[Qt-qml] Getting a list of strings from plugin

[jerome.pasion at nokia.com]

Hello,

You would need to use QDeclarativeListProperty aka "list properties". 
We have several documents on this already: 
1)http://doc.qt.nokia.com/4.7-snapshot/gettingstartedqml.html#creating-qml-properties-in-a-c-class
2)http://doc.qt.nokia.com/4.7-snapshot/declarative-tutorials-extending-chapter5-listproperties.html

To summarize:
1)Your list item must inherit from a QObject, so don't use QString.
2)You MUST create functions to append to your list. size(), at(), clear() functions aren't necessary.
3) Register the type into qml using qmlRegisterType() in C++.

Cheers,
Jerome P.
________________________________________
From: qt-qml-bounces at trolltech.com [qt-qml-bounces at trolltech.com] On Behalf Of ext Toni Leppänen [toni.leppanen at gmail.com]
Sent: Thursday, September 30, 2010 12:01 PM
To: qt-qml at trolltech.com
Subject: [Qt-qml] Getting a list of strings from plugin

I'm trying to return a list of strings from a plugin. I'm getting an
error when trying to access the list:
foo.qml:13: TypeError: Result of expression 'list' [undefined] is not an object.

Can someone help me how to do this? Here's a simplified example what I've tried:

foo.h
-----
#include <QObject>
#include <QString>
#include <QDebug>

class Foo : public QObject
{
  Q_OBJECT

  public:
    Foo(QObject * parent = 0);
    ~Foo();

    Q_INVOKABLE QList<QString> getList();
};


foo.cpp
-------
#include "foo.h"

Foo::Foo(QObject * parent) : QObject(parent) {}

Foo::~Foo() {}

QList<QString> Foo::getList()
{
    QList<QString> list;
    list << "aa" << "bb";

    return list;
}


foo.qml
-------
import Foo 1.0
import Qt 4.7

Item {
    property variant list: []

    Foo {
        id: plugin
    }

    Component.onCompleted: {
        list = plugin.getList();
        console.debug(list[0]);
        console.debug(list[1]);
    }
}

Cheers,
Toni
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