[PyQt] Segfault when trying to rely on QStyledItemDelegate.setEditorData/ModelData default behavior

[Elvis Stansvik]

2016-02-12 12:14 GMT+01:00 Phil Thompson <phil at riverbankcomputing.com>:
> On 11 Feb 2016, at 8:53 pm, Elvis Stansvik <elvstone at gmail.com> wrote:
>>
>> 2016-02-11 21:14 GMT+01:00 Elvis Stansvik <elvstone at gmail.com>:
>>> I found the problem, I had forgot to change the user property from
>>> dict to QVariant (was testing around).
>>>
>>> With the property of type QVariant, it seems to work fine.
>>
>> I'm actually still interested in why I need to declare the Qt property
>> as QVariant here. Why do I get a segfault if I declare it as dict?
>>
>> That is, in the paste
>> https://gist.github.com/estan/c051d1f798c4c46caa7d , why must it be
>>
>>    @pyqtProperty(QVariant, user=True)
>>    def values(self):
>>        return self._values
>>
>> and not
>>
>>    @pyqtProperty(dict, user=True)
>>    def values(self):
>>        return self._values
>>
>> ?
>>
>> The value I store there (self._values) is a dict after all. Does it
>> have something to do with the way in which
>> QStyledItemDelegate::setEditorData sets the property?
>
> Yes. It passes the address of a QVariant. PyQt uses the type of the property to tell it what to do with the address.

Aha, I think I understand: QStyledItemDelegate::setEditorData wraps
the value in a QVariant, and then crashes when trying to set the
property, because QVariant can't be converted to dict..?

Elvis

>
> Phil