Click on an element in GridView and invoke a function

[MoaMoaK]

Hi everyone,
I have a class (PLModel) subclassing QAbstractItemModel and passed to a QML GridView through the context. The display works fine. The problem is that i want to be able to click on one of those item and invoke a function that acts differently according to the element that has been clicked.
Here is the code i've come up with so far :

plmodel.hpp (simplified)

class PLModel : public QAbstractItemModel
{
public :
    // Constructor
    PLModel()

   // The functions to subclass QAbstractItemModel
   // index, parent, rowCount, columnCount, data, hasChildren, setData, flags, roleNames

   // The method I want to invoke
   Q_INVOKABLE virtual void activateItem( const QModelIndex &index ) Q_DECL_OVERRIDE;

    // Other irrelevant stuff
    ...
};

plmodel.cpp (simplified)

PLModel::PLModel() { }
// The imlementation of the functions to subclass QAbstractItemModel

// The method I want to invoke
void PLModel::activateItem( const QModelIndex &index )
{
    // For debug
    log_debug (index.row())
    log_debug (index.column())

    // Do some other stuff according to the selected item
    // item = getItem ( index )
    ...
}

ui.qml

import QtQuick 2.0

Item {
    width: 1000
    height: 1000

    GridView {
        id: gridView
        anchors.fill: parent
        cellWidth: 150
        cellHeight: 150
        model: m        // This variable comes from context (= instance of PLModel)
        delegate: Item {
            x: 5
            height: 50
            Image {
                anchors.horizontalCenter: parent.horizontalCenter
                id: image
                width: 100
                height: 100
                source: model.image
                MouseArea {
                    anchors.fill: image
                    onClicked: m.displayInfo(index)   // Where i call the function
                }
            }
        }

    }
}

Then when i click on an element, the function is called correctly but the 'index' is not correct : index.row = -1 & index.column = -1 (not matter which element i pick). Thus i can't decide what to do because i don't know which element was clicked. I don't understand why i get this index. Am i doing something wrong ? Is there another way to do what i want to do ?

Thx,
MoaMoaK

[sierdzio]

Please do not double-post. I'm closing this one.