Hi Preet,
On 10/07/2011, at 10:20 AM, ext Preet wrote:
> Hiya,
>
> I'm trying to create a nested ListView from a simple QList model in C++, of
> type QList<SomeType*>. The SomeType object can have children of its own type
> as well. So each SomeType object has a QList<SomeType*> in it. Starting with
> an 'outer list' of QList<SomeType*>s, I wanted to make a ListView in QML like
> this:
>
> SomeTypeA
> child1SomeTypeA
> child2SomeTypeA
> SomeTypeB
> child1SomeTypeB
> child2SomeTypeB
> child3SomeTypeB
> ... etc.
>
> I kept running into problems with my attempts to do this:
> * I get metatype errors when trying to convert QList<QObject*> into a
> QVariant to have it accessible to the QML engine with Q_INVOKABLE. This
> doesn't happen when I'm using setContextProperty in the same way... why is
> this?
> * I'm not sure how to get the current object from within the delegate, or
> even if I'm approaching this the right way.
>
A QList<QObject*> has no way of notifying the view when its contents have
changed. Instead you could use a QDeclarativeListProperty for the children.
E.g.
class SomeType : public QObject
{
Q_PROPERTY(QDeclarativeListProperty<QObject> children READ children
NOTIFY childrenChanged)
There are some examples of using QDeclarativeListProperty in the C++ extensions
tutorial:
http://doc.qt.nokia.com/4.7/declarative-tutorials-extending-chapter5-listproperties.html
The inner ListView can then use "children" as its model which will reference
the 'children' property of the current delegate object (although you might want
to use a name other than "children" to avoid confusion with ordinary child
items in QML).
regards,
Bea
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