QAbstractListModel methods from QML

[St.Stanislav]

Hello there!

I'm trying to find out a way to call QAbstractListModel methods from QML in the Delegate file. The aforementioned means that I can not use setContextProperty approach (I have model inside model and so on). I can not use model in Delegate's file cause it works with QQmlDMAbstractItemModelData and only with data(...) and setData(...) methods. So my question is: how to do that?

[Karim]

Hi @St-Stanislav

What exactly do you want to achieve ?
What methods do you want to call from QML ?

[St.Stanislav]

@Karim Well, I have several things that I need to implement. E.g., I need to emit signal in my QAbstractListModel, where argument is a parameter that is stored in the list item. All my items that are stored in the QAbstractListModel aren't QObjects, so I cannot use their signals and slots.

[Karim]

@St-Stanislav

Could you please post an example code-snippet of what you need to implement ?

[St.Stanislav]

@Karim I have tried to reduce unuseful information and code

struct DeviceParameter
{
	ParameterType m_type;
	QString m_name;
	QString m_comment;
	QVariant m_value;
	ParameterID m_parameterID;
	ParameterDisplayRole m_parameterDisplayRole;
}

class DeviceParametersList: public QAbstractListModel
{
....
       // All these methods are implemented
	virtual int rowCount(const QModelIndex& parent) const override; 
	virtual QVariant data(const QModelIndex& index, int role) const override;
	virtual bool setData(const QModelIndex& index, const QVariant& value, int role) override;
	virtual QHash<int, QByteArray> roleNames() const override;
signals:
       // This signals I want to emit from QML
	Q_INVOKABLE void readParameter(ParameterID parameterID) const;
	Q_INVOKABLE void writeParameter(ParameterID parameterID) const;

private:
	QList<DeviceParameter> m_parametersList;
};

So I display my DeviceParameter list in QML and have two buttons in the each delegate (read and write buttons). I want to call readParameter or writeParameter method with argument. This argument should be taken from the deletage's item, where read or write button was clicked.

[Karim]

@St-Stanislav

readParameters() and writeParameters(). Are they signals or methods ?
If they're signals, you'd better create a signal in QML, and connect it to the C++ side
It's explained here: Connecting to QML signals

If you plan to use ParameterID data type in QML side, don't forget to register it properly in the C++ side.

K.