asynchronous method invocations, the parameters must be of
types that are known to Qt's meta-object system, because Qt needs
to copy the arguments to store them in an event behind the
scenes. If you try to use a queued connection and get the error
message
\snippet doc/src/snippets/code/src_corelib_kernel_qmetaobject.cpp 3
call qRegisterMetaType() to register the data type before you
call invokeMethod().
To synchronously invoke the \c compute(QString, int, double) slot on
some arbitrary object \c obj retrieve its return value:
\snippet doc/src/snippets/code/src_corelib_kernel_qmetaobject.cpp 4
If the "compute" slot does not take exactly one QString, one int
and one double in the specified order, the call will fail.
\sa Q_ARG(), Q_RETURN_ARG(), qRegisterMetaType(), QMetaMethod::invoke()
*/
bool QMetaObject::invokeMethod(QObject *obj,
const char *member,
Qt::ConnectionType type,
QGenericReturnArgument ret,
QGenericArgument val0,
QGenericArgument val1,
QGenericArgument val2,
QGenericArgument val3,
QGenericArgument val4,
QGenericArgument val5,
QGenericArgument val6,
QGenericArgument val7,
QGenericArgument val8,
QGenericArgument val9)
{
if (!obj)
return false;
QVarLengthArray<char, 512> sig;
int len = qstrlen(member);
if (len <= 0)
return false;
sig.append(member, len);
sig.append('(');
const char *typeNames[] = {ret.name(), val0.name(), val1.name(), val2.name(), val3.name(),
val4.name(), val5.name(), val6.name(), val7.name(), val8.name(),
val9.name()};
int paramCount;
for (paramCount = 1; paramCount < MaximumParamCount; ++paramCount) {
len = qstrlen(typeNames[paramCount]);
if (len <= 0)
break;
sig.append(typeNames[paramCount], len);
sig.append(',');
}
if (paramCount == 1)
sig.append(')'); // no parameters
else
sig[sig.size() - 1] = ')';
sig.append('\0');
int idx = obj->metaObject()->indexOfMethod(sig.constData());
if (idx < 0) {
QByteArray norm = QMetaObject::normalizedSignature(sig.constData());
idx = obj->metaObject()->indexOfMethod(norm.constData());
}
if (idx < 0 || idx >= obj->metaObject()->methodCount()) {
qWarning("QMetaObject::invokeMethod: No such method %s::%s",
obj->metaObject()->className(), sig.constData());
return false;
}
QMetaMethod method = obj->metaObject()->method(idx);
return method.invoke(obj, type, ret,
val0, val1, val2, val3, val4, val5, val6, val7, val8, val9);
}
/*! \fn bool QMetaObject::invokeMethod(QObject *obj, const char *member,
QGenericReturnArgument ret,
QGenericArgument val0 = QGenericArgument(),
QGenericArgument val1 = QGenericArgument(),
QGenericArgument val2 = QGenericArgument(),
QGenericArgument val3 = QGenericArgument(),
QGenericArgument val4 = QGenericArgument(),
QGenericArgument val5 = QGenericArgument(),
QGenericArgument val6 = QGenericArgument(),
QGenericArgument val7 = QGenericArgument(),
QGenericArgument val8 = QGenericArgument(),
QGenericArgument val9 = QGenericArgument());
\overload invokeMethod()
This overload always invokes the member using the connection type Qt::AutoConnection.
*/
/*! \fn bool QMetaObject::invokeMethod(QObject *obj, const char *member,
Qt::ConnectionType type,
QGenericArgument val0 = QGenericArgument(),
QGenericArgument val1 = QGenericArgument(),
QGenericArgument val2 = QGenericArgument(),
QGenericArgument val3 = QGenericArgument(),
QGenericArgument val4 = QGenericArgument(),
QGenericArgument val5 = QGenericArgument(),
QGenericArgument val6 = QGenericArgument(),
QGenericArgument val7 = QGenericArgument(),
QGenericArgument val8 = QGenericArgument(),
QGenericArgument val9 = QGenericArgument())
\overload invokeMethod()
This overload can be used if the return value of the member is of no interest.
*/
/*!
\fn bool QMetaObject::invokeMethod(QObject *obj, const char *member,
QGenericArgument val0 = QGenericArgument(),
QGenericArgument val1 = QGenericArgument(),
QGenericArgument val2 = QGenericArgument(),
QGenericArgument val3 = QGenericArgument(),
QGenericArgument val4 = QGenericArgument(),
QGenericArgument val5 = QGenericArgument(),
QGenericArgument val6 = QGenericArgument(),
QGenericArgument val7 = QGenericArgument(),
QGenericArgument val8 = QGenericArgument(),
QGenericArgument val9 = QGenericArgument())
\overload invokeMethod()
This overload invokes the member using the connection type Qt::AutoConnection and
ignores return values.
*/
/*!
\class QMetaMethod
\brief The QMetaMethod class provides meta-data about a member
function.
\ingroup objectmodel
A QMetaMethod has a methodType(), a signature(), a list of
parameterTypes() and parameterNames(), a return typeName(), a
tag(), and an access() specifier. You can use invoke() to invoke
the method on an arbitrary QObject.
A method will only be registered with the meta-object system if it
is a slot, a signal, or declared with the Q_INVOKABLE macro.
Constructors can also be registered with Q_INVOKABLE.
\sa QMetaObject, QMetaEnum, QMetaProperty, {Qt's Property System}
*/
/*!
\enum QMetaMethod::Attributes
\internal
\value Cloned
\value Scriptable
*/
/*!
\fn const QMetaObject *QMetaMethod::enclosingMetaObject() const
\internal
*/
/*!
\enum QMetaMethod::MethodType
\value Method The function is a plain member function.
\value Signal The function is a signal.
\value Slot The function is a slot.
\value Constructor The function is a constructor.
*/
/*!
\fn QMetaMethod::QMetaMethod()
\internal
*/
/*!
Returns the signature of this method (e.g.,
\c{setValue(double)}).
\sa parameterTypes(), parameterNames()
*/
const char *QMetaMethod::signature() const
{
if (!mobj)
return Q_NULLPTR;
return mobj->d.stringdata + mobj->d.data[handle];
}
/*!
Returns a list of parameter types.
\sa parameterNames(), signature()
*/
QList<QByteArray> QMetaMethod::parameterTypes() const
{
QList<QByteArray> list;
if (!mobj)
return list;
const char *signature = mobj->d.stringdata + mobj->d.data[handle];
while (*signature && *signature != '(')
++signature;
while (*signature && *signature != ')' && *++signature != ')') {
const char *begin = signature;
int level = 0;
while (*signature && (level > 0 || *signature != ',') && *signature != ')') {
if (*signature == '<')
++level;
else if (*signature == '>')
--level;
++signature;
}
list += QByteArray(begin, signature - begin);
}
return list;
}
/*!
Returns a list of parameter names.
\sa parameterTypes(), signature()
*/
QList<QByteArray> QMetaMethod::parameterNames() const
{
QList<QByteArray> list;
if (!mobj)
return list;
const char *names = mobj->d.stringdata + mobj->d.data[handle + 1];
if (*names == 0) {
// do we have one or zero arguments?
const char *signature = mobj->d.stringdata + mobj->d.data[handle];
while (*signature && *signature != '(')
++signature;
if (*++signature != ')')
list += QByteArray();
} else {
--names;
do {
const char *begin = ++names;
while (*names && *names != ',')
++names;
list += QByteArray(begin, names - begin);
} while (*names);
}
return list;
}
/*!
Returns the return type of this method, or an empty string if the
return type is \e void.
*/
const char *QMetaMethod::typeName() const
{
if (!mobj)
return Q_NULLPTR;
return mobj->d.stringdata + mobj->d.data[handle + 2];
}
/*!
Returns the tag associated with this method.
Tags are special macros recognized by \c moc that make it
possible to add extra information about a method.
Tag information can be added in the following
way in the function declaration:
\code
#define THISISTESTTAG // tag text
...
private slots:
THISISTESTTAG void testFunc();
\endcode
and the information can be accessed by using:
\code
MainWindow win;
win.show();
int functionIndex = win.metaObject()->indexOfSlot("testFunc()");
QMetaMethod mm = metaObject()->method(functionIndex);
qDebug() << mm.tag(); // prints THISISTESTTAG
\endcode
For the moment,
\c moc doesn't support any special tags.
*/
const char *QMetaMethod::tag() const
{
if (!mobj)
return Q_NULLPTR;
return mobj->d.stringdata + mobj->d.data[handle + 3];
}
/*! \internal */
int QMetaMethod::attributes() const
{
if (!mobj)
return 0;
return ((mobj->d.data[handle + 4])>>4);
}
/*!
\since 4.6
Returns this method's index.
*/
int QMetaMethod::methodIndex() const
{
if (!mobj)
return -1;
return ((handle - priv(mobj->d.data)->methodData) / 5) + mobj->methodOffset();
}
/*!
\internal
Returns the method revision if one was
specified by Q_REVISION, otherwise returns 0.
*/
int QMetaMethod::revision() const
{
if (!mobj)
return 0;
if ((QMetaMethod::Access)(mobj->d.data[handle + 4] & MethodRevisioned)) {
int offset = priv(mobj->d.data)->methodData
+ priv(mobj->d.data)->methodCount * 5
+ (handle - priv(mobj->d.data)->methodData) / 5;
return mobj->d.data[offset];
}
return 0;
}
/*!
Returns the access specification of this method (private,
protected, or public).
Signals are always protected, meaning that you can only emit them
from the class or from a subclass.
\sa methodType()
*/
QMetaMethod::Access QMetaMethod::access() const
{
if (!mobj)
return Private;
return (QMetaMethod::Access)(mobj->d.data[handle + 4] & AccessMask);
}
/*!
Returns the type of this method (signal, slot, or method).
\sa access()
*/
QMetaMethod::MethodType QMetaMethod::methodType() const
{
if (!mobj)
return QMetaMethod::Method;
return (QMetaMethod::MethodType)((mobj->d.data[handle + 4] & MethodTypeMask)>>2);
}
/*!
Invokes this method on the object \a object. Returns true if the member could be invoked.
Returns false if there is no such member or the parameters did not match.
The invocation can be either synchronous or asynchronous, depending on the
\a connectionType:
\list
\o If \a connectionType is Qt::DirectConnection, the member will be invoked immediately.
\o If \a connectionType is Qt::QueuedConnection,
a QEvent will be posted and the member is invoked as soon as the application
enters the main event loop.
\o If \a connectionType is Qt::AutoConnection, the member is invoked
synchronously if \a object lives in the same thread as the
caller; otherwise it will invoke the member asynchronously.
\endlist
The return value of this method call is placed in \a
returnValue. If the invocation is asynchronous, the return value cannot
be evaluated. You can pass up to ten arguments (\a val0, \a val1,
\a val2, \a val3, \a val4, \a val5, \a val6, \a val7, \a val8,
and \a val9) to this method call.
QGenericArgument and QGenericReturnArgument are internal
helper classes. Because signals and slots can be dynamically
invoked, you must enclose the arguments using the Q_ARG() and
Q_RETURN_ARG() macros. Q_ARG() takes a type name and a
const reference of that type; Q_RETURN_ARG() takes a type name
and a non-const reference.
To asynchronously invoke the
\l{QPushButton::animateClick()}{animateClick()} slot on a
QPushButton:
\snippet doc/src/snippets/code/src_corelib_kernel_qmetaobject.cpp 6
With asynchronous method invocations, the parameters must be of
types that are known to Qt's meta-object system, because Qt needs
to copy the arguments to store them in an event behind the
scenes. If you try to use a queued connection and get the error
message
\snippet doc/src/snippets/code/src_corelib_kernel_qmetaobject.cpp 7
call qRegisterMetaType() to register the data type before you
call QMetaMethod::invoke().
To synchronously invoke the \c compute(QString, int, double) slot on
some arbitrary object \c obj retrieve its return value:
\snippet doc/src/snippets/code/src_corelib_kernel_qmetaobject.cpp 8
QMetaObject::normalizedSignature() is used here to ensure that the format
of the signature is what invoke() expects. E.g. extra whitespace is
removed.
If the "compute" slot does not take exactly one QString, one int
and one double in the specified order, the call will fail.
\warning this method will not test the validity of the arguments: \a object
must be an instance of the class of the QMetaObject of which this QMetaMethod
has been constructed with. The arguments must have the same type as the ones
expected by the method, else, the behaviour is undefined.
\sa Q_ARG(), Q_RETURN_ARG(), qRegisterMetaType(), QMetaObject::invokeMethod()
*/
bool QMetaMethod::invoke(QObject *object,
Qt::ConnectionType connectionType,
QGenericReturnArgument returnValue,
QGenericArgument val0,
QGenericArgument val1,
QGenericArgument val2,
QGenericArgument val3,
QGenericArgument val4,
QGenericArgument val5,
QGenericArgument val6,
QGenericArgument val7,
QGenericArgument val8,
QGenericArgument val9) const
{
if (!object || !mobj)
return false;
Q_ASSERT(mobj->cast(object));
// check return type
if (returnValue.data()) {
const char *retType = typeName();
if (qstrcmp(returnValue.name(), retType) != 0) {
// normalize the return value as well
// the trick here is to make a function signature out of the return type
// so that we can call normalizedSignature() and avoid duplicating code
QByteArray unnormalized;
int len = qstrlen(returnValue.name());
unnormalized.reserve(len + 3);
unnormalized = "_("; // the function is called "_"
unnormalized.append(returnValue.name());
unnormalized.append(')');
QByteArray normalized = QMetaObject::normalizedSignature(unnormalized.constData());
normalized.truncate(normalized.length() - 1); // drop the ending ')'
if (qstrcmp(normalized.constData() + 2, retType) != 0)
return false;
}
}
// check argument count (we don't allow invoking a method if given too few arguments)
const char *typeNames[] = {
returnValue.name(),
val0.name(),
val1.name(),
val2.name(),
val3.name(),
val4.name(),
val5.name(),
val6.name(),
val7.name(),
val8.name(),
val9.name()
};
int paramCount;
for (paramCount = 1; paramCount < MaximumParamCount; ++paramCount) {
if (qstrlen(typeNames[paramCount]) <= 0)
break;
}
int metaMethodArgumentCount = 0;
{
// based on QMetaObject::parameterNames()
const char *names = mobj->d.stringdata + mobj->d.data[handle + 1];
if (*names == 0) {
// do we have one or zero arguments?
const char *signature = mobj->d.stringdata + mobj->d.data[handle];
while (*signature && *signature != '(')
++signature;
if (*++signature != ')')
++metaMethodArgumentCount;
} else {
--names;
do {
++names;
while (*names && *names != ',')
++names;
++metaMethodArgumentCount;
} while (*names);
}
}
if (paramCount <= metaMethodArgumentCount)
return false;
// check connection type
QThread *currentThread = QThread::currentThread();
QThread *objectThread = object->thread();
if (connectionType == Qt::AutoConnection) {
connectionType = currentThread == objectThread
? Qt::DirectConnection
: Qt::QueuedConnection;
}
#ifdef QT_NO_THREAD
if (connectionType == Qt::BlockingQueuedConnection) {
connectionType = Qt::DirectConnection;
}
#endif
// invoke!
void *param[] = {
returnValue.data(),
val0.data(),
val1.data(),
val2.data(),
val3.data(),
val4.data(),
val5.data(),
val6.data(),
val7.data(),
val8.data(),
val9.data()
};
// recompute the methodIndex by reversing the arithmetic in QMetaObject::property()
int idx_relative = ((handle - priv(mobj->d.data)->methodData) / 5);
int idx_offset = mobj->methodOffset();
Q_ASSERT(QMetaObjectPrivate::get(mobj)->revision >= 6);
QObjectPrivate::StaticMetaCallFunction callFunction = mobj->d.static_metacall;
if (connectionType == Qt::DirectConnection) {
if (callFunction) {
callFunction(object, QMetaObject::InvokeMetaMethod, idx_relative, param);
return true;
} else {
return QMetaObject::metacall(object, QMetaObject::InvokeMetaMethod, idx_relative + idx_offset, param) < 0;
}
} else if (connectionType == Qt::QueuedConnection) {
if (returnValue.data()) {
qWarning("QMetaMethod::invoke: Unable to invoke methods with return values in "
"queued connections");
return false;
}
int nargs = 1; // include return type
void **args = (void **) malloc(paramCount * sizeof(void *));
Q_CHECK_PTR(args);
int *types = (int *) malloc(paramCount * sizeof(int));
Q_CHECK_PTR(types);
types[0] = 0; // return type
args[0] = Q_NULLPTR;
for (int i = 1; i < paramCount; ++i) {
types[i] = QMetaType::type(typeNames[i]);
if (types[i]) {
args[i] = QMetaType::construct(types[i], param[i]);
++nargs;
} else if (param[i]) {
qWarning("QMetaMethod::invoke: Unable to handle unregistered datatype '%s'",
typeNames[i]);
for (int x = 1; x < i; ++x) {
if (types[x] && args[x])
QMetaType::destroy(types[x], args[x]);
}
free(types);
free(args);
return false;
}
}
QCoreApplication::postEvent(object, new QMetaCallEvent(idx_offset, idx_relative, callFunction,
0, -1, nargs, types, args));
} else { // blocking queued connection
#ifndef QT_NO_THREAD
if (currentThread == objectThread) {
qWarning("QMetaMethod::invoke: Dead lock detected in "
"BlockingQueuedConnection: Receiver is %s(%p)",
mobj->className(), object);
}
QSemaphore semaphore;
QCoreApplication::postEvent(object, new QMetaCallEvent(idx_offset, idx_relative, callFunction,
0, -1, 0, 0, param, &semaphore));
semaphore.acquire();
#endif // QT_NO_THREAD
}
return true;
}
/*! \fn bool QMetaMethod::invoke(QObject *object,
QGenericReturnArgument returnValue,
QGenericArgument val0 = QGenericArgument(),
QGenericArgument val1 = QGenericArgument(),
QGenericArgument val2 = QGenericArgument(),
QGenericArgument val3 = QGenericArgument(),
QGenericArgument val4 = QGenericArgument(),
QGenericArgument val5 = QGenericArgument(),
QGenericArgument val6 = QGenericArgument(),
QGenericArgument val7 = QGenericArgument(),
QGenericArgument val8 = QGenericArgument(),
QGenericArgument val9 = QGenericArgument()) const
\overload invoke()
This overload always invokes this method using the connection type Qt::AutoConnection.
*/
/*! \fn bool QMetaMethod::invoke(QObject *object,
Qt::ConnectionType connectionType,
QGenericArgument val0 = QGenericArgument(),
QGenericArgument val1 = QGenericArgument(),
QGenericArgument val2 = QGenericArgument(),
QGenericArgument val3 = QGenericArgument(),
QGenericArgument val4 = QGenericArgument(),
QGenericArgument val5 = QGenericArgument(),
QGenericArgument val6 = QGenericArgument(),
QGenericArgument val7 = QGenericArgument(),
QGenericArgument val8 = QGenericArgument(),
QGenericArgument val9 = QGenericArgument()) const
\overload invoke()
This overload can be used if the return value of the member is of no interest.
*/
/*!
\fn bool QMetaMethod::invoke(QObject *object,
QGenericArgument val0 = QGenericArgument(),
QGenericArgument val1 = QGenericArgument(),
QGenericArgument val2 = QGenericArgument(),
QGenericArgument val3 = QGenericArgument(),
QGenericArgument val4 = QGenericArgument(),
QGenericArgument val5 = QGenericArgument(),
QGenericArgument val6 = QGenericArgument(),
QGenericArgument val7 = QGenericArgument(),
QGenericArgument val8 = QGenericArgument(),
QGenericArgument val9 = QGenericArgument()) const
\overload invoke()
This overload invokes this method using the
connection type Qt::AutoConnection and ignores return values.
*/
/*!
\class QMetaEnum
\brief The QMetaEnum class provides meta-data about an enumerator.
\ingroup objectmodel
Use name() for the enumerator's name. The enumerator's keys (names
of each enumerated item) are returned by key(); use keyCount() to find
the number of keys. isFlag() returns whether the enumerator is
meant to be used as a flag, meaning that its values can be combined
using the OR operator.
The conversion functions keyToValue(), valueToKey(), keysToValue(),
and valueToKeys() allow conversion between the integer
representation of an enumeration or set value and its literal
representation. The scope() function returns the class scope this
enumerator was declared in.
\sa QMetaObject, QMetaMethod, QMetaProperty
*/
/*!
\fn bool QMetaEnum::isValid() const
Returns true if this enum is valid (has a name); otherwise returns
false.
\sa name()
*/
/*!
\fn const QMetaObject *QMetaEnum::enclosingMetaObject() const
\internal
*/
/*!
\fn QMetaEnum::QMetaEnum()
\internal
*/
/*!
Returns the name of the enumerator (without the scope).
For example, the Qt::AlignmentFlag enumeration has \c
AlignmentFlag as the name and \l Qt as the scope.
\sa isValid(), scope()
*/
const char *QMetaEnum::name() const
{
if (!mobj)
return Q_NULLPTR;
return mobj->d.stringdata + mobj->d.data[handle];
}
/*!
Returns the number of keys.
\sa key()
*/
int QMetaEnum::keyCount() const
{
if (!mobj)
return 0;
return mobj->d.data[handle + 2];
}
/*!
Returns the key with the given \a index, or 0 if no such key exists.
\sa keyCount(), value(), valueToKey()
*/
const char *QMetaEnum::key(int index) const
{
if (!mobj)
return Q_NULLPTR;
int count = mobj->d.data[handle + 2];
int data = mobj->d.data[handle + 3];
if (index >= 0 && index < count)
return mobj->d.stringdata + mobj->d.data[data + 2*index];
return Q_NULLPTR;
}
/*!
Returns the value with the given \a index; or returns -1 if there
is no such value.
\sa keyCount(), key(), keyToValue()
*/
int QMetaEnum::value(int index) const
{
if (!mobj)
return 0;
int count = mobj->d.data[handle + 2];
int data = mobj->d.data[handle + 3];
if (index >= 0 && index < count)
return mobj->d.data[data + 2*index + 1];
return -1;
}
/*!
Returns true if this enumerator is used as a flag; otherwise returns
false.
When used as flags, enumerators can be combined using the OR
operator.
\sa keysToValue(), valueToKeys()
*/
bool QMetaEnum::isFlag() const
{
return mobj && mobj->d.data[handle + 1];
}
/*!
Returns the scope this enumerator was declared in.
For example, the Qt::AlignmentFlag enumeration has \c Qt as
the scope and \c AlignmentFlag as the name.
\sa name()
*/
const char *QMetaEnum::scope() const
{
if (!mobj)
return Q_NULLPTR;
return mobj->d.stringdata;
}
/*!
Returns the integer value of the given enumeration \a key, or -1
if \a key is not defined.
For flag types, use keysToValue().
\sa valueToKey(), isFlag(), keysToValue()
*/
int QMetaEnum::keyToValue(const char *key) const
{
if (!mobj || !key)
return -1;
uint scope = 0;
const char *qualified_key = key;
const char *s = key + qstrlen(key);
while (s > key && *s != ':')
--s;
if (s > key && *(s-1)==':') {
scope = s - key - 1;
key += scope + 2;
}
int count = mobj->d.data[handle + 2];
int data = mobj->d.data[handle + 3];
for (int i = 0; i < count; ++i)
if ((!scope || (qstrlen(mobj->d.stringdata) == scope && strncmp(qualified_key, mobj->d.stringdata, scope) == 0))
&& strcmp(key, mobj->d.stringdata + mobj->d.data[data + 2*i]) == 0)
return mobj->d.data[data + 2*i + 1];
return -1;
}
/*!
Returns the string that is used as the name of the given
enumeration \a value, or 0 if \a value is not defined.
For flag types, use valueToKeys().
\sa isFlag(), valueToKeys()
*/
const char* QMetaEnum::valueToKey(int value) const
{
if (!mobj)
return Q_NULLPTR;
int count = mobj->d.data[handle + 2];
int data = mobj->d.data[handle + 3];
for (int i = 0; i < count; ++i)
if (value == (int)mobj->d.data[data + 2*i + 1])
return mobj->d.stringdata + mobj->d.data[data + 2*i];
return Q_NULLPTR;
}
/*!
Returns the value derived from combining together the values of
the \a keys using the OR operator, or -1 if \a keys is not
defined. Note that the strings in \a keys must be '|'-separated.
\sa isFlag(), valueToKey(), valueToKeys()
*/
int QMetaEnum::keysToValue(const char *keys) const
{
if (!mobj)
return -1;
QStringList l = QString::fromLatin1(keys).split(QLatin1Char('|'));
//#### TODO write proper code, do not use QStringList
int value = 0;
int count = mobj->d.data[handle + 2];
int data = mobj->d.data[handle + 3];
for (int li = 0; li < l.size(); ++li) {
QString trimmed = l.at(li).trimmed();
QByteArray qualified_key = trimmed.toLatin1();
const char *key = qualified_key.constData();
uint scope = 0;
const char *s = key + qstrlen(key);
while (s > key && *s != ':')
--s;
if (s > key && *(s-1)==':') {
scope = s - key - 1;
key += scope + 2;
}
int i;
for (i = count-1; i >= 0; --i)
if ((!scope || (qstrlen(mobj->d.stringdata) == scope && strncmp(qualified_key.constData(), mobj->d.stringdata, scope) == 0))
&& strcmp(key, mobj->d.stringdata + mobj->d.data[data + 2*i]) == 0) {
value |= mobj->d.data[data + 2*i + 1];
break;
}
if (i < 0)
value |= -1;
}
return value;
}
/*!
Returns a byte array of '|'-separated keys that represents the
given \a value.
\sa isFlag(), valueToKey(), keysToValue()
*/
QByteArray QMetaEnum::valueToKeys(int value) const
{
QByteArray keys;
if (!mobj)
return keys;
int count = mobj->d.data[handle + 2];
int data = mobj->d.data[handle + 3];
int v = value;
for(int i = 0; i < count; i++) {
int k = mobj->d.data[data + 2*i + 1];
if ((k != 0 && (v & k) == k ) || (k == value)) {
v = v & ~k;
if (!keys.isEmpty())
keys += '|';
keys += mobj->d.stringdata + mobj->d.data[data + 2*i];
}
}
return keys;
}
static QByteArray qualifiedName(const QMetaEnum &e)
{
return QByteArray(e.scope()) + "::" + e.name();
}
/*!
\class QMetaProperty
\brief The QMetaProperty class provides meta-data about a property.
\ingroup objectmodel
Property meta-data is obtained from an object's meta-object. See
QMetaObject::property() and QMetaObject::propertyCount() for
details.
\section1 Property Meta-Data
A property has a name() and a type(), as well as various
attributes that specify its behavior: isReadable(), isWritable(),
isDesignable(), isScriptable(), and isStored().
If the property is an enumeration, isEnumType() returns true; if the
property is an enumeration that is also a flag (i.e. its values
can be combined using the OR operator), isEnumType() and
isFlagType() both return true. The enumerator for these types is
available from enumerator().
The property's values are set and retrieved with read(), write(),
and reset(); they can also be changed through QObject's set and get
functions. See QObject::setProperty() and QObject::property() for
details.
\section1 Copying and Assignment
QMetaProperty objects can be copied by value. However, each copy will
refer to the same underlying property meta-data.
\sa QMetaObject, QMetaEnum, QMetaMethod, {Qt's Property System}
*/
/*!
\fn bool QMetaProperty::isValid() const
Returns true if this property is valid (readable); otherwise
returns false.
\sa isReadable()
*/
/*!
\fn const QMetaObject *QMetaProperty::enclosingMetaObject() const
\internal
*/
/*!
\internal
*/
QMetaProperty::QMetaProperty()
: mobj(Q_NULLPTR), handle(0), idx(0)
{
}
/*!
Returns this property's name.
\sa type(), typeName()
*/
const char *QMetaProperty::name() const
{
if (!mobj)
return Q_NULLPTR;
int handle = priv(mobj->d.data)->propertyData + 3*idx;
return mobj->d.stringdata + mobj->d.data[handle];
}
/*!
Returns the name of this property's type.
\sa type(), name()
*/
const char *QMetaProperty::typeName() const
{
if (!mobj)
return Q_NULLPTR;
int handle = priv(mobj->d.data)->propertyData + 3*idx;
return mobj->d.stringdata + mobj->d.data[handle + 1];
}
/*!
Returns this property's type. The return value is one
of the values of the QVariant::Type enumeration.
\sa userType(), typeName(), name()
*/
QVariant::Type QMetaProperty::type() const
{
if (!mobj)
return QVariant::Invalid;
int handle = priv(mobj->d.data)->propertyData + 3*idx;
uint flags = mobj->d.data[handle + 2];
uint type = flags >> 24;
if (type == 0xff) // special value for QVariant
type = QVariant::LastType;
if (type)
return QVariant::Type(type);
if (isEnumType()) {
int enumMetaTypeId = QMetaType::type(qualifiedName(menum));
if (enumMetaTypeId == 0)
return QVariant::Int;
}
#ifdef QT_COORD_TYPE
// qreal metatype must be resolved at runtime.
if (strcmp(typeName(), "qreal") == 0)
return QVariant::Type(qMetaTypeId<qreal>());
#endif
return QVariant::UserType;
}
/*!
\since 4.2
Returns this property's user type. The return value is one
of the values that are registered with QMetaType, or 0 if
the type is not registered.
\sa type(), QMetaType, typeName()
*/
int QMetaProperty::userType() const
{
QVariant::Type tp = type();
if (tp != QVariant::UserType)
return tp;
if (isEnumType()) {
int enumMetaTypeId = QMetaType::type(qualifiedName(menum));
return enumMetaTypeId;
}
return QMetaType::type(typeName());
}
/*!
\since 4.6
Returns this property's index.
*/
int QMetaProperty::propertyIndex() const
{
if (!mobj)
return -1;
return idx + mobj->propertyOffset();
}
/*!
Returns true if the property's type is an enumeration value that
is used as a flag; otherwise returns false.
Flags can be combined using the OR operator. A flag type is
implicitly also an enum type.
\sa isEnumType(), enumerator(), QMetaEnum::isFlag()
*/
bool QMetaProperty::isFlagType() const
{
return isEnumType() && menum.isFlag();
}
/*!
Returns true if the property's type is an enumeration value;
otherwise returns false.
\sa enumerator(), isFlagType()
*/
bool QMetaProperty::isEnumType() const
{
if (!mobj)
return false;
int handle = priv(mobj->d.data)->propertyData + 3*idx;
int flags = mobj->d.data[handle + 2];
return (flags & EnumOrFlag) && menum.name();
}
/*!
\internal
Returns true if the property has a C++ setter function that
follows Qt's standard "name" / "setName" pattern. Designer and uic
query hasStdCppSet() in order to avoid expensive
QObject::setProperty() calls. All properties in Qt [should] follow
this pattern.
*/
bool QMetaProperty::hasStdCppSet() const
{
if (!mobj)
return false;
int handle = priv(mobj->d.data)->propertyData + 3*idx;
int flags = mobj->d.data[handle + 2];
return (flags & StdCppSet);
}
/*!
Returns the enumerator if this property's type is an enumerator
type; otherwise the returned value is undefined.
\sa isEnumType(), isFlagType()
*/
QMetaEnum QMetaProperty::enumerator() const
{
return menum;
}
/*!
Reads the property's value from the given \a object. Returns the value
if it was able to read it; otherwise returns an invalid variant.
\sa write(), reset(), isReadable()
*/
QVariant QMetaProperty::read(const QObject *object) const
{
if (!object || !mobj)
return QVariant();
uint t = QVariant::Int;
if (isEnumType()) {
/*
try to create a QVariant that can be converted to this enum
type (only works if the enum has already been registered
with QMetaType)
*/
int enumMetaTypeId = QMetaType::type(qualifiedName(menum));
if (enumMetaTypeId != 0)
t = enumMetaTypeId;
} else {
int handle = priv(mobj->d.data)->propertyData + 3*idx;
uint flags = mobj->d.data[handle + 2];
const char *typeName = mobj->d.stringdata + mobj->d.data[handle + 1];
t = (flags >> 24);
if (t == 0xff) // special value for QVariant
t = QVariant::LastType;
if (t == QVariant::Invalid)
t = QMetaType::type(typeName);
if (t == QVariant::Invalid)
t = QVariant::nameToType(typeName);
if (t == QVariant::Invalid || t == QVariant::UserType) {
if (t == QVariant::Invalid)
qWarning("QMetaProperty::read: Unable to handle unregistered datatype '%s' for property '%s::%s'", typeName, mobj->className(), name());
return QVariant();
}
}
// the status variable is changed by qt_metacall to indicate what it did
// this feature is currently only used by QtDBus and should not be depended
// upon. Don't change it without looking into QDBusAbstractInterface first
// -1 (unchanged): normal qt_metacall, result stored in argv[0]
// changed: result stored directly in value
int status = -1;
QVariant value;
void *argv[] = { Q_NULLPTR, &value, &status };
if (t == QVariant::LastType) {
argv[0] = &value;
} else {
value = QVariant(t, Q_NULLPTR);
argv[0] = value.data();
}
QMetaObject::metacall(const_cast<QObject*>(object), QMetaObject::ReadProperty,
idx + mobj->propertyOffset(), argv);
if (status != -1)
return value;
if (t != QVariant::LastType && argv[0] != value.data())
// pointer or reference
return QVariant((QVariant::Type)t, argv[0]);
return value;
}
/*!
Writes \a value as the property's value to the given \a object. Returns
true if the write succeeded; otherwise returns false.
\sa read(), reset(), isWritable()
*/
bool QMetaProperty::write(QObject *object, const QVariant &value) const
{
if (!object || !isWritable())
return false;
QVariant v = value;
uint t = QVariant::Invalid;
if (isEnumType()) {
if (v.type() == QVariant::String
) {
if (isFlagType())
v = QVariant(menum.keysToValue(value.toByteArray()));
else
v = QVariant(menum.keyToValue(value.toByteArray()));
} else if (v.type() != QVariant::Int && v.type() != QVariant::UInt) {
int enumMetaTypeId = QMetaType::type(qualifiedName(menum));
if ((enumMetaTypeId == 0) || (v.userType() != enumMetaTypeId) || !v.constData())
return false;
v = QVariant(*reinterpret_cast<const int *>(v.constData()));
}
v.convert(QVariant::Int);
} else {
int handle = priv(mobj->d.data)->propertyData + 3*idx;
uint flags = mobj->d.data[handle + 2];
t = flags >> 24;
if (t == 0xff) // special value for QVariant
t = QVariant::LastType;
if (t == QVariant::Invalid) {
const char *typeName = mobj->d.stringdata + mobj->d.data[handle + 1];
const char *vtypeName = value.typeName();
if (vtypeName && strcmp(typeName, vtypeName) == 0)
t = value.userType();
else
t = QVariant::nameToType(typeName);
}
if (t == QVariant::Invalid)
return false;
if (t != QVariant::LastType && t != (uint)value.userType() && (t < QMetaType::User && !v.convert((QVariant::Type)t)))
return false;
}
// the status variable is changed by qt_metacall to indicate what it did
// this feature is currently only used by QtDBus and should not be depended
// upon. Don't change it without looking into QDBusAbstractInterface first
// -1 (unchanged): normal qt_metacall, result stored in argv[0]
// changed: result stored directly in value, return the value of status
int status = -1;
// the flags variable is used by the declarative module to implement
// interception of property writes.
int flags = 0;
void *argv[] = { Q_NULLPTR, &v, &status, &flags };
if (t == QVariant::LastType)
argv[0] = &v;
else
argv[0] = v.data();
QMetaObject::metacall(object, QMetaObject::WriteProperty, idx + mobj->propertyOffset(), argv);
return status;
}
/*!
Resets the property for the given \a object with a reset method.
Returns true if the reset worked; otherwise returns false.
Reset methods are optional; only a few properties support them.
\sa read(), write()
*/
bool QMetaProperty::reset(QObject *object) const
{
if (!object || !mobj || !isResettable())
return false;
void *argv[] = { Q_NULLPTR };
QMetaObject::metacall(object, QMetaObject::ResetProperty, idx + mobj->propertyOffset(), argv);
return true;
}
/*!
Returns true if this property can be reset to a default value; otherwise
returns false.
\sa reset()
*/
bool QMetaProperty::isResettable() const
{
if (!mobj)
return false;
int flags = mobj->d.data[handle + 2];
return flags & Resettable;
}
/*!
Returns true if this property is readable; otherwise returns false.
\sa isWritable(), read(), isValid()
*/
bool QMetaProperty::isReadable() const
{
if (!mobj)
return false;
int flags = mobj->d.data[handle + 2];
return flags & Readable;
}
/*!
Returns true if this property has a corresponding change notify signal;
otherwise returns false.
\sa notifySignal()
*/
bool QMetaProperty::hasNotifySignal() const
{
if (!mobj)
return false;
int flags = mobj->d.data[handle + 2];
return flags & Notify;
}
/*!
\since 4.5
Returns the QMetaMethod instance of the property change notifying signal if
one was specified, otherwise returns an invalid QMetaMethod.
\sa hasNotifySignal()
*/
QMetaMethod QMetaProperty::notifySignal() const
{
int id = notifySignalIndex();
if (id != -1)
return mobj->method(id);
else
return QMetaMethod();
}
/*!
\since 4.6
Returns the index of the property change notifying signal if one was
specified, otherwise returns -1.
\sa hasNotifySignal()
*/
int QMetaProperty::notifySignalIndex() const
{
if (hasNotifySignal()) {
int offset = priv(mobj->d.data)->propertyData +
priv(mobj->d.data)->propertyCount * 3 + idx;
return mobj->d.data[offset] + mobj->methodOffset();
} else {
return -1;
}
}
/*!
\internal
Returns the property revision if one was
specified by REVISION, otherwise returns 0.
*/
int QMetaProperty::revision() const
{
if (!mobj)
return 0;
int flags = mobj->d.data[handle + 2];
if (flags & Revisioned) {
int offset = priv(mobj->d.data)->propertyData +
priv(mobj->d.data)->propertyCount * 3 + idx;
// Revision data is placed after NOTIFY data, if present.
// Iterate through properties to discover whether we have NOTIFY signals.
for (int i = 0; i < priv(mobj->d.data)->propertyCount; ++i) {
int handle = priv(mobj->d.data)->propertyData + 3*i;
if (mobj->d.data[handle + 2] & Notify) {
offset += priv(mobj->d.data)->propertyCount;
break;
}
}
return mobj->d.data[offset];
} else {
return 0;
}
}
/*!
Returns true if this property is writable; otherwise returns
false.
\sa isReadable(), write()
*/
bool QMetaProperty::isWritable() const
{
if (!mobj)
return false;
int flags = mobj->d.data[handle + 2];
return flags & Writable;
}
/*!
Returns true if this property is designable for the given \a object;
otherwise returns false.
If no \a object is given, the function returns false if the
\c{Q_PROPERTY()}'s \c DESIGNABLE attribute is false; otherwise
returns true (if the attribute is true or is a function or expression).
\sa isScriptable(), isStored()
*/
bool QMetaProperty::isDesignable(const QObject *object) const
{
if (!mobj)
return false;
int flags = mobj->d.data[handle + 2];
bool b = flags & Designable;
if (object) {
void *argv[] = { &b };
QMetaObject::metacall(const_cast<QObject*>(object), QMetaObject::QueryPropertyDesignable,
idx + mobj->propertyOffset(), argv);
}
return b;
}
/*!
Returns true if the property is scriptable for the given \a object;
otherwise returns false.
If no \a object is given, the function returns false if the
\c{Q_PROPERTY()}'s \c SCRIPTABLE attribute is false; otherwise returns
true (if the attribute is true or is a function or expression).
\sa isDesignable(), isStored()
*/
bool QMetaProperty::isScriptable(const QObject *object) const
{
if (!mobj)
return false;
int flags = mobj->d.data[handle + 2];
bool b = flags & Scriptable;
if (object) {
void *argv[] = { &b };
QMetaObject::metacall(const_cast<QObject*>(object), QMetaObject::QueryPropertyScriptable,
idx + mobj->propertyOffset(), argv);
}
return b;
}
/*!
Returns true if the property is stored for \a object; otherwise returns
false.
If no \a object is given, the function returns false if the
\c{Q_PROPERTY()}'s \c STORED attribute is false; otherwise returns
true (if the attribute is true or is a function or expression).
\sa isDesignable(), isScriptable()
*/
bool QMetaProperty::isStored(const QObject *object) const
{
if (!mobj)
return false;
int flags = mobj->d.data[handle + 2];
bool b = flags & Stored;
if (object) {
void *argv[] = { &b };
QMetaObject::metacall(const_cast<QObject*>(object), QMetaObject::QueryPropertyStored,
idx + mobj->propertyOffset(), argv);
}
return b;
}
/*!
Returns true if this property is designated as the \c USER
property, i.e., the one that the user can edit for \a object or
that is significant in some other way. Otherwise it returns
false. e.g., the \c text property is the \c USER editable property
of a QLineEdit.
If \a object is null, the function returns false if the \c
{Q_PROPERTY()}'s \c USER attribute is false. Otherwise it returns
true.
\sa QMetaObject::userProperty(), isDesignable(), isScriptable()
*/
bool QMetaProperty::isUser(const QObject *object) const
{
if (!mobj)
return false;
int flags = mobj->d.data[handle + 2];
bool b = flags & User;
if (object) {
void *argv[] = { &b };
QMetaObject::metacall(const_cast<QObject*>(object), QMetaObject::QueryPropertyUser,
idx + mobj->propertyOffset(), argv);
}
return b;
}
/*!
\since 4.6
Returns true if the property is constant; otherwise returns false.
A property is constant if the \c{Q_PROPERTY()}'s \c CONSTANT attribute
is set.
*/
bool QMetaProperty::isConstant() const
{
if (!mobj)
return false;
int flags = mobj->d.data[handle + 2];
return flags & Constant;
}
/*!
\since 4.6
Returns true if the property is final; otherwise returns false.
A property is final if the \c{Q_PROPERTY()}'s \c FINAL attribute
is set.
*/
bool QMetaProperty::isFinal() const
{
if (!mobj)
return false;
int flags = mobj->d.data[handle + 2];
return flags & Final;
}
/*!
\obsolete
Returns true if the property is editable for the given \a object;
otherwise returns false.
If no \a object is given, the function returns false if the
\c{Q_PROPERTY()}'s \c EDITABLE attribute is false; otherwise returns
true (if the attribute is true or is a function or expression).
\sa isDesignable(), isScriptable(), isStored()
*/
bool QMetaProperty::isEditable(const QObject *object) const
{
if (!mobj)
return false;
int flags = mobj->d.data[handle + 2];
bool b = flags & Editable;
if (object) {
void *argv[] = { &b };
QMetaObject::metacall(const_cast<QObject*>(object), QMetaObject::QueryPropertyEditable,
idx + mobj->propertyOffset(), argv);
}
return b;
}
/*!
\class QMetaClassInfo
\brief The QMetaClassInfo class provides additional information
about a class.
\ingroup objectmodel
Class information items are simple \e{name}--\e{value} pairs that
are specified using Q_CLASSINFO() in the source code. The
information can be retrieved using name() and value(). For example:
\snippet doc/src/snippets/code/src_corelib_kernel_qmetaobject.cpp 5
This mechanism is free for you to use in your Qt applications. Qt
doesn't use it for any of its classes.
\sa QMetaObject
*/
/*!
\fn QMetaClassInfo::QMetaClassInfo()
\internal
*/
/*!
\fn const QMetaObject *QMetaClassInfo::enclosingMetaObject() const
\internal
*/
/*!
Returns the name of this item.
\sa value()
*/
const char *QMetaClassInfo::name() const
{
if (!mobj)
return Q_NULLPTR;
return mobj->d.stringdata + mobj->d.data[handle];
}
/*!
Returns the value of this item.
\sa name()
*/
const char* QMetaClassInfo::value() const
{
if (!mobj)
return Q_NULLPTR;
return mobj->d.stringdata + mobj->d.data[handle + 1];
}
/*!
\macro QGenericArgument Q_ARG(Type, const Type &value)
\relates QMetaObject
This macro takes a \a Type and a \a value of that type and
returns a \l QGenericArgument object that can be passed to
QMetaObject::invokeMethod().
\sa Q_RETURN_ARG()
*/
/*!
\macro QGenericReturnArgument Q_RETURN_ARG(Type, Type &value)
\relates QMetaObject
This macro takes a \a Type and a non-const reference to a \a
value of that type and returns a QGenericReturnArgument object
that can be passed to QMetaObject::invokeMethod().
\sa Q_ARG()
*/
/*!
\class QGenericArgument
\brief The QGenericArgument class is an internal helper class for
marshalling arguments.
This class should never be used directly. Please use the \l Q_ARG()
macro instead.
\sa Q_ARG(), QMetaObject::invokeMethod(), QGenericReturnArgument
*/
/*!
\fn QGenericArgument::QGenericArgument(const char *name, const void *data)
Constructs a QGenericArgument object with the given \a name and \a data.
*/
/*!
\fn QGenericArgument::data () const
Returns the data set in the constructor.
*/
/*!
\fn QGenericArgument::name () const
Returns the name set in the constructor.
*/
/*!
\class QGenericReturnArgument
\brief The QGenericReturnArgument class is an internal helper class for
marshalling arguments.
This class should never be used directly. Please use the
Q_RETURN_ARG() macro instead.
\sa Q_RETURN_ARG(), QMetaObject::invokeMethod(), QGenericArgument
*/
/*!
\fn QGenericReturnArgument::QGenericReturnArgument(const char *name, void *data)
Constructs a QGenericReturnArgument object with the given \a name
and \a data.
*/
/*! \internal
If the local_method_index is a cloned method, return the index of the original.
Example: if the index of "destroyed()" is passed, the index of "destroyed(QObject*)" is returned
*/
int QMetaObjectPrivate::originalClone(const QMetaObject *mobj, int local_method_index)
{
Q_ASSERT(local_method_index < get(mobj)->methodCount);
int handle = get(mobj)->methodData + 5 * local_method_index;
while (mobj->d.data[handle + 4] & MethodCloned) {
Q_ASSERT(local_method_index > 0);
handle -= 5;
local_method_index--;
}
return local_method_index;
}
#include "moc_qnamespace.h"
QT_END_NAMESPACE
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