Evgenii Legotckoi
Evgenii LegotckoiJuly 1, 2017, 6:03 a.m.

QML - Tutorial 028. Registration of custom enum in QML

In order to use enum enum enumerations in Q ++, you need to create a class inherited from QObject and register it as a QML Type before running the QML engine in the application.

To learn, create a project using QtQuick.

The minimum version of this class with enumerations will be as follows:

#ifndef INFO_H
#define INFO_H

#include <QObject>

class Info : public QObject
{
    Q_OBJECT
public:
    enum State {
        Information,
        Debug,
        Warning,
        Error
    };
    Q_ENUM(State)
};

#endif // INFO_H

Next, you need to register this class as a QML Type in the main function. This requires a QtQml header file and a qmlRegisterType function.

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QtQml> // Include QtQml to use qmlRegisterType

#include "info.h" // Connect the header file of the Info class

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);

    qmlRegisterType<Info>("info", 1, 0, "Info"); // Register this class as a module

    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
    if (engine.rootObjects().isEmpty())
        return -1;

    return app.exec();
}

After that it will only be necessary to connect the new QML module in the main.qml file and use the enumerations to display the text. We will output the message "Message 0", "Message 1", etc. The numbers will be taken from the enumerations.

import QtQuick 2.5
import QtQuick.Window 2.2
import QtQuick.Controls 1.4

import info 1.0  // Import Module

Window {
    visible: true
    width: 360
    height: 360
    title: qsTr("Enumeration")

    ListView {
        anchors.fill: parent
        delegate: Item {
            height: 48
            width: parent.width
            Text {
                anchors.fill: parent
                text: "Message " + model.text

                verticalAlignment: Text.AlignVCenter
                horizontalAlignment: Text.AlignHCenter
            }
        }

        model: ListModel {
            // Use the enumerations from C ++
            ListElement {text: Info.Information}
            ListElement {text: Info.Debug}
            ListElement {text: Info.Warning}
            ListElement {text: Info.Error}
        }
    }
}

Appearance of the application will be as follows:

We recommend hosting TIMEWEB
We recommend hosting TIMEWEB
Stable hosting, on which the social network EVILEG is located. For projects on Django we recommend VDS hosting.

Do you like it? Share on social networks!

Comments

Only authorized users can post comments.
Please, Log in or Sign up
AD

C ++ - Test 004. Pointers, Arrays and Loops

  • Result:50points,
  • Rating points-4
m

C ++ - Test 004. Pointers, Arrays and Loops

  • Result:80points,
  • Rating points4
m

C ++ - Test 004. Pointers, Arrays and Loops

  • Result:20points,
  • Rating points-10
Last comments
i
innorwallNov. 11, 2024, 10:12 p.m.
Django - Tutorial 055. How to write auto populate field functionality Freckles because of several brand names retin a, atralin buy generic priligy
i
innorwallNov. 11, 2024, 6:23 p.m.
QML - Tutorial 035. Using enumerations in QML without C ++ priligy cvs 24 Together with antibiotics such as amphotericin B 10, griseofulvin 11 and streptomycin 12, chloramphenicol 9 is in the World Health Organisation s List of Essential Medici…
i
innorwallNov. 11, 2024, 3:50 p.m.
Qt/C++ - Lesson 052. Customization Qt Audio player in the style of AIMP It decreases stress, supports hormone balance, and regulates and increases blood flow to the reproductive organs buy priligy online safe Promising data were reported in a PDX model re…
i
innorwallNov. 11, 2024, 2:19 p.m.
Heap sorting algorithm The role of raloxifene in preventing breast cancer priligy precio
i
innorwallNov. 11, 2024, 1:55 p.m.
PyQt5 - Lesson 006. Work with QTableWidget buy priligy 60 mg 53 have been reported by Javanovic Santa et al
Now discuss on the forum
i
innorwallNov. 11, 2024, 8:56 p.m.
добавить qlineseries в функции buy priligy senior brother Chu He, whom he had known for many years
i
innorwallNov. 11, 2024, 10:55 a.m.
Всё ещё разбираюсь с кешем. priligy walgreens levitra dulcolax carbs The third ring was found to be made up of ultra relativistic electrons, which are also present in both the outer and inner rings
9
9AnonimOct. 25, 2024, 9:10 a.m.
Машина тьюринга // Начальное состояние 0 0, ,<,1 // Переход в состояние 1 при пустом символе 0,0,>,0 // Остаемся в состоянии 0, двигаясь вправо при встрече 0 0,1,>…

Follow us in social networks