Reading value from ListView item, after changing it's model

krokstr

Hello,

I have a ListView which I want to fill with data from C++'s QStringList.

        ListView {
            id: config_list
            anchors.fill: parent
            model: config_model
            delegate: configDelegate
            clip: true
            highlightFollowsCurrentItem: true
            highlight: Rectangle {
                color: 'grey'
                radius: 5
            }
        }
ListModel{
        id:config_model
        ListElement{
            name: "D1"
        }
        ListElement{
            name: "P1"
        }
        ListElement{
            name: "W1"
        }
    }
    Component {
        id: configDelegate
        Item {
            width: parent.width
            height: 30
            Row{
                Text {
                    font.pixelSize: 20
                    verticalAlignment: Text.AlignBottom
                    horizontalAlignment: Text.AlignLeft
                    color: "white"
                    text: name
                }
            }
            MouseArea {
                anchors.fill: parent
                onClicked:{
                        config_list.currentIndex = index
                    console.log(qsTr(config_model.get(config_list.currentIndex).name))
                }
            }
        }
    }

So I do have the next in my .cpp file :

Q_PROPERTY(QStringList model MEMBER m_model NOTIFY modelChanged)

I'm filling the list with the data wanted and reading it from QML.

button{
        onClicked:{
            conf_page.config_model.clear()
            myClass.onReadModel()
            conf_page.config_list.model = myClass.model
        }
    }

But when the new model is loaded, the data doesn't show up until i change the value of configDelegate's text.
text: modelData,
instead of
text: name.

Now I can see the text in the ListView, but I can not read the data with current method i'm using (console.log(qsTr(config_model.get(config_list.currentIndex).name))).
I've tried different approaches, but couldn't manage to fix it.

How should I do it ?

Gojir4

@krokstr Hi,

get() is specific to QML type ListModel but doesn't exist in QStringListModel. So you cannot call it with a C++ model, except if you make your own model and implement the get method.

dheerendra

I felt some cleanup is required in your program. First you are creating the model in QML. You are creating the StringList and exposing it as model. QStringList is not a model. QStringListModel is model. I saw some data is fetched from C++ and trying to assign the model in QML. I'm not very clear why all this round about.

Either you can create the model in QML & stay with it. If not create the model in C++ and expose this model itself to QML using setContextProperty. You can directly assign C++ model to ListView. This will simplify your program.

krokstr

Okay, I'm fairly new to QML and I'm sorry if I'm asking stupid questions!
I've tried some new methods but, I can't understand you very well. I couldn't make it with changing to QStringListModel.
So, what is the best way to fill up the ListView from C++, preferably preserving the current ListModel with "name" parameter in it . I am using C++ for searching some files in a directory, put their names in QStringList, then I want to transfer the data to ListView in QML. Can you send me some snippet code and links to something that can help me?

Mammamia

Hi @krokstr , If you want to show files in a folder you can also try using QFileSystemModel and show the file names in the QML view.

Below is my blog post in which I create a custom FileSystemModel which fetch the directory information and show on a TreeeWidget.
https://arunpkqt.wordpress.com/2017/01/05/custom-filesystemmodel-display/

This is another example in which I use the same custom model to display the content in a QML TreeView.
https://github.com/arunpkqt/QMLTreeView

You can refer those two. Hope it helps. Happy coding!