QT元编程----Q_ENUMS

Posted 2021-11-27 svenzhang9527

头文件中定义枚举类型并设置Q_ENUMS

#ifndef TEST_H
#define TEST_H

#include <QObject>
#include <QMetaEnum>

class Test : public QObject
{
Q_OBJECT
Q_ENUMS(TestType) //[1] 

public:
explicit Test(QObject *parent = nullptr);

enum TestType
{
TEST_ONE,
TEST_TWO,
TEST_THREE
};

signals:

public slots:
void DoTest(QString command);
};

#endif // TEST_H

源文件中的调用方式：

#include "test.h"
#include <QDebug>

Test::Test(QObject *parent) : QObject(parent)
{

}

void Test::DoTest(QString command)
{
//[2] QMetaObject是用来保存Qt元对象的元信息，当继承QObject类并使用宏Q_OBJECT时，创建的类产生一个静态QMetaObject实例staticMetaObject，这个实例会保存类名、信号名称及索引、槽的名字及索引等等在对象操作时需要的基本信息

QMetaObject object = this->staticMetaObject; 
QMetaEnum MeteEnum = object.enumerator(
object.indexOfEnumerator("Tests")); //[3]
switch (MeteEnum.keysToValue(command.toLatin1())) //[4]
{
case TEST_ONE:
qDebug() << "TEST 1";
break;
case TEST_TWO:
qDebug() << "TEST 2";
break;
case TEST_THREE:
qDebug() << "TEST 3";
break;
default:
qDebug() << "TEST NONE";
break;
}
}

测试程序调用类：

#include <QCoreApplication>
#include "test.h"

int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
Test cTest;
cTest.DoTest(QString("sfe"));
cTest.DoTest(QString("TEST1"));
return a.exec();
}