Use QQmlListProperty to show and modify QList in Qml - c++

Question

again, well i have a question (and maybe a problem), i make a program with qt and qml in qt5 and qml with qtquick 2.0, and i have a c++ model qlist, and i need modify the list in runtime, i use q QQmlListProperty and show the items in qml, but they are not hide and show in the moment when i add or remove my code is next:
class ConceptsList: public QObject{
Q_OBJECT
Q_PROPERTY(QQmlListProperty<Concept> concepts READ concepts NOTIFY conceptsChanged)
Q_CLASSINFO("DefaultProperty", "concepts")
public:
ConceptsList(QObject *parent=0);
QQmlListProperty<Concept> concepts();
Q_INVOKABLE static void append_concept(QQmlListProperty<Concept> *list, Concept *cpt);
Q_INVOKABLE void removeConcept(int index);
Q_INVOKABLE void addConcept(QString m_id,QString description, QString quantity, QString price, QString unit, QString total);
Q_INVOKABLE int countConcepts();
static void clearConcepts(QQmlListProperty<Concept> *property);
static int conceptsSize(QQmlListProperty<Concept> *property);
static Concept *conceptAt(QQmlListProperty<Concept> *property, int index);
signals:
void conceptsChanged();
private:
QList<Concept *> m_concepts;
}
I use a listview and delegate and i not have problems to view, but my question is if i can use a QQmlListProperty and modify the Qlist, or i will change a form to expose qlist to qml, if it's posible how call the method from qml, or how implement in C++, i ask because exists really little number or examples with work this form.
in qml my code is next:
ConceptsList{
id:cpts
concepts:[
Concept{
m_id:"7"
m_quantity: "3"
m_price: "1"
m_unit:"1"
m_description:"algo"
m_total:"2"
}
]
}
ListView {
id: listConceptsView
objectName: "list"
anchors.fill: parent
anchors.margins: 5
clip: true
focus: true
highlight: highlightBar
highlightFollowsCurrentItem: false
Component{
id: tableConceptDelegate
Item{
anchors.margins: 4
width: 515
height: 27
clip: true
Row {
spacing: 4
Text {
height: 26; width: 76
text: model.m_id
color: "black"
font.bold: true
horizontalAlignment: Text.AlignHCenter
}
...
...
Text {
height: 26; width: 120
text: model.m_total//amountTotal
color: "black"
font.bold: true
horizontalAlignment: Text.AlignHCenter
}
}
MouseArea {
id: mouse_area1
anchors.fill: parent
onClicked:
{
listConceptsView.currentIndex = index
}
}
}
}
delegate: tableConceptDelegate
model:cptCpt // i define this alias how cptCpt: cpt.concepts
}

Answer 1

I got the answer for my self, first, I stopped using the attribute Q_INVOCABLE in the method append_concept, second, I added a line of code in the implementation of addConcept. Here is the code:
Before:
Q_INVOKABLE static void append_concept(QQmlListProperty<Concept> *list, Concept *cpt);
Now:
static void append_concept(QQmlListProperty<Concept> *list, Concept *cpt);
Maybe this not affect, but i prefer not take risks.
And in the implementations of addConcept and removeConcept:
void ConceptsList::addConcept(QString m_id, QString quantity, QString price, QString unit, QString description)
{
Concept *cpt=new Concept(m_id, quantity, unit, price, description);
m_concepts.append(cpt);
this->conceptsChanged();
}
void ConceptsList::removeConcept(int index)
{
m_concepts.removeAt(index);
this->conceptsChanged();
}