Using QAbstractItemModel in Models that haven't any list.

[overlord]

I want to show instant datas like speed,coordinate etc. on ui that I designed with Qml and I want to use model class derived from QAbstractItemModel.

But as I understand it,QAbstractItemModel designed for class that have table,list ... elements.
How can I use it for my design?

[SGaist]

Hi,

From the looks of it, it seems you rather want a QObject based class with various Q_PROPERTY for the values you want to show.

In any case, you should give more details about the data source and what you plan to show.

[overlord]

There are datas from ethernet include sensor data and gps information. I want to show all sensor datas on a chart and actual gps information on some labels and a map.
Do you have any suggestion for this scenario?

[SGaist]

So you have a list with two columns:

• Sensor name
• Sensor value

Correct ?

[overlord]

No. I have a one sensor. I want to show all output on a chart,actual(last) gps info(speed,course,time,hdop,pdop etc. on labels and actual(last) coordinate on map. Previous GPS datas will not be stored.

[SGaist]

So you have some form of history you want to show ?

[overlord]

No,I haven't.

[SGaist]

I fail to see the use of chart for that then. Do you have a drawing of the UI you want to make ?

[overlord]

Actually I wonder that can I use QAbstractItemModel for model that generate instant data. So view of that model will show only actual instant data.
Can I use QAbstractListModel for this purpose.That model have only one row and I will update that row periodically because I want to show only one data at the same time.
Is this usage correct?

[SGaist]

You can use it that way. It likely overkill but you can do it.

[overlord]

Or, should I use model derived from QObject and define variable that accessed from qml with Q_PROPERTY.
I have never use qml for commercial project before.Therefore I am invastigating proper way to use model/view pattern.

[JKSH]

@overlord said in Using QAbstractItemModel in Models that haven't any list.:

I am invastigating proper way to use model/view pattern.

The model/view pattern in Qt is designed for cases where you have an arbitrary number of rows of data. Your sensors don't quite match this use-case. Therefore, the model/view pattern is not suitable for your sensors.

I suggest you choose the right tool for the job: Just use a data structure for your sensors, like @SGaist suggested.

If you want to investigate how to use the model/view pattern, try implementing a model with rows. For example, an address book.