Bug 95 – PySide fails if sizeHint() or minimumSizeHint() don't return anything

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Bug 95 - PySide fails if sizeHint() or minimumSizeHint() don't return anything

Summary:

PySide fails if sizeHint() or minimumSizeHint() don't return anything

Status:	CLOSED FIXED

Product:	PySide
Classification:	Unclassified
Component:	QtGui
Version:	0.2.1
Platform:	All All

Importance:	P5 normal
Assigned To:	renato filho

URL:

Depends on:
Blocks:
	Show dependency tree / graph

Reported:	2009-11-09 08:58 EET by Matti Airas
Modified:	2010-03-24 16:41 EET (History)
CC List:	5 users (show)

See Also:

Attachments
A test script illustrating the sizeHint error message (or lack thereof) (1014 bytes, application/octet-stream) 2009-11-09 08:58 EET, Matti Airas	Details
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Description Matti Airas 2009-11-09 08:58:22 EET

Created attachment 26 [details]
A test script illustrating the sizeHint error message (or lack thereof)

I tried to create a custom widget (by copy-pasting some old PyQt test code of
mine). Of course, that wouldn't work, and only after a few hours of debugging I
found the culprit. In PyQt, this works:

    def sizeHint(self):
        pass

In PySide, I get this error:

Traceback (most recent call last):
  File "./hintbug", line 42, in <module>
    form.show()
TypeError: No registered converter was able to produce a C++ rvalue of type
QSize from this Python object of type NoneType

While it's probably all right to not let sizeHint and minimumSizeHint return
illegal values, the error message I received contained no indication on the
location of the code where the problem occurred. Maybe the error messages could
be fixed in these cases?

I attached a pretty minimal test software illustrating the issue.

Comment 1 renato filho 2009-11-17 14:24:27 EET

based on this merge request
(http://qt.gitorious.org/pyside/boostpythongenerator/merge_requests/2117), now
when a virtual function implemented in python return a wrong type this raise a
exception more specific about the problem. In this example you can get some
like that:

Traceback (most recent call last):
  File "./hintbug.py", line 42, in <module>
    form.show()
TypeError: Invalid return value in function QWidget.sizeHint

Any comments??

Comment 2 renato filho 2009-11-24 18:14:55 EET

fixed on PySide release 0.2.2.