PyQt6: Cannot create new custom QEvent

[Phil Thompson]

On 19/04/2021 14:15, Colin McPhail wrote:
> Hi,
> 
>> On 19 Apr 2021, at 13:18, Ales Erjavec <ales.erjavec324 at gmail.com> 
>> wrote:
>> 
>> Hi,
>> 
>> In PyQt6 this fails with a type error:
>> ```
>> from PyQt6.QtCore import QEvent
>> 
>> class CustomEvent(QEvent):
>>    EventType = QEvent.registerEventType()
>>    def __init__(self):
>>        super().__init__(CustomEvent.EventType)  # << Error Here
>> 
>> ev = CustomEvent()
>> ev.type()
>> ```
>> because the QEvent.__init__ arg must be QEvent.Type; in PyQt6 this is
>> an python enum and cannot represent 'undeclared' values).
>> 
> 
> I believe QEvent.registerEventType() returns an integer not a
> QEvent.Type instance. If you modify that line like:
>    EventType = QEvent.Type(QEvent.registerEventType())
> then I think it might be accepted.

That will work but only because the value corresponds to MaxUser (Qt 
allocates types from there working downwards). It won't work if you 
register a second type (ie. MaxUser - 1) which does not have a 
corresponding 'declared' value.

It will be fixed in the next snapshot.

Phil