Qt Meta-Object System
一、测试源码
widget.h
#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
#include <QPainter>
#include <QSize>
#include <QDebug>
class Widget : public QWidget
{
Q_OBJECT
Q_PROPERTY(int age READ age WRITE setAge NOTIFY ageChanged)
public:
Widget(QWidget *parent = 0);
~Widget();
void paintEvent(QPaintEvent* event);
QSize sizeHint() const {
return QSize(400, 400);
}
int age()const {
return m_age;
}
void setAge(const int& age) {
m_age = age;
emit ageChanged(m_age);
}
protected:
int m_age;
signals:
void sig0();
int sig1(int value);
void ageChanged(int age);
public slots:
void st0() {
qDebug() << "st0";
}
private slots:
void st1() {
qDebug() << "st1";
}
};
#endif // WIDGET_H
widget.cpp
#include "widget.h"
Widget::Widget(QWidget *parent)
: QWidget(parent)
{
}
Widget::~Widget()
{
}
void Widget::paintEvent(QPaintEvent* event) {
QPainter painter(this);
painter.drawText(50, 50, "This is widget");
}
main.cpp
#include "widget.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Widget w;
w.show();
return a.exec();
}
二、moc编译后
widget.h 宏展开
#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
#include <QPainter>
#include <QSize>
#include <QDebug>
class Widget : public QWidget
{
//Q_OBJECT
public:
static const QMetaObject staticMetaObject;
virtual const QMetaObject *metaObject() const;
virtual void *qt_metacast(const char *);
virtual int qt_metacall(QMetaObject::Call, int, void **);
private:
static void qt_static_metacall(QObject *, QMetaObject::Call, int, void **);
struct QPrivateSignal {};
//Q_OBJECT end
//Q_PROPERTY(int age READ age WRITE setAge NOTIFY ageChanged)
public:
Widget(QWidget *parent = 0);
~Widget();
void paintEvent(QPaintEvent* event);
QSize sizeHint() const {
return QSize(400, 400);
}
int age()const {
return m_age;
}
void setAge(const int& age) {
m_age = age;
emit ageChanged(m_age);
}
protected:
int m_age;
signals:
void sig0();
int sig1(int value);
void ageChanged(int age);
public slots:
void st0() {
qDebug() << "st0";
}
private slots:
void st1() {
qDebug() << "st1";
}
};
#endif // WIDGET_H
moc_widget.cpp
#include "../../sample1/widget.h"
#include <QtCore/qbytearray.h>
#include <QtCore/qmetatype.h>
#if !defined(Q_MOC_OUTPUT_REVISION)
#error "The header file 'widget.h' doesn't include <QObject>."
#elif Q_MOC_OUTPUT_REVISION != 67
#error "This file was generated using the moc from 5.12.0. It"
#error "cannot be used with the include files from this version of Qt."
#error "(The moc has changed too much.)"
#endif
QT_BEGIN_MOC_NAMESPACE
QT_WARNING_PUSH
QT_WARNING_DISABLE_DEPRECATED
struct qt_meta_stringdata_Widget_t {
QByteArrayData data[9];
char stringdata0[47];
};
#define QT_MOC_LITERAL(idx, ofs, len) \
Q_STATIC_BYTE_ARRAY_DATA_HEADER_INITIALIZER_WITH_OFFSET(len, \
qptrdiff(offsetof(qt_meta_stringdata_Widget_t, stringdata0) + ofs \
- idx * sizeof(QByteArrayData)) \
)
static const qt_meta_stringdata_Widget_t qt_meta_stringdata_Widget = {
{
QT_MOC_LITERAL(0, 0, 6), // "Widget"
QT_MOC_LITERAL(1, 7, 4), // "sig0"
QT_MOC_LITERAL(2, 12, 0), // ""
QT_MOC_LITERAL(3, 13, 4), // "sig1"
QT_MOC_LITERAL(4, 18, 5), // "value"
QT_MOC_LITERAL(5, 24, 10), // "ageChanged"
QT_MOC_LITERAL(6, 35, 3), // "age"
QT_MOC_LITERAL(7, 39, 3), // "st0"
QT_MOC_LITERAL(8, 43, 3) // "st1"
},
"Widget\0sig0\0\0sig1\0value\0ageChanged\0"
"age\0st0\0st1"
};
#undef QT_MOC_LITERAL
static const uint qt_meta_data_Widget[] = {
// content:
8, // revision
0, // classname
0, 0, // classinfo
5, 14, // methods
1, 48, // properties
0, 0, // enums/sets
0, 0, // constructors
0, // flags
3, // signalCount
// signals: name, argc, parameters, tag, flags
1, 0, 39, 2, 0x06 /* Public */,
3, 1, 40, 2, 0x06 /* Public */,
5, 1, 43, 2, 0x06 /* Public */,
// slots: name, argc, parameters, tag, flags
7, 0, 46, 2, 0x0a /* Public */,
8, 0, 47, 2, 0x08 /* Private */,
// signals: parameters
QMetaType::Void,
QMetaType::Int, QMetaType::Int, 4,
QMetaType::Void, QMetaType::Int, 6,
// slots: parameters
QMetaType::Void,
QMetaType::Void,
// properties: name, type, flags
6, QMetaType::Int, 0x00495103,
// properties: notify_signal_id
2,
0 // eod
};
void Widget::qt_static_metacall(QObject *_o, QMetaObject::Call _c, int _id, void **_a)
{
if (_c == QMetaObject::InvokeMetaMethod) {
Widget *_t = static_cast<Widget *>(_o);
Q_UNUSED(_t)
switch (_id) {
case 0: _t->sig0(); break;
case 1: { int _r = _t->sig1((*reinterpret_cast< int(*)>(_a[1])));
if (_a[0]) *reinterpret_cast< int*>(_a[0]) = std::move(_r); } break;
case 2: _t->ageChanged((*reinterpret_cast< int(*)>(_a[1]))); break;
case 3: _t->st0(); break;
case 4: _t->st1(); break;
default: ;
}
} else if (_c == QMetaObject::IndexOfMethod) {
int *result = reinterpret_cast<int *>(_a[0]);
{
using _t = void (Widget::*)();
if (*reinterpret_cast<_t *>(_a[1]) == static_cast<_t>(&Widget::sig0)) {
*result = 0;
return;
}
}
{
using _t = int (Widget::*)(int );
if (*reinterpret_cast<_t *>(_a[1]) == static_cast<_t>(&Widget::sig1)) {
*result = 1;
return;
}
}
{
using _t = void (Widget::*)(int );
if (*reinterpret_cast<_t *>(_a[1]) == static_cast<_t>(&Widget::ageChanged)) {
*result = 2;
return;
}
}
}
#ifndef QT_NO_PROPERTIES
else if (_c == QMetaObject::ReadProperty) {
Widget *_t = static_cast<Widget *>(_o);
Q_UNUSED(_t)
void *_v = _a[0];
switch (_id) {
case 0: *reinterpret_cast< int*>(_v) = _t->age(); break;
default: break;
}
} else if (_c == QMetaObject::WriteProperty) {
Widget *_t = static_cast<Widget *>(_o);
Q_UNUSED(_t)
void *_v = _a[0];
switch (_id) {
case 0: _t->setAge(*reinterpret_cast< int*>(_v)); break;
default: break;
}
} else if (_c == QMetaObject::ResetProperty) {
}
#endif // QT_NO_PROPERTIES
}
QT_INIT_METAOBJECT const QMetaObject Widget::staticMetaObject = { {
&QWidget::staticMetaObject,
qt_meta_stringdata_Widget.data,
qt_meta_data_Widget,
qt_static_metacall,
nullptr,
nullptr
} };
const QMetaObject *Widget::metaObject() const
{
return QObject::d_ptr->metaObject ? QObject::d_ptr->dynamicMetaObject() : &staticMetaObject;
}
void *Widget::qt_metacast(const char *_clname)
{
if (!_clname) return nullptr;
if (!strcmp(_clname, qt_meta_stringdata_Widget.stringdata0))
return static_cast<void*>(this);
return QWidget::qt_metacast(_clname);
}
int Widget::qt_metacall(QMetaObject::Call _c, int _id, void **_a)
{
_id = QWidget::qt_metacall(_c, _id, _a);
if (_id < 0)
return _id;
if (_c == QMetaObject::InvokeMetaMethod) {
if (_id < 5)
qt_static_metacall(this, _c, _id, _a);
_id -= 5;
} else if (_c == QMetaObject::RegisterMethodArgumentMetaType) {
if (_id < 5)
*reinterpret_cast<int*>(_a[0]) = -1;
_id -= 5;
}
#ifndef QT_NO_PROPERTIES
else if (_c == QMetaObject::ReadProperty || _c == QMetaObject::WriteProperty
|| _c == QMetaObject::ResetProperty || _c == QMetaObject::RegisterPropertyMetaType) {
qt_static_metacall(this, _c, _id, _a);
_id -= 1;
} else if (_c == QMetaObject::QueryPropertyDesignable) {
_id -= 1;
} else if (_c == QMetaObject::QueryPropertyScriptable) {
_id -= 1;
} else if (_c == QMetaObject::QueryPropertyStored) {
_id -= 1;
} else if (_c == QMetaObject::QueryPropertyEditable) {
_id -= 1;
} else if (_c == QMetaObject::QueryPropertyUser) {
_id -= 1;
}
#endif // QT_NO_PROPERTIES
return _id;
}
// SIGNAL 0
void Widget::sig0()
{
QMetaObject::activate(this, &staticMetaObject, 0, nullptr);
}
// SIGNAL 1
int Widget::sig1(int _t1)
{
int _t0{};
void *_a[] = { const_cast<void*>(reinterpret_cast<const void*>(&_t0)), const_cast<void*>(reinterpret_cast<const void*>(&_t1)) };
QMetaObject::activate(this, &staticMetaObject, 1, _a);
return _t0;
}
// SIGNAL 2
void Widget::ageChanged(int _t1)
{
void *_a[] = { nullptr, const_cast<void*>(reinterpret_cast<const void*>(&_t1)) };
QMetaObject::activate(this, &staticMetaObject, 2, _a);
}
QT_WARNING_POP
QT_END_MOC_NAMESPACE
解析