Qml + c++

niqt

Hi
i run with success this "http://doc.qt.nokia.com/4.7/qtbinding.html#calling-c-methods-from-qml":http://doc.qt.nokia.com/4.7/qtbinding.html#calling-c-methods-from-qml ,but when in run my application (my
c++ class inherits from QSqlRelationalTableModel within Q_INVOCABLE fake funciton), i have this error:

"Bar.qml:50 TypeError: Result of expressionon 'modelListItems.fake [undefined] is not a function"

what's wrong?

[edit: fixed link / chetankjain]

anselmolsm

Q_INVOKABLE, not Q_INVOCABLE
modelListItems.fake() , not modelListItems.fake

niqt

I have Q_INVOKABLE and modelListItems.fake() in my code.

anselmolsm

[quote author="nicola1" date="1285600625"]I have Q_INVOKABLE and modelListItems.fake() in my code.[/quote]

So, help us help you... more information needed.

niqt

main.qml
@
import Qt 4.7
import "content"

Rectangle {
width: 400
height: 240
function showListItems() {
list.visible= false;
listItems.visible = true;

    }
function newList() {
    modelListItems.clear();

    ;
}

List {
    id: list
}
ListItems {
    id: listItems
    visible: false
}
Bar {
    onClickItems: showListItems();
    onClickNewList: modelListItems.fake();
}

}
@

main.cpp
@
QDeclarativeContext *ctxt = view.rootContext();
ctxt->setContextProperty("modelListItems", &model);

view.setSource(QUrl::fromLocalFile&#40;"listview/Main.qml"&#41;;

@

My model.h
@
Q_INVOKABLE void fake() const;
@

My model.cpp
@
void Mymodel::fake() const
{

qDebug() << "FAKE " << endl;

}
@

[edit: highlight added / Denis Kormalev]

DenisKormalev

Is there Q_OBJECT define in Mymodel class declaration?

I see that you use object in stack, not in heap. Maybe object is out of scope and deleted because of it and so it is not accessible from Qml?

anselmolsm

[quote author="Denis Kormalev" date="1285604321"]Is there Q_OBJECT define in Mymodel class declaration?[/quote]

Denis is correct.

Q_INVOKABLE member functions are called via the meta-object system, so you must add Q_OBJECT in your class declaration, then moc can do its job =)

niqt

I added Q_OBJECT and now is working, Thanks. I should understand because i need Q_OBJECT when y class inherit from QSqlTableModel.

DenisKormalev

nicola1, Jus make it

@
class QLSqlTableModel : public QSqlRelationalTableModel
{
Q_OBJECT
QHash<int, QByteArray> roles;
public:
QLSqlTableModel(QObject *parent = 0);
QVariant data ( const QModelIndex & index, int role = Qt::DisplayRole ) const;
Q_INVOKABLE void fake() const;
};
@

anselmolsm

[quote author="nicola1" date="1285657479"]I added Q_OBJECT and now is working, Thanks. I should understand because i need Q_OBJECT when y class inherit from QSqlTableModel.

[/quote]

"http://doc.trolltech.com/4.7/qobject.html#Q_OBJECT":http://doc.trolltech.com/4.7/qobject.html#Q_OBJECT