Cannot find default delegate for property ""

[Lishen1]

QtnPropertyWidget* centralWidget;
QtnPropertySet* m_propertySet;
centralWidget = new QtnPropertyWidget();
m_propertySet = new QtnPropertySet(centralWidget);
layout()->addWidget(centralWidget);
centralWidget->setPropertySet(m_propertySet);
new QtnPropertyBool(m_propertySet); // this produce Cannot find default delegate for property "" Did you forget to register default delegate for  QtnPropertyBase type?

if i swap this lines

centralWidget->setPropertySet(m_propertySet);
new QtnPropertyBool(m_propertySet);

this problem is gone.

[lexxmark]

Yes, I can reproduce this.

It's because I'm adding property to property set in QtnPropertyBase constructor. At this time QtnPropertyBool object is not constructed yet so delegate factory looking delegate by QtnPropertyBase type.

In the second case delegate factory is working in the line

centralWidget->setPropertySet(m_propertySet);

and QtnPropertyBool object is fully constructed at this point.

There are two solutions there:

1. Forbid adding properties to property set in constructor. So the next line

   boolProperty = new QtnPropertyBool(m_propertySet);

   won't work and you will have to do explicit call:

   m_propertySet->addChildProperty(boolProperty);

2. Call qtnAddPropertyAsChild(parent, this, false); in each leaf property class constructor and throw some diagnostic if developer of the class did forget to call it.

Both solutions have caveats.

What do you think?

[Lishen1]

for the first case i get error C2512: 'QtnPropertyBool': no appropriate default constructor available this case didnt work too

    _prop = new T(_prop_set);
    _prop_set->addChildProperty(_prop);

[lexxmark]

I meant I should change QtnProperty code to have solution 1 or 2. Now it doesn't work. I know.

I'm refactoring code now and ping you when done.

[lexxmark]

I have made some changes in the code. Now "new T(_prop_set);" doesn't adds new property to _prop_set. you have to choices: 1.

    _prop = new T(_prop_set);
    _prop_set->addChildProperty(_prop);

2.

    qtnCreateProperty<T>(_prop_set [, "property name"]);

[Lishen1]

thank you, it works.