Export enum from C++ into QML

[Alien]

Hey,

I want to have enum in my c++ class and use it in qml but the value of enum elements are undefined.

My header file:

#ifndef CENUM_TEST_H
#define CENUM_TEST_H

#include <QObject>



class C_TEST : public QObject
{
    Q_OBJECT
    Q_PROPERTY(int MODE MEMBER m_mode NOTIFY modeChanged)
private:
    int m_mode;
public:
    explicit C_TEST(QObject *parent = nullptr);


    enum MY_ENUM
    {
      One=0,
      Two,
      Three
    };
    Q_ENUM(MY_ENUM)

    int mode() const;
    void setMode(int mode);

signals:
    void modeChanged();

public slots:
};

#endif // CENUM_TEST_H

CPP

#include "c_test.h"

int C_TEST::mode() const
{
    return m_mode;
}

void C_TEST::setMode(int mode)
{
    if(m_mode != mode)
    {
    m_mode = mode;
emit modeChanged();
    }

}

C_TEST::C_TEST(QObject *parent) : QObject(parent)
{
    setMode(2);
}

My main.cpp:

int main(int argc, char *argv[])
{
#if defined(Q_OS_WIN)
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
#endif
    QGuiApplication app(argc, argv);
    C_TEST test;
    QQmlApplicationEngine engine;
    engine.rootContext()->setContextProperty("COBJECT",&test);
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
    if (engine.rootObjects().isEmpty())
        return -1;
    return app.exec();
}

finally my qml document:

import QtQuick 2.9

Rectangle
{
    id:rectID
    property alias textField: textID
    property int mode: COBJECT.MODE
    x:10*index
    y:index*height
    width:45; height:25
    color: "red"
    Text
    {
        anchors.fill: parent
        id: textID
        text:
        {
            switch(mode)
            {
            case COBJECT.One:
                qsTr("1")
                break;
            case COBJECT.Two:
                qsTr("2")
                break;
            case COBJECT.Three:
                qsTr("3")
                break;
            default:
                qsTr("NONE");
            }
        }
    }

    Item
    {
      focus: true
      Keys.onPressed:
      {
        rectID[index].textField.text = "hey"
      }
    }
}

Extra Information:

OS:Ubuntu 16.04LTS
QT SDK: 5.10.0
QT CREATOR:4.5.0

I appreciate your help.
Yours,

[J.Hilk]

@Alien hi,
IIRC you'll have to register the enums seperately in your main.cpp using qmlRegisterUncreatableType

something along this:

qmlRegisterUncreatableType<C_TEST >("CppEnums",1,0,"Enums","Enum is not a type");

//qml
import CppEnums 1.0
...
Text
    {
        anchors.fill: parent
        id: textID
        text:
        {
            switch(mode)
            {
            case Enums.One:
                qsTr("1")
                break;
            case Enums.Two:
                qsTr("2")
                break;
            case Enums.Three:
                qsTr("3")
                break;
            default:
                qsTr("NONE");
            }
        }
    }

you can also make your Q_Property directly of your enum type without the cast into int

Q_PROPERTY(MY_ENUM MODE MEMBER m_mode NOTIFY modeChanged)

[Alien]

Thank you for your solution that works fine but I think that I've to use both registration please look at the below code

engine.rootContext()->setContextProperty("COBJECT",&test);
qmlRegisterUncreatableType<C_TEST >("CppEnums",1,0,"Enums","Enum is not a type");

Since I need the mode variable (this variable will change time to time)
does this usage have any problems?

[J.Hilk]

@Alien said in Export enum from C++ into QML:

Thank you for your solution that works fine but I think that I've to use both registration please look at the below code

engine.rootContext()->setContextProperty("COBJECT",&test);
qmlRegisterUncreatableType<C_TEST >("CppEnums",1,0,"Enums","Enum is not a type");

Since I need the mode variable (this variable will change time to time)

you need the contxtProperty too, the qmlRegisterUncreatableType just makes your Enum(-class) available to your qml files you still need a reference object from your cpp-backend.

does this usage have any problems?

I don't think so, I use it the same way.

[beecksche]

This post is deleted!