qmetaobject.cpp

奇趣公司比较新的qt/emd版本

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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 "private/qobject_p.h"
#include "private/qmetaobject_p.h"

#include <ctype.h>

/*!
    \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 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.
    \endlist

    The index functions indexOfMethod(), indexOfEnumerator(), and
    indexOfProperty() map names of 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
*/

/*!
    \enum QMetaMethod::Access

    \internal
*/

// do not touch without touching the moc as well
enum PropertyFlags  {
    Invalid = 0x00000000,
    Readable = 0x00000001,
    Writable = 0x00000002,
    Resettable = 0x00000004,
    EnumOrFlag = 0x00000008,
    StdCppSet = 0x00000100,
//    Override = 0x00000200,
    Designable = 0x00001000,
    ResolveDesignable = 0x00002000,
    Scriptable = 0x00004000,
    ResolveScriptable = 0x00008000,
    Stored = 0x00010000,
    ResolveStored = 0x00020000,
    Editable = 0x00040000,
    ResolveEditable = 0x00080000,
    User = 0x00100000,
    ResolveUser = 0x00200000
};

enum MethodFlags  {
    AccessPrivate = 0x00,
    AccessProtected = 0x01,
    AccessPublic = 0x02,
    AccessMask = 0x03, //mask

    MethodMethod = 0x00,
    MethodSignal = 0x04,
    MethodSlot = 0x08,
    MethodTypeMask = 0x0c,

    MethodCompatibility = 0x10,
    MethodCloned = 0x20,
    MethodScriptable = 0x40
};

struct QMetaObjectPrivate
{
    int revision;
    int className;
    int classInfoCount, classInfoData;
    int methodCount, methodData;
    int propertyCount, propertyData;
    int enumeratorCount, enumeratorData;
};

static inline const QMetaObjectPrivate *priv(const uint* data)
{ return reinterpret_cast<const QMetaObjectPrivate*>(data); }


/*!
    \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 const_cast<QObject*>(obj);
        } while ((m = m->d.superdata));
    }
    return 0;
}

#ifndef QT_NO_TRANSLATION
/*!
    \internal
*/
QString QMetaObject::tr(const char *s, const char *c) const
{
    return QCoreApplication::translate(d.stringdata, s, c, QCoreApplication::CodecForTr);
}

/*!
    \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) const
{
    return QCoreApplication::translate(d.stringdata, s, c, QCoreApplication::UnicodeUTF8);
}

/*!
    \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;
}

/*!
    Returns the number of methods in this class. These include
    signals and slots.

    \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.

    \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;
}

/*!
    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
{
    int i = -1;
    const QMetaObject *m = this;
    while (m && i < 0) {
        for (i = priv(m->d.data)->methodCount-1; i >= 0; --i)
            if (strcmp(method, m->d.stringdata
                       + m->d.data[priv(m->d.data)->methodData + 5*i]) == 0) {
                i += m->methodOffset();
                break;
            }
        m = m->d.superdata;
    }
    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
{
    int i = -1;
    const QMetaObject *m = this;
    while (m && i < 0) {
        for (i = priv(m->d.data)->methodCount-1; i >= 0; --i)
            if ((m->d.data[priv(m->d.data)->methodData + 5*i + 4] & MethodTypeMask) == MethodSignal
                && strcmp(signal, m->d.stringdata
                          + m->d.data[priv(m->d.data)->methodData + 5*i]) == 0) {
                i += m->methodOffset();
                break;
            }
        m = m->d.superdata;
    }
#ifndef QT_NO_DEBUG
    if (i >= 0 && m && m->d.superdata) {
        int conflict = m->d.superdata->indexOfMethod(signal);
        if (conflict >= 0)
            qWarning("QMetaObject::indexOfSignal:%s: Conflict with %s::%s",
                      m->d.stringdata, m->d.superdata->d.stringdata, signal);
    }
#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
{
    int i = -1;
    const QMetaObject *m = this;
    while (m && i < 0) {
        for (i = priv(m->d.data)->methodCount-1; i >= 0; --i)
            if ((m->d.data[priv(m->d.data)->methodData + 5*i + 4] & MethodTypeMask) == MethodSlot
                && strcmp(slot, m->d.stringdata
                       + m->d.data[priv(m->d.data)->methodData + 5*i]) == 0) {
                i += m->methodOffset();
                break;
            }
        m = m->d.superdata;
    }
    return i;
}

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.extradata) {
            const QMetaObject **e = self->d.extradata;
            while (*e) {
                if (const QMetaObject *m =QMetaObject_findMetaObject((*e), name))
                    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
{
    int i = -1;
    const QMetaObject *m = this;
    while (m && i < 0) {
        for (i = priv(m->d.data)->enumeratorCount-1; i >= 0; --i)
            if (strcmp(name, m->d.stringdata
                       + m->d.data[priv(m->d.data)->enumeratorData + 4*i]) == 0) {
                i += m->enumeratorOffset();
                break;
            }
        m = m->d.superdata;
    }
    return i;
}

/*!
    Finds property \a name and returns its index; otherwise returns